Weather in San Juan in September 2018

  • 30°C maximum daytime temperature in September in San Juan30
    30°C max day temperature
  • 8 hours of sunshine per day (64% of daylight hours) in September in San Juan8
    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

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 2018.

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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).

The weather in San Juan in September is represented by San Juan.

San Juan sunrise & sunset times for September 2018

Browse the sunrise & sunset times for San Juan in September 2018. Select a month to view San Juan sunrise & sunset times for the next twelve months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Saturday, 1st September 2018 06:10 18:39
Sunday, 2nd September 2018 06:10 18:38
Monday, 3rd September 2018 06:10 18:37
Tuesday, 4th September 2018 06:10 18:36
Wednesday, 5th September 2018 06:11 18:35
Thursday, 6th September 2018 06:11 18:34
Friday, 7th September 2018 06:11 18:34
Saturday, 8th September 2018 06:11 18:33
Sunday, 9th September 2018 06:11 18:32
Monday, 10th September 2018 06:11 18:31
Tuesday, 11th September 2018 06:12 18:30
Wednesday, 12th September 2018 06:12 18:29
Thursday, 13th September 2018 06:12 18:28
Friday, 14th September 2018 06:12 18:28
Saturday, 15th September 2018 06:12 18:27
Sunday, 16th September 2018 06:12 18:26
Monday, 17th September 2018 06:12 18:25
Tuesday, 18th September 2018 06:13 18:24
Wednesday, 19th September 2018 06:13 18:23
Thursday, 20th September 2018 06:13 18:22
Friday, 21st September 2018 06:13 18:21
Saturday, 22nd September 2018 06:13 18:21
Sunday, 23rd September 2018 06:13 18:20
Monday, 24th September 2018 06:14 18:19
Tuesday, 25th September 2018 06:14 18:18
Wednesday, 26th September 2018 06:14 18:17
Thursday, 27th September 2018 06:14 18:16
Friday, 28th September 2018 06:14 18:15
Saturday, 29th September 2018 06:15 18:15
Sunday, 30th September 2018 06:15 18:14
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San Juan weather by month

Check San Juan weather for a particular month by selecting from the list below. Monthly weather guides include figures for temperature, rainfall, sunshine hours and sea temperature plus daily sunrise & sunset times.

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