| < September >
|Normal Max/ High Temperature
|Min/ Low Temperature
|Number of Wet Days (probability of rain on a day)
|Average Sunlight per day
|Average Daylight per day
|Sunny (Cloudy) Daylight Hours
|Sun altitude at solar noon on the 21st day.
- The average temperature in Boise, Idaho in September is very mild at 17 °C (62.6 °F).
- Afternoons can be fairly hot with average high temperatures reaching 25 °C (77 °F).
- Overnight temperatures are generally a little cool with an average low of 9 °C (48.2 °F).
- In September the variation/ range of daily mean temperatures is 16 °C (28.8 °F).
- The weather in September is somewhat parched with infrequent rain. A paltry 20.3mm (0.8in) of H2O falls during on average 3 days.
- The skies in Boise, Idaho are very sunny having on balance an appreciable 10:19 of radiant sunlight per day.
- The shortest day is 11:42 long and the longest day is 13:11 long with an average length of 12:27.
- There are approximately 1:57 per day when bright sunshine is absent due to cloud, haze or the sun being too low on the horizon to register.
- It is sunny approximately 84.1% of daylight hours and cloudy 15.9% of daylight hours.
Check the distance to and compare the Boise, Idaho September averages with somewhere beginning with:
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Weather Trend Graph for September in Boise, Idaho, Usa
Navigate to September Weather in Locations Surrounding Boise, Idaho:
- Lewiston, Id, Usa - 319.5 kms (198.5 miles) N
- Daytonwsw, Wa, Usa - 336.4 kms (209 miles) NNW
- Walla Walla, Washington, Usa - 321.3 kms (199.6 miles) NNW
- Sunnyside, Wa, Usa - 403.1 kms (250.5 miles) NW
- Pendleton, Or, Usa - 314.6 kms (195.5 miles) NW
- Moro, Or, Usa - 413.1 kms (256.7 miles) WNW
- Burns, Oregon, Usa - 228.7 kms (142.1 miles) W
- Golconda, Nv, Usa - 292.7 kms (181.9 miles) SSW
- Winnemucca, Nevada, Usa - 324.1 kms (201.4 miles) SSW
- Missoula, Mt, Usa - 408 kms (253.5 miles) NNE
- Dillon, Mt, Usa - 301.2 kms (187.2 miles) ENE
- Pocatello, Idaho, Usa - 301.3 kms (187.2 miles) ESE
- Oakley, Id, Usa - 250.9 kms (155.9 miles) SE
- Elko, Nv, Usa - 306.2 kms (190.3 miles) S