Jack Downs Reservoir, MT 14 Day Weather
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Jack Downs Reservoir, MT Weather Forecast


Jack Downs Reservoir, MT Weather Forecast Dated: 1214 PM Fri Sep 18 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 18, 2026
Mid-Morning
65°F 18°C
Sunny
Mid-Afternoon
81°F 27°C
Sunny
Early-Evening
76°F 24°C
Sunny
Warm and summery near 81°F 27°C, sunny through the afternoon, turning cloudy this evening, with lower humidity and steady pressure. Winds turning from the SSE to the NNE at 10 mph 17 km/h. Gusts up to 21 mph 34 km/h.
Saturday, September 19, 2026
Mid-Morning
60°F 16°C
Light Showers
Mid-Afternoon
59°F 15°C
Light Showers
Early-Evening
59°F 15°C
Light Showers
Mildly cool near 59°F 15°C, persistent showers off and on through the day, with steady humidity and steady pressure. Winds blowing from the E at 13 mph 21 km/h. Gusts up to 20 mph 32 km/h.
Sunday, September 20, 2026
Mid-Morning
56°F 13°C
Light Showers
Mid-Afternoon
57°F 14°C
Scattered Showers
Early-Evening
56°F 13°C
Scattered Showers
Chilly near 57°F 14°C, locally heavy downpours at times, with steady humidity and steady pressure. Winds moving from the E to the ESE at 14 mph 23 km/h. Gusts up to 21 mph 33 km/h.
Monday, September 21, 2026
Mid-Morning
56°F 14°C
Cloudy
Mid-Afternoon
68°F 20°C
Sunny
Early-Evening
61°F 17°C
Sunny
Mild temperatures up to 68°F 20°C, cloudy in the morning, partly cloudy in the afternoon, and sunny this evening, with lower humidity and steady pressure. Winds out of the SE at 16 mph 26 km/h. Gusts up to 23 mph 36 km/h.
Tuesday, September 22, 2026
Mid-Morning
57°F 14°C
Sunny
Mid-Afternoon
81°F 27°C
Sunny
Early-Evening
73°F 23°C
Partly Cloudy
Very warm with a high of 81°F 27°C, sunny throughout the day, with lower humidity and steady pressure. Winds tapering down from S 19 mph 30 km/h to ENE 6 mph 9 km/h.
Wednesday, September 23, 2026
Mid-Morning
64°F 18°C
Sunny
Mid-Afternoon
73°F 23°C
Sunny
Early-Evening
65°F 18°C
Overcast
Pleasant near 73°F 23°C, sunny through the afternoon, turning partly cloudy this evening, with steady humidity and barometric pressure rising. Winds turning from the NW to the NNE at 10 mph 16 km/h.
Thursday, September 24, 2026
Mid-Morning
57°F 14°C
Sunny
Mid-Afternoon
79°F 26°C
Sunny
Early-Evening
74°F 23°C
Sunny
Comfortable with temperatures reaching 79°F 26°C, sunny throughout the day, with lower humidity and barometric pressure falling. Winds switching from the SE to the SSE at 18 mph 28 km/h. Gusts up to 31 mph 50 km/h.
Friday, September 25, 2026
Mid-Morning
66°F 19°C
Sunny
Mid-Afternoon
81°F 27°C
Sunny
Early-Evening
73°F 23°C
Sunny
Quite warm around 81°F 27°C, sunny through the afternoon, turning partly cloudy this evening, with lower humidity and barometric pressure falling. Winds moving from the SSE to the SE at 19 mph 31 km/h. Gusts up to 28 mph 45 km/h.
Saturday, September 26, 2026
Mid-Morning
66°F 19°C
Sunny
Mid-Afternoon
87°F 31°C
Sunny
Early-Evening
77°F 25°C
Overcast
Warm temperatures up to 87°F 31°C, sunny through the afternoon, turning overcast this evening, with lower humidity and barometric pressure falling. Winds swinging from the SSE to the WNW at 16 mph 25 km/h. Gusts up to 22 mph 36 km/h.
Sunday, September 27, 2026
Mid-Morning
56°F 13°C
Sunny
Mid-Afternoon
67°F 20°C
Partly Cloudy
Early-Evening
64°F 18°C
Cloudy
Mildly cool near 67°F 20°C, sunny in the morning, partly cloudy in the afternoon, and cloudy this evening, with lower humidity and steady pressure. Winds easing from W 20 mph 32 km/h to SSW 8 mph 13 km/h.
Monday, September 28, 2026
Mid-Morning
53°F 12°C
Cloudy
Mid-Afternoon
56°F 13°C
Cloudy
Early-Evening
49°F 10°C
Overcast
Chilly near 56°F 13°C, overcast in the morning, cloudy in the afternoon, and overcast this evening, with increasing humidity and steady pressure. Winds building from WSW at 9 mph 15 km/h to W at 22 mph 36 km/h. Gusts up to 29 mph 47 km/h.
Tuesday, September 29, 2026
Mid-Morning
42°F 6°C
Scattered Showers
Mid-Afternoon
43°F 6°C
Scattered Showers
Early-Evening
42°F 6°C
Scattered Showers
Cold with a high near 43°F 6°C, locally heavy downpours at times, with steady humidity and barometric pressure rising. Winds switching from the WNW to the NW at 18 mph 29 km/h. Gusts up to 23 mph 37 km/h.
Wednesday, September 30, 2026
Mid-Morning
40°F 4°C
Scattered Showers
Mid-Afternoon
43°F 6°C
Scattered Showers
Early-Evening
44°F 7°C
Scattered Showers
Nippy around 43°F 6°C, periods of heavy rain and gusty conditions, with lower humidity and steady pressure. Winds moving from the NW to the WNW at 6 mph 9 km/h.
Thursday, October 1, 2026
Mid-Morning
44°F 7°C
Sunny
Mid-Afternoon
58°F 14°C
Sunny
Early-Evening
54°F 12°C
Sunny
Mildly cool near 58°F 14°C, sunny through the afternoon, turning partly cloudy this evening, with lower humidity and barometric pressure falling.
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