San Juan weather in September 2024

Expect 30°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in San Juan in September. Check more long-term weather averages for San Juan in September before you book your next holiday to Puerto Rico in 2024/2025.

30
30°C max day temperature
8
8 hours of sunshine per day
18
18 days with some rainfall
23
23°C min night temperature
12
12 hours of daylight per day
H
High heat & humidity
188
188 mm of monthly rainfall
11
11+ (Extreme) UV index
29
29°C sea temperature

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The September weather guide for Puerto Rico (San Juan) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm) | Imperial (°F / inches)

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How hot is it in San Juan in September?

Daytime temperatures usually reach 30°C in San Juan in September with high heat and humidity, falling to 23°C at night.

How sunny is it in San Juan in September?

There are normally 8 hours of bright sunshine each day in San Juan in September - that's 64% of daylight hours.

How warm is the sea around San Juan in September?

The average sea temperature around San Juan in September is 29°C.

Does it rain in San Juan in September?

There are usually 18 days with some rain in San Juan in September and the average monthly rainfall is 188mm.

What is the chance of a hurricane in San Juan in September?

On average 1.1 days in September in San Juan are likely to be affected by the passage of one or more tropical storms.

San Juan September sunrise & sunset times

Browse the sunrise and sunset times for San Juan in September 2024. Select a month to view San Juan sunrise and sunset times for the next 12 months.