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Arrow Lake, MT Weather Forecast
Arrow Lake, MT Weather Forecast Dated: 807 PM Wed Sep 09 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.
Wednesday, September 9, 2026
Mid-Morning
49°F 9°C
Sunny
Mid-Afternoon
64°F 18°C
Sunny
Early-Evening
54°F 13°C
Sunny
Refreshing around 64°F 18°C, sunny throughout the day, with lower humidity and barometric pressure falling. Winds turning from the SSW to the WSW at 7 mph 11 km/h.
Thursday, September 10, 2026
Mid-Morning
51°F 11°C
Sunny
Mid-Afternoon
69°F 21°C
Sunny
Early-Evening
58°F 15°C
Sunny
Comfortable with temperatures reaching 69°F 21°C, sunny throughout the day, with steady humidity and barometric pressure falling. Winds switching from the S to the SSW at 8 mph 12 km/h.
Friday, September 11, 2026
Mid-Morning
51°F 10°C
Sunny
Mid-Afternoon
61°F 16°C
Cloudy
Early-Evening
49°F 10°C
Cloudy
Comfortable at 61°F 16°C, sunny in the morning, becoming overcast through the afternoon and evening, with increasing humidity and steady pressure. Winds moving from the WSW to the NE at 6 mph 10 km/h.
Saturday, September 12, 2026
Mid-Morning
42°F 6°C
Overcast
Mid-Afternoon
61°F 16°C
Overcast
Early-Evening
45°F 7°C
Overcast
Cool with a high near 61°F 16°C, overcast throughout the day, with steady humidity and barometric pressure falling.
Sunday, September 13, 2026
Mid-Morning
37°F 3°C
Light Snow Showers
Mid-Afternoon
36°F 2°C
Heavy Snow Showers
Early-Evening
33°F 1°C
Heavy Snow Showers
Biting cold near 36°F 2°C, persistent snow off and on through the day, with increasing humidity and barometric pressure rising. New snow accumulation of 1 to 4 in. 3 to 10 cm. Winds swinging from the S to the NNW at 4 mph 7 km/h.
Monday, September 14, 2026
Mid-Morning
35°F 2°C
Sunny
Mid-Afternoon
54°F 12°C
Sunny
Early-Evening
45°F 7°C
Sunny
Cool and brisk at 54°F 12°C, sunny throughout the day, with lower humidity and barometric pressure falling.
Tuesday, September 15, 2026
Mid-Morning
43°F 6°C
Sunny
Mid-Afternoon
61°F 16°C
Sunny
Early-Evening
48°F 9°C
Overcast
Comfortable at 61°F 16°C, sunny through the afternoon, turning cloudy this evening, with steady humidity and steady pressure. Winds shifting from the SSE to the NNE at 4 mph 6 km/h.
Wednesday, September 16, 2026
Mid-Morning
42°F 6°C
Sunny
Mid-Afternoon
66°F 19°C
Overcast
Early-Evening
53°F 11°C
Partly Cloudy
Cool with a high near 66°F 19°C, sunny in the morning, overcast in the afternoon, and cloudy this evening, with lower humidity and steady pressure.
Thursday, September 17, 2026
Mid-Morning
53°F 12°C
Sunny
Mid-Afternoon
71°F 21°C
Overcast
Early-Evening
60°F 16°C
Sunny
Mild temperatures up to 71°F 21°C, sunny in the morning, overcast in the afternoon, and cloudy this evening, with steady humidity and barometric pressure falling. Winds turning from the S to the SSW at 8 mph 13 km/h. Gusts up to 21 mph 35 km/h.
Friday, September 18, 2026
Mid-Morning
57°F 14°C
Overcast
Mid-Afternoon
72°F 22°C
Overcast
Early-Evening
57°F 14°C
Nearby Thunderstorms
Mild with a high of 72°F 22°C, periods of heavy thunderstorms, with increasing humidity and steady pressure. Winds out of the SSW at 12 mph 19 km/h.
Saturday, September 19, 2026
Mid-Morning
52°F 11°C
Sunny
Mid-Afternoon
65°F 18°C
Sunny
Early-Evening
53°F 12°C
Overcast
Comfortable at 65°F 18°C, sunny through the afternoon, turning partly cloudy this evening, with lower humidity and steady pressure. Winds moving from the SSE to the NNE at 7 mph 11 km/h.
Sunday, September 20, 2026
Mid-Morning
45°F 7°C
Sunny
Mid-Afternoon
54°F 12°C
Scattered Showers
Early-Evening
45°F 7°C
Scattered Showers
Crisp with a high near 54°F 12°C, locally heavy downpours at times, with increasing humidity and steady pressure.
Monday, September 21, 2026
Mid-Morning
47°F 8°C
Sunny
Mid-Afternoon
65°F 19°C
Sunny
Early-Evening
55°F 13°C
Sunny
Refreshing around 65°F 19°C, sunny throughout the day, with lower humidity and barometric pressure falling.
Tuesday, September 22, 2026
Mid-Morning
53°F 11°C
Sunny
Mid-Afternoon
72°F 22°C
Sunny
Early-Evening
60°F 16°C
Overcast
Mild temperatures up to 72°F 22°C, sunny through the afternoon, turning overcast this evening, with steady humidity and barometric pressure falling.
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