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Mariposa County (Yosemite Valley)
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United States weather

Weather in Mariposa County, California for September 2025

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

    Snow Forecast ❄️

  • Snowfall in Mariposa County during September is quite rare, with fewer than 2 snowy days on average.
    According to Mariposa County snow forecast for September 2025, 2 snowy days are expected until the end of the month. The closest date with snow is Saturday, September 27.

    • Temperatures

  • Until now, September 2025 in Mariposa County is cooler than usual, with temperatures averaging 17.3 °F, this is -2.9 °F below the typical seasonal average.

  • Expect cooler weather in the next days in Mariposa County with the forecast suggesting a temperature of 16.1 °F, lower than the historical average.

  • In general, the average temperature in Mariposa County at the beginning of September is 23 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 12.7 °F by the end of September.

    • Rain 🌧️

  • Precipitation in Mariposa County during September is a rare event, with an average of fewer than 2 rainy days.

    • More

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

Average dry days
28
Dry days
Average rainy days
1
Rainy days
Average snowy days
1
Snow days
Average temperatures
20°/11°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
35 %
Avg humidity

Mariposa County Weather September

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

Temperatures trend during September in Mariposa County

See the weather trend as well as the moving average line

September weather in Mariposa County day by day

Click on a date for more information
August October
Date Weather Temperatures Rain Snow More
Sept. 1 Sunny
Sunny
 24° /16° 0 mm 0 cm
Sept. 2 Sunny
Sunny
 22° /15° 0 mm 0 cm
Sept. 3 Sunny
Sunny
 22° /14° 0 mm 0 cm
Sept. 4 Sunny
Sunny
 24° /15° 0 mm 0 cm
Sept. 5 Sunny
Sunny
 24° /16° 0 mm 0 cm
Sept. 6 Sunny
Sunny
 23° /15° 0 mm 0 cm
Sept. 7 Sunny
Sunny
 22° /13° 0 mm 0 cm
Sept. 8 Sunny
Sunny
 21° /12° 0 mm 0 cm
Sept. 9 Sunny
Sunny
 17° /10° 0 mm 0 cm
Sept. 10 Cloudy
Cloudy
 15° /9° 0 mm 0 cm
Sept. 11 Sunny
Sunny
 15° /6° 0 mm 0 cm
Sept. 12 Sunny
Sunny
 16° /8° 1.6 mm 0 cm
Sept. 13 Sunny
Sunny
 19° /9° 0 mm 0 cm
Sept. 14 Partly cloudy
Partly cloudy
 20° /10° 0 mm 0 cm
Sept. 15 Sunny
Sunny
 19° /10° 0 mm 0 cm
Sept. 16 Moderate or heavy snow showers
Moderate or heavy snow showers
 14° /8° 0.9 mm 0.1 cm
Sept. 17 Sunny
Sunny
 23° /15° 0 mm 0 cm
Sept. 18 Patchy rain possible
Patchy rain possible
 20° /12° 0.3 mm 0 cm
Sept. 19 Heavy rain
Heavy rain
 13° /11° 68.6 mm 0 cm
Sept. 20 Patchy rain possible
Patchy rain possible
 19° /8° 0.1 mm 0 cm
Sept. 21 Sunny
Sunny
 20° /11° 0 mm 0 cm
Sept. 22 Sunny
Sunny
 23° /13° 0 mm 0 cm
Sept. 23 Patchy rain possible
Patchy rain possible
 19° /9° 1.1 mm 0 cm
Sept. 24 Sunny
Sunny
 14° /6° 0 mm 0 cm
Sept. 25 Sunny
Sunny
 17° /6° 0 mm 0 cm
Sept. 26 Sunny
Sunny
 16° /6° 0 mm 0 cm
Sept. 27 Moderate rain
Moderate rain
 5° /3° 6.4 mm 1.3 cm
Sept. 28 Patchy rain possible
Patchy rain possible
 8° /2° 0.4 mm 0.2 cm
Sept. 29 Sunny
Sunny
 14° /4° 0 mm 0 cm
Sept. 30 Sunny
Sunny
 15° /6° 0 mm 0 cm
Next
Important Notice
Our weather forecast for Mariposa 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 Mariposa County forecast closer to your planned date for the most up-to-date weather information.
Change Month
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Mariposa County in September - FAQ

What are the expected maximum and minimum temperatures in Mariposa County during September?
Enjoy moderate daytime temperatures of up to 20° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Mariposa County during September?
In September, Mariposa County can expect light to moderate rainfall, totaling 37.8 mm across approximately 1 days. Occasional showers are possible, and planning ahead for them could be helpful.
Will it snow in Mariposa County in September 2025?
Mariposa County typically sees 0.19 cm of snowfall during September.
What are the typical wind conditions in Mariposa County during September?
The average wind speed in Mariposa County during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.

Mariposa County snow forecast September 2025

Track daily snowfall levels and discover Mariposa County’s snowy potential this September ❄️

September rainfall patterns in Mariposa County

Explore the daily rainfall trends and prepare for Mariposa Countys September weather 💧

UV exposure in Mariposa County during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Top locations in Mariposa County
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Yosemite National ParkYosemite Valley
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Location coordinates Where is Mariposa County?

Get accurate weather forecasts for Mariposa County, located at latitude 37.741 and longitude -119.578. Stay updated with localized weather information tailored for Mariposa County.

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