Cool
Average highs are around 15°C, so pack for cooler days.
Weather Guide
Great Falls, Montana, United States Average Monthly Weather
Weather score49Mixed annual avg
Best months: July, August, June
Across the year, average daytime temperatures are around 13°C, sunshine averages 7.4h per day, and rainfall totals about 372mm.
Annual weather
Annual averages
Temp
13°C
Rain
372mm
Annual total
Sun
7.4h
Weather score
49
Mixed avg
Seasonal climate calendar
Trip feel
Drier
Rainfall averages 19mm, which is relatively low for holiday planning.
Some sun
Sunshine averages 6.3h per day, enough for a balanced month.
Map
Weather map
Compare Great Falls, Montana, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
October15°C average high
October is close to Great Falls' yearly temperature average, giving a typical read on daytime heat.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
October19mm average rain
October is one of Great Falls' driest months, making outdoor days easier to plan than in wetter parts of the year.
Driest monthsJanuary to April and July to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
October6.3 hours average sun
October is below Great Falls' yearly sunshine average, so bright-day planning is less reliable than in peak months.
Brightest monthsJune to August
This stretch has the strongest sunshine in the monthly averages.
Weather score
October42 weather score
October scores below Great Falls' yearly average, so the weather trade-offs are more noticeable.
Best weather monthsJuly to August
These months have the strongest weather score in the monthly averages.
