Climate Overview
The climate in San Juan Airport is warm and mild. The average annual temperature is 18°C and approximately 88mm of precipitation falls per year. January is the wettest month, receiving around 23mm of rainfall. San Juan Airport is in the Southern Hemisphere. The seasons are reversed — summer runs from December to February, while winter falls between June and August. The summer months are: February, March, January. The coldest months are August, September, July, when temperatures can drop to 13°C.
Temperature
San Juan Airport sees moderate temperature variation throughout the year, ranging from 13°C to 25°C. The warmest month is February, when average highs reach 25°C and the mean temperature sits around 22°C. August is the coolest month, with minimum temperatures around 13°C and an average of 15°C. Daily temperature variation is modest, with an average difference of 6°C between highs and lows.
Precipitation
San Juan Airport is a quite dry location, receiving approximately 88mm of precipitation annually, which averages out to around 7mm per month. The wettest month is January, averaging 23mm of rainfall. February and July also tend to see above-average precipitation. The driest month is November, with just 3mm. 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
San Juan Airport is relatively calm, with an average annual wind speed of 4km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is September, averaging 4km/h, though still comfortable for most outdoor activities. The calmest conditions occur in January, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 1km/h between the calmest and windiest months.
Seasons
3 days until Winter
It is currently autumn in San Juan Airport, which began on March 20, 2026. San Juan Airport is in the Southern Hemisphere, where the seasons are reversed — spring starts in September, summer in December, autumn in March, and winter in June. The warmest period peaks in February at around 25°C, while the coldest stretch bottoms out in August near 13°C. Winter is next, beginning on June 21, 2026 — 3 days from now.
Spring
Temperatures range from 13 to 21°C. Precipitation is minimal, with only around 10mm for the entire season. Winds are generally light, averaging 4km/h. Light layers work well as temperatures warm through the season — a great time to be outdoors.
Summer
Temperatures range from 17 to 25°C. Rainfall is relatively light, with around 47mm over the season and a monthly average of 16mm. Winds are generally light, averaging 3km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 15 to 25°C. Precipitation is minimal, with only around 13mm for the entire season. Winds are generally light, averaging 4km/h. Layered clothing works best as temperatures gradually cool — enjoy the crisp air and changing scenery.
Winter
Temperatures range from 13 to 19°C. Precipitation is minimal, with only around 18mm for the entire season. Winds are generally light, averaging 4km/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 San Juan Airport is during January, February, March, April, May, June, July, September, October, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 8mm per month. By contrast, August can be quite cold with temperatures dropping to 13°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.
Monthly Climate Data
The table below shows monthly climate averages for San Juan Airport 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.
