San Juan Weather in September

What's the weather like in San Juan (San Juan) in September 2022?

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.

San Juan weather averages (imperial / metric)
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
Humidity 77%
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.

September temperatures in San Juan

San Juan average temperature in September

September rainfall

San Juan average rain in September

September hourly sunshine

San Juan average rain in September

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.

Other monthly averages

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San Juan weather stats

San Juan weather statistics
Hottest month: August 30.2°C 86.4°F
Driest month: March 79mm 3.1ins
Sunniest month: March 9.6hrs
Coldest month: February 26.9°C 80.4°F
Wettest month: August 195mm 7.7ins
Map showing location of San Juan (18.46633, -66.10572)

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