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 SEPTEMBER
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 Tibas.
Throughout the month of September daytime temperatures will generally reach highs of around 26°C that's about 80°F. At night the average minimum temperature drops down to around 20°C, that's 68°F.
In recent times the highest recorded temperature in September has been 33°C that's 91°F, with the lowest recorded temperature 16°C, about 61°F.
The average daily relative humidity for September is around 74%.
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 generally you should not anticipate any discomfort from heat (see heat index for more information).
The average daily wind speed in September has been around 12 km/h, that’s the equivalent to about 8 mph, or 7 knots. In recent years the maximum sustained wind speed has reached 37 km/h, that’s the equivalent of around 23 mph, or 20 knots.
On average the month of September is affected by foggy conditions on 8 days.
YEARLY TRENDS: WEATHER AVERAGES & EXTREMES
The following charts show yearly weather trends with information on monthly weather averages and extremes.
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.
The chart below plots the average number of days in any month that you can expect to see rain falling.
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.