Mariposa County (Yosemite Valley)
September
Weather in Mariposa County for September 2025
Your guide to Mariposa County weather in September - trends and predictions
Snowfall in Mariposa County during September is quite rare, with fewer than 2 snowy days on average.
In general, the average temperature in Mariposa County at the beginning of September is 25.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21.4 °F by the end of September.
Precipitation in Mariposa County during September is a rare event, with an average of fewer than 2 rainy days.
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Snow Forecast ❄️
Temperatures
Rain 🌧️
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28
Dry days
1
Rainy days
1
Snow days
20°/11°
Temperatures
18 km/h
Avg max wind
35 %
Avg humidity
Mariposa County in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  24° | 2 23° | 3 24° | 4 26° | 5 27° | 6 27° | 7 25° |
| 8 24° | 9 23° | 10  22° | 11 19° | 12 18° | 13 21° | 14  21° |
| 15 17° | 16  8° | 17 9° | 18  9° | 19  10° | 20 17° | 21 17° |
| 22 19° | 23 22° | 24 21° | 25 20° | 26 21° | 27 22° | 28 22° |
| 29 22° | 30 22° |
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Temperatures trend during September in Mariposa County
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| Sept. 1 | Sunny | 24° /14° | 0 mm | 0 cm | |
| Sept. 2 | Sunny | 23° /13° | 0 mm | 0 cm | |
| Sept. 3 | Sunny | 24° /13° | 0 mm | 0 cm | |
| Sept. 4 | Sunny | 26° /14° | 0 mm | 0 cm | |
| Sept. 5 | Sunny | 27° /16° | 0.1 mm | 0 cm | |
| Sept. 6 | Sunny | 27° /17° | 0 mm | 0 cm | |
| Sept. 7 | Sunny | 25° /16° | 0 mm | 0 cm | |
| Sept. 8 | Sunny | 24° /15° | 0 mm | 0 cm | |
| Sept. 9 | Sunny | 23° /13° | 0 mm | 0 cm | |
| Sept. 10 | Cloudy | 22° /12° | 0 mm | 0 cm | |
| Sept. 11 | Sunny | 19° /7° | 0 mm | 0 cm | |
| Sept. 12 | Sunny | 18° /7° | 0 mm | 0 cm | |
| Sept. 13 | Sunny | 21° /9° | 0 mm | 0 cm | |
| Sept. 14 | Partly cloudy | 21° /10° | 0 mm | 0 cm | |
| Sept. 15 | Sunny | 17° /7° | 0 mm | 0 cm | |
| Sept. 16 | Moderate or heavy snow showers | 8° /1° | 1.9 mm | 0.2 cm | |
| Sept. 17 | Partly cloudy | 9° /1° | 0 mm | 0 cm | |
| Sept. 18 | Thundery outbreaks possible | 9° /6° | 0 mm | 0 cm | |
| Sept. 19 | Torrential rain shower | 10° /7° | 35.9 mm | 0 cm | |
| Sept. 20 | Sunny | 17° /8° | 0 mm | 0 cm | |
| Sept. 21 | Sunny | 17° /11° | 0 mm | 0 cm | |
| Sept. 22 | Sunny | 19° /12° | 0 mm | 0 cm | |
| Sept. 23 | Sunny | 22° /14° | 0 mm | 0 cm | |
| Sept. 24 | Cloudy | 21° /13° | 0 mm | 0 cm | |
| Sept. 25 | Sunny | 20° /14° | 0 mm | 0 cm | |
| Sept. 26 | Sunny | 21° /13° | 0 mm | 0 cm | |
| Sept. 27 | Sunny | 22° /14° | 0 mm | 0 cm | |
| Sept. 28 | Sunny | 22° /16° | 0 mm | 0 cm | |
| Sept. 29 | Sunny | 22° /15° | 0 mm | 0 cm | |
| Sept. 30 | Partly cloudy | 22° /13° | 0 mm | 0 cm | |
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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.
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 ☀️
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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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