The climate in San Juan during September can be summarized as hot, humid and wet.
September is in the fall / autumn in San Juan and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a steamy 30°C (87°F), whilst at night 23°C (74°F) is normal.
|Daytime temperature||30.4°C 86.7°F|
|Nightly temperature||23.4°C 74.1°F|
|Average temperature||26.9°C 80.4°F|
|Daily sunshine||8.3 hrs|
|Avg rainfall||188 mm 7.4 ins|
|Rainy days||18 days|
|Sea temperature||29°C 84.2°F|
|Windspeed||14.4kph 9 mph|
On average September is the 2nd wettest month of the year in San Juan with around 188mm 7.4 inches of rain making it a wet time to visit. This rainfall is typically spread over 18 days, although this may vary considerably.
On the flip side this corresponds to an average of 8.3 hours of sunshine per day.
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in San Juan in September 2022.
|Hottest month:||August||30.2°C 86.4°F|
|Driest month:||March||79mm 3.1ins|
|Coldest month:||February||26.9°C 80.4°F|
|Wettest month:||August||195mm 7.7ins|