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Weather in Mammoth Lakes 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.

    • Temperatures

  • In general, the average temperature in Mammoth Lakes at the beginning of September is 24 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.6 °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
22°
3
Sunny
23°
4
Partly cloudy
25°
5
Patchy rain possible
26°
6
Patchy rain possible
25°
7
Partly cloudy
24°
8
Sunny
23°
9
Sunny
22°
10
Overcast
22°
11
Sunny
21°
12
Sunny
20°
13
Sunny
22°
14
Cloudy
21°
15
Sunny
17°
16
Light snow showers
8°
17
Partly cloudy
13°
18
Thundery outbreaks possible
12°
19
Moderate or heavy rain with thunder
10°
20
Thundery outbreaks possible
15°
21
Cloudy
17°
22
Partly cloudy
18°
23
Sunny
19°
24
Sunny
20°
25
Sunny
19°
26
Sunny
21°
27
Sunny
22°
28
Sunny
22°
29
Sunny
21°
30
Cloudy
19°
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Access Mammoth Lakes weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
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Temperatures trend during September in Mammoth Lakes

See the weather trend as well as the moving average line

September weather day by day

Click on a date for more information
August October
Date Weather Temperatures Rain Snow More
Sept. 1 Sunny
Sunny
 23° /9° 0 mm 0 cm
Sept. 2 Sunny
Sunny
 22° /8° 0 mm 0 cm
Sept. 3 Sunny
Sunny
 23° /7° 0 mm 0 cm
Sept. 4 Partly cloudy
Partly cloudy
 25° /8° 0 mm 0 cm
Sept. 5 Patchy rain possible
Patchy rain possible
 26° /10° 0.1 mm 0 cm
Sept. 6 Patchy rain possible
Patchy rain possible
 25° /11° 0 mm 0 cm
Sept. 7 Partly cloudy
Partly cloudy
 24° /10° 0 mm 0 cm
Sept. 8 Sunny
Sunny
 23° /9° 0 mm 0 cm
Sept. 9 Sunny
Sunny
 22° /8° 0 mm 0 cm
Sept. 10 Overcast
Overcast
 22° /6° 0 mm 0 cm
Sept. 11 Sunny
Sunny
 21° /3° 0 mm 0 cm
Sept. 12 Sunny
Sunny
 20° /1° 0 mm 0 cm
Sept. 13 Sunny
Sunny
 22° /3° 0 mm 0 cm
Sept. 14 Cloudy
Cloudy
 21° /6° 0 mm 0 cm
Sept. 15 Sunny
Sunny
 17° /2° 0 mm 0 cm
Sept. 16 Light snow showers
Light snow showers
 8° /-1° 0.8 mm 0.3 cm
Sept. 17 Partly cloudy
Partly cloudy
 13° /-1° 0 mm 0 cm
Sept. 18 Thundery outbreaks possible
Thundery outbreaks possible
 12° /0° 6.2 mm 0 cm
Sept. 19 Moderate or heavy rain with thunder
Moderate or heavy rain with thunder
 10° /3° 32.7 mm 0 cm
Sept. 20 Thundery outbreaks possible
Thundery outbreaks possible
 15° /2° 0 mm 0 cm
Sept. 21 Cloudy
Cloudy
 17° /5° 0 mm 0 cm
Sept. 22 Partly cloudy
Partly cloudy
 18° /4° 0 mm 0 cm
Sept. 23 Sunny
Sunny
 19° /6° 0 mm 0 cm
Sept. 24 Sunny
Sunny
 20° /6° 0 mm 0 cm
Sept. 25 Sunny
Sunny
 19° /7° 0 mm 0 cm
Sept. 26 Sunny
Sunny
 21° /5° 0 mm 0 cm
Sept. 27 Sunny
Sunny
 22° /7° 0 mm 0 cm
Sept. 28 Sunny
Sunny
 22° /8° 0 mm 0 cm
Sept. 29 Sunny
Sunny
 21° /9° 0 mm 0 cm
Sept. 30 Cloudy
Cloudy
 19° /7° 0 mm 0 cm
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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.

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 0.3 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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