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Opatija 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Opatija

Croatia

Long range weather outlook for Opatija includes 14 day forecast summary:

Taking a look at Opatija over the coming two weeks and the average daytime maximum temperature will be around 26°C, with a high for the two weeks of 31°C expected on the afternoon of Monday 15th. The mean minimum temperature will be 13°C, dipping to its lowest on the morning of Saturday 20th at 9°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. The current forecast indicates Wednesday 10th will have the most precipitation with an accumulation of around 66.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Wed 10
Sep		19:00

WSW
WSW

 5 / 8 mph 74 / 76°F 97% 1007 mb
Low level cloud: 53%
Mid level cloud: 44%
High level cloud: 16%
Most Significant Cloud Type: low
69%
Expect 0.6 In of precipitation over the past 3 hours.
0.6 In
22:00

W
W

 3 / 4 mph 70 / 70°F 95% 1009 mb
Low level cloud: 50%
Mid level cloud: 19%
High level cloud: 1%
Most Significant Cloud Type: low
57%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Thu 11
Sep		01:00

SE
SE

 1 / 1 mph 62 / 62°F 96% 1010 mb
Low level cloud: 82%
Mid level cloud: 46%
High level cloud: 2%
Most Significant Cloud Type: low
97%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
04:00

ESE
ESE

 3 / 4 mph 64 / 64°F 95% 1010 mb
Low level cloud: 74%
Mid level cloud: 20%
High level cloud: 4%
Most Significant Cloud Type: low
81%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
07:00

E
E

 4 / 5 mph 69 / 67°F 92% 1012 mb
Low level cloud: 53%
Mid level cloud: 18%
High level cloud: 10%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SE
SE

 5 / 6 mph 76 / 77°F 81% 1013 mb
Low level cloud: 37%
Mid level cloud: 13%
High level cloud: 12%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSE
SSE

 5 / 6 mph 77 / 78°F 78% 1014 mb
Low level cloud: 25%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

 6 / 8 mph 76 / 78°F 76% 1014 mb
Low level cloud: 35%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ENE
ENE

 2 / 4 mph 64 / 62°F 88% 1016 mb
Low level cloud: 3%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNE
NNE

 4 / 9 mph 59 / 59°F 87% 1017 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 12
Sep		01:00

NNE
NNE

 4 / 9 mph 56 / 56°F 85% 1017 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNE
NNE

 5 / 10 mph 55 / 54°F 84% 1017 mb
Low level cloud: 5%
Mid level cloud: 24%
High level cloud: 9%
Most Significant Cloud Type: medium
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

 4 / 9 mph 62 / 60°F 79% 1017 mb
Low level cloud: 3%
Mid level cloud: 46%
High level cloud: 14%
Most Significant Cloud Type: medium
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

 0 / 0 mph 81 / 81°F 68% 1018 mb
Low level cloud: 7%
Mid level cloud: 47%
High level cloud: 0%
Most Significant Cloud Type: medium
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

 3 / 4 mph 83 / 83°F 68% 1018 mb
Low level cloud: 5%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

S
S

 2 / 3 mph 81 / 81°F 70% 1018 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 1%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNE
NNE

 3 / 7 mph 62 / 60°F 84% 1019 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 79%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNE
NNE

 5 / 11 mph 59 / 58°F 83% 1020 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 100%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 13
Sep		01:00

N
N

 5 / 11 mph 58 / 57°F 82% 1019 mb
Low level cloud: 1%
Mid level cloud: 38%
High level cloud: 80%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNE
NNE

 5 / 11 mph 57 / 57°F 84% 1019 mb
Low level cloud: 3%
Mid level cloud: 32%
High level cloud: 32%
Most Significant Cloud Type: medium
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

 5 / 11 mph 62 / 60°F 83% 1019 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 1%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

E
E

 4 / 4 mph 81 / 82°F 68% 1019 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 4%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

 4 / 4 mph 83 / 84°F 64% 1018 mb
Low level cloud: 1%
Mid level cloud: 23%
High level cloud: 6%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

S
S

 3 / 3 mph 80 / 80°F 71% 1017 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 40%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NE
NE

 2 / 4 mph 63 / 61°F 85% 1018 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 42%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NE
NE

 2 / 4 mph 59 / 59°F 83% 1018 mb
Low level cloud: 0%
Mid level cloud: 49%
High level cloud: 37%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 14
Sep		01:00

NE
NE

 2 / 4 mph 60 / 60°F 85% 1017 mb
Low level cloud: 1%
Mid level cloud: 72%
High level cloud: 96%
Most Significant Cloud Type: medium
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NE
NE

