Gallatin County Weather Forecast
Gallatin County weather: 67°F, light drizzle. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
Will it rain in Gallatin County?
Possibly - there is a 30% chance in Gallatin County today.
A 30% chance means rain is likely somewhere nearby at some point - carry a layer, but do not cancel.
Over the next 7 days, about 0,1 in of precipitation is forecast.
Rainfall over the next 7 days is close to normal for August (0,1 in against a typical 0,1 in).
16-day forecast for Gallatin County
Daily highs and lows, precipitation and UV.
| Day | Conditions | High / Low | Precip | Wind | UV |
|---|---|---|---|---|---|
| Sat, Aug 22 | 🌦️ Drizzle | 87° / 64° | 30% · 0,0 in | 16 mph | 7 |
| Sun, Aug 23 | ☁️ Overcast | 87° / 60° | 25% | 16 mph | 7 |
| Mon, Aug 24 | ☁️ Overcast | 86° / 54° | 1% | 15 mph | 7 |
| Tue, Aug 25 | 🌦️ Light drizzle | 87° / 58° | 2% · 0,0 in | 14 mph | 7 |
| Wed, Aug 26 | 🌦️ Drizzle | 90° / 62° | 26% · 0,0 in | 24 mph | 7 |
| Thu, Aug 27 | ☁️ Overcast | 91° / 59° | 26% | 13 mph | 6 |
| Fri, Aug 28 | ☁️ Overcast | 92° / 62° | 25% | 11 mph | 7 |
| Sat, Aug 29 | ☁️ Overcast | 89° / 59° | 17% | 19 mph | 7 |
| Sun, Aug 30 | ☁️ Overcast | 86° / 58° | 17% | 14 mph | 7 |
| Mon, Aug 31 | ⛅ Partly cloudy | 88° / 56° | 19% | 18 mph | 7 |
| Tue, Sep 1 | ☁️ Overcast | 88° / 57° | 19% | 17 mph | 6 |
| Wed, Sep 2 | ☁️ Overcast | 87° / 56° | 8% | 13 mph | 7 |
| Thu, Sep 3 | 🌦️ Light drizzle | 89° / 57° | 11% · 0,0 in | 12 mph | 6 |
| Fri, Sep 4 | 🌦️ Light drizzle | 77° / 55° | 10% · 0,0 in | 12 mph | 7 |
| Sat, Sep 5 | ☁️ Overcast | 89° / 51° | 15% | 18 mph | 7 |
| Sun, Sep 6 | ☁️ Overcast | 94° / 58° | 17% | 14 mph | 6 |
What this means for Gallatin County
Today is warmer than average for August. The forecast high of 87°F is 7.7°F above the 80°F typical for this month.
A 30% chance means rain is likely somewhere nearby at some point - carry a layer, but do not cancel.
No weather-related travel disruption is expected today. Roads and airports should run normally.
Northern Hemisphere, so peak summer falls in June to August.
The gap between the warmest and coldest month averages 78°F.
What to pack, what to skip
- Lightweight, light-coloured clothing and a refillable water bottle
- Sunglasses, a brimmed hat and SPF 30+
- 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
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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 67°F (20°C) with light drizzle. Humidity is 47% and wind is 12 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 11:37 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 11:37 PM local time. Live blocks refresh every 15 minutes; climate averages monthly.
