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Weather in Mammoth Lakes, California for September 2025

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

    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 2025, 1 snowy day is expected until the end of the month at Saturday, September 27.

    • Temperatures

  • Until now, September 2025 in Mammoth Lakes is cooler than usual, with temperatures averaging 17 °F, this is -3.1 °F below the typical seasonal average.

  • Expect cooler weather in the next days in Mammoth Lakes with the forecast suggesting a temperature of 18.2 °F, lower than the historical average.

  • In general, the average temperature in Mammoth Lakes at the beginning of September is 21.9 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.1 °F by the end of September.

    • Rain 🌧️

  • With an average of 2 rainy days, Mammoth Lakes experiences minimal rainfall in September.

    • More

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

Average dry days
27
Dry days
Average rainy days
2
Rainy days
Average snowy days
1
Snow days
Average temperatures
20°/6°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
36 %
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
23°
2
Sunny
21°
3
Sunny
20°
4
Partly cloudy
22°
5
Patchy rain possible
24°
6
Patchy rain possible
22°
7
Partly cloudy
21°
8
Sunny
20°
9
Sunny
17°
10
Overcast
17°
11
Sunny
17°
12
Sunny
17°
13
Sunny
19°
14
Cloudy
21°
15
Sunny
19°
16
Sunny
22°
17
Sunny
21°
18
Partly cloudy
21°
19
Moderate rain
11°
20
Patchy rain possible
19°
21
Sunny
21°
22
Sunny
20°
23
Sunny
19°
24
Sunny
22°
25
Sunny
22°
26
Patchy rain possible
17°
27
Moderate rain
8°
28
Sunny
13°
29
Sunny
19°
30
Cloudy
19°

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
 23° /10° 0 mm 0 cm
Sept. 2 Sunny
Sunny
 21° /9° 0 mm 0 cm
Sept. 3 Sunny
Sunny
 20° /8° 0 mm 0 cm
Sept. 4 Partly cloudy
Partly cloudy
 22° /8° 5.1 mm 0 cm
Sept. 5 Patchy rain possible
Patchy rain possible
 24° /10° 0 mm 0 cm
Sept. 6 Patchy rain possible
Patchy rain possible
 22° /8° 0 mm 0 cm
Sept. 7 Partly cloudy
Partly cloudy
 21° /7° 0 mm 0 cm
Sept. 8 Sunny
Sunny
 20° /6° 0 mm 0 cm
Sept. 9 Sunny
Sunny
 17° /5° 0 mm 0 cm
Sept. 10 Overcast
Overcast
 17° /3° 0 mm 0 cm
Sept. 11 Sunny
Sunny
 17° /4° 0 mm 0 cm
Sept. 12 Sunny
Sunny
 17° /2° 0 mm 0 cm
Sept. 13 Sunny
Sunny
 19° /3° 0 mm 0 cm
Sept. 14 Cloudy
Cloudy
 21° /5° 0 mm 0 cm
Sept. 15 Sunny
Sunny
 19° /4° 0 mm 0 cm
Sept. 16 Sunny
Sunny
 22° /8° 0 mm 0 cm
Sept. 17 Sunny
Sunny
 21° /9° 0 mm 0 cm
Sept. 18 Partly cloudy
Partly cloudy
 21° /9° 0 mm 0 cm
Sept. 19 Moderate rain
Moderate rain
 11° /7° 5.4 mm 0 cm
Sept. 20 Patchy rain possible
Patchy rain possible
 19° /5° 0.8 mm 0 cm
Sept. 21 Sunny
Sunny
 21° /7° 0 mm 0 cm
Sept. 22 Sunny
Sunny
 20° /8° 0 mm 0 cm
Sept. 23 Sunny
Sunny
 19° /7° 0 mm 0 cm
Sept. 24 Sunny
Sunny
 22° /8° 0 mm 0 cm
Sept. 25 Sunny
Sunny
 22° /8° 0 mm 0 cm
Sept. 26 Patchy rain possible
Patchy rain possible
 17° /7° 0.5 mm 0 cm
Sept. 27 Moderate rain
Moderate rain
 8° /1° 6.1 mm 1.3 cm
Sept. 28 Sunny
Sunny
 13° /-2° 0 mm 0 cm
Sept. 29 Sunny
Sunny
 19° /2° 0 mm 0 cm
Sept. 30 Cloudy
Cloudy
 19° /7° 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 20° 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?
In September, Mammoth Lakes can expect light to moderate rainfall, totaling 39.8 mm across approximately 2 days. Occasional showers are possible, and planning ahead for them could be helpful.
Will it snow in Mammoth Lakes in September 2025?
Mammoth Lakes typically sees 0.32 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 18 km/h, suggesting breezy to windy conditions, depending on your activities.

Mammoth Lakes snow forecast September 2025

Track daily snowfall levels and discover Mammoth Lakes’s snowy potential this September ❄️

September rainfall patterns in Mammoth Lakes

Explore the daily rainfall trends and prepare for Mammoth Lakess September weather 💧

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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