Weather WorldO'Brien Lake, MT Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
O'Brien Lake Weather Forecast
| TONIGHT | SUNDAY | SUNDAY NIGHT | COLUMBUS DAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY |
 | |  |  | |  |  | | | | | |
| Snow | Chance of Snow | Clearing | Patchy Fog | Fog | Mostly Sunny | Mostly Clear | Mostly Sunny | Partly Cloudy | Mostly Sunny | Mostly Clear | Mostly Sunny |
| Lo: 26°FLo: -3°C | Hi: 45°FHi: 7°C | Lo: 25°FLo: -4°C | Hi: 50°FHi: 10°C | Lo: 25°FLo: -4°C | Hi: 56°FHi: 13°C | Lo: 26°FLo: -3°C | Hi: 56°FHi: 13°C | Lo: 30°FLo: -1°C | Hi: 60°FHi: 16°C | Lo: 30°FLo: -1°C | Hi: 60°FHi: 16°C |
| POP: 50% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 206 PM MDT Sat Oct 10 2026 
O'Brien Lake Radar Loop
Use the map search tool if you want to place a location marker on the radar map...
O'Brien Lake Weather Map
O'Brien Lake Quick Facts
O'Brien Lake Forecast Discussion
Meteorlogic Glosserator
Instant definitions for any meteorological term.
Instant definitions for any meteorological term.
Issued: 1248 PM MDT Sat Oct 10 2026
Discussion
...
KEY MESSAGES:- Cold, wet conditions through Monday morning and a winter storm for the front range and southwest Montana.
- Hard freeze potential early next week.
- Warming up to above normal late next week.
Overview & Winter Impacts: An upper-level trough settling over the Pacific Northwest will advect moisture across the Northern Rockies. Concurrently, a cold front is gradually spilling over the Continental Divide, driving gusty east-to-northeast winds and pushing much colder air south a...