Cool
Average highs are around 14°C, so pack for cooler days.
May verdict
Mixed for holiday weather
Average highs are around 14°C, so pack for cooler days. Sunshine averages 8.8h per day, so bright days are a strong part of the month. Rainfall averages 69mm, which is relatively low for holiday planning.

Monthly averages
Temp
14°C
Rain
69mm
Sun
8.8h
Weather score
41
Mixed
Cool
Average highs are around 14°C, so pack for cooler days.
Drier
Rainfall averages 69mm, which is relatively low for holiday planning.
Bright
Sunshine averages 8.8h per day, so bright days are a strong part of the month.
Map
Compare Big Sky, Montana, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
May14°C average high
May is close to Big Sky's yearly temperature average, giving a typical read on daytime heat.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
May69mm average rain
May is wetter than Big Sky's yearly average, so flexible plans matter more.
Driest monthsJanuary to May and July to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
May8.8 hours average sun
May is brighter than Big Sky's yearly average, though the strongest sunshine usually sits closer to the peak months.
Brightest monthsJune to August
This stretch has the strongest sunshine in the monthly averages.
May41 weather score
May scores below Big Sky's 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.