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Roundup MT Weather - Mostly Clear - 81°F
Mostly Clear
81°F
Updated 5:10 pm
Feels Like 73°F
Humidity 23%
Wind ENE 13 mph
Barometer  30.01 in
Dew Point 40°F
Roundup MT Weather - Mostly Clear - 27°C
Mostly Clear
27°C
Updated 5:10 pm
Feels Like 23°C
Humidity 23%
Wind ENE 21 km/h
Barometer  101.6 kPa
Dew Point 4°C
Roundup, MT Weather and Current Conditionsroundup mt weather forecast

Roundup, MT Weather Forecast

Roundup Montana WeatherRoundup, Montana Weather Weather Forecast
14 Day API Roundup, MT Weather Forecast. Note: Our 7 day Roundup, Montana weather forecast is our most reliable, and specific forecast. This model should only be used as a probable scenario. Forecasting more than 7 days ahead is challenging.
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
Roundup Weather - 2026-09-05 - Morning - Sunny
65°F 18°C
Sunny
Mid-Afternoon
Roundup Weather - 2026-09-05 - Afternoon - Sunny
83°F 28°C
Sunny
Early-Evening
Roundup Weather - 2026-09-05 - Evening - Sunny
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
Roundup Weather - 2026-09-06 - Morning - Cloudy
67°F 19°C
Cloudy
Mid-Afternoon
Roundup Weather - 2026-09-06 - Afternoon - Sunny
82°F 28°C
Sunny
Early-Evening
Roundup Weather - 2026-09-06 - Evening - Nearby Thunderstorms
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
Roundup Weather - 2026-09-07 - Morning - Sunny
66°F 19°C
Sunny
Mid-Afternoon
Roundup Weather - 2026-09-07 - Afternoon - Sunny
82°F 28°C
Sunny
Early-Evening
Roundup Weather - 2026-09-07 - Evening - Overcast
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
Roundup Weather - 2026-09-08 - Morning - Sunny
62°F 17°C
Sunny
Mid-Afternoon
Roundup Weather - 2026-09-08 - Afternoon - Sunny
77°F 25°C
Sunny
Early-Evening
Roundup Weather - 2026-09-08 - Evening - Sunny
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
Roundup Weather - 2026-09-09 - Morning - Overcast
63°F 17°C
Overcast
Mid-Afternoon
Roundup Weather - 2026-09-09 - Afternoon - Sunny
80°F 27°C
Sunny
Early-Evening
Roundup Weather - 2026-09-09 - Evening - Sunny
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
Roundup Weather - 2026-09-10 - Morning - Sunny
67°F 19°C
Sunny
Mid-Afternoon
Roundup Weather - 2026-09-10 - Afternoon - Sunny
89°F 32°C
Sunny
Early-Evening
Roundup Weather - 2026-09-10 - Evening - Sunny
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
Roundup Weather - 2026-09-11 - Morning - Sunny
70°F 21°C
Sunny
Mid-Afternoon
Roundup Weather - 2026-09-11 - Afternoon - Overcast
69°F 21°C
Overcast
Early-Evening
Roundup Weather - 2026-09-11 - Evening - Overcast
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
Roundup Weather - 2026-09-12 - Morning - Scattered Showers
50°F 10°C
Scattered Showers
Mid-Afternoon
Roundup Weather - 2026-09-12 - Afternoon - Overcast
53°F 12°C
Overcast
Early-Evening
Roundup Weather - 2026-09-12 - Evening - Partly Cloudy
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
Roundup Weather - 2026-09-13 - Morning - Overcast
53°F 12°C
Overcast
Mid-Afternoon
Roundup Weather - 2026-09-13 - Afternoon - Sunny
67°F 20°C
Sunny
Early-Evening
Roundup Weather - 2026-09-13 - Evening - Sunny
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
Roundup Weather - 2026-09-14 - Morning - Partly Cloudy
62°F 17°C
Partly Cloudy
Mid-Afternoon
Roundup Weather - 2026-09-14 - Afternoon - Sunny
77°F 25°C
Sunny
Early-Evening
Roundup Weather - 2026-09-14 - Evening - Sunny
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
Roundup Weather - 2026-09-15 - Morning - Sunny
69°F 20°C
Sunny
Mid-Afternoon
Roundup Weather - 2026-09-15 - Afternoon - Sunny
85°F 29°C
Sunny
Early-Evening
Roundup Weather - 2026-09-15 - Evening - Sunny
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
Roundup Weather - 2026-09-16 - Morning - Light Showers
62°F 17°C
Light Showers
Mid-Afternoon
Roundup Weather - 2026-09-16 - Afternoon - Scattered Showers
66°F 19°C
Scattered Showers
Early-Evening
Roundup Weather - 2026-09-16 - Evening - Scattered Showers
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
Roundup Weather - 2026-09-17 - Morning - Sunny
61°F 16°C
Sunny
Mid-Afternoon
Roundup Weather - 2026-09-17 - Afternoon - Sunny
78°F 26°C
Sunny
Early-Evening
Roundup Weather - 2026-09-17 - Evening - Overcast
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
Roundup Weather - 2026-09-18 - Morning - Overcast
68°F 20°C
Overcast
Mid-Afternoon
Roundup Weather - 2026-09-18 - Afternoon - Sunny
80°F 27°C
Sunny
Early-Evening
Roundup Weather - 2026-09-18 - Evening - Sunny
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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Weather by the Numbers

