Monterey County
September
Weather in Monterey County for September 2025
Your guide to Monterey County weather in September - trends and predictions
In general, the average temperature in Monterey County at the beginning of September is 23.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20 °F by the end of September.
With an average of 2 rainy days, Monterey County experiences minimal rainfall in September, ensuring that most days remain pleasantly dry.
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28
Dry days
2
Rainy days
0
Snow days
21°/11°
Temperatures
15 km/h
Avg max wind
82 %
Avg humidity
Monterey County in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  21° | 2 22° | 3  24° | 4 24° | 5 25° | 6 23° | 7 23° |
| 8 24° | 9  24° | 10 22° | 11 21° | 12  21° | 13 21° | 14  20° |
| 15 20° | 16 19° | 17 18° | 18 18° | 19 17° | 20  18° | 21 19° |
| 22 19° | 23 21° | 24 20° | 25 19° | 26 21° | 27 21° | 28 20° |
| 29 20° | 30 19° |
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Temperatures trend during September in Monterey County
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September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 | Mist | 21° /11° | 0 mm | 6 | |
| Sept. 2 | Mist | 22° /11° | 0 mm | 6 | |
| Sept. 3 | Overcast | 24° /11° | 0 mm | 6 | |
| Sept. 4 | Mist | 24° /12° | 0 mm | 6 | |
| Sept. 5 | Mist | 25° /12° | 0 mm | 6 | |
| Sept. 6 | Mist | 23° /11° | 0 mm | 6 | |
| Sept. 7 | Mist | 23° /11° | 0 mm | 6 | |
| Sept. 8 | Mist | 24° /11° | 0 mm | 6 | |
| Sept. 9 | Partly cloudy | 24° /11° | 0 mm | 7 | |
| Sept. 10 | Mist | 22° /10° | 0 mm | 6 | |
| Sept. 11 | Overcast | 21° /10° | 0 mm | 6 | |
| Sept. 12 | Light rain | 21° /11° | 1.1 mm | 5 | |
| Sept. 13 | Mist | 21° /10° | 0 mm | 6 | |
| Sept. 14 | Cloudy | 20° /10° | 0 mm | 5 | |
| Sept. 15 | Mist | 20° /11° | 0 mm | 5 | |
| Sept. 16 | Mist | 19° /10° | 0.9 mm | 5 | |
| Sept. 17 | Mist | 18° /11° | 0 mm | 4 | |
| Sept. 18 | Mist | 18° /11° | 0 mm | 4 | |
| Sept. 19 | Mist | 17° /12° | 0 mm | 4 | |
| Sept. 20 | Patchy rain possible | 18° /11° | 0 mm | 5 | |
| Sept. 21 | Patchy rain possible | 19° /10° | 0 mm | 5 | |
| Sept. 22 | Overcast | 19° /10° | 0 mm | 5 | |
| Sept. 23 | Mist | 21° /11° | 0 mm | 6 | |
| Sept. 24 | Overcast | 20° /10° | 0 mm | 5 | |
| Sept. 25 | Mist | 19° /10° | 0 mm | 5 | |
| Sept. 26 | Overcast | 21° /11° | 0 mm | 5 | |
| Sept. 27 | Mist | 21° /10° | 0 mm | 6 | |
| Sept. 28 | Overcast | 20° /10° | 0 mm | 5 | |
| Sept. 29 | Mist | 20° /10° | 0 mm | 5 | |
| Sept. 30 | Light rain shower | 19° /11° | 2.4 mm | 5 | |
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Important Notice
Our weather forecast for Monterey 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 Monterey County forecast closer to your planned date for the most up-to-date weather information.
Monterey County in September - FAQ
What are the expected maximum and minimum temperatures in Monterey County during September?
Enjoy moderate daytime temperatures of up to 21° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Monterey County during September?
Rainfall in Monterey County during September is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 2 days seeing any precipitation. Planning without the concern for rain is generally straightforward during this very dry period.
What are the typical wind conditions in Monterey County during September?
The average wind speed in Monterey County during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
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Where is Monterey County?Get accurate weather forecasts for Monterey County, located at latitude 36.678 and longitude -121.656. Stay updated with localized weather information tailored for Monterey County.
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