Weather in Washington in September 2018

  • 21°C maximum daytime temperature in September in Washington (Seattle)21
    21°C max day temperature
  • 7 hours of sunshine per day (57% of daylight hours) in September in Washington7
    7 hours of sunshine per day
  • 9 days with some rainfall in September in Washington (Seattle)9
    9 days with some rainfall
  • 11°C minimum night-time temperature in September in Washington (Seattle)11
    11°C min night temperature
  • 13 hours of daylight per day in September in Washington (Seattle)13
    13 hours of daylight per day
  • No heat & humidity in September in Washington (Seattle)0
    No heat & humidity
  • 49 mm monthly rainfall in September in Washington (Seattle)49
    49 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Washington (Seattle)5
    5 (Moderate) UV index

Expect 21°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Washington in September. Check more long-term weather averages for Washington in September before you book your next holiday to Washington in 2018. The September weather averages shown above are for Seattle.

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Guide to Washington weather in September

The average maximum daytime temperature in Washington in September is a comfortable 21°C (70°F). The average night-time temperature is usually a cool 11°C (52°F). There are usually 7 hours of bright sunshine each day, which represents 57% of the 13 hours of daylight.

Expect 49mm (1.9 inches) of rainfall across the whole of September with 9 days with some rain falling. Maximum UV levels will be moderate (5 UV index) at midday when the skies are clear.

The weather in Washington in September is represented by Seattle.

Washington sunrise & sunset times for September 2018

Browse the sunrise & sunset times for Washington in September 2018. Select a month to view Washington sunrise & sunset times for the next twelve months. The Washington sunrise & sunset times shown below are for Seattle.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Saturday, 1st September 2018 06:28 19:50
Sunday, 2nd September 2018 06:29 19:48
Monday, 3rd September 2018 06:31 19:46
Tuesday, 4th September 2018 06:32 19:44
Wednesday, 5th September 2018 06:33 19:42
Thursday, 6th September 2018 06:35 19:40
Friday, 7th September 2018 06:36 19:37
Saturday, 8th September 2018 06:37 19:35
Sunday, 9th September 2018 06:39 19:33
Monday, 10th September 2018 06:40 19:31
Tuesday, 11th September 2018 06:41 19:29
Wednesday, 12th September 2018 06:43 19:27
Thursday, 13th September 2018 06:44 19:25
Friday, 14th September 2018 06:45 19:23
Saturday, 15th September 2018 06:47 19:21
Sunday, 16th September 2018 06:48 19:19
Monday, 17th September 2018 06:50 19:17
Tuesday, 18th September 2018 06:51 19:15
Wednesday, 19th September 2018 06:52 19:13
Thursday, 20th September 2018 06:54 19:11
Friday, 21st September 2018 06:55 19:09
Saturday, 22nd September 2018 06:56 19:07
Sunday, 23rd September 2018 06:58 19:05
Monday, 24th September 2018 06:59 19:03
Tuesday, 25th September 2018 07:00 19:01
Wednesday, 26th September 2018 07:02 18:59
Thursday, 27th September 2018 07:03 18:57
Friday, 28th September 2018 07:04 18:55
Saturday, 29th September 2018 07:06 18:52
Sunday, 30th September 2018 07:07 18:50
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Check Washington 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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