Monterey (CA)
September
Weather in Monterey, California for September 2025
Your guide to Monterey weather in September - trends and predictions
The forecast for the first days of September 2025 in Monterey predicts temperatures to be around 20 °F, close to the historical average.
In general, the average temperature in Monterey at the beginning of September is 21 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.3 °F by the end of September.
With an average of 3 rainy days, Monterey experiences minimal rainfall in September.
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Temperatures
Rain 🌧️
More
27
Dry days
3
Rainy days
0
Snow days
18°/12°
Temperatures
14 km/h
Avg max wind
80 %
Avg humidity
Monterey Weather September
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Temperatures trend during September in Monterey
See the weather trend as well as the moving average line
September weather in Monterey day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 20° /13° | 0 mm | 5 | |
| Sept. 2 | Sunny | 21° /13° | 0 mm | 5 | |
| Sept. 3 | Sunny | 22° /13° | 0 mm | 5 | |
| Sept. 4 | Sunny | 20° /12° | 0 mm | 5 | |
| Sept. 5 | Sunny | 20° /12° | 0 mm | 5 | |
| Sept. 6 |  Overcast | 22° /14° | 0 mm | 5 | |
| Sept. 7 | Sunny | 22° /14° | 0 mm | 6 | |
| Sept. 8 | Sunny | 22° /14° | 0 mm | 6 | |
| Sept. 9 | Sunny | 19° /12° | 0 mm | 5 | |
| Sept. 10 | Sunny | 18° /12° | 0 mm | 5 | |
| Sept. 11 | Sunny | 18° /12° | 0 mm | 5 | |
| Sept. 12 |  Patchy rain possible | 19° /12° | 0.1 mm | 4 | |
| Sept. 13 | Sunny | 19° /11° | 0 mm | 5 | |
| Sept. 14 |  Cloudy | 17° /11° | 0 mm | 4 | |
| Sept. 15 | Patchy rain possible | 17° /11° | 1.6 mm | 4 | |
| Sept. 16 |  Moderate rain at times | 16° /12° | 3.2 mm | 4 | |
| Sept. 17 | Overcast | 15° /11° | 0 mm | 4 | |
| Sept. 18 | Patchy rain possible | 16° /12° | 0.3 mm | 4 | |
| Sept. 19 | Overcast | 16° /12° | 0 mm | 4 | |
| Sept. 20 | Overcast | 15° /11° | 0 mm | 4 | |
| Sept. 21 | Cloudy | 16° /11° | 0 mm | 4 | |
| Sept. 22 | Cloudy | 17° /12° | 0 mm | 4 | |
| Sept. 23 |  Partly cloudy | 20° /13° | 0 mm | 6 | |
| Sept. 24 | Cloudy | 19° /13° | 0 mm | 4 | |
| Sept. 25 | Patchy rain possible | 16° /12° | 0.1 mm | 4 | |
| Sept. 26 | Cloudy | 17° /11° | 0 mm | 4 | |
| Sept. 27 | Partly cloudy | 19° /12° | 0 mm | 5 | |
| Sept. 28 | Cloudy | 16° /12° | 0 mm | 4 | |
| Sept. 29 | Cloudy | 16° /11° | 0 mm | 4 | |
| Sept. 30 | Partly cloudy | 18° /12° | 0 mm | 5 | |
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Important Notice
Our weather forecast for Monterey 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 forecast closer to your planned date for the most up-to-date weather information.
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Monterey in September - FAQ
What are the expected maximum and minimum temperatures in Monterey during September?
Enjoy moderate daytime temperatures of up to 18° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Monterey during September?
Rainfall in Monterey during September is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 3 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 during September?
The average wind speed in Monterey during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Monterey
Explore the daily rainfall trends and prepare for Montereys September weather 💧
UV exposure in Monterey during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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