Climate Overview
The climate in San Juan Airport is temperate. The average annual temperature is 17°C and approximately 161mm of precipitation falls per year. July is the wettest month, receiving around 21mm 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 has relatively stable temperatures year-round, staying within a 10°C range. February is the warmest month, though highs remain moderate at 23°C with a mean of 21°C. August is the coolest month, with minimum temperatures around 13°C and an average of 14°C. Daily temperature variation is modest, with an average difference of 2°C between highs and lows.
Precipitation
San Juan Airport is a quite dry location, receiving approximately 161mm of precipitation annually, which averages out to around 13mm per month. The wettest month is July, averaging 21mm of rainfall. August and September also tend to see above-average precipitation. The driest month is March, with just 5mm. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall.
Wind
San Juan Airport is moderately windy, with an average annual wind speed of 22km/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 24km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in February, with average winds dropping to 20km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 4km/h between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 24km/h in winter, 23km/h in spring, 20km/h in summer, 21km/h in autumn.
Seasons
89 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 23°C, while the coldest stretch bottoms out in August near 13°C. Winter is next, beginning on June 21, 2026 — 89 days from now.
Spring
Temperatures range from 14 to 18°C. Precipitation is minimal, with only around 41mm for the entire season. Winds are moderate at around 23km/h. Light layers work well as temperatures warm through the season — a great time to be outdoors.
Summer
Temperatures range from 17 to 23°C. Precipitation is minimal, with only around 38mm for the entire season. Winds are moderate at around 20km/h. Comfortable clothing with a light layer for cooler evenings is all you need.
Autumn
Temperatures range from 16 to 22°C. Precipitation is minimal, with only around 26mm for the entire season. Winds are moderate at around 21km/h. Layered clothing works best as temperatures gradually cool — enjoy the crisp air and changing scenery.
Winter
Temperatures range from 13 to 17°C. Rainfall is relatively light, with around 56mm over the season and a monthly average of 19mm. Winds are moderate at around 24km/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, 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 12mm 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.