Sat, 5th
Roundup MT Weather - Saturday, Sep 5, 2026 - Sunny
Hi: 83°F 28°C
Lo: 57°F 14°C
Sunrise 06:39 AM
Sunset 07:45 PM
Wind NNE 13 mph21 km/h
Dew Point 40°F4°C
uv Index 6
Barometric Pressure 29.91 in1013 mb
POP 0% *
Humidity 26%
Sun, 6th
Roundup MT Weather - Sunday, Sep 6, 2026 - Sunny
Hi: 82°F 28°C
Lo: 59°F 15°C
Sunrise 06:41 AM
Sunset 07:43 PM
Wind NNE 10 mph15 km/h
Dew Point 55°F13°C
uv Index 6
Barometric Pressure 29.85 in1011 mb
POP 2% *
Humidity 47%
Mon, 7th
Roundup MT Weather - Monday, Sep 7, 2026 - Sunny
Hi: 82°F 28°C
Lo: 58°F 14°C
Sunrise 06:42 AM
Sunset 07:41 PM
Wind SW 5 mph8 km/h
Dew Point 49°F9°C
uv Index 6
Barometric Pressure 29.71 in1006 mb
POP 1% *
Humidity 39%
Tue, 8th
Roundup MT Weather - Tuesday, Sep 8, 2026 - Sunny
Hi: 78°F 26°C
Lo: 55°F 13°C
Sunrise 06:43 AM
Sunset 07:39 PM
Wind W 18 mph29 km/h
Dew Point 35°F2°C
uv Index 5
Barometric Pressure 29.97 in1015 mb
POP 0% *
Humidity 26%
Wed, 9th
Roundup MT Weather - Wednesday, Sep 9, 2026 - Sunny
Hi: 81°F 27°C
Lo: 54°F 12°C
Sunrise 06:45 AM
Sunset 07:37 PM
Wind SW 11 mph17 km/h
Dew Point 37°F3°C
uv Index 5
Barometric Pressure 30.09 in1019 mb
POP 0% *
Humidity 26%
Thu, 10th
Roundup MT Weather - Thursday, Sep 10, 2026 - Cloudy
Hi: 89°F 32°C
Lo: 59°F 15°C
Sunrise 06:46 AM
Sunset 07:36 PM
Wind WSW 18 mph30 km/h
Dew Point 30°F-1°C
uv Index 6
Barometric Pressure 29.85 in1011 mb
POP 5% *
Humidity 16%
Fri, 11th
Roundup MT Weather - Friday, Sep 11, 2026 - Sunny
Hi: 70°F 21°C
Lo: 55°F 13°C
Sunrise 06:47 AM
Sunset 07:34 PM
Wind N 19 mph31 km/h
Dew Point 47°F9°C
uv Index 6
Barometric Pressure 29.85 in1011 mb
POP 2% *
Humidity 45%
Sat, 12th
Roundup MT Weather - Saturday, Sep 12, 2026 - Patchy Rain Nearby
Hi: 54°F 12°C
Lo: 50°F 10°C
Sunrise 06:48 AM
Sunset 07:32 PM
Wind NE 9 mph14 km/h
Dew Point 43°F6°C
uv Index 3
Barometric Pressure 30.06 in1018 mb
POP 23% *
Humidity 74%
Sun, 13th
Roundup MT Weather - Sunday, Sep 13, 2026 - Cloudy
Hi: 70°F 21°C
Lo: 50°F 10°C
Sunrise 06:50 AM
Sunset 07:30 PM
Wind SE 6 mph10 km/h
Dew Point 43°F6°C
uv Index 4
Barometric Pressure 30.09 in1019 mb
POP 8% *
Humidity 53%
Mon, 14th
Roundup MT Weather - Monday, Sep 14, 2026 - Sunny
Hi: 77°F 25°C
Lo: 53°F 12°C
Sunrise 06:51 AM
Sunset 07:28 PM
Wind NNE 2 mph3 km/h
Dew Point 48°F9°C
uv Index 6
Barometric Pressure 29.94 in1014 mb
POP 1% *
Humidity 43%
Tue, 15th
Roundup MT Weather - Tuesday, Sep 15, 2026 - Sunny
Hi: 85°F 30°C
Lo: 60°F 16°C
Sunrise 06:52 AM
Sunset 07:26 PM
Wind SW 8 mph12 km/h
Dew Point 47°F8°C
uv Index 7
Barometric Pressure 29.94 in1014 mb
POP 1% *
Humidity 31%
Wed, 16th
Roundup MT Weather - Wednesday, Sep 16, 2026 - Light Rain Shower
Hi: 66°F 19°C
Lo: 58°F 14°C
Sunrise 06:54 AM
Sunset 07:24 PM
Wind E 9 mph15 km/h
Dew Point 59°F15°C
uv Index 4
Barometric Pressure 30.03 in1017 mb
POP 72% *
Humidity 86%
Thu, 17th
Roundup MT Weather - Thursday, Sep 17, 2026 - Sunny
Hi: 78°F 26°C
Lo: 55°F 13°C
Sunrise 06:55 AM
Sunset 07:22 PM
Wind SE 4 mph7 km/h
Dew Point 54°F12°C
uv Index 6
Barometric Pressure 29.97 in1015 mb
POP 3% *
Humidity 55%
Fri, 18th
Roundup MT Weather - Friday, Sep 18, 2026 - Sunny
Hi: 80°F 27°C
Lo: 63°F 17°C
Sunrise 06:56 AM
Sunset 07:20 PM
Wind WSW 14 mph23 km/h
Dew Point 45°F7°C
uv Index 6
Barometric Pressure 29.77 in1008 mb
POP 1% *
Humidity 33%
* POP = Probability of Precipitation. Data for 12:00 PM.