Cold steppe climate
Climate Boulder - Montana
Annual high57ºF
Annual low28ºF
Precipitation11.37 inch
| Month | HighºF | LowºF | Precipinch |
|---|---|---|---|
| Jan | 35 | 12 | 0.31 |
| Feb | 39 | 15 | 0.26 |
| Mar | 47 | 21 | 0.47 |
| Apr | 55 | 27 | 0.75 |
| May | 64 | 35 | 1.99 |
| Jun | 73 | 43 | 2.16 |
| Jul | 82 | 48 | 1.65 |
| Aug | 82 | 46 | 1.33 |
| Sep | 71 | 37 | 0.99 |
| Oct | 58 | 28 | 0.64 |
| Nov | 42 | 19 | 0.49 |
| Dec | 33 | 10 | 0.33 |
- JanHigh 35ºFLow 12ºFPrecip 0.31 inch
- FebHigh 39ºFLow 15ºFPrecip 0.26 inch
- MarHigh 47ºFLow 21ºFPrecip 0.47 inch
- AprHigh 55ºFLow 27ºFPrecip 0.75 inch
- MayHigh 64ºFLow 35ºFPrecip 1.99 inch
- JunHigh 73ºFLow 43ºFPrecip 2.16 inch
- JulHigh 82ºFLow 48ºFPrecip 1.65 inch
- AugHigh 82ºFLow 46ºFPrecip 1.33 inch
- SepHigh 71ºFLow 37ºFPrecip 0.99 inch
- OctHigh 58ºFLow 28ºFPrecip 0.64 inch
- NovHigh 42ºFLow 19ºFPrecip 0.49 inch
- DecHigh 33ºFLow 10ºFPrecip 0.33 inch
Climate summary
What is the average weather in Boulder, Montana?
Boulder experiences a cold semi-arid climate, marked by very large seasonal temperature contrasts due to its inland location. Summers are warm, while winters are cold. The area is dry overall, with precipitation generally low, though summers are wetter, occasionally bringing brief showers. Winters are the driest season.
Boulder weather averages
Annual high57ºF
Annual low28ºF
Precipitation11.37 inch
Daily normals Boulder - Montana - January
| Day | HighºF | LowºF | Prec/ | Prec/ |
|---|---|---|---|---|
| Jan 1 | 33.6 | 10.6 | 0.01 | 0.01 |
| Jan 2 | 33.7 | 10.7 | 0.02 | 0.02 |
| Jan 3 | 33.9 | 10.7 | 0.03 | 0.03 |
| Jan 4 | 34.0 | 10.8 | 0.04 | 0.04 |
| Jan 5 | 34.1 | 10.9 | 0.05 | 0.05 |
| Jan 6 | 34.2 | 11.0 | 0.05 | 0.05 |
| Jan 7 | 34.3 | 11.1 | 0.06 | 0.06 |
| Jan 8 | 34.4 | 11.2 | 0.07 | 0.07 |
| Jan 9 | 34.6 | 11.3 | 0.08 | 0.08 |
| Jan 10 | 34.7 | 11.4 | 0.09 | 0.09 |
| Jan 11 | 34.8 | 11.5 | 0.11 | 0.11 |
| Jan 12 | 34.9 | 11.6 | 0.12 | 0.12 |
| Jan 13 | 34.9 | 11.7 | 0.13 | 0.13 |
| Jan 14 | 35.0 | 11.8 | 0.14 | 0.14 |
| Jan 15 | 35.1 | 11.9 | 0.15 | 0.15 |
| Jan 16 | 35.2 | 12.0 | 0.15 | 0.15 |
| Jan 17 | 35.3 | 12.1 | 0.16 | 0.16 |
| Jan 18 | 35.3 | 12.2 | 0.17 | 0.17 |
| Jan 19 | 35.4 | 12.3 | 0.18 | 0.18 |
| Jan 20 | 35.4 | 12.4 | 0.19 | 0.19 |
| Jan 21 | 35.5 | 12.4 | 0.20 | 0.20 |
| Jan 22 | 35.5 | 12.5 | 0.21 | 0.21 |
| Jan 23 | 35.6 | 12.5 | 0.21 | 0.21 |
| Jan 24 | 35.6 | 12.6 | 0.22 | 0.22 |
| Jan 25 | 35.6 | 12.6 | 0.23 | 0.23 |
| Jan 26 | 35.7 | 12.7 | 0.24 | 0.24 |
| Jan 27 | 35.7 | 12.7 | 0.25 | 0.25 |
| Jan 28 | 35.7 | 12.8 | 0.26 | 0.26 |
| Jan 29 | 35.8 | 12.8 | 0.26 | 0.26 |
| Jan 30 | 35.8 | 12.8 | 0.27 | 0.27 |
| Jan 31 | 35.8 | 12.9 | 0.28 | 0.28 |
Precipitation and snow add up through the month (/mo) and the year (/yr)
Weather history Boulder - September 2026
| Day | HighºF | LowºF | Precip.inch |
|---|---|---|---|
| Sep 1 | 79.0 | 36.0 | 0.00 |
| Sep 2 | 80.1 | 48.9 | 0.00 |
| Sep 3 | – | – | – |
| Sep 4 | – | – | – |
| Sep 5 | – | – | – |
| Sep 6 | – | – | – |
| Sep 7 | – | – | – |
| Sep 8 | 78.1 | 35.1 | 0.30 |
| Sep 9 | 69.1 | 32.0 | 0.01 |
| Sep 10 | – | – | – |
| Sep 11 | – | – | – |
| Sep 12 | – | – | – |
| Sep 13 | 81.0 | 36.0 | 0.00 |
| Sep 14 | 68.0 | 37.0 | 0.05 |
| Sep 15 | 66.0 | 30.0 | 0.00 |
| Sep 16 | 70.0 | 39.9 | 0.00 |
| Sep 17 | – | – | – |
| Sep 18 | – | – | – |
| Sep 19 | – | – | – |
| Sep 20 | 73.9 | 37.0 | – |
| Sep 21 | 73.9 | 37.0 | 0.00 |
| Sep 22 | 72.0 | 39.0 | 0.00 |
| Sep 23 | 82.0 | 24.1 | 0.00 |
| Sep 24 | – | – | – |
| Sep 25 | – | – | – |
| Sep 26 | – | – | – |
| Sep 27 | 51.1 | 27.0 | 0.00 |
| Sep 28 | 64.9 | 32.0 | 0.00 |
| Sep 29 | – | – | – |
| Sep 30 | 71.1 | 30.0 | 0.00 |
The data for September 2026 is incomplete: some days or values are missing.
- –No data
- –Not yet observed or received
- TTrace, too small to measure
Observed extremes
- Highest max temperature82.0ºF · Sep 23
- Lowest max temperature51.1ºF · Sep 27
- Highest min temperature48.9ºF · Sep 2
- Lowest min temperature24.1ºF · Sep 23
Geo Boulder - Montana
Location
- Country
- United States
- State
- Montana
- County
- Jefferson
- City
- Boulder
- Zip Code
- 59632
- Elevation
- 4921 ft
- Longitude
- -112.11
- Latitude
- 46.21
- ICAO
- –
- IATA
- –