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St. Mary, MT Weather Forecast
St. Mary, MT Weather Forecast Dated: 714 AM Wed Sep 09 2026
Expect a cool pattern with more clouds than sun and frequent chances of rain over the coming period. generally humid conditions and a stable pattern will dominate.
Wednesday, September 9, 2026
Mid-Morning
51°F 11°C
Sunny
Mid-Afternoon
63°F 17°C
Sunny
Early-Evening
58°F 15°C
Overcast
Refreshing around 63°F 17°C, sunny through the afternoon, turning overcast this evening, with steady humidity and barometric pressure falling. Winds out of the WSW at 17 mph 27 km/h. Gusts up to 22 mph 35 km/h.
Thursday, September 10, 2026
Mid-Morning
54°F 12°C
Overcast
Mid-Afternoon
67°F 20°C
Cloudy
Early-Evening
50°F 10°C
Overcast
Mildly cool near 67°F 20°C, overcast in the morning, cloudy in the afternoon, and overcast this evening, with increasing humidity and steady pressure. Winds switching from the SW to the N at 10 mph 16 km/h.
Friday, September 11, 2026
Mid-Morning
36°F 2°C
Heavy Snow Showers
Mid-Afternoon
47°F 8°C
Scattered Showers
Early-Evening
44°F 7°C
Scattered Showers
Chilly near 47°F 8°C, blowing snow reducing visibility at times, with lower humidity and steady pressure. Snow accumulation up to 1 in. up to 3 cm. Winds moving from the NW to the E at 7 mph 10 km/h.
Saturday, September 12, 2026
Mid-Morning
40°F 5°C
Overcast
Mid-Afternoon
45°F 7°C
Scattered Showers
Early-Evening
44°F 7°C
Overcast
Crisp with a high near 45°F 7°C, periods of heavy rain and gusty conditions, with steady humidity and steady pressure. Winds swinging from the ESE to the ENE at 7 mph 12 km/h.
Sunday, September 13, 2026
Mid-Morning
40°F 4°C
Scattered Showers
Mid-Afternoon
43°F 6°C
Scattered Showers
Early-Evening
44°F 7°C
Scattered Showers
Biting cold near 43°F 6°C, scattered downpours possible, with lower humidity and steady pressure.
Monday, September 14, 2026
Mid-Morning
42°F 6°C
Sunny
Mid-Afternoon
60°F 16°C
Sunny
Early-Evening
54°F 12°C
Sunny
Mildly cool near 60°F 16°C, sunny throughout the day, with lower humidity and steady pressure. Winds blowing from the WNW at 6 mph 9 km/h.
Tuesday, September 15, 2026
Mid-Morning
41°F 5°C
Scattered Showers
Mid-Afternoon
40°F 5°C
Scattered Showers
Early-Evening
42°F 5°C
Scattered Showers
Nippy around 40°F 5°C, periods of heavy rain and gusty conditions, with lower humidity and steady pressure. Winds turning from the N to the NE at 5 mph 7 km/h.
Wednesday, September 16, 2026
Mid-Morning
36°F 2°C
Light Snow Showers
Mid-Afternoon
36°F 2°C
Light Snow Showers
Early-Evening
33°F 1°C
Light Snow Showers
Biting cold near 36°F 2°C, persistent snow off and on through the day, with steady humidity and barometric pressure rising. Winds out of the N at 8 mph 13 km/h.
Thursday, September 17, 2026
Mid-Morning
27°F -3°C
Heavy Snow Showers
Mid-Afternoon
31°F -1°C
Ice Pellets
Early-Evening
32°F 0°C
Heavy Freezing Drizzle
Frigid with highs around 31°F -1°C, on-and-off snow throughout the day, with steady humidity and steady pressure. Winds moving from the NNW to the E at 6 mph 9 km/h.
Friday, September 18, 2026
Mid-Morning
33°F 1°C
Light Snow Showers
Mid-Afternoon
34°F 1°C
Light Snow Showers
Early-Evening
34°F 1°C
Light Snow Showers
Nippy around 34°F 1°C, rounds of snow expected off and on all day, with steady humidity and steady pressure.
Saturday, September 19, 2026
Mid-Morning
30°F -1°C
Heavy Snow Showers
Mid-Afternoon
32°F 0°C
Heavy Snow Showers
Early-Evening
29°F -2°C
Light Snow Showers
Biting cold near 32°F 0°C, persistent snow off and on through the day, with steady humidity and steady pressure. New snow accumulation of 4 to 7 in. 10 to 18 cm.
Sunday, September 20, 2026
Mid-Morning
29°F -2°C
Light Snow Showers
Mid-Afternoon
33°F 0°C
Light Snow Showers
Early-Evening
33°F 0°C
Heavy Snow Showers
Cold with a high near 33°F 0°C, on-and-off snow throughout the day, with steady humidity and steady pressure.
Monday, September 21, 2026
Mid-Morning
32°F 0°C
Fog
Mid-Afternoon
37°F 3°C
Scattered Showers
Early-Evening
38°F 4°C
Scattered Showers
Nippy around 37°F 3°C, periods of heavy rain and gusty conditions, with steady humidity and steady pressure.
Tuesday, September 22, 2026
Mid-Morning
36°F 2°C
Light Fog
Mid-Afternoon
45°F 7°C
Scattered Showers
Early-Evening
44°F 7°C
Scattered Showers
Cool and brisk at 45°F 7°C, scattered downpours possible, with steady humidity and steady pressure.
St. Mary, MT Weather Radar Map
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