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Roundup, MT Weather Forecast


Roundup, MT Weather Forecast Dated: 510 PM Sat Sep 05 2026
Expect a mild stretch with a mix of sun and clouds and occasional showers over the coming period. moderate humidity and no major pressure swings will dominate.
Saturday, September 5, 2026
Mid-Morning
65°F 18°C
Sunny
Mid-Afternoon
83°F 28°C
Sunny
Early-Evening
76°F 25°C
Sunny
Warm and summery near 83°F 28°C, sunny through the afternoon, turning partly cloudy this evening, with steady humidity and steady pressure. Winds turning from the NNW to the NNE at 12 mph 18 km/h. Gusts up to 20 mph 32 km/h.
Sunday, September 6, 2026
Mid-Morning
67°F 19°C
Cloudy
Mid-Afternoon
82°F 28°C
Sunny
Early-Evening
77°F 25°C
Nearby Thunderstorms
Balmy with temperatures reaching 82°F 28°C, locally heavy thunderstorms at times, with lower humidity and barometric pressure falling. Winds switching from the N to the NNE at 13 mph 21 km/h. Gusts up to 21 mph 34 km/h.
Monday, September 7, 2026
Mid-Morning
66°F 19°C
Sunny
Mid-Afternoon
82°F 28°C
Sunny
Early-Evening
71°F 22°C
Overcast
Quite warm around 82°F 28°C, sunny through the afternoon, turning cloudy this evening, with lower humidity and steady pressure. Winds increasing from the NNE at 7 mph 11 km/h to ENE at 17 mph 28 km/h. Gusts up to 20 mph 31 km/h.
Tuesday, September 8, 2026
Mid-Morning
62°F 17°C
Sunny
Mid-Afternoon
77°F 25°C
Sunny
Early-Evening
71°F 22°C
Sunny
Mild temperatures up to 77°F 25°C, sunny throughout the day, with lower humidity and steady pressure. Winds swinging from the W to the NNE at 9 mph 15 km/h.
Wednesday, September 9, 2026
Mid-Morning
63°F 17°C
Overcast
Mid-Afternoon
80°F 27°C
Sunny
Early-Evening
73°F 23°C
Sunny
Very warm with a high of 80°F 27°C, overcast in the morning, becoming sunny through the afternoon and evening, with lower humidity and barometric pressure falling. Winds shifting from the ESE to the NE at 8 mph 12 km/h.
Thursday, September 10, 2026
Mid-Morning
67°F 19°C
Sunny
Mid-Afternoon
89°F 32°C
Sunny
Early-Evening
79°F 27°C
Sunny
Warm and summery near 89°F 32°C, sunny throughout the day, with steady humidity and barometric pressure falling. Winds turning from the WSW to the N at 10 mph 16 km/h.
Friday, September 11, 2026
Mid-Morning
70°F 21°C
Sunny
Mid-Afternoon
69°F 21°C
Overcast
Early-Evening
61°F 16°C
Overcast
Comfortable with temperatures reaching 69°F 21°C, sunny in the morning, becoming overcast through the afternoon and evening, with increasing humidity and steady pressure. Winds picking up from N at 6 mph 10 km/h to NNE at 19 mph 32 km/h. Gusts up to 21 mph 34 km/h.
Saturday, September 12, 2026
Mid-Morning
50°F 10°C
Scattered Showers
Mid-Afternoon
53°F 12°C
Overcast
Early-Evening
53°F 12°C
Partly Cloudy
Crisp with a high near 53°F 12°C, scattered downpours possible, with lower humidity and steady pressure. Winds moving from the NE to the SE at 4 mph 6 km/h.
Sunday, September 13, 2026
Mid-Morning
53°F 12°C
Overcast
Mid-Afternoon
67°F 20°C
Sunny
Early-Evening
66°F 19°C
Sunny
Refreshing around 67°F 20°C, overcast in the morning, becoming sunny through the afternoon and evening, with lower humidity and barometric pressure falling.
Monday, September 14, 2026
Mid-Morning
62°F 17°C
Partly Cloudy
Mid-Afternoon
77°F 25°C
Sunny
Early-Evening
73°F 23°C
Sunny
Mild with a high of 77°F 25°C, cloudy in the morning, becoming sunny through the afternoon and evening, with lower humidity and steady pressure. Winds swinging from the NW to the ENE at 8 mph 12 km/h.
Tuesday, September 15, 2026
Mid-Morning
69°F 20°C
Sunny
Mid-Afternoon
85°F 29°C
Sunny
Early-Evening
78°F 26°C
Sunny
Warm and summery near 85°F 29°C, sunny throughout the day, with lower humidity and steady pressure. Winds shifting from the WSW to the NE at 5 mph 8 km/h.
Wednesday, September 16, 2026
Mid-Morning
62°F 17°C
Light Showers
Mid-Afternoon
66°F 19°C
Scattered Showers
Early-Evening
62°F 17°C
Scattered Showers
Cool with a high near 66°F 19°C, locally heavy downpours at times, with steady humidity and steady pressure. Winds turning from the ENE to the N at 9 mph 14 km/h.
Thursday, September 17, 2026
Mid-Morning
61°F 16°C
Sunny
Mid-Afternoon
78°F 26°C
Sunny
Early-Evening
73°F 23°C
Overcast
Enjoyable around 78°F 26°C, sunny through the afternoon, turning overcast this evening, with lower humidity and barometric pressure falling. Winds increasing from the SSE at 2 mph 3 km/h to E at 12 mph 19 km/h. Gusts up to 21 mph 33 km/h.
Friday, September 18, 2026
Mid-Morning
68°F 20°C
Overcast
Mid-Afternoon
80°F 27°C
Sunny
Early-Evening
72°F 22°C
Sunny
Warm temperatures up to 80°F 27°C, overcast in the morning, becoming sunny through the afternoon and evening, with lower humidity and steady pressure. Winds moving from the W to the NNW at 10 mph 16 km/h.
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