October in Montana is cool and dry: NOAA's 1991–2020 normals for Missoula International Airport give an average high of 55.7°F, a low of 32.4°F and 1.18 inches of precipitation, while Helena's normals are a 57.6°F high and a 33.5°F low. The first snow shows up (0.9 inches at Missoula, 2.8 at Helena). This page is a dated monthly snapshot reviewed October 20, 2026, not live weather or a live events feed.
Montana this month
A dated monthly snapshot of Montana weather normals and verified event dates.
This month at a glance
| Topic | Detail |
|---|---|
| Missoula high / low | 55.7°F / 32.4°F (NOAA 1991–2020); 1.18 inches; 0.9 in snow |
| Helena high / low | 57.6°F / 33.5°F; 0.78 inches; 2.8 in snow |
| Notes | Glacier's winter vehicle rate starts November 1 |
For live conditions use the National Weather Service. See the events page.
How this page is maintained
We update it monthly; last review October 20, 2026. Between reviews it may be out of date.
Weather and what to wear
NOAA monthly normals.
Climate table →
This week
Verified schedule notes.
Events →
Seasonal picks
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Best time to visit →
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Compare regions →Frequently asked questions
Is this page updated daily?
No. It is a monthly snapshot.
Where do the numbers come from?
NOAA NCEI climate normals and the agencies; see sources below.
What should I wear in October?
NOAA's normals suggest cool days and freezing nights; bring warm layers.
Sources
Facts on this page were read from the sources below on October 20, 2026. Hours, fares, prices and event dates change — confirm with the source before you travel. How we research and update.
- U.S. Climate Normals 1991-2020, Missoula International Airport (USW00024153) — NOAA National Centers for Environmental Information
- Fees & Passes, Glacier National Park — National Park Service