Weather in Idaho in September 2018

Expect 25°C daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in Idaho in September. Check more long-term weather averages for Idaho in September before you book your next holiday to Idaho in 2018. The September weather averages shown below are for Boise.

Key weather averages for Idaho in September

  • 25°C maximum daytime temperature in September in Idaho (Boise)25
    25°C max day temperature
  • 10 hours of sunshine per day (80% of daylight hours) in September in Idaho10
    10 hours of sunshine per day
  • 4 days with some rainfall in September in Idaho (Boise)4
    4 days with some rainfall
  • 8°C minimum night-time temperature in September in Idaho (Boise)8
    8°C min night temperature
  • 12 hours of daylight per day in September in Idaho (Boise)12
    12 hours of daylight per day
  • No heat & humidity in September in Idaho (Boise)0
    No heat & humidity
  • 19 mm monthly rainfall in September in Idaho (Boise)19
    19 mm of monthly rainfall
  • UV (maximum) index 6 (High) in September in Idaho (Boise)6
    6 (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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Guide to Idaho weather in September

The average maximum daytime temperature in Idaho in September is a warm 25°C (77°F). The average night-time temperature is usually a cool 8°C (46°F). There are usually 10 hours of bright sunshine each day, which represents 80% of the 12 hours of daylight.

Expect 19mm (0.7 inches) of rainfall across the whole of September with 4 days with some rain falling. Maximum UV levels will be high (6 UV index) at midday when the skies are clear.

The weather in Idaho in September is represented by Boise.

Idaho sunrise & sunset times for September 2018

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Saturday, 1st September 2018 07:09 20:20
Sunday, 2nd September 2018 07:10 20:18
Monday, 3rd September 2018 07:11 20:16
Tuesday, 4th September 2018 07:12 20:15
Wednesday, 5th September 2018 07:13 20:13
Thursday, 6th September 2018 07:14 20:11
Friday, 7th September 2018 07:15 20:09
Saturday, 8th September 2018 07:16 20:08
Sunday, 9th September 2018 07:18 20:06
Monday, 10th September 2018 07:19 20:04
Tuesday, 11th September 2018 07:20 20:02
Wednesday, 12th September 2018 07:21 20:00
Thursday, 13th September 2018 07:22 19:58
Friday, 14th September 2018 07:23 19:57
Saturday, 15th September 2018 07:24 19:55
Sunday, 16th September 2018 07:25 19:53
Monday, 17th September 2018 07:27 19:51
Tuesday, 18th September 2018 07:28 19:49
Wednesday, 19th September 2018 07:29 19:48
Thursday, 20th September 2018 07:30 19:46
Friday, 21st September 2018 07:31 19:44
Saturday, 22nd September 2018 07:32 19:42
Sunday, 23rd September 2018 07:33 19:40
Monday, 24th September 2018 07:34 19:38
Tuesday, 25th September 2018 07:36 19:37
Wednesday, 26th September 2018 07:37 19:35
Thursday, 27th September 2018 07:38 19:33
Friday, 28th September 2018 07:39 19:31
Saturday, 29th September 2018 07:40 19:29
Sunday, 30th September 2018 07:41 19:27
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Check Idaho 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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