Gallatin County Weather Forecast
Gallatin County weather: 42°F, clear sky. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
Summary
Gallatin County is a county in Montana. Gallatin County is a county in the United States. It has a population of about 125.000.
Right now it is 42°F (6°C) in Gallatin County with clear sky. It feels like 38°F. Today runs from 42°F to 74°F. Chance of precipitation is 1%. Sightseeing conditions score 8.3/10 - good conditions.
The best time to visit Gallatin County is June, July, August and September. The climate is subarctic. January, February and December tend to be the least comfortable months. July is the warmest month with average highs near 83°F, while January is the coldest with lows near 14°F.
Nearby highlights include Missouri River, Yellowstone (UNESCO World Heritage Site), Yellowstone National Park and Grand Teton National Park.
In plain terms. Today is much warmer than average for October. The forecast high of 74°F is 18.9°F above the 56°F typical for this month. The best window to be outside is roughly 1 PM to 4 PM, when temperature, rain chance and wind line up best. stargazing is the strongest bet in Gallatin County today at 10/10. No weather-related travel disruption is expected today. Roads and airports should run normally.
Compiled from this page's own data: atlas facts plus live Open-Meteo readings.
Active alerts for Gallatin County
Derived from the forecast. No official alert feed is wired for this country yet.
Weather in Gallatin County right now
Source: Open-Meteo. Updated 8:13 AM, Oct 2 local time.
See the Gallatin County forecast by time range
Next 24 hours
Hour-by-hour temperature, precipitation chance and wind.
16-day forecast for Gallatin County
Daily highs and lows, precipitation and UV.
| Day | Conditions | High / Low | Precip | Wind | UV |
|---|---|---|---|---|---|
| Fri, Oct 2 | ☁️ Overcast | 74° / 42° | 1% | 13 mph | 5 |
| Sat, Oct 3 | ☁️ Overcast | 71° / 47° | 2% | 13 mph | 5 |
| Sun, Oct 4 | ☁️ Overcast | 77° / 50° | 0% | 12 mph | 5 |
| Mon, Oct 5 | ☁️ Overcast | 83° / 57° | 0% | 13 mph | 4 |
| Tue, Oct 6 | ☁️ Overcast | 79° / 57° | 0% | 14 mph | 5 |
| Wed, Oct 7 | ☁️ Overcast | 77° / 54° | 0% | 11 mph | 5 |
| Thu, Oct 8 | ☀️ Clear sky | 76° / 51° | 0% | 12 mph | 5 |
| Fri, Oct 9 | ☁️ Overcast | 85° / 59° | 5% | 19 mph | 4 |
| Sat, Oct 10 | 🌧️ Showers | 61° / 47° | 22% · 1,0 in | 13 mph | 2 |
| Sun, Oct 11 | 🌦️ Light drizzle | 61° / 41° | 22% · 0,0 in | 24 mph | 3 |
| Mon, Oct 12 | ☁️ Overcast | 52° / 39° | 11% | 19 mph | 4 |
| Tue, Oct 13 | ☁️ Overcast | 70° / 40° | 6% | 15 mph | 4 |
| Wed, Oct 14 | 🌦️ Light drizzle | 59° / 36° | 19% · 0,0 in | 21 mph | 4 |
| Thu, Oct 15 | 🌨️ Light snow showers | 35° / 19° | 16% · 0,2 in | 8 mph | 3 |
| Fri, Oct 16 | ⛅ Partly cloudy | 37° / 17° | 12% | 9 mph | 4 |
| Sat, Oct 17 | ☀️ Clear sky | 46° / 23° | 13% | 10 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).
Weather map for Gallatin County
Animated model layers. Pick a layer to load it.
Animated layers by Windy. For pin-level detail and nearby places, see the interactive map below.
Air quality and pollen in Gallatin County
Air quality: Open-Meteo (CAMS). US AQI scale.
Sun, twilight and moon
Golden and blue hour are the standard photographic approximation around sunrise and sunset.
Best time to visit Gallatin County
Go in June, July, August and September. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: January, February and December - expect the least comfortable mix of heat, cold or rain.
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 42°F (6°C) with clear sky. Humidity is 64% 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 8:13 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 2, 2026 at 8:13 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
