Country Overview For Costa Rica
The climate in Costa Rica is typically tropical and subtropical; dry season (December to April); rainy season (May to November); cooler in highlands. The terrain: coastal plains separated by rugged mountains including over 100 volcanic cones, of which several are major volcanoes. For San Jose in January the daily average maximum temperatures is 25°C with the average minimum 20°C, while in June the average maximum is 27°C with a minimum of 21°C. The wettest month for San Jose is January with an average of 0.0mm of precipitation falling while the driest month is January with 0.0mm falling.
HISTORICAL MONTHLY AVERAGES FOR MAY
The information presented below gives detailed historical monthly average weather conditions along with exceptional weather occurrences. To maintain relevance to current weather trends the displayed information has been calculated using data collected over the past two decades. The climate profile is taken from closest available data source to Dominical.
Temperature
Throughout the month of May daytime temperatures will generally reach highs of around 27°C that's about 81°F. At night the average minimum temperature drops down to around 21°C, that's 70°F.
In recent times the highest recorded temperature in May has been 35°C that's 95°F, with the lowest recorded temperature 17°C, about 63°F.
Relative Humidity
The average daily relative humidity for May is around 70%.
Heat Index
The Heat Index is a measure of how hot it feels when relative humidity is added to actual air temperature. From this a comfort level is calculated providing categories on how heat conditions might adversely affect someone.
Comfort Levels: Given average maximum temperatures and humidity levels caution is advised. Fatigue is possible with prolonged exposure and/or physical activity for those in high risk groups of possible heat disorders (see heat index for more information).
Wind
The average daily wind speed in May has been around 16 km/h, that’s the equivalent to about 10 mph, or 9 knots. In recent years the maximum sustained wind speed has reached 43 km/h, that’s the equivalent of around 26 mph, or 23 knots.
Fog
On average the month of May is affected by foggy conditions on 4 days.
YEARLY TRENDS: WEATHER AVERAGES & EXTREMES
The following charts show yearly weather trends with information on monthly weather averages and extremes.
Temperature
The chart below plots the average high and low temperature for each month of the year. It also shows the maximum and minimum recorded temperatures.
Rain days
The chart below plots the average number of days in any month that you can expect to see rain falling.
Wind Speed
The chart below plots the average daily wind speed you can expect for any month. It also shows the maximum recorded sustained wind speed for each month.