National Weather Service

News Headlines

SCN26-50: Discontinuation of the State Forecast Product (SFP) for all NWS Central Region, Southern Region, and Western Region Offices: Effective June 29, 2026
The Regional Temperatures and Precipitation Product for the State of Montana (RTPMT) will now be discontinued on July 7, 2026.

Hazardous Weather Conditions

Flood Watch until June 30, 12:00 AM MDT

Current conditions at

USCRN SITE NEAR ST. MARY 1SSW (MRYM8)

Lat: 48.74111°NLon: 113.43306°WElev: 4550.0ft.

53°F

12°C

Humidity	81%
Wind Speed	NA 2 MPH
Barometer	NA
Dewpoint	47°F (8°C)
Visibility	NA
Last update	29 Jun 04:10 PM MDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

St Mary MT

Flood Watch June 29, 04:38pm until June 30, 12:00am

Click here for hazard details and duration

Flood Watch

Flood Watch June 29, 04:38pm until June 30, 12:00am
NOW until 12:00am Tue
Flood Watch
This Afternoon
High: 59 °F
Showers
Tonight
Low: 46 °F
Showers then
Chance
Showers
Tuesday
High: 66 °F
Mostly Sunny
then Chance
Showers
Tuesday Night
Low: 47 °F
Partly Cloudy
Wednesday
High: 67 °F
Mostly Sunny
Wednesday Night
Low: 44 °F
Mostly Clear
Thursday
High: 68 °F
Sunny
Thursday Night
Low: 45 °F
Partly Cloudy

Detailed Forecast

This Afternoon

Showers and possibly a thunderstorm. High near 59. North northwest wind around 10 mph, with gusts as high as 22 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Tonight

Showers and thunderstorms before 1am, then a slight chance of showers between 1am and 2am. Low around 46. North northwest wind 5 to 9 mph becoming west southwest after midnight. Winds could gust as high as 22 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Tuesday

A 30 percent chance of showers and thunderstorms, mainly between 1pm and 3pm. Mostly sunny, with a high near 66. West southwest wind 7 to 11 mph, with gusts as high as 23 mph.

Tuesday Night

Partly cloudy, with a low around 47. West southwest wind around 9 mph, with gusts as high as 22 mph.

Wednesday

Mostly sunny, with a high near 67. West southwest wind 8 to 10 mph, with gusts as high as 21 mph.

Wednesday Night

Mostly clear, with a low around 44. Southwest wind 6 to 9 mph, with gusts as high as 20 mph.

Thursday

Sunny, with a high near 68. West southwest wind 6 to 11 mph, with gusts as high as 23 mph.

Thursday Night

Partly cloudy, with a low around 45. Southwest wind 5 to 9 mph.

Friday

Mostly sunny, with a high near 68.