Gallatin County Weather Forecast
Gallatin County weather: 68°F, clear sky. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
Snow forecast for Gallatin County
No snow is in the current forecast window for Gallatin County.
0 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 |
|---|---|---|---|---|---|
| Fri, Aug 21 | ☁️ Overcast | 91° / 56° | 1% | 16 mph | 7 |
| Sat, Aug 22 | 🌦️ Light rain | 85° / 64° | 53% · 0,1 in | 19 mph | 6 |
| Sun, Aug 23 | ☁️ Overcast | 90° / 60° | 53% | 22 mph | 7 |
| Mon, Aug 24 | ☁️ Overcast | 87° / 59° | 20% | 11 mph | 7 |
| Tue, Aug 25 | ☁️ Overcast | 87° / 60° | 13% | 11 mph | 6 |
| Wed, Aug 26 | ☁️ Overcast | 88° / 63° | 18% | 16 mph | 6 |
| Thu, Aug 27 | 🌦️ Light drizzle | 91° / 61° | 18% · 0,0 in | 20 mph | 7 |
| Fri, Aug 28 | ☁️ Overcast | 90° / 57° | 15% | 13 mph | 6 |
| Sat, Aug 29 | ⛅ Partly cloudy | 90° / 57° | 15% | 17 mph | 7 |
| Sun, Aug 30 | ☀️ Clear sky | 81° / 52° | 12% | 13 mph | 7 |
| Mon, Aug 31 | ☁️ Overcast | 82° / 49° | 11% | 11 mph | 7 |
| Tue, Sep 1 | ☀️ Clear sky | 80° / 50° | 13% | 12 mph | 7 |
| Wed, Sep 2 | ☀️ Clear sky | 88° / 54° | 19% | 14 mph | 7 |
| Thu, Sep 3 | ☁️ Overcast | 91° / 58° | 19% | 14 mph | 7 |
| Fri, Sep 4 | ☁️ Overcast | 67° / 51° | 23% | 11 mph | 5 |
| Sat, Sep 5 | ☁️ Overcast | 69° / 42° | 19% | 14 mph | 6 |
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° | 0,4 in | ★★★★★ |
| September | 71° | 46° | 1,4 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
- Lightweight, light-coloured clothing and a refillable water bottle
- Sunglasses, a brimmed hat and SPF 30+
- 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 68°F (20°C) with clear sky. Humidity is 34% and wind is 2 mph.
When is the best time to visit Gallatin County?
June, July and August 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 12:07 PM.
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 August 22, 2026 at 12:07 PM local time. Live blocks refresh every 15 minutes; climate averages monthly.
