Weather in Key West in September 2018

  • 31°C maximum daytime temperature in September in Key West31
    31°C max day temperature
  • 9 hours of sunshine per day (73% of daylight hours) in September in Key West9
    9 hours of sunshine per day
  • 15 days with some rainfall in September in Key West15
    15 days with some rainfall
  • 25°C minimum night-time temperature in September in Key West25
    25°C min night temperature
  • 12 hours of daylight per day in September in Key West12
    12 hours of daylight per day
  • Very high heat & humidity in September in Key WestVH
    Very High heat & humidity
  • 166 mm monthly rainfall in September in Key West166
    166 mm of monthly rainfall
  • UV (maximum) index 10 (Very High) in September in Key West10
    10 (Very High) UV index
  • 29°C sea temperature in September in Key West29
    29°C sea temperature

Going to Key West? Find the best month to visit Key West based on the weather.

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Expect 31°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Key West in September. Check more long-term weather averages for Key West in September before you book your next holiday to Florida in 2018/2019.

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More about Key West

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

Guide to Key West weather in September

The average maximum daytime temperature in Key West in September is a hot 31°C (88°F) with very high heat & humidity. The average night-time temperature is usually a warm 25°C (77°F). There are usually 9 hours of bright sunshine each day, which represents 73% of the 12 hours of daylight.

Expect 166mm (6.5 inches) of rainfall across the whole of September with 15 days with some rain falling. Maximum UV levels will be very high (10 UV index) at midday when the skies are clear.

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

Key West sunrise & sunset times for September 2018

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Saturday, 1st September 2018 07:08 19:45
Sunday, 2nd September 2018 07:09 19:44
Monday, 3rd September 2018 07:09 19:43
Tuesday, 4th September 2018 07:09 19:42
Wednesday, 5th September 2018 07:10 19:41
Thursday, 6th September 2018 07:10 19:40
Friday, 7th September 2018 07:10 19:39
Saturday, 8th September 2018 07:11 19:38
Sunday, 9th September 2018 07:11 19:37
Monday, 10th September 2018 07:11 19:36
Tuesday, 11th September 2018 07:12 19:35
Wednesday, 12th September 2018 07:12 19:34
Thursday, 13th September 2018 07:13 19:33
Friday, 14th September 2018 07:13 19:32
Saturday, 15th September 2018 07:13 19:31
Sunday, 16th September 2018 07:14 19:30
Monday, 17th September 2018 07:14 19:29
Tuesday, 18th September 2018 07:14 19:28
Wednesday, 19th September 2018 07:15 19:27
Thursday, 20th September 2018 07:15 19:26
Friday, 21st September 2018 07:15 19:24
Saturday, 22nd September 2018 07:16 19:23
Sunday, 23rd September 2018 07:16 19:22
Monday, 24th September 2018 07:16 19:21
Tuesday, 25th September 2018 07:17 19:20
Wednesday, 26th September 2018 07:17 19:19
Thursday, 27th September 2018 07:18 19:18
Friday, 28th September 2018 07:18 19:17
Saturday, 29th September 2018 07:18 19:16
Sunday, 30th September 2018 07:19 19:15
  • Save on holidays to Florida with the latest special offers
  • Book holidays to Miami or the theme parks of Orlando
  • Plus the Florida Keys or the beach on the Gulf or Atlantic coast

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