Gallatin County Weather Forecast
Gallatin County weather: 29°F, mainly clear. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
Tomorrow in Gallatin County - Monday, October 26
Next 24 hours
Hour-by-hour temperature, precipitation chance and wind.
Active alerts for Gallatin County
Dense Fog Advisory issued October 26 at 12:42AM MDT until October 26 at 12:00PM MDT by NWS Great Falls MT
Issued by NWS Great Falls MT
Is today a good day to visit?
Activity scores from 0 to 10 based on temperature, rain, wind, sun and visibility.
What to pack, what to skip
- A warm mid-layer and gloves for early mornings and evenings
- Insulated outer layer, hat and boots with grip for ice
- Avoid high-elevation trails without traction devices - frozen surfaces persist in shade all day.
- If your dates are flexible, avoid January, February and December - historically the least comfortable months here.
See the Gallatin County forecast by time range
Gallatin County weather - more answers
Explore Gallatin County
Every topic we hold for this place, and the same topic for the places around it.
Weather for related places
Frequently asked questions
Where is Gallatin County?
Gallatin County is a county in Montana. Its coordinates are 45.677, -111.0429. It lies in North America.
What is the weather like in Gallatin County right now?
It is currently 29°F (-2°C) with mainly clear. Humidity is 92% and wind is 3 mph.
When is the best time to visit Gallatin County?
June, July, August and September offer the most comfortable conditions in Gallatin County, which has a subarctic climate. January, February and December are usually the hardest months for outdoor plans.
What time zone is Gallatin County in?
Gallatin County observes America/Denver (UTC-06:00). The local time is 10:43 AM.
How many people live in Gallatin County?
Gallatin County has a population of approximately 125.000.
What are the top things to do in Gallatin County?
Popular options include Missouri River, Yellowstone (UNESCO World Heritage Site), Yellowstone National Park, Grand Teton National Park and Grand Teton.
Related articles
Data sources and methodology
| Place data | USPOTUS Atlas dataset (us-counties) - coordinates, hierarchy and facts. |
|---|---|
| Forecast and observations | Open-Meteo (ECMWF and national models). |
| Air quality and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Climate averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National Weather Service. |
| Method | Scores, comparisons and advice on this page are computed from the inputs above. Distances are straight-line. Nothing is estimated where data is missing - the block is simply not shown. |
Last updated October 26, 2026 at 10:43 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
