Weather in Ottawa in September 2018

Expect 20°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Ottawa in September. Check more long-term weather averages for Ottawa in September before you book your next holiday to Ontario in 2018.

Key weather averages for Ottawa in September

  • 20°C maximum daytime temperature in September in Ottawa20
    20°C max day temperature
  • 6 hours of sunshine per day (46% of daylight hours) in September in Ottawa6
    6 hours of sunshine per day
  • 12 days with some rainfall in September in Ottawa12
    12 days with some rainfall
  • 9°C minimum night-time temperature in September in Ottawa9
    9°C min night temperature
  • 12 hours of daylight per day in September in Ottawa12
    12 hours of daylight per day
  • No heat & humidity in September in Ottawa0
    No heat & humidity
  • 80 mm monthly rainfall in September in Ottawa80
    80 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Ottawa5
    5 (Moderate) 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 Ottawa

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Guide to Ottawa weather in September

The average maximum daytime temperature in Ottawa in September is a comfortable 20°C (68°F). The average night-time temperature is usually a cool 9°C (48°F). There are usually 6 hours of bright sunshine each day, which represents 46% of the 12 hours of daylight.

Expect 80mm (3.1 inches) of rainfall across the whole of September with 12 days with some rain falling. Maximum UV levels will be moderate (5 UV index) at midday when the skies are clear.

The weather in Ottawa in September is represented by Ottawa.

Ottawa sunrise & sunset times for September 2018

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Saturday, 1st September 2018 06:24 19:40
Sunday, 2nd September 2018 06:25 19:39
Monday, 3rd September 2018 06:27 19:37
Tuesday, 4th September 2018 06:28 19:35
Wednesday, 5th September 2018 06:29 19:33
Thursday, 6th September 2018 06:30 19:31
Friday, 7th September 2018 06:32 19:29
Saturday, 8th September 2018 06:33 19:27
Sunday, 9th September 2018 06:34 19:25
Monday, 10th September 2018 06:35 19:23
Tuesday, 11th September 2018 06:36 19:21
Wednesday, 12th September 2018 06:38 19:20
Thursday, 13th September 2018 06:39 19:18
Friday, 14th September 2018 06:40 19:16
Saturday, 15th September 2018 06:41 19:14
Sunday, 16th September 2018 06:42 19:12
Monday, 17th September 2018 06:44 19:10
Tuesday, 18th September 2018 06:45 19:08
Wednesday, 19th September 2018 06:46 19:06
Thursday, 20th September 2018 06:47 19:04
Friday, 21st September 2018 06:49 19:02
Saturday, 22nd September 2018 06:50 19:00
Sunday, 23rd September 2018 06:51 18:58
Monday, 24th September 2018 06:52 18:56
Tuesday, 25th September 2018 06:53 18:55
Wednesday, 26th September 2018 06:55 18:53
Thursday, 27th September 2018 06:56 18:51
Friday, 28th September 2018 06:57 18:49
Saturday, 29th September 2018 06:58 18:47
Sunday, 30th September 2018 07:00 18:45
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Ottawa weather by month

Check Ottawa 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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