Warm
Average highs sit around 31°C, giving warm days by monthly-average standards.
Weather Guide
Lewiston, Idaho, United States Average Monthly Weather
Weather score50Mixed annual avg
Best months: July, August, June
Across the year, average daytime temperatures are around 17°C, sunshine averages 7.1h per day, and rainfall totals about 414mm.
Annual weather
Annual averages
Temp
17°C
Rain
414mm
Annual total
Sun
7.1h
Weather score
50
Mixed avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 22mm, which is relatively low for holiday planning.
Bright
Sunshine averages 12h per day, so bright days are a strong part of the month.
Map
Weather map
Compare Lewiston, Idaho, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
August31°C average high
August is one of Lewiston's warmest months, with daytime heat above the yearly average.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
August22mm average rain
August is close to Lewiston's usual rainfall pattern, with little seasonal change across the year.
Driest monthsAll year
Rainfall stays comparatively low through the year.
Sun
August12 hours average sun
August is brighter than Lewiston's yearly average, though the strongest sunshine usually sits closer to the peak months.
Brightest monthsJuly to August
This stretch has the strongest sunshine in the monthly averages.
Weather score
August89 weather score
August is one of Lewiston's best weather-score months, combining the strongest overall balance in the yearly averages.
Best weather monthsJuly to August
These months have the strongest weather score in the monthly averages.
