Boulder, MT weather
Today, hourly and 7-day forecast, sunrise and sunset, and the normal climate month by month
Weather in Boulder now
Loading the National Weather Service forecast…
Boulder weather by the hour
Boulder weather for the next 7 days
Source: National Weather Service (NOAA) · forecast for the coordinates of Boulder.
This week in Boulder
Sunrise, sunset and moon in Boulder
What is the weather usually like in Boulder?
Köppen climate classification, calculated from the 1991–2020 normals
- Julywarmest month · 82°F average high
- Decembercoldest month · 11°F average low
- 10.8 inprecipitation per year · 274 mm
Average high and low temperature (°F)
Average precipitation (inches)
Best time to visit Boulder: June to September, with mild temperatures and fewer rainy days.
Source: NOAA NCEI U.S. Climate Normals 1991–2020, station BOULDER, MT US (USC00241008), adjusted for the elevation of Boulder.
Boulder weather month by month
Sunrise and sunset in Boulder through the year
| Month | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 8:05 AM | 5:10 PM | 9 h 5 min |
| February | 7:29 AM | 5:55 PM | 10 h 26 min |
| March | 7:38 AM | 7:35 PM | 11 h 56 min |
| April | 6:39 AM | 8:17 PM | 13 h 37 min |
| May | 5:53 AM | 8:56 PM | 15 h 3 min |
| June | 5:34 AM | 9:23 PM | 15 h 49 min |
| July | 5:50 AM | 9:18 PM | 15 h 28 min |
| August | 6:26 AM | 8:39 PM | 14 h 12 min |
| September | 7:05 AM | 7:41 PM | 12 h 36 min |
| October | 7:44 AM | 6:43 PM | 10 h 59 min |
| November | 7:28 AM | 4:57 PM | 9 h 29 min |
| December | 8:02 AM | 4:44 PM | 8 h 41 min |
Times for the 15th of each month, local time (America/Denver).
What is the weather like in Boulder?
Boulder has a cold semi-arid climate. The warmest month is July, with an average high of 82°F (28°C), and the coldest is December, with average lows of 11°F (-11°C).
It gets about 10.8 inches (274 mm) of precipitation a year. The wettest month is June and the driest is February.
The best time to visit Boulder is June to September. At 4,908 ft of elevation, nights are cool even in summer. The live forecast on this page comes from the National Weather Service and the climate averages from NOAA’s 1991–2020 U.S. Climate Normals.
More about Boulder
Weather in towns near Boulder
Questions about the weather in Boulder
What is the hottest month in Boulder?
July, with an average high of 82°F (28°C).
What is the coldest month in Boulder?
December, with an average low of 11°F (-11°C).
How much does it rain in Boulder?
About 10.8 inches (274 mm) a year; the wettest month is June.
Does it snow in Boulder?
Snow is very rare or not recorded at the nearest weather station.
When is the best time to visit Boulder?
June to September, when temperatures are most pleasant and rainy days are fewer.
What climate does Boulder have?
Cold semi-arid (Köppen BSk).
What is the weather like in Boulder in November?
Highs average 42°F and lows 19°F, with about 0.5 inches of precipitation.
What time is sunrise in Boulder?
Around 7:28 AM in mid-November, and sunset around 4:57 PM. Today’s exact times are shown above.
Where does this Boulder weather forecast come from?
From the National Weather Service (NOAA), the official U.S. weather agency, for the exact coordinates of Boulder.
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