Cool
Average highs are around 18°C, so pack for cooler days.
May verdict
Helena, Montana, United States in May
Weather score42Mixed
Mixed for holiday weather
Average highs are around 18°C, so pack for cooler days. Sunshine averages 8.9h per day, so bright days are a strong part of the month. Rainfall averages 51mm, which is relatively low for holiday planning.
May weather
Monthly averages
Temp
18°C
Rain
51mm
Sun
8.9h
Weather score
42
Mixed
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 51mm, which is relatively low for holiday planning.
Bright
Sunshine averages 8.9h per day, so bright days are a strong part of the month.
Map
Weather map
Compare Helena, Montana, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
May18°C average high
May is close to Helena's yearly temperature average, giving a typical read on daytime heat.
Warmest monthsJune to August
This stretch sets the upper range for average daytime heat.
Rain
May51mm average rain
May is one of Helena's wettest months, so rain is likely to be a major planning factor.
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
May8.9 hours average sun
May sits close to Helena's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsJune to August
This stretch has the strongest sunshine in the monthly averages.
Weather score
May42 weather score
May scores below Helena'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.
