Mild
Average highs are around 25°C, so days are mild rather than hot.
September verdict
Boise, Idaho, United States in September
Weather score71Very good
Very good for holiday weather
Average highs are around 25°C, so days are mild rather than hot. Sunshine averages 9.9h per day, so bright days are a strong part of the month. Rainfall averages 19mm, which is relatively low for holiday planning.
September weather
Monthly averages
Temp
25°C
Rain
19mm
Sun
9.9h
Weather score
71
Very good
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 19mm, which is relatively low for holiday planning.
Bright
Sunshine averages 9.9h per day, so bright days are a strong part of the month.
Map
Weather map
Compare Boise, Idaho, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September25°C average high
September sits in the warmer part of the year, so midday sightseeing can feel heavier than in cooler months.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
September19mm average rain
September is close to Boise's usual rainfall pattern, with little seasonal change across the year.
Driest monthsAll year
Rainfall stays comparatively low through the year.
Sun
September9.9 hours average sun
September is brighter than Boise's yearly average, though the strongest sunshine usually sits closer to the peak months.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
Weather score
September71 weather score
September sits close to Boise's yearly weather-score average, giving a typical overall read on the month.
Best weather monthsJune to August
These months have the strongest weather score in the monthly averages.
