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United States weather

Weather in Mono County, California for September 2026

Your guide to Mono County weather in September - trends and predictions

    Snow Forecast ❄️

  • Snowfall in Mono County during September is quite rare, with fewer than 2 snowy days on average.

    • Temperatures

  • In general, the average temperature in Mono County at the beginning of September is 21.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18 °C by the end of September.

    • Rain 🌧️

  • Mono County experiences moderate rainfall in September, with an average of 6 rainy days and a total precipitation of 53 mm.

    • More

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

Average dry days
23
Dry days
Average rainy days
6
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

Mono County Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
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
Light snow showers
15°
17
Partly cloudy
17°
18
Thundery outbreaks possible
14°
19
Moderate or heavy rain with thunder
12°
20
Thundery outbreaks possible
16°
21
Cloudy
16°
22
Partly cloudy
18°
23
Sunny
19°
24
Sunny
19°
25
Sunny
16°
26
Sunny
19°
27
Sunny
20°
28
Sunny
18°
29
Sunny
18°
30
Cloudy
16°

Temperatures trend during September in Mono County

See the weather trend as well as the moving average line

September weather in Mono County 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 Light snow showers
Light snow showers
 15° /3° 0.4 mm 0.2 cm
Sept. 17 Partly cloudy
Partly cloudy
 17° /4° 0 mm 0 cm
Sept. 18 Thundery outbreaks possible
Thundery outbreaks possible
 14° /4° 18.2 mm 0 cm
Sept. 19 Moderate or heavy rain with thunder
Moderate or heavy rain with thunder
 12° /5° 17.6 mm 0 cm
Sept. 20 Thundery outbreaks possible
Thundery outbreaks possible
 16° /3° 0 mm 0 cm
Sept. 21 Cloudy
Cloudy
 16° /6° 3.6 mm 0 cm
Sept. 22 Partly cloudy
Partly cloudy
 18° /5° 0 mm 0 cm
Sept. 23 Sunny
Sunny
 19° /6° 0 mm 0 cm
Sept. 24 Sunny
Sunny
 19° /6° 0 mm 0 cm
Sept. 25 Sunny
Sunny
 16° /7° 2.4 mm 0 cm
Sept. 26 Sunny
Sunny
 19° /6° 0 mm 0 cm
Sept. 27 Sunny
Sunny
 20° /6° 0 mm 0 cm
Sept. 28 Sunny
Sunny
 18° /7° 5.8 mm 0 cm
Sept. 29 Sunny
Sunny
 18° /6° 0 mm 0 cm
Sept. 30 Cloudy
Cloudy
 16° /4° 0 mm 0 cm
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Important Notice
Our weather forecast for Mono County 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 Mono County forecast closer to your planned date for the most up-to-date weather information.
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Mono County in September - FAQ

What are the expected maximum and minimum temperatures in Mono County 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 Mono County during September?

Moderate rainfall is anticipated in Mono County during September, with a total of 53 mm spread over approximately 6 days. Considering plans for rainy days is advisable.

Will it snow in Mono County in September 2026?

Mono County typically sees 0.16 cm of snowfall during September.

What are the typical wind conditions in Mono County during September?

The average wind speed in Mono County during September is 17 km/h, suggesting breezy to windy conditions, depending on your activities.

Mono County snow forecast September 2026

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

September rainfall patterns in Mono County

Explore the daily rainfall trends and prepare for Mono Countys September weather 💧
Typically, Mono County has 6 rainy days in September with a total of 53 mm of rainfall.

UV exposure in Mono County during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Mammoth Lakes
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Location coordinates Where is Mono County?

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

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