 3 / 6 mph 61 / 61°F 91% 1016 mb
Low level cloud: 43%
Mid level cloud: 87%
High level cloud: 19%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

N
N

 2 / 4 mph 64 / 62°F 89% 1017 mb
Low level cloud: 26%
Mid level cloud: 43%
High level cloud: 21%
Most Significant Cloud Type: low
43%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
10:00

NNE
NNE

 8 / 16 mph 64 / 63°F 86% 1020 mb
Low level cloud: 7%
Mid level cloud: 33%
High level cloud: 18%
Most Significant Cloud Type: medium
54%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
13:00

E
E

 8 / 12 mph 74 / 76°F 57% 1020 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
16:00

E
E

 6 / 7 mph 74 / 76°F 55% 1021 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 5%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NE
NE

 6 / 12 mph 58 / 56°F 76% 1022 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNE
NNE

 6 / 14 mph 54 / 52°F 74% 1023 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 15
Sep		01:00

NNE
NNE

 6 / 13 mph 52 / 50°F 68% 1023 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 9%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNE
NNE

 6 / 13 mph 50 / 47°F 67% 1022 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 4%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

 6 / 12 mph 54 / 51°F 66% 1021 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 19%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNE
NNE

 2 / 2 mph 83 / 81°F 48% 1021 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 1 / 1 mph 88 / 86°F 41% 1019 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

 2 / 2 mph 85 / 84°F 51% 1018 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

N
N

 3 / 7 mph 62 / 60°F 72% 1019 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 12%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

N
N

 5 / 10 mph 58 / 57°F 73% 1019 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 16
Sep		01:00

N
N

 5 / 11 mph 56 / 55°F 72% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

 4 / 9 mph 54 / 53°F 71% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

 3 / 7 mph 57 / 56°F 69% 1018 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 33%
Most Significant Cloud Type: high
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

 2 / 2 mph 84 / 83°F 50% 1017 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

S
S

 3 / 3 mph 84 / 83°F 49% 1017 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 88%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

S
S

 1 / 1 mph 77 / 78°F 66% 1016 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNE
NNE

 3 / 6 mph 58 / 58°F 73% 1016 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

N
N

 4 / 8 mph 55 / 54°F 74% 1017 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 12%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Wed 17
Sep		01:00

N
N

 5 / 10 mph 63 / 63°F 65% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

NE
NE

 5 / 10 mph 65 / 65°F 93% 1016 mb
Low level cloud: 93%
Mid level cloud: 74%
High level cloud: 8%
Most Significant Cloud Type: low
100%
0.0 In
13:00

S
S

 4 / 9 mph 80 / 81°F 56% 1014 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
19:00

N
N

 5 / 10 mph 54 / 53°F 72% 1019 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
Thu 18
Sep		01:00

ENE
ENE

 9 / 20 mph 57 / 55°F 85% 1016 mb
Low level cloud: 1%
Mid level cloud: 71%
High level cloud: 5%
Most Significant Cloud Type: medium
74%
0.0 In
07:00

N
N

 2 / 5 mph 62 / 62°F 71% 1020 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
13:00

SE
SE

 3 / 6 mph 68 / 68°F 96% 1014 mb
Low level cloud: 98%
Mid level cloud: 66%
High level cloud: 6%
Most Significant Cloud Type: low
100%
0.0 In
19:00

NNE
NNE

 9 / 20 mph 62 / 62°F 87% 1019 mb
Low level cloud: 79%
Mid level cloud: 46%
High level cloud: 91%
Most Significant Cloud Type: low
100%
0.0 In
Fri 19
Sep		01:00

ENE
ENE

 9 / 19 mph 55 / 52°F 84% 1012 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: medium
47%
0.0 In
07:00

NNE
NNE

 8 / 16 mph 54 / 51°F 83% 1019 mb
Low level cloud: 23%
Mid level cloud: 48%
High level cloud: 11%
Most Significant Cloud Type: low
41%
0.1 In
13:00

SW
SW

 2 / 5 mph 72 / 76°F 46% 1016 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
0.0 In
19:00

NNE
NNE

 6 / 12 mph 58 / 57°F 83% 1020 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 11%
Most Significant Cloud Type: medium
12%
0.0 In
Sat 20
Sep		01:00

NNE
NNE

 3 / 7 mph 54 / 54°F 72% 1020 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 4%
Most Significant Cloud Type: medium
2%
0.0 In
07:00

NNE
NNE

 5 / 11 mph 56 / 55°F 75% 1022 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
13:00

