Helena weather in September 2019

  • 20°C maximum daytime temperature in September in Helena20
    20°C max day temperature
  • 8 hours of sunshine per day
  • 7 days with some rainfall in September in Helena7
    7 days with some rainfall
  • 4°C minimum night-time temperature in September in Helena4
    4°C min night temperature
  • 13 hours of daylight per day in September in Helena13
    13 hours of daylight per day
  • No heat & humidity in September in Helena0
    No heat & humidity
  • 30 mm monthly rainfall in September in Helena30
    30 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Helena5
    5 (Moderate) UV index

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

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Expect 20°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Helena in September. Check more long-term weather averages for Helena in September before you book your next holiday to Montana in 2019/2020.

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More about Helena

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

The September weather guide for Helena, Montana 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 Helena weather in September

The average maximum daytime temperature in Helena in September is a comfortable 20°C (68°F). The average night-time temperature is usually a cold 4°C (39°F). There are usually 8 hours of bright sunshine each day, which represents 66% of the 13 hours of daylight.

Expect 30mm (1.2 inches) of rainfall across the whole of September with 7 days with some rain falling. Maximum UV levels will be moderate (5 UV index) at midday when the skies are clear.

Helena sunrise & sunset times for September 2019

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Sunday, 1st September 2019 06:48 20:07
Monday, 2nd September 2019 06:49 20:06
Tuesday, 3rd September 2019 06:50 20:04
Wednesday, 4th September 2019 06:52 20:02
Thursday, 5th September 2019 06:53 20:00
Friday, 6th September 2019 06:54 19:58
Saturday, 7th September 2019 06:56 19:56
Sunday, 8th September 2019 06:57 19:54
Monday, 9th September 2019 06:58 19:52
Tuesday, 10th September 2019 06:59 19:50
Wednesday, 11th September 2019 07:01 19:48
Thursday, 12th September 2019 07:02 19:46
Friday, 13th September 2019 07:03 19:44
Saturday, 14th September 2019 07:04 19:42
Sunday, 15th September 2019 07:06 19:40
Monday, 16th September 2019 07:07 19:38
Tuesday, 17th September 2019 07:08 19:36
Wednesday, 18th September 2019 07:10 19:34
Thursday, 19th September 2019 07:11 19:32
Friday, 20th September 2019 07:12 19:30
Saturday, 21st September 2019 07:13 19:28
Sunday, 22nd September 2019 07:15 19:26
Monday, 23rd September 2019 07:16 19:24
Tuesday, 24th September 2019 07:17 19:22
Wednesday, 25th September 2019 07:19 19:20
Thursday, 26th September 2019 07:20 19:18
Friday, 27th September 2019 07:21 19:16
Saturday, 28th September 2019 07:23 19:14
Sunday, 29th September 2019 07:24 19:12
Monday, 30th September 2019 07:25 19:10
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