San Juan weather in September 2019

  • 30°C maximum daytime temperature in September in San Juan30
    30°C max day temperature
  • 8 hours of sunshine per day
  • 18 days with some rainfall in September in San Juan18
    18 days with some rainfall
  • 23°C minimum night-time temperature in September in San Juan23
    23°C 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
  • 188 mm monthly rainfall in September in San Juan188
    188 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in San Juan11
    11+ (Extreme) UV index
  • 29°C sea temperature in September in San Juan29
    29°C sea temperature
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The September weather guide for San Juan, Puerto Rico 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.

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Expires at 23:59 on Wednesday 31st Jul 2019 · View all IHG offers

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

Guide to San Juan weather in September

The average maximum daytime temperature in San Juan in September is a hot 30°C (86°F) with high heat & humidity. The average night-time temperature is usually a warm 23°C (73°F). There are usually 8 hours of bright sunshine each day, which represents 64% of the 12 hours of daylight.

Expect 188mm (7.4 inches) of rainfall across the whole of September with 18 days with some rain falling. Maximum UV levels will be extreme (11+ UV index) at midday when the skies are clear.

The average sea temperature in and around San Juan in September is 29°C (84°F).

San Juan sunrise & sunset times for September 2019

Browse the sunrise & sunset times for San Juan in September 2019. Select a month to view San Juan sunrise & sunset times for the next twelve months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Sunday, 1st September 2019 06:10 18:39
Sunday, 15th September 2019 06:12 18:27
Monday, 30th September 2019 06:15 18:14
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  • Travel before 15th September 2019 (inclusive)

Expires at 23:59 on Wednesday 31st Jul 2019 · View all IHG offers

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