Gallatin County Weather Forecast
Gallatin County weather: 54°F, clear. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
Snow forecast for Gallatin County
Snow is in the forecast for Gallatin County on Sun, Oct 11, Mon, Oct 12 and Tue, Oct 13.
5 of the next 16 nights are forecast to reach freezing.
Historically, average lows drop below freezing in January, February, March, April, November and December.
16-day forecast for Gallatin County
Daily highs and lows, precipitation and UV.
| Day | Conditions | High / Low | Precip | Wind | UV |
|---|---|---|---|---|---|
| Mon, Oct 5 | ☀️ Clear sky | 80° / 50° | 2% | 12 mph | 5 |
| Tue, Oct 6 | ☁️ Overcast | 76° / 54° | 0% | 9 mph | 5 |
| Wed, Oct 7 | ☁️ Overcast | 76° / 53° | 0% | 9 mph | 5 |
| Thu, Oct 8 | ☁️ Overcast | 75° / 50° | 0% | 8 mph | 5 |
| Fri, Oct 9 | ☁️ Overcast | 79° / 52° | 0% | 20 mph | 5 |
| Sat, Oct 10 | ☁️ Overcast | 66° / 39° | 45% | 11 mph | 4 |
| Sun, Oct 11 | ❄️ Heavy snow | 41° / 31° | 65% · 0,5 in | 13 mph | 4 |
| Mon, Oct 12 | 🌨️ Snow | 33° / 23° | 52% · 0,2 in | 8 mph | 3 |
| Tue, Oct 13 | 🌨️ Light snow | 34° / 23° | 18% · 0,0 in | 6 mph | 4 |
| Wed, Oct 14 | ☁️ Overcast | 40° / 24° | 11% | 6 mph | 4 |
| Thu, Oct 15 | ⛅ Partly cloudy | 51° / 31° | 11% | 7 mph | 4 |
| Fri, Oct 16 | ☀️ Clear sky | 58° / 38° | 3% | 7 mph | 4 |
| Sat, Oct 17 | ☁️ Overcast | 61° / 41° | 10% | 8 mph | 4 |
| Sun, Oct 18 | ☁️ Overcast | 61° / 45° | 10% | 7 mph | 3 |
| Mon, Oct 19 | ⛅ Partly cloudy | 63° / 42° | 7% | 9 mph | 4 |
| Tue, Oct 20 | 🌤️ Mainly clear | 64° / 46° | 2% | 8 mph | 4 |
Climate in Gallatin County month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| Month | Avg high | Avg low | Rainfall | Rating |
|---|---|---|---|---|
| January | 33° | 14° | 0,8 in | ★★☆☆☆ |
| February | 34° | 15° | 1,6 in | ★★☆☆☆ |
| March | 48° | 26° | 1,7 in | ★★★☆☆ |
| April | 53° | 29° | 2,8 in | ★★★☆☆ |
| May | 62° | 38° | 3,1 in | ★★★★☆ |
| June | 70° | 45° | 2,0 in | ★★★★☆ |
| July | 83° | 55° | 0,5 in | ★★★★★ |
| August | 80° | 52° | 0,6 in | ★★★★★ |
| September | 71° | 46° | 1,0 in | ★★★★☆ |
| October | 56° | 34° | 1,9 in | ★★★☆☆ |
| November | 43° | 25° | 1,0 in | ★★★☆☆ |
| December | 40° | 24° | 1,4 in | ★★☆☆☆ |
Climate type: Subarctic. Source: Open-Meteo archive (ERA5).
What to pack, what to skip
- Sunglasses, a brimmed hat and SPF 30+
- Layers - the daily swing is 80°F, so mornings feel nothing like afternoons
- A warm mid-layer and gloves for early mornings and evenings
- A packable rain shell - 2 of the next 7 days carry a real chance of rain
- 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
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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 54°F (12°C) with clear. Humidity is 24% and wind is 1 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 8:59 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 5, 2026 at 8:59 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
