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Fort Harrison, MT Weather Forecast
Fort Harrison, MT Weather Forecast Dated: 1249 PM Tue Sep 08 2026
Expect a cool pattern with a mix of sun and clouds and occasional showers over the coming period. moderate humidity and no major pressure swings will dominate.
Tuesday, September 8, 2026
Mid-Morning
49°F 10°C
Scattered Showers
Mid-Afternoon
50°F 10°C
Light Showers
Early-Evening
48°F 9°C
Scattered Showers
Brisk around 50°F 10°C, periods of heavy rain and gusty conditions, with steady humidity and steady pressure. Winds out of the NW at 9 mph 14 km/h.
Wednesday, September 9, 2026
Mid-Morning
44°F 7°C
Overcast
Mid-Afternoon
65°F 18°C
Sunny
Early-Evening
58°F 15°C
Sunny
Mildly cool near 65°F 18°C, overcast in the morning, becoming sunny through the afternoon and evening, with lower humidity and barometric pressure falling. Winds building from WSW at 9 mph 14 km/h to W at 19 mph 29 km/h. Gusts up to 37 mph 59 km/h.
Thursday, September 10, 2026
Mid-Morning
57°F 14°C
Overcast
Mid-Afternoon
65°F 18°C
Partly Cloudy
Early-Evening
56°F 13°C
Sunny
Comfortable at 65°F 18°C, overcast in the morning, partly cloudy in the afternoon, and sunny this evening, with increasing humidity and steady pressure. Winds W at 19 mph 31 km/h. Gusts up to 26 mph 42 km/h.
Friday, September 11, 2026
Mid-Morning
43°F 6°C
Overcast
Mid-Afternoon
56°F 13°C
Cloudy
Early-Evening
52°F 11°C
Sunny
Crisp with a high near 56°F 13°C, overcast in the morning, cloudy in the afternoon, and partly cloudy this evening, with lower humidity and barometric pressure falling. Winds out of the ENE at 8 mph 13 km/h.
Saturday, September 12, 2026
Mid-Morning
41°F 5°C
Light Fog
Mid-Afternoon
40°F 4°C
Scattered Showers
Early-Evening
38°F 3°C
Scattered Showers
Biting cold near 40°F 4°C, scattered downpours possible, with steady humidity and barometric pressure rising.
Sunday, September 13, 2026
Mid-Morning
35°F 2°C
Heavy Snow Showers
Mid-Afternoon
36°F 2°C
Fog
Early-Evening
35°F 2°C
Scattered Showers
Cold with a high near 36°F 2°C, blowing snow reducing visibility at times, with steady humidity and steady pressure. New snow accumulation of 3 to 6 in. 8 to 15 cm.
Monday, September 14, 2026
Mid-Morning
38°F 3°C
Sunny
Mid-Afternoon
56°F 13°C
Sunny
Early-Evening
50°F 10°C
Sunny
Chilly near 56°F 13°C, sunny throughout the day, with lower humidity and steady pressure. Winds shifting from the W to the WSW at 5 mph 8 km/h.
Tuesday, September 15, 2026
Mid-Morning
46°F 8°C
Sunny
Mid-Afternoon
61°F 16°C
Sunny
Early-Evening
54°F 12°C
Sunny
Cool with a high near 61°F 16°C, sunny in the morning, partly cloudy in the afternoon, and sunny this evening, with lower humidity and barometric pressure falling. Winds S at 8 mph 13 km/h.
Wednesday, September 16, 2026
Mid-Morning
51°F 11°C
Overcast
Mid-Afternoon
57°F 14°C
Nearby Thunderstorms
Early-Evening
51°F 11°C
Scattered Showers
Brisk around 57°F 14°C, heavy thunderstorms conditions at times, with increasing humidity and barometric pressure rising.
Thursday, September 17, 2026
Mid-Morning
50°F 10°C
Sunny
Mid-Afternoon
46°F 8°C
Scattered Showers
Early-Evening
36°F 3°C
Scattered Showers
Cool and brisk at 46°F 8°C, periods of heavy rain and gusty conditions, with increasing humidity and barometric pressure rising. Winds switching from the W to the E at 7 mph 11 km/h.
Friday, September 18, 2026
Mid-Morning
31°F 0°C
Heavy Snow Showers
Mid-Afternoon
34°F 1°C
Light Snow Showers
Early-Evening
34°F 1°C
Scattered Showers
Biting cold near 34°F 1°C, patchy blowing snow and gusty conditions, with steady humidity and steady pressure.
Saturday, September 19, 2026
Mid-Morning
39°F 4°C
Sunny
Mid-Afternoon
61°F 16°C
Sunny
Early-Evening
50°F 10°C
Sunny
Cool with a high near 61°F 16°C, sunny throughout the day, with lower humidity and barometric pressure falling. Winds moving from the W to the WSW at 8 mph 12 km/h.
Sunday, September 20, 2026
Mid-Morning
45°F 7°C
Sunny
Mid-Afternoon
66°F 19°C
Sunny
Early-Evening
55°F 13°C
Sunny
Refreshing around 66°F 19°C, sunny throughout the day, with lower humidity and barometric pressure falling. Winds swinging from the W to the WSW at 10 mph 16 km/h.
Monday, September 21, 2026
Mid-Morning
49°F 9°C
Sunny
Mid-Afternoon
70°F 21°C
Sunny
Early-Evening
58°F 14°C
Overcast
Mild temperatures up to 70°F 21°C, sunny through the afternoon, turning cloudy this evening, with steady humidity and steady pressure. Winds shifting from the W to the WSW at 11 mph 18 km/h. Gusts up to 21 mph 35 km/h.
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