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Mariposa County (Yosemite National Park)
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United States weather

Weather in Mariposa County, California for September 2027

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

    Temperatures

  • In general, the average temperature in Mariposa County at the beginning of September is 19.6 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 17.3 °C by the end of September.

    • Rain 🌧️

  • With an average of 3 rainy days, Mariposa County experiences minimal rainfall in September.

    • More

  • Is September a good time to visit Mariposa County? check out the best time to travel to Mariposa County page.

  • ✨ Is September a good time to visit Mariposa County? – Ask the AI Weatherman

Average dry days
27
Dry days
Average rainy days
3
Rainy days
Average snowy days
0
Snow days
Average temperatures
18°/8°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
47 %
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
20°
2
Sunny
18°
3
Sunny
19°
4
Sunny
19°
5
Sunny
20°
6
Sunny
20°
7
Sunny
20°
8
Sunny
20°
9
Sunny
19°
10
Overcast
17°
11
Sunny
16°
12
Light rain
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
13°
20
Sunny
17°
21
Patchy rain possible
16°
22
Partly cloudy
18°
23
Sunny
20°
24
Partly cloudy
19°
25
Light rain
16°
26
Sunny
18°
27
Patchy rain possible
17°
28
Patchy rain possible
15°
29
Sunny
17°
30
Cloudy
17°

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
 20° /9° 0 mm 0 cm
Sept. 2 Sunny
Sunny
 18° /9° 0 mm 0 cm
Sept. 3 Sunny
Sunny
 19° /8° 0 mm 0 cm
Sept. 4 Sunny
Sunny
 19° /9° 0 mm 0 cm
Sept. 5 Sunny
Sunny
 20° /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° /9° 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
 16° /6° 0 mm 0 cm
Sept. 12 Light rain
Light rain
 18° /6° 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
 13° /5° 9 mm 0 cm
Sept. 20 Sunny
Sunny
 17° /7° 0 mm 0 cm
Sept. 21 Patchy rain possible
Patchy rain possible
 16° /8° 1.7 mm 0 cm
Sept. 22 Partly cloudy
Partly cloudy
 18° /7° 0.3 mm 0 cm
Sept. 23 Sunny
Sunny
 20° /9° 0 mm 0 cm
Sept. 24 Partly cloudy
Partly cloudy
 19° /10° 0 mm 0 cm
Sept. 25 Light rain
Light rain
 16° /9° 7.6 mm 0 cm
Sept. 26 Sunny
Sunny
 18° /8° 0 mm 0 cm
Sept. 27 Patchy rain possible
Patchy rain possible
 17° /8° 1.3 mm 0 cm
Sept. 28 Patchy rain possible
Patchy rain possible
 15° /8° 1.1 mm 0 cm
Sept. 29 Sunny
Sunny
 17° /7° 0 mm 0 cm
Sept. 30 Cloudy
Cloudy
 17° /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.
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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 18° and cooler nights around 8°. 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 31.9 mm across approximately 3 days. Occasional showers are possible, and planning ahead for them could be helpful.

Will it snow in Mariposa County in September 2027?
Mariposa County typically sees 0.3 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 2027

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 💧
Typically, Mariposa County has 3 rainy days in September with a total of 31.9 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
Select a location for an accurate weather forecast
Yosemite National ParkYosemite Valley
More Locations
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