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Mariposa County (Yosemite National Park)
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Weather in Mariposa County, California for September 2026

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 2026, no snow is expected until the end of the month.

    • Temperatures

  • Until now, September 2026 in Mariposa County has been nearly identical to the historical average, with a temperature of 18.2 °F (showing only a slight deviation of 0.2 °F).

  • The forecast for the upcoming days in Mariposa County predicts a temperature of 19.3 °F, which is slightly above the historical average.

  • In general, the average temperature in Mariposa County at the beginning of September is 20 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 18.3 °F by the end of September.

    • Rain 🌧️

  • With an average of 5 rainy days, Mariposa County experiences minimal rainfall in September.

    • More

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

Average dry days
24
Dry days
Average rainy days
5
Rainy days
Average snowy days
1
Snow days
Average temperatures
17°/9°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
49 %
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
21°
2
Sunny
19°
3
Sunny
19°
4
Sunny
20°
5
Sunny
21°
6
Sunny
20°
7
Sunny
20°
8
Sunny
20°
9
Sunny
19°
10
Overcast
17°
11
Sunny
17°
12
Sunny
18°
13
Sunny
18°
14
Cloudy
19°
15
Sunny
18°
16
Patchy light snow with thunder
14°
17
Cloudy
15°
18
Thundery outbreaks possible
14°
19
Moderate or heavy rain shower
14°
20
Sunny
17°
21
Smoky haze
17°
22
Smoky haze
19°
23
Smoky haze
20°
24
Smoky haze
19°
25
Smoky haze
17°
26
Overcast
19°
27
Sunny
15°
28
Sunny
18°
29
Sunny
19°
30
Sunny
21°

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
 21° /9° 0 mm 0 cm
Sept. 2 Sunny
Sunny
 19° /8° 0 mm 0 cm
Sept. 3 Sunny
Sunny
 19° /8° 0 mm 0 cm
Sept. 4 Sunny
Sunny
 20° /8° 0 mm 0 cm
Sept. 5 Sunny
Sunny
 21° /9° 0 mm 0 cm
Sept. 6 Sunny
Sunny
 20° /9° 0 mm 0 cm
Sept. 7 Sunny
Sunny
 20° /8° 0 mm 0 cm
Sept. 8 Sunny
Sunny
 20° /8° 0 mm 0 cm
Sept. 9 Sunny
Sunny
 19° /8° 0 mm 0 cm
Sept. 10 Overcast
Overcast
 17° /7° 0.3 mm 0 cm
Sept. 11 Sunny
Sunny
 17° /5° 0 mm 0 cm
Sept. 12 Sunny
Sunny
 18° /5° 8.1 mm 0 cm
Sept. 13 Sunny
Sunny
 18° /6° 0 mm 0 cm
Sept. 14 Cloudy
Cloudy
 19° /6° 0 mm 0 cm
Sept. 15 Sunny
Sunny
 18° /6° 0 mm 0 cm
Sept. 16 Patchy light snow with thunder
Patchy light snow with thunder
 14° /5° 0.8 mm 0.3 cm
Sept. 17 Cloudy
Cloudy
 15° /5° 0 mm 0 cm
Sept. 18 Thundery outbreaks possible
Thundery outbreaks possible
 14° /5° 1.5 mm 0 cm
Sept. 19 Moderate or heavy rain shower
Moderate or heavy rain shower
 14° /5° 9 mm 0 cm
Sept. 20 Sunny
Sunny
 17° /6° 0 mm 0 cm
Sept. 21 Smoky haze
Smoky haze
 17° /6° 7.7 mm 0 cm
Sept. 22 Smoky haze
Smoky haze
 19° /5° 0 mm 0 cm
Sept. 23 Smoky haze
Smoky haze
 20° /8° 0 mm 0 cm
Sept. 24 Smoky haze
Smoky haze
 19° /8° 0 mm 0 cm
Sept. 25 Smoky haze
Smoky haze
 17° /7° 0 mm 0 cm
Sept. 26 Overcast
Overcast
 19° /6° 0 mm 0 cm
Sept. 27 Sunny
Sunny
 15° /4° 0 mm 0 cm
Sept. 28 Sunny
Sunny
 18° /3° 0 mm 0 cm
Sept. 29 Sunny
Sunny
 19° /6° 0 mm 0 cm
Sept. 30 Sunny
Sunny
 21° /7° 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 17° and cooler nights around 9°. 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 42.6 mm across approximately 5 days. Occasional showers are possible, and planning ahead for them could be helpful.

Will it snow in Mariposa County in September 2026?
Mariposa County typically sees 0.5 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 2026

Track daily snowfall levels and discover Mariposa County’s snowy potential this September ❄️
On average, Mariposa County sees 1 snowy days during September, with approximately 0.5 cm of total snowfall.

September rainfall patterns in Mariposa County

Explore the daily rainfall trends and prepare for Mariposa Countys September weather 💧
Typically, Mariposa County has 5 rainy days in September with a total of 42.6 mm of rainfall.

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 37.848 and longitude -119.557. Stay updated with localized weather information tailored for Mariposa County.

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