Sun Valley & Ketchum, ID

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The Wood River Valley, Pioneer Mountains, Ketchum, and Sun Valley viewed from Bald Mountain in winter
The Wood River Valley, Pioneer Mountains, Ketchum, and Sun Valley viewed from Bald Mountain in winter. Image by Chloé François from Boston, Massachusetts, United States of America via Wikimedia Commons, CC BY 2.0.

Today’s Forecast:

☀
34°F
High: 60° | Low: 32°
Current Temperature
Clear
Station: KSUN
Observed at: 7:15 am CST on 11/12/26
Wind: 13 mph | Humidity: 75%
Today:Mostly sunny. High near 60, with temperatures falling to around 52 in the afternoon. East wind 2 to 7 mph.
Tonight:Mostly cloudy, with a low around 32. North northeast wind 2 to 6 mph.
Friday:Rain likely after 5pm. Partly sunny. High near 53, with temperatures falling to around 49 in the afternoon. East southeast wind 6 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 70%.
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Today’s Report:

🥾 Hiking

Good
  83 /100

Good for hiking. High near 53°F. Rain forecast in the evening (67%). Light wind (13 mph).

  • Temp: Marginal weather factor
  • Rain: Marginal weather factor
  • Wind: Favorable conditions
  • Thunderstorm: Favorable conditions
Tomorrow's Outlook:
Not Recommended 18/100
Not Recommended for hiking. High near 53°F. High rain probability (67%). Light wind (13 mph).

🚲 Biking

Good
  75 /100

Good for biking. High near 53°F. Rain forecast in the evening (67%). Light wind (13 mph).

  • Temp: Marginal weather factor
  • Rain: Marginal weather factor
  • Wind: Favorable conditions
  • Thunderstorm: Favorable conditions
Tomorrow's Outlook:
Not Recommended 16/100
Not Recommended for biking. High near 53°F. High rain probability (67%). Light wind (13 mph).

🎪 Outdoor Events / Activities

Fair
  67 /100

Fair for outdoor events / activities. High near 53°F. Rain forecast in the evening (67%). Light wind (13 mph).

  • Temp: Marginal weather factor
  • Rain: Marginal weather factor
  • Wind: Favorable conditions
  • Thunderstorm: Favorable conditions
Tomorrow's Outlook:
Not Recommended 13/100
Not Recommended for outdoor events / activities. High near 53°F. High rain probability (67%). Light wind (13 mph).

About Sun Valley

Sun Valley & Ketchum is an Idaho destination for a major four-season resort community with downhill skiing and extensive Nordic trails.

Make the Most of a Ketchum Day

Match the route, launch, facility, or turnaround time to wind, precipitation, temperature, smoke, water, snow, road access, and daylight. Keep a shorter or more sheltered backup ready.

Weather Tips for Sun Valley & Ketchum

  • Check official access notices, alerts, road or trail conditions, fire restrictions, and local forecasts before leaving.
  • Turn around before exposed ridges, canyon rims, dunes, or open ground become unsafe in lightning, heat, smoke, wind, or poor visibility.
  • Carry layers, water, navigation, sun protection, and seasonal traction or flotation appropriate to the activity.
  • Allow extra time for remote roads, mountain passes, wildfire smoke, spring runoff, and limited winter daylight.

Nearby Towns and Areas

This page can also be useful when planning outdoor time near:

  • Warm Springs
  • Trail Creek
  • Dollar Mountain
  • Elkhorn
  • Big Wood River

Plan Around the Conditions

Choose the safest version of a Sun Valley & Ketchum day by matching the activity to current wind, precipitation, temperature, smoke, water or snow conditions, access, and daylight.

7-Day Forecast for Sun Valley & Ketchum, ID

☀
34°F
High: 60° | Low: 32°
Current Temperature
Clear
Station: KSUN
Observed at: 7:15 am CST on 11/12/26
Wind: 13 mph | Humidity: 75%
Thu ⛅
60° 32°
0%
Fri 🌧
53° 32°
67%
Sat ❄
45° 22°
44%
Sun ⛅
45° 28°
3%
Mon ❄
46° 29°
54%
Tue ❄
44° 26°
57%
Wed ❄
42° 22°
41%

7-Day High Temperature Trend

60° Thu 53° Fri 45° Sat 45° Sun 46° Mon 44° Tue 42° Wed

7-Day Low Temperature Trend

32° Thu 32° Fri 22° Sat 28° Sun 29° Mon 26° Tue 22° Wed

📊 7-Day Outdoor Outlook

Good Fair Poor 100 Thu 79 Fri 19 Sat 20 Sun 19 Mon 19 Tue 19 Wed
Forecast data from the National Weather Service  |  Last Updated: November 12, 2026 8:29 pm CST

Weather by Season

Winter

Winter at Sun Valley & Ketchum can bring snow, ice, wind, short daylight, and rapidly changing road or trail access. Confirm grooming, avalanche information, ice conditions, and facility operations for the listed winter activities.

Spring

Spring brings freeze-thaw mud, snowmelt, high rivers, cold water, and lingering mountain snow. Lower routes usually open well before high passes and backcountry trailheads.

Summer

Summer usually offers the broadest access, but dry heat, thunderstorms, lightning, wildfire smoke, fire restrictions, reservoir wind, and cold mountain water can alter plans.

Fall

Fall brings cooler air, shorter daylight, hunting-season awareness, and early snow at elevation. Confirm seasonal services and allow extra travel time on remote roads.

Key Climate Data Points

  • Annual average temperature: around 34–42°F in nearby valleys and colder on the mountain, using the relevant local and elevation context.
  • Annual snowfall: often 100–250+ inches at ski elevations, with wind and elevation creating major variation.
  • Warmest months: July and August are normally warmest.
  • Coolest months: December and January are typically coolest.
  • Wettest season: winter and spring usually provide the greatest mountain precipitation, with local variation.
  • Driest season: midsummer is generally driest, despite isolated thunderstorms.
  • Best outdoor window: June through October for warm-season access, with midwinter best at established winter destinations.