Thunder Bay weather in September 2019

  • 17°C maximum daytime temperature in September in Thunder Bay17
    17°C max day temperature
  • 5 hours of sunshine per day
  • 13 days with some rainfall in September in Thunder Bay13
    13 days with some rainfall
  • 6°C minimum night-time temperature in September in Thunder Bay6
    6°C min night temperature
  • 13 hours of daylight per day in September in Thunder Bay13
    13 hours of daylight per day
  • No heat & humidity in September in Thunder Bay0
    No heat & humidity
  • 88 mm monthly rainfall in September in Thunder Bay88
    88 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Thunder Bay5
    5 (Moderate) UV index
  • 13°C sea temperature in September in Thunder Bay13
    13°C sea temperature

Going to Thunder Bay? Find the best month to visit Thunder Bay based on the weather.

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Expect 17°C daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Thunder Bay in September. Check more long-term weather averages for Thunder Bay in September before you book your next holiday to Ontario in 2019/2020.

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More about Thunder Bay

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The September weather guide for Thunder Bay, Ontario shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

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

Guide to Thunder Bay weather in September

The average maximum daytime temperature in Thunder Bay in September is a comfortable 17°C (63°F). The average night-time temperature is usually a cold 6°C (43°F). There are usually 5 hours of bright sunshine each day, which represents 42% of the 13 hours of daylight.

Expect 88mm (3.5 inches) of rainfall across the whole of September with 13 days with some rain falling. Maximum UV levels will be moderate (5 UV index) at midday when the skies are clear.

The average sea temperature in and around Thunder Bay in September is 13°C (55°F).

Thunder Bay sunrise & sunset times for September 2019

Browse the sunrise & sunset times for Thunder Bay in September 2019. Select a month to view Thunder Bay sunrise & sunset times for the next twelve months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Sunday, 1st September 2019 07:14 20:39
Monday, 2nd September 2019 07:15 20:37
Tuesday, 3rd September 2019 07:17 20:35
Wednesday, 4th September 2019 07:18 20:33
Thursday, 5th September 2019 07:20 20:31
Friday, 6th September 2019 07:21 20:29
Saturday, 7th September 2019 07:22 20:27
Sunday, 8th September 2019 07:24 20:25
Monday, 9th September 2019 07:25 20:23
Tuesday, 10th September 2019 07:27 20:20
Wednesday, 11th September 2019 07:28 20:18
Thursday, 12th September 2019 07:29 20:16
Friday, 13th September 2019 07:31 20:14
Saturday, 14th September 2019 07:32 20:12
Sunday, 15th September 2019 07:34 20:10
Monday, 16th September 2019 07:35 20:08
Tuesday, 17th September 2019 07:36 20:06
Wednesday, 18th September 2019 07:38 20:04
Thursday, 19th September 2019 07:39 20:02
Friday, 20th September 2019 07:41 19:59
Saturday, 21st September 2019 07:42 19:57
Sunday, 22nd September 2019 07:43 19:55
Monday, 23rd September 2019 07:45 19:53
Tuesday, 24th September 2019 07:46 19:51
Wednesday, 25th September 2019 07:48 19:49
Thursday, 26th September 2019 07:49 19:47
Friday, 27th September 2019 07:50 19:45
Saturday, 28th September 2019 07:52 19:43
Sunday, 29th September 2019 07:53 19:41
Monday, 30th September 2019 07:55 19:38
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Popular Ontario destinations

Below are average maximum temperatures at popular destinations in Ontario in September. Select a destination to see more weather parameters.

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