Climate Overview
The climate in Arenal Santa Ana is hot. The average annual temperature is 26°C and approximately 1975mm of precipitation falls per year. September is the wettest month, receiving around 359mm of rainfall. Arenal Santa Ana is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: May, April, June. The coldest months are January, February, December, when temperatures can drop to 18°C.
Temperature
Arenal Santa Ana sees moderate temperature variation throughout the year, ranging from 18°C to 35°C. May is the hottest month, with daytime highs reaching 35°C and an average of 30°C. January is the coolest month, with minimum temperatures around 18°C and an average of 22°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs. The sharpest temperature change occurs between February and March, with a 3°C shift in average temperatures.
Precipitation
Arenal Santa Ana is a fairly wet location, receiving approximately 1975mm of precipitation annually, which averages out to around 165mm per month. The wettest month is September, averaging 359mm of rainfall. August and July also tend to see above-average precipitation. The driest month is March, with just 28mm. That's 332mm less than September, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.
Wind
Arenal Santa Ana is relatively calm, with an average annual wind speed of 12km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 13km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 10km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 3km/h between the calmest and windiest months.
Seasons
89 days until Summer
It is currently spring in Arenal Santa Ana, which began on March 20, 2026. Arenal Santa Ana is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in May at around 35°C, while the coldest stretch bottoms out in January near 18°C. Summer is next, beginning on June 21, 2026 — 89 days from now.
Spring
Temperatures range from 21 to 35°C. Rainfall is relatively light, with around 145mm over the season and a monthly average of 48mm. Winds are generally light, averaging 13km/h. Light layers work well as temperatures warm through the season — a great time to be outdoors.
Summer
Temperatures range from 23 to 33°C. Rainfall is heavy, totalling around 962mm across the season with a monthly average of 321mm. Winds are generally light, averaging 11km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 20 to 32°C. Rainfall is heavy, totalling around 723mm across the season with a monthly average of 241mm. Winds are generally light, averaging 11km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 18 to 28°C. Rainfall is relatively light, with around 145mm over the season and a monthly average of 48mm. Winds are generally light, averaging 13km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Best Time to Visit
The best time to visit Arenal Santa Ana is during January, February and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 23°C with modest rainfall averaging 48mm per month. By contrast, May can be uncomfortably hot with temperatures reaching 35°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.
Monthly Climate Data
The table below shows monthly climate averages for Arenal Santa Ana based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.
