Rio San Juan weather in September 2025

Q: How hot is it in Rio San Juan in September?

Daytime temperatures usually reach 32°C in Rio San Juan in September with high heat and humidity, falling to 22°C at night.

Q: How sunny is it in Rio San Juan in September?

There are normally 7 hours of bright sunshine each day in Rio San Juan in September - that's 58% of daylight hours.

Q: How warm is the sea around Rio San Juan in September?

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

Q: Does it rain in Rio San Juan in September?

There are usually 15 days with some rain in Rio San Juan in September and the average monthly rainfall is 131mm.

Q: What is the chance of a cyclone in Rio San Juan in September?

On average 1 day in September in Rio San Juan is likely to be affected by the passage of one or more tropical storms.

Expect 32°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Rio San Juan in September. Check more long-term weather averages for Rio San Juan in September before you book your next holiday to Dominican Republic in 2025/2026.

32
32°C max day temperature
7
7 hours of sunshine per day
15
15 days with some rainfall
22
22°C min night temperature
12
12 hours of daylight per day
H
High heat & humidity
131
131 mm of monthly rainfall
11
11 (Extreme) UV index
29
29°C sea temperature

More about the Rio San Juan

Rio San Juan by month

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The September weather guide for Dominican Republic (Rio 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)

More about the Dominican Republic

How hot is it in Rio San Juan in September?

Daytime temperatures usually reach 32°C in Rio San Juan in September with high heat and humidity, falling to 22°C at night.

How sunny is it in Rio San Juan in September?

There are normally 7 hours of bright sunshine each day in Rio San Juan in September - that's 58% of daylight hours.

How warm is the sea around Rio San Juan in September?

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

Does it rain in Rio San Juan in September?

There are usually 15 days with some rain in Rio San Juan in September and the average monthly rainfall is 131mm.

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

On average 1 day in September in Rio San Juan is likely to be affected by the passage of one or more tropical storms.

Rio San Juan September sunrise & sunset times

Browse the sunrise and sunset times for Rio San Juan in September 2025. Select a month to view Rio San Juan sunrise and sunset times for the next 12 months.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Date	Sunrise times	Sunset times
Monday, 1st September 2025	06:25	18:55
Monday, 15th September 2025	06:28	18:43
Tuesday, 30th September 2025	06:31	18:29

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Dominican Republic - quick facts
Flight time^✝	9 hours
Time difference	UK -4 hours
Language(s)	Spanish
Currency	Dominican Peso
Electricity	A + B + C plug (120V)
Driving side	Right
Why visit?	Beaches Nature Nightlife
Tourist info	Dominican Republic Tourist Board