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Mammoth Lakes (CA)
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Weather in Mammoth Lakes, California for September 2026

Your guide to Mammoth Lakes weather in September - trends and predictions

    Official Weather Alert ⚠️

  • Lake Wind Advisory - See hour by hour.

    • Snow Forecast ❄️

  • Snowfall in Mammoth Lakes during September is quite rare, with fewer than 2 snowy days on average.
    According to Mammoth Lakes snow forecast for September 2026, no snow is expected until the end of the month.

    • Temperatures

  • Until now, September 2026 in Mammoth Lakes has been nearly identical to the historical average, with a temperature of 19.1 °F (showing only a slight deviation of 0.1 °F).

  • The forecast for the next days in Mammoth Lakes predicts temperatures to be around 20 °F, close to the historical average.

  • In general, the average temperature in Mammoth Lakes at the beginning of September is 20.4 °F. As the month progressed, temperatures tended to slightly decrease, reaching an average of 20 °F by the end of September.

    • Rain 🌧️

  • With an average of 4 rainy days, Mammoth Lakes experiences minimal rainfall in September.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
26
Dry days
Average rainy days
4
Rainy days
Average snowy days
1
Snow days
Average temperatures
18°/6°
Temperatures
Average wind speed
17 km/h
Avg max wind
Average humidity
46 %
Avg humidity

Mammoth Lakes Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
21°
2
Sunny
19°
3
Sunny
19°
4
Partly cloudy
20°
5
Patchy rain possible
22°
6
Sunny
21°
7
Sunny
21°
8
Sunny
21°
9
Sunny
20°
10
Overcast
20°
11
Sunny
19°
12
Sunny
19°
13
Sunny
19°
14
Sunny
21°
15
Sunny
19°
16
Light snow showers
16°
17
Sunny
17°
18
Thundery outbreaks possible
16°
19
Moderate or heavy rain with thunder
14°
20
Thundery outbreaks possible
17°
21
Weather Alert Smoky haze
16°
22
Sunny
19°
23
Sunny
21°
24
Smoky haze
20°
25
Sunny
19°
26
Overcast
20°
27
Sunny
17°
28
Sunny
20°
29
Sunny
22°
30
Sunny
22°

Temperatures trend during September in Mammoth Lakes

See the weather trend as well as the moving average line

September weather in Mammoth Lakes day by day

Click on a date for more information
August October
Date Weather Temperatures Rain Snow More
Sept. 1 Sunny
Sunny
 21° /8° 0 mm 0 cm
Sept. 2 Sunny
Sunny
 19° /6° 0 mm 0 cm
Sept. 3 Sunny
Sunny
 19° /6° 0 mm 0 cm
Sept. 4 Partly cloudy
Partly cloudy
 20° /6° 3.4 mm 0 cm
Sept. 5 Patchy rain possible
Patchy rain possible
 22° /7° 0 mm 0 cm
Sept. 6 Sunny
Sunny
 21° /6° 0 mm 0 cm
Sept. 7 Sunny
Sunny
 21° /5° 0 mm 0 cm
Sept. 8 Sunny
Sunny
 21° /6° 0 mm 0 cm
Sept. 9 Sunny
Sunny
 20° /6° 0 mm 0 cm
Sept. 10 Overcast
Overcast
 20° /5° 0.7 mm 0 cm
Sept. 11 Sunny
Sunny
 19° /5° 0 mm 0 cm
Sept. 12 Sunny
Sunny
 19° /3° 0 mm 0 cm
Sept. 13 Sunny
Sunny
 19° /4° 0 mm 0 cm
Sept. 14 Sunny
Sunny
 21° /4° 0 mm 0 cm
Sept. 15 Sunny
Sunny
 19° /4° 0 mm 0 cm
Sept. 16 Light snow showers
Light snow showers
 16° /3° 0.3 mm 0.1 cm
Sept. 17 Sunny
Sunny
 17° /3° 0 mm 0 cm
Sept. 18 Thundery outbreaks possible
Thundery outbreaks possible
 16° /3° 12.1 mm 0 cm
Sept. 19 Moderate or heavy rain with thunder
Moderate or heavy rain with thunder
 14° /4° 11.7 mm 0 cm
Sept. 20 Thundery outbreaks possible
Thundery outbreaks possible
 17° /4° 0 mm 0 cm
Sept. 21 Smoky haze
Smoky haze
 16° /5° 6 mm 0 cm
Sept. 22 Sunny
Sunny
 19° /5° 0 mm 0 cm
Sept. 23 Sunny
Sunny
 21° /7° 0 mm 0 cm
Sept. 24 Smoky haze
Smoky haze
 20° /8° 0 mm 0 cm
Sept. 25 Sunny
Sunny
 19° /7° 0 mm 0 cm
Sept. 26 Overcast
Overcast
 20° /6° 0 mm 0 cm
Sept. 27 Sunny
Sunny
 17° /4° 0 mm 0 cm
Sept. 28 Sunny
Sunny
 20° /3° 0 mm 0 cm
Sept. 29 Sunny
Sunny
 22° /6° 0 mm 0 cm
Sept. 30 Sunny
Sunny
 22° /6° 0 mm 0 cm
Next
Important Notice
Our weather forecast for Mammoth Lakes in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Mammoth Lakes forecast closer to your planned date for the most up-to-date weather information.
Change Month
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Mammoth Lakes in September - FAQ

What are the expected maximum and minimum temperatures in Mammoth Lakes during September?
Enjoy moderate daytime temperatures of up to 18° and cooler nights around 6°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Mammoth Lakes during September?
Moderate rainfall is anticipated in Mammoth Lakes during September, with a total of 53 mm spread over approximately 4 days. Considering plans for rainy days is advisable.

Will it snow in Mammoth Lakes in September 2026?
Mammoth Lakes typically sees 0.2 cm of snowfall during September.

What are the typical wind conditions in Mammoth Lakes during September?
The average wind speed in Mammoth Lakes during September is 17 km/h, suggesting breezy to windy conditions, depending on your activities.

Mammoth Lakes snow forecast September 2026

Track daily snowfall levels and discover Mammoth Lakes’s snowy potential this September ❄️
On average, Mammoth Lakes sees 1 snowy days during September, with approximately 0.2 cm of total snowfall.

September rainfall patterns in Mammoth Lakes

Explore the daily rainfall trends and prepare for Mammoth Lakess September weather 💧
Typically, Mammoth Lakes has 4 rainy days in September with a total of 53 mm of rainfall.

UV exposure in Mammoth Lakes during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Location coordinates Where is Mammoth Lakes?

Get accurate weather forecasts for Mammoth Lakes, located at latitude 37.649 and longitude -118.972. Stay updated with localized weather information tailored for Mammoth Lakes.

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