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Sweet Grass, MT Weather Forecast
Sweet Grass, MT Weather Forecast Dated: 1027 PM Fri Sep 11 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.
Friday, September 11, 2026
Mid-Morning
47°F 8°C
Rain
Mid-Afternoon
53°F 12°C
Scattered Showers
Early-Evening
52°F 12°C
Scattered Showers
Brisk around 53°F 12°C, periods of heavy rain and gusty conditions, with lower humidity and steady pressure. Winds turning from the NNE to the NNW at 8 mph 13 km/h.
Saturday, September 12, 2026
Mid-Morning
46°F 8°C
Overcast
Mid-Afternoon
51°F 10°C
Overcast
Early-Evening
51°F 11°C
Overcast
Cool and brisk at 51°F 10°C, overcast through the afternoon, turning cloudy this evening, with lower humidity and steady pressure.
Sunday, September 13, 2026
Mid-Morning
48°F 9°C
Cloudy
Mid-Afternoon
62°F 16°C
Cloudy
Early-Evening
53°F 12°C
Scattered Showers
Comfortable at 62°F 16°C, locally heavy downpours at times, with steady humidity and barometric pressure falling. Winds switching from the SE to the SW at 12 mph 20 km/h. Gusts up to 20 mph 33 km/h.
Monday, September 14, 2026
Mid-Morning
46°F 8°C
Light Showers
Mid-Afternoon
54°F 12°C
Scattered Showers
Early-Evening
53°F 12°C
Overcast
Crisp with a high near 54°F 12°C, periods of heavy rain and gusty conditions, with lower humidity and barometric pressure rising. Winds decreasing from WNW 28 mph 45 km/h to W 7 mph 12 km/h.
Tuesday, September 15, 2026
Mid-Morning
45°F 7°C
Light Showers
Mid-Afternoon
46°F 8°C
Scattered Showers
Early-Evening
45°F 7°C
Light Showers
Brisk around 46°F 8°C, scattered downpours possible, with steady humidity and steady pressure. Winds swinging from the NNE to the NE at 7 mph 11 km/h.
Wednesday, September 16, 2026
Mid-Morning
46°F 8°C
Sunny
Mid-Afternoon
62°F 17°C
Sunny
Early-Evening
59°F 15°C
Overcast
Mildly cool near 62°F 17°C, sunny through the afternoon, turning overcast this evening, with lower humidity and barometric pressure falling. Winds shifting from the SSW to the S at 10 mph 16 km/h. Gusts up to 20 mph 32 km/h.
Thursday, September 17, 2026
Mid-Morning
56°F 13°C
Sunny
Mid-Afternoon
70°F 21°C
Sunny
Early-Evening
66°F 19°C
Sunny
Comfortable with temperatures reaching 70°F 21°C, sunny throughout the day, with lower humidity and steady pressure.
Friday, September 18, 2026
Mid-Morning
58°F 15°C
Sunny
Mid-Afternoon
70°F 21°C
Sunny
Early-Evening
66°F 19°C
Sunny
Enjoyable around 70°F 21°C, sunny throughout the day, with steady humidity and steady pressure. Winds turning from the S to the SSE at 7 mph 12 km/h.
Saturday, September 19, 2026
Mid-Morning
59°F 15°C
Sunny
Mid-Afternoon
72°F 22°C
Sunny
Early-Evening
67°F 20°C
Sunny
Mild temperatures up to 72°F 22°C, sunny throughout the day, with steady humidity and steady pressure.
Sunday, September 20, 2026
Mid-Morning
60°F 15°C
Sunny
Mid-Afternoon
72°F 22°C
Sunny
Early-Evening
68°F 20°C
Sunny
Mild with a high of 72°F 22°C, sunny throughout the day, with lower humidity and steady pressure.
Monday, September 21, 2026
Mid-Morning
59°F 15°C
Partly Cloudy
Mid-Afternoon
75°F 24°C
Sunny
Early-Evening
70°F 21°C
Overcast
Pleasant near 75°F 24°C, partly cloudy in the morning, sunny in the afternoon, and overcast this evening, with lower humidity and steady pressure.
Tuesday, September 22, 2026
Mid-Morning
60°F 16°C
Partly Cloudy
Mid-Afternoon
73°F 23°C
Sunny
Early-Evening
69°F 21°C
Sunny
Comfortable with temperatures reaching 73°F 23°C, cloudy in the morning, partly cloudy in the afternoon, and sunny this evening, with lower humidity and steady pressure.
Wednesday, September 23, 2026
Mid-Morning
59°F 15°C
Sunny
Mid-Afternoon
78°F 25°C
Sunny
Early-Evening
71°F 22°C
Sunny
Enjoyable around 78°F 25°C, sunny throughout the day, with lower humidity and barometric pressure falling. Winds switching from the SSW to the SE at 10 mph 16 km/h.
Thursday, September 24, 2026
Mid-Morning
50°F 10°C
Light Showers
Mid-Afternoon
57°F 14°C
Overcast
Early-Evening
54°F 12°C
Overcast
Cool and brisk at 57°F 14°C, scattered morning showers before drying out later, with lower humidity and barometric pressure rising. Winds moving from the NW to the NNW at 14 mph 22 km/h. Gusts up to 20 mph 32 km/h.
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