SSW
SSW

 3 / 6 mph 79 / 81°F 54% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

N
N

 4 / 8 mph 64 / 64°F 81% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sun 21
Sep		01:00

NNE
NNE

 2 / 5 mph 56 / 57°F 79% 1016 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 2%
Most Significant Cloud Type: medium
5%
0.0 In
07:00

NNE
NNE

 3 / 6 mph 62 / 62°F 68% 1020 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

SSE
SSE

 4 / 8 mph 76 / 79°F 71% 1013 mb
Low level cloud: 1%
Mid level cloud: 46%
High level cloud: 9%
Most Significant Cloud Type: medium
50%
0.0 In
19:00

N
N

 3 / 6 mph 64 / 64°F 82% 1019 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
Mon 22
Sep		01:00

NNE
NNE

 5 / 11 mph 59 / 58°F 87% 1013 mb
Low level cloud: 0%
Mid level cloud: 93%
High level cloud: 28%
Most Significant Cloud Type: medium
93%
0.2 In
07:00

N
N

 5 / 11 mph 60 / 60°F 69% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

ENE
ENE

 11 / 22 mph 68 / 68°F 67% 1014 mb
Low level cloud: 0%
Mid level cloud: 42%
High level cloud: 100%
Most Significant Cloud Type: medium
46%
0.0 In
19:00

N
N

 5 / 11 mph 65 / 65°F 76% 1017 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Tue 23
Sep		01:00

NE
NE

 10 / 20 mph 56 / 54°F 88% 1017 mb
Low level cloud: 57%
Mid level cloud: 45%
High level cloud: 92%
Most Significant Cloud Type: low
83%
0.1 In
07:00

N
N

 5 / 11 mph 62 / 62°F 72% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

NNE
NNE

 8 / 17 mph 62 / 62°F 87% 1018 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
44%
0.2 In
19:00

NNE
NNE

 4 / 8 mph 68 / 68°F 75% 1017 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
Wed 24
Sep		01:00

E
E

 3 / 6 mph 60 / 60°F 91% 1019 mb
Low level cloud: 18%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
33%
0.7 In
07:00

NNE
NNE

 3 / 7 mph 65 / 65°F 70% 1015 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 19%
Most Significant Cloud Type: medium
2%
0.0 In
13:00

WSW
WSW

 3 / 6 mph 75 / 78°F 66% 1019 mb
Low level cloud: 30%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
35%
0.0 In
19:00

E
E

 1 / 2 mph 67 / 67°F 79% 1013 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 7%
Most Significant Cloud Type: medium
5%
0.0 In
Thu 25
Sep		01:00

N
N

 3 / 7 mph 53 / 53°F 86% 1018 mb
Low level cloud: 5%
Mid level cloud: 19%
High level cloud: 34%
Most Significant Cloud Type: medium
34%
0.0 In
07:00

SE
SE

 3 / 6 mph 61 / 61°F 91% 1010 mb
Low level cloud: 5%
Mid level cloud: 59%
High level cloud: 5%
Most Significant Cloud Type: medium
71%
0.1 In
13:00

SE
SE

 2 / 4 mph 78 / 80°F 56% 1016 mb
Low level cloud: 0%
Mid level cloud: 41%
High level cloud: 0%
Most Significant Cloud Type: medium
41%
0.0 In
19:00

N
N

 0 / 0 mph 61 / 61°F 92% 1009 mb
Low level cloud: 2%
Mid level cloud: 43%
High level cloud: 96%
Most Significant Cloud Type: medium
52%
0.3 In

Other Locations Near to Opatija

The day label given represents the local day relative to the local time for the location you are looking at.
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Day

This time is corrected for local time zones and where possible for daylight saving times.
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Local Time

The wind direction we use on this page is the direction the wind is coming from, given in a 16 point compass format.
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Dir

This refers to the sustained average wind speed, normally averaged over a period of 10 minutes for up to 3 hrs.
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Speed/
Gust

Temperature from our forecast perspective are fairly well defined, they are what we would expect to measure in a standard meteorological screen (in other words, shaded and well ventilated) at 2 metres above ground level.
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Temp/
Feels Like

The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
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Humidity

The value given is a total predicted for the previous 3 hrs and includes the time of the forecast being looked at.
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Precip Amount

The total amount of cloud as a percentage is derived from looking at cloud cover throughout the atmosphere and estimating how these combine when looked at from the ground.
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Cloud Amount

Here we try to capture the feel of the weather as an image – it will never be perfect but is useful for a quick overview.
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Weather

When we measure for forecast air pressure we are normally doing this relative to a certain height and most commonly relative to Mean Sea Level.
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Pressure