MARINE WEATHER

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Marine Weather

Marine weather for Jamestown

Lat: -15.91667, Lon: -5.71667

St. Helena Island, Global Ports

DATE WIND WAVES SWELL WEATHER TEMPERATURE  
Date Local Time Dir Speed Gust Hsig Ht. Dir Height Period Icon Air Feels Like Cloud Precip RH Pressure Vis
Units =>degktsktsmdegmsecs °F°F%In%mbmiles
Thu 23
May
03:00

133°

15191.5

160°

1.412.1737700.07110176
 06:00

132°

14181.5

160°

1.311.9727600.06810176
 09:00

127°

14171.4

150°

1.311.6757800.06310186
 12:00

129°

12141.9

250°

1.411.4798130.06410186
 15:00

143°

11151.3

150°

1.111.2808300.06510166
 18:00

143°

13191.3

160°

1.111.0798100.06310176
 21:00

138°

16211.4

160°

1.210.87679880.06210186
Fri 24
May
00:00

135°

16211.5

160°

1.210.77477550.06210176
 03:00

141°

16201.5

160°

1.210.57377360.06910176
 06:00

124°

17221.5

160°

1.310.4727600.06610176
 09:00

112°

16191.5

150°

1.210.2747830.06810186
 12:00

112°

15201.4

150°

1.110.27780160.06910186
 15:00

122°

15171.3

150°

1.010.2798200.06810166
 18:00

137°

14181.5

160°

1.310.2778000.06910166
 21:00

138°

15191.5

160°

1.310.1757800.06710186

Other Marine Near to Jamestown

The 7 day weather forecast summary for Jamestown, St. Helena Island, Global Ports:

Taking a look at the forecast over the coming week and the average daytime maximum will be around 26°C, with a high of 28°C expected on Saturday morning. The average minimum temperature for the week ahead will be around 22°C, dipping to its lowest on Wednesday morning at 21°C. Sunday is expected to see the most precipitation with around 2mm, or about 0.1inches anticipated. The strongest wind will be felt on Thursday morning, coming from the southeast, and reaching around 22mph, that's about 36km/h.

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