Mammoth Lakes, CA

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Mammoth Lakes - river and trees
Airwolfhound from Hertfordshire, UK, CC BY-SA 2.0, via Wikimedia Commons

Today’s Forecast:

🌤
51°F
High: 65° | Low: 40°
Current Temperature
Station: D5868
Observed at: 11:15 am CDT on 9/26/26
Wind: 5 mph | Humidity: 46%

Today:Mostly sunny, with a high near 65. Southwest wind around 10 mph, with gusts as high as 35 mph.
Tonight:Mostly cloudy, with a low around 40. Southwest wind 5 to 15 mph, with gusts as high as 35 mph.
Sunday:Sunny. High near 61, with temperatures falling to around 53 in the afternoon. Southwest wind 5 to 15 mph, with gusts as high as 35 mph.

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Today’s Report:

🥾 Hiking

Excellent
  100 /100

Excellent for hiking. High near 60°F. Low rain risk (1%). Light wind (15 mph).

  • Temp: Favorable conditions
  • Rain: Favorable conditions
  • Wind: Favorable conditions
  • Thunderstorm: Favorable conditions
Tomorrow's Outlook:
Not Recommended 12/100
Not Recommended for hiking. High near 37°F. Risk of rain (47%). Temperatures outside comfort limits (37°F).

🚲 Biking

Excellent
  97 /100

Excellent for biking. High near 60°F. Low rain risk (1%). Breezy winds (15 mph).

  • Temp: Favorable conditions
  • Rain: Favorable conditions
  • Wind: Marginal weather factor
  • Thunderstorm: Favorable conditions
Tomorrow's Outlook:
Not Recommended 11/100
Not Recommended for biking. High near 37°F. Risk of rain (47%). Temperatures outside comfort limits (37°F).

⛺ Camping

Excellent
  97 /100

Excellent for camping. High near 60°F. Low rain risk (1%). Breezy winds (15 mph).

  • Temp: Favorable conditions
  • Rain: Favorable conditions
  • Wind: Marginal weather factor
  • Thunderstorm: Favorable conditions
Tomorrow's Outlook:
Not Recommended 12/100
Not Recommended for camping. High near 37°F. Risk of rain (47%). Temperatures outside comfort limits (37°F).



About Mammoth Lakes

Mammoth Lakes is an outdoor-planning page for Mammoth town, Lakes Basin, and nearby volcanic terrain. It has a distinct purpose centered on snow, road openings, high elevation, cold nights, thunderstorms, and smoke, with the forecast used to choose the safest and most comfortable version of the day.

Make the Most of a Mammoth Lakes Day

Start by comparing conditions across Mammoth Lakes, Lakes Basin, and the rest of the coverage area. Choose among hiking, biking, camping based on wind, precipitation, temperature, visibility, water or trail conditions, road access, smoke, and available daylight.

Weather Tips for Mammoth Lakes

  • Conditions around Mammoth town, Lakes Basin, and nearby volcanic terrain can differ sharply from nearby towns; snow, road openings, high elevation, cold nights, thunderstorms, and smoke are the main planning variables.
  • For camping, confirm overnight lows, wind, precipitation, fire restrictions, campground access, and how quickly shelter or services can be reached.
  • Check elevation-specific forecasts, snow and ice, chain controls, seasonal roads, cold nights, thunderstorms, wildfire smoke, and shoulder-season closures.
  • Check current road, trail, ramp, campground, and park alerts before relying on a remote access point.

Nearby Towns and Areas

This page covers Mammoth town, Lakes Basin, and nearby volcanic terrain. It can also be useful when planning outdoor time near:

  • Mammoth Lakes
  • Lakes Basin
  • Devils Postpile
  • Reds Meadow
  • Convict Lake
  • Hot Creek
  • Minaret Vista

Plan Around the Conditions

Use the forecast to choose the best version of Mammoth Lakes rather than forcing one itinerary. A shorter route, earlier launch, sheltered shoreline, lower-elevation trail, or town-based backup can preserve the day when conditions change.

7-Day Forecast for Mammoth Lakes

🌤
51°F
High: 65° | Low: 40°
Current Temperature
Station: D5868
Observed at: 11:15 am CDT on 9/26/26
Wind: 5 mph | Humidity: 46%
Sat ⛅
65° 40°
0%
Sun ☀
61° 36°
1%
Mon ❄
55° 36°
50%
Tue ☀
64° 41°
2%
Wed ☀
71° 45°
0%
Thu ☀
71° 43°
0%
Fri ☀
69° 41°
0%

7-Day High Temperature Trend

65° Sat 61° Sun 55° Mon 64° Tue 71° Wed 71° Thu 69° Fri

7-Day Low Temperature Trend

40° Sat 36° Sun 36° Mon 41° Tue 45° Wed 43° Thu 41° Fri

📊 7-Day Outdoor Outlook

Good Fair Poor 100 Sat 100 Sun 95 Mon 100 Tue 100 Wed 100 Thu 100 Fri
Forecast data from the National Weather Service  |  Last Updated: September 26, 2026 10:25 pm CDT

Mammoth Lakes Weather by Season

Winter

At Mammoth Lakes, deep snow, avalanche terrain, closed roads, and limited services define winter access. Many trailheads are unreachable, and clear skies do not remove cold-night, ice, or high-elevation hazards.

Spring

Around Mammoth town, Lakes Basin, and nearby volcanic terrain, spring remains wintry in the high country, with snow-covered trails, runoff, muddy lower approaches, and roads opening gradually. Shoulder-season plans should stay flexible around snowpack and overnight freezes.

Summer

For snow, road openings, high elevation, cold nights, thunderstorms, and smoke, summer is the main access season, with intense high-elevation sun, cold nights, snowmelt crossings, and afternoon thunderstorms. Wildfire smoke and fire restrictions can alter routes or close backcountry areas.

Fall

Near Mammoth Lakes and the surrounding area, early fall can be stable and clear, but freezing nights and early snow arrive quickly. Passes, campgrounds, and seasonal roads may close with little relation to conditions in nearby valleys.

Key Climate Data Points

  • Warmest months: July and August.
  • Coolest months: December through March.
  • Wettest season: November through April, primarily snow.
  • Driest season: July through September.
  • Best outdoor window: Mid-July through September after snow retreat and before sustained winter weather.