Annual average weather for Guanacaste Region, Costa Rica

Annual Temperature for Guanacaste Region

The hottest month in Guanacaste Region is April when the average maximum temperature is 35°, average temperature is 29° and average minimum temperature is 24°.

The coolest month in Guanacaste Region is December when the average maximum temperature is 32°, average temperature is 27° and average minimum temperature is 22°.

Annual Sunshine for Guanacaste Region

The longest days in Guanacaste Region are in June, with an average of 12.7 hours of daylight per day. December has the shortest days with an average of 11.5 hours of daylight per day.

The sunniest days in Guanacaste Region are in February which has the most hours of sunshine per day with an average of 8.9 hours of sunshine per day, making it a sunny month with few clouds. October has the least sunshine with an average of 5 hours of sunshine per day, making it a sunny month that is overcast at times.

The ultraviolet index is the highest in April when it reaches 14.9 and lowest in December when it reaches 10.4.

An ultraviolet index reading above 11 indicates an extreme risk of harm from unprotected sun exposure. Unprotected skin risks burning in less than 10 minutes. Take all precautions because unprotected skin and eyes can burn in minutes. Tanning will be safest before 10am and after 4pm but only with a good application of sun screen. For those with sensitive skin stay in the shade and wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 30+ sunscreen every 2 hours, even on cloudy days. Watch out for relections from water that may increase ultraviolet exposure.

Annual Sea Temperature for Guanacaste Region

The warmest sea water temperatures in Guanacaste Region are found in March when they peak at 29° and lowest in September when they dip to 24°.

The sea is best for swimming between December and July when the temperature is above 27° which is very warm and ideal for relaxing and swimming for the whole day.

Annual Rainfall for Guanacaste Region

The wettest month in Guanacaste Region is October with 24.9cm of rain and the most days of rain with 20.1 days with some rain, a very wet time to visit the beach.

The driest month in Guanacaste Region is January with 0.3cm of rain and March has the fewest days of rain with 0.1 days with some rain, an extremely dry time to visit the beach.

Annual Humidity for Guanacaste Region

The most humid month in Guanacaste Region is September with a dew point (an indicator of humidity) of 25° which is very uncomfortable and fairly oppressive unless you are on a beach. At night you would most likely require airconditioning.

The least humid month in Guanacaste Region is February with a dew point of 19° which is somewhat uncomfortable for most people in cities but fine on a beach.

Annual Wind Speed for Guanacaste Region

The most windy month in Guanacaste Region is February when the average maximum windspeed is 35kmh and the average wind speed is 20kmh.

The least windy month in Guanacaste Region is October when the average maximum windspeed is 17kmh and the average wind speed is 7kmh.

Monthly Averages

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