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Weather in September in Boise, Idaho

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< September >
 
Normal Max/ High Temperature 25°C (77°F)
 
Average Temperature 17°C (63°F)
 
Min/ Low Temperature 9°C (48°F)
 
Normal Precipitation 20mm (0.8in)
Number of Wet Days (probability of rain on a day) 3 (10%)
Average Sunlight per day 10:19
Average Daylight per day 12:27
Sunny (Cloudy) Daylight Hours 84% (16%)
Sun altitude at solar noon on the 21st day.
46.9°


  • 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 average daily temperature range/ variation is 16 °C (28.8 °F).
  • The weather in September is somewhat parched with infrequent rain. A paltry 20.3mm (0.8in) of fluid accrues during an average of 3 days.
  • The heavens above Boise, Idaho are very sunny having on average an appreciable 10:19 of splendid solar radiation daily.
  • 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.

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Weather Trend Graph for September in Boise, Idaho, Usa

Graph of weather in Boise, Idaho in September

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