Climate Insights for San Juan

The climate in San Juan is warm and mild. The average annual temperature is 24°C and approximately 1,964 mm of precipitation falls per year. October is the wettest month, receiving around 363 mm of rainfall. San Juan is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: April, May, March. The coldest months are February, January, March, when temperatures can drop to 20°C.The climate in San Juan is warm and mild. The average annual temperature is 76°F and approximately 77.3 in of precipitation falls per year. October is the wettest month, receiving around 14.3 in of rainfall. San Juan is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: April, May, March. The coldest months are February, January, March, when temperatures can drop to 69°F.

San Juan has relatively stable temperatures year-round, staying within a 10°C range. The warmest month is April, when average highs reach 30°C and the mean temperature sits around 25°C. February is the coolest month, with minimum temperatures around 20°C and an average of 24°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows.San Juan has relatively stable temperatures year-round, staying within a 17°F range. The warmest month is April, when average highs reach 86°F and the mean temperature sits around 77°F. February is the coolest month, with minimum temperatures around 69°F and an average of 74°F. Daily temperature variation is modest, with an average difference of 12°F between highs and lows.

San Juan is a fairly wet location, receiving approximately 1,964 mm of precipitation annually, which averages out to around 164 mm per month. The wettest month is October, averaging 363 mm of rainfall. June and September also tend to see above-average precipitation. The driest month is February, with just 10 mm. That's 353 mm less than October, 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.San Juan is a fairly wet location, receiving approximately 77.3 in of precipitation annually, which averages out to around 6.5 in per month. The wettest month is October, averaging 14.3 in of rainfall. June and September also tend to see above-average precipitation. The driest month is February, with just 0.4 in. That's 13.9 in less than October, 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.

San Juan is relatively calm, with an average annual wind speed of 10km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 17km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 5km/h, making it an ideal period for wind-sensitive activities. Wind speeds vary significantly across the year, with a 12km/h difference between the calmest and windiest months. This level of variation is worth factoring into travel plans. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 15km/h in winter, 11km/h in spring, 7km/h in summer, 6km/h in autumn.San Juan is mildly breezy, with an average annual wind speed of 6mph. For context, sustained winds below 7mph are generally light, while anything above 16mph is considered strong. The windiest month is February, averaging 11mph, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in September, with average winds dropping to 3mph, making it an ideal period for wind-sensitive activities. Wind speeds vary significantly across the year, with a 8mph difference between the calmest and windiest months. This level of variation is worth factoring into travel plans. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 9mph in winter, 7mph in spring, 5mph in summer, 4mph in autumn.

The best time to visit San Juan is during January, February, March and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 24°C with modest rainfall averaging 28 mm per month. By contrast, April can be uncomfortably hot with temperatures reaching 30°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.The best time to visit San Juan is during January, February, March and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 75°F with modest rainfall averaging 1.1 in per month. By contrast, April can be uncomfortably hot with temperatures reaching 86°F. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for San Juan 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.The table below shows monthly climate averages for San Juan based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Fahrenheit (°F). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in miles per hour (mph). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.