Bald Mountain, ID

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This is a photo of Bald Mountain, as seen from Sun Valley, Idaho. The ski town of Sun Valley is the focus of Sun Valley Magazine.
This is a photo of Bald Mountain, as seen from Sun Valley, Idaho. The ski town of Sun Valley is the focus of Sun Valley Magazine.. Image by Rickmouser45 via Wikimedia Commons, CC BY-SA 4.0.

Today’s Forecast:

☀
61°F
High: 66° | Low: 39°
Current Temperature
Clear
Station: KSUN
Observed at: 7:55 pm CDT on 9/26/26
Wind: 9 mph | Humidity: 29%
Tonight:Mostly cloudy. Low around 39, with temperatures rising to around 42 overnight. West northwest wind around 3 mph.
Sunday:Cloudy, with a high near 66. Northeast wind 2 to 6 mph.
Sunday Night:A slight chance of rain between 2am and 3am. Mostly cloudy. Low around 40, with temperatures rising to around 42 overnight. Northwest wind around 6 mph. Chance of precipitation is 20%.
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Today’s Report:

🥾 Hiking

Excellent
  100 /100

Excellent for hiking. High near 66°F. Low rain risk (4%). Light wind (6 mph).

  • Temp: Favorable conditions
  • Rain: Favorable conditions
  • Wind: Favorable conditions
  • Thunderstorm: Favorable conditions
Tomorrow's Outlook:
Excellent 100/100
Excellent for hiking. High near 66°F. Low rain risk (21%). Light wind (6 mph).

🚲 Biking

Excellent
  100 /100

Excellent for biking. High near 66°F. Low rain risk (4%). Light wind (6 mph).

  • Temp: Favorable conditions
  • Rain: Favorable conditions
  • Wind: Favorable conditions
  • Thunderstorm: Favorable conditions
Tomorrow's Outlook:
Excellent 100/100
Excellent for biking. High near 66°F. Low rain risk (21%). Light wind (6 mph).

🎪 Outdoor Events / Activities

Excellent
  100 /100

Excellent for outdoor events / activities. High near 66°F. Low rain risk (4%). Light wind (6 mph).

  • Temp: Favorable conditions
  • Rain: Favorable conditions
  • Wind: Favorable conditions
  • Thunderstorm: Favorable conditions
Tomorrow's Outlook:
Excellent 95/100
Excellent for outdoor events / activities. High near 66°F. Risk of rain (21%). Light wind (6 mph).

About Bald Mountain

Bald Mountain is an Idaho destination for Sun Valley’s primary ski mountain with summer trails and exposed alpine weather.

Make the Most of a Bald Mountain 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 Bald Mountain

  • 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:

  • River Run
  • Warm Springs
  • Ketchum
  • Dollar Mountain
  • Wood River Trail

Plan Around the Conditions

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

7-Day Forecast for Bald Mountain, ID

☀
61°F
High: 66° | Low: 39°
Current Temperature
Clear
Station: KSUN
Observed at: 7:55 pm CDT on 9/26/26
Wind: 9 mph | Humidity: 29%
Sun ☁
66° 40°
4%
Mon 🌧
66° 36°
21%
Tue ☀
70° 39°
0%
Wed ☀
71° 38°
0%
Thu ☀
71° 40°
0%
Fri ☀
70° 38°
1%
Sat ☀
68° --°
3%

7-Day High Temperature Trend

66° Sun 66° Mon 70° Tue 71° Wed 71° Thu 70° Fri 68° Sat

7-Day Low Temperature Trend

40° Sun 36° Mon 39° Tue 38° Wed 40° Thu 38° Fri 50° Sat

📊 7-Day Outdoor Outlook

Good Fair Poor 100 Sun 100 Mon 100 Tue 100 Wed 100 Thu 100 Fri 100 Sat
Forecast data from the National Weather Service  |  Last Updated: September 27, 2026 12:08 am CDT

Bald Mountain Weather by Season

Winter

Winter at Bald Mountain 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.