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Weather in Boulder, MT · National Weather Service + NOAA

Boulder has a dry climate

Boulder has cold winters and pleasant summers, with very little rain. A typical July afternoon reaches 82°, a January night drops to 12°. In November, a normal day reaches 42° and a normal night drops to 18°.

Winter 34°/12°Spring 54°/28°Summer 78°/45°Fall 56°/28°
Right now
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Sunrise 9:11 am · sunset 7:12 pm

Getting the latest forecast from the National Weather Service…

What stands out about Boulder’s weather

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

Climate →
A dry climateJust 11 inches of rain and melted snow a year, less than 97% of U.S. towns.
A normal year

Where today sits in Boulder’s year

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

Full climate →
Winter
34° / 12°
Snow is rare
Spring
54° / 28°
Last frost around Jun 7
Summer
78° / 45°
12 days reach 90° in a normal year
Fall now
56° / 28°
First frost around Sep 8
Pastthe usual first frost (Sep 8). Last frost next spring: Jun 7
Best months to be outside
JunJulAug
Highs of 62–84° and lows of 40° or more
When is it wettest?June, with 2.3 inches.Is it warmer than it used to be?+1.3° vs. the 20th century.What is each month like?Highs, lows, rain and snow for all 12.

Weather talk

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

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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 Boulder itself (about a 3-mile square). Snow, frost dates and day counts: the NOAA station at Boulder, MT (1 mi, frost, heat and degree days). Sunrise and sunset are calculated from the town’s position. Normals are 30-year averages, not a forecast.