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Sun Valley, ID Weather Forecast
Sun Valley, ID Weather Forecast Dated: 405 PM Fri Sep 18 2026
Expect a cool pattern with a mix of sun and clouds and frequent chances of rain over the coming period. moderate humidity and no major pressure swings will dominate.
Friday, September 18, 2026
Mid-Morning
48°F 9°C
Light Showers
Mid-Afternoon
57°F 14°C
Scattered Thunderstorms
Early-Evening
50°F 10°C
Scattered Thunderstorms
Brisk around 57°F 14°C, rounds of showers expected off and on all day, with lower humidity and steady pressure. Winds turning from the NNE to the E at 3 mph 6 km/h.
Saturday, September 19, 2026
Mid-Morning
43°F 6°C
Nearby Thunderstorms
Mid-Afternoon
50°F 10°C
Nearby Thunderstorms
Early-Evening
49°F 9°C
Light Showers
Cool and brisk at 50°F 10°C, locally heavy thunderstorms at times, with steady humidity and steady pressure.
Sunday, September 20, 2026
Mid-Morning
47°F 8°C
Overcast
Mid-Afternoon
62°F 16°C
Sunny
Early-Evening
55°F 13°C
Overcast
Comfortable at 62°F 16°C, overcast in the morning, sunny in the afternoon, and cloudy this evening, with lower humidity and steady pressure.
Monday, September 21, 2026
Mid-Morning
52°F 11°C
Sunny
Mid-Afternoon
63°F 17°C
Overcast
Early-Evening
56°F 13°C
Overcast
Cool with a high near 63°F 17°C, sunny in the morning, becoming overcast through the afternoon and evening, with lower humidity and barometric pressure falling.
Tuesday, September 22, 2026
Mid-Morning
54°F 12°C
Overcast
Mid-Afternoon
64°F 18°C
Partly Cloudy
Early-Evening
57°F 14°C
Overcast
Refreshing around 64°F 18°C, overcast in the morning, cloudy in the afternoon, and partly cloudy this evening, with lower humidity and steady pressure. Winds switching from the ESE to the NE at 6 mph 9 km/h.
Wednesday, September 23, 2026
Mid-Morning
53°F 12°C
Sunny
Mid-Afternoon
67°F 20°C
Sunny
Early-Evening
59°F 15°C
Sunny
Mildly cool near 67°F 20°C, sunny throughout the day, with steady humidity and steady pressure.
Thursday, September 24, 2026
Mid-Morning
56°F 13°C
Sunny
Mid-Afternoon
67°F 20°C
Sunny
Early-Evening
60°F 15°C
Sunny
Comfortable at 67°F 20°C, sunny throughout the day, with steady humidity and steady pressure. Winds moving from the ESE to the ENE at 5 mph 9 km/h.
Friday, September 25, 2026
Mid-Morning
56°F 14°C
Overcast
Mid-Afternoon
64°F 18°C
Scattered Showers
Early-Evening
56°F 13°C
Light Showers
Cool with a high near 64°F 18°C, scattered downpours possible, with increasing humidity and barometric pressure falling. Winds swinging from the SE to the SSW at 9 mph 14 km/h.
Saturday, September 26, 2026
Mid-Morning
55°F 13°C
Overcast
Mid-Afternoon
66°F 19°C
Overcast
Early-Evening
39°F 4°C
Nearby Thunderstorms
Refreshing around 66°F 19°C, heavy thunderstorms conditions at times, with increasing humidity and barometric pressure falling. Winds shifting from the E to the SSW at 6 mph 10 km/h.
Sunday, September 27, 2026
Mid-Morning
34°F 1°C
Cloudy
Mid-Afternoon
44°F 7°C
Light Showers
Early-Evening
39°F 4°C
Light Showers
Nippy around 44°F 7°C, drier morning followed by showers lasting through evening, with steady humidity and steady pressure.
Monday, September 28, 2026
Mid-Morning
36°F 2°C
Overcast
Mid-Afternoon
47°F 8°C
Scattered Showers
Early-Evening
40°F 5°C
Scattered Showers
Chilly near 47°F 8°C, scattered downpours possible, with steady humidity and steady pressure.
Tuesday, September 29, 2026
Mid-Morning
38°F 3°C
Scattered Showers
Mid-Afternoon
42°F 6°C
Light Showers
Early-Evening
36°F 2°C
Light Showers
Cold with a high near 42°F 6°C, locally heavy downpours at times, with increasing humidity and barometric pressure rising. Winds increasing from the E at 1 mph 2 km/h to NNE at 10 mph 17 km/h.
Wednesday, September 30, 2026
Mid-Morning
34°F 1°C
Sunny
Mid-Afternoon
49°F 9°C
Sunny
Early-Evening
42°F 6°C
Overcast
Brisk around 49°F 9°C, sunny through the afternoon, turning partly cloudy this evening, with lower humidity and steady pressure. Winds switching from the NNE to the NE at 5 mph 8 km/h.
Thursday, October 1, 2026
Mid-Morning
41°F 5°C
Sunny
Mid-Afternoon
58°F 14°C
Sunny
Early-Evening
50°F 10°C
Sunny
Mildly cool near 58°F 14°C, sunny throughout the day, with lower humidity and barometric pressure falling.
Sun Valley, ID Weather Radar Map
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