Weather in Washington in September 2017

Expect 26°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 D.C. in 2017.

Key weather averages for Washington in September

  • 26°C maximum daytime temperature in September in Washington26
    26°C max day temperature
  • 7 hours of sunshine per day (60% of daylight hours) in September in Washington7
    7 hours of sunshine per day
  • 7 days with some rainfall in September in Washington7
    7 days with some rainfall
  • 15°C minimum night-time temperature in September in Washington15
    15°C min night temperature
  • 12 hours of daylight per day in September in Washington12
    12 hours of daylight per day
  • Low heat & humidity in September in WashingtonL
    Low heat & humidity
  • 87 mm monthly rainfall in September in Washington87
    87 mm of monthly rainfall
  • UV (maximum) index 7 (High) in September in Washington7
    7 (High) UV index

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec All months

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

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More about Washington

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Guide to Washington weather in September

The average maximum daytime temperature in Washington in September is a warm 26°C (79°F) with low heat & humidity. The average night-time temperature is usually a comfortable 15°C (59°F). There are usually 7 hours of bright sunshine each day, which represents 60% of the 12 hours of daylight.

Expect 87mm (3.4 inches) of rainfall across the whole of September with 7 days with some rain falling. Maximum UV levels will be high (7 UV index) at midday when the skies are clear.

The weather in Washington in September is represented by Washington.

Washington sunrise & sunset times for September 2017

Browse the sunrise & sunset times for Washington in September 2017. Select a month to view Washington sunrise & sunset times for the next twelve months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st September 2017 06:37 19:38
Saturday, 2nd September 2017 06:38 19:36
Sunday, 3rd September 2017 06:39 19:35
Monday, 4th September 2017 06:40 19:33
Tuesday, 5th September 2017 06:41 19:32
Wednesday, 6th September 2017 06:42 19:30
Thursday, 7th September 2017 06:43 19:29
Friday, 8th September 2017 06:43 19:27
Saturday, 9th September 2017 06:44 19:25
Sunday, 10th September 2017 06:45 19:24
Monday, 11th September 2017 06:46 19:22
Tuesday, 12th September 2017 06:47 19:21
Wednesday, 13th September 2017 06:48 19:19
Thursday, 14th September 2017 06:49 19:17
Friday, 15th September 2017 06:50 19:16
Saturday, 16th September 2017 06:51 19:14
Sunday, 17th September 2017 06:51 19:13
Monday, 18th September 2017 06:52 19:11
Tuesday, 19th September 2017 06:53 19:09
Wednesday, 20th September 2017 06:54 19:08
Thursday, 21st September 2017 06:55 19:06
Friday, 22nd September 2017 06:56 19:05
Saturday, 23rd September 2017 06:57 19:03
Sunday, 24th September 2017 06:58 19:01
Monday, 25th September 2017 06:59 19:00
Tuesday, 26th September 2017 07:00 18:58
Wednesday, 27th September 2017 07:01 18:57
Thursday, 28th September 2017 07:01 18:55
Friday, 29th September 2017 07:02 18:54
Saturday, 30th September 2017 07:03 18:52
  • Book special offers on Virgin Atlantic flights to Washington DC
  • Flights depart from London Heathrow Airport
  • Return flights to Washington DC from £419

Expires at 23:59 on Wednesday 20th September 2017 · View all Virgin Atlantic offers

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Washington weather by month

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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