San Juan weather in September 2025

Expect 90°F daytime maximum temperatures in the shade with on average 7 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 Dominican Republic in 2025/2026.

  • 90°F maximum daytime temperature in September in San Juan90
    90°F max day temperature
  • 7 hours of sunshine per day
  • 15 days with some rainfall in September in San Juan15
    15 days with some rainfall
  • 66°F minimum night-time temperature in September in San Juan66
    66°F min night temperature
  • 12 hours of daylight per day in September in San Juan12
    12 hours of daylight per day
  • High heat & humidity in September in San JuanH
    High heat & humidity
  • 6.1 inches monthly rainfall in September in San Juan6.1
    6.1 inches of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in San Juan11
    11+ (Extreme) UV index

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The September weather guide for Dominican Republic (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)  |  Imperial (°F)

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More about the Dominican Republic

How hot is it in San Juan in September?

Daytime temperatures usually reach 90°F in San Juan in September with high heat and humidity, falling to 66°F at night.

How sunny is it in San Juan in September?

There are normally 7 hours of bright sunshine each day in San Juan in September - that's 59% of daylight hours.

Does it rain in San Juan in September?

There are usually 15 days with some rain in San Juan in September and the average monthly rainfall is 6.1 inches.

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

On average less than 1 day in September in San Juan is 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 2025. Select a month to view San Juan sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:30 18:59
Monday, 15th September 2025 06:33 18:47
Tuesday, 30th September 2025 06:35 18:34

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