The highest day temperature in May 2025 was 74°F. The lowest night temperature was 22°F. The average values for day and night temperatures during May were 51.0°F и 37.2°F respectivly.

Most of the days in May are gloomy but you can also expect sunny days.

Precipitation total in May for Big Sky is 2.1 in. It makes may the most rainy month of the year.

The average wind speed in May is 5.0 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Big Sky in May is 7.0 hours.