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Weather in Custer, MT · National Weather Service + NOAA

Custer has some of Montana’s warmest summers

Custer has cold, snowy winters and warm summers, with very little rain. A typical July afternoon reaches 89°, a January night drops to 11°, and about 37 inches of snow falls in a normal winter. Normal November highs come to 47°, and lows to 21°.

Winter 37°/13°Spring 60°/32°Summer 85°/54°Fall 62°/33°
Right now
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Sunrise 8:55 am · sunset 6:51 pm

Getting the latest forecast from the National Weather Service…

What stands out about Custer’s weather

Read from 30 years of NOAA records. Each one opens the full story on the Climate page.

Climate →
Warmer summers than most of MontanaJuly afternoons average 89°, warmer than 484 of 497 Montana towns.A dry climateJust 14 inches of rain and melted snow a year, less than 95% of U.S. towns.A long growing season141 frost-free days, from May 10 to Sep 29.
A normal year

Where today sits in Custer’s year

Typical highs and lows month by month, from 30 years of NOAA records.

Full climate →
Winter
37° / 13°
16 days with an inch or more of snow
Spring
60° / 32°
Last frost around May 10
Summer
85° / 54°
31 days reach 90° in a normal year
Fall now
62° / 33°
First frost around Sep 29
Pastthe usual first frost (Sep 29). Last frost next spring: May 10
Best months to be outside
MayJunSep
Highs of 62–84° and lows of 40° or more
How much snow does Custer get?About 37 inches a winter.When is it wettest?May, with 2.5 inches.Is it warmer than it used to be?+1.2° vs. the 20th century.

Weather talk

Road reports, first frosts and storm memories from neighbors in Custer.

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Forecast, conditions and alerts: National Weather Service. Climate: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Temperatures and rainfall come from NOAA’s gridded normals for Custer itself (about a 3-mile square). Snow, frost dates and day counts: the NOAA station at Hysham, MT (19 mi). Sunrise and sunset are calculated from the town’s position. Normals are 30-year averages, not a forecast.