Pasadena
September
Weather in Pasadena for September 2025
Your guide to Pasadena weather in September - trends and predictions
In general, the average temperature in Pasadena at the beginning of September is 29.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.7 °F by the end of September.
The climate of Pasadena in September is notably wet, with an average of 14 rainy days.
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16
Dry days
14
Rainy days
0
Snow days
26°/17°
Temperatures
17 km/h
Avg max wind
70 %
Avg humidity
Pasadena in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  28° | 2 27° | 3 29° | 4  30° | 5 31° | 6 31° | 7  29° |
| 8  29° | 9  27° | 10  29° | 11 28° | 12  28° | 13 26° | 14 27° |
| 15 26° | 16 26° | 17  22° | 18  22° | 19 23° | 20  25° | 21 25° |
| 22 22° | 23 20° | 24 19° | 25 20° | 26 21° | 27 21° | 28  22° |
| 29 20° | 30 22° |
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Temperatures trend during September in Pasadena
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 | Sunny | 28° /19° | 2.5 mm | 7 | |
| Sept. 2 | Sunny | 27° /17° | 0 mm | 7 | |
| Sept. 3 | Sunny | 29° /16° | 0 mm | 8 | |
| Sept. 4 | Thundery outbreaks possible | 30° /19° | 0.2 mm | 7 | |
| Sept. 5 | Sunny | 31° /20° | 0 mm | 8 | |
| Sept. 6 | Sunny | 31° /21° | 0.9 mm | 7 | |
| Sept. 7 | Patchy rain possible | 29° /20° | 0.2 mm | 7 | |
| Sept. 8 | Partly cloudy | 29° /16° | 2.5 mm | 8 | |
| Sept. 9 | Patchy light rain with thunder | 27° /17° | 3.5 mm | 7 | |
| Sept. 10 | Moderate or heavy rain shower | 29° /18° | 8.8 mm | 7 | |
| Sept. 11 | Patchy rain possible | 28° /18° | 0.6 mm | 7 | |
| Sept. 12 | Mist | 28° /19° | 0 mm | 7 | |
| Sept. 13 | Moderate or heavy rain shower | 26° /18° | 3.8 mm | 7 | |
| Sept. 14 | Sunny | 27° /18° | 0 mm | 7 | |
| Sept. 15 | Sunny | 26° /15° | 0 mm | 7 | |
| Sept. 16 | Sunny | 26° /15° | 5.3 mm | 6 | |
| Sept. 17 | Heavy rain | 22° /18° | 9.3 mm | 5 | |
| Sept. 18 | Light drizzle | 22° /17° | 3.4 mm | 5 | |
| Sept. 19 | Sunny | 23° /15° | 12.7 mm | 6 | |
| Sept. 20 | Cloudy | 25° /17° | 0 mm | 5 | |
| Sept. 21 | Cloudy | 25° /18° | 27.4 mm | 6 | |
| Sept. 22 | Patchy rain possible | 22° /16° | 0.1 mm | 5 | |
| Sept. 23 | Light rain shower | 20° /15° | 38.6 mm | 5 | |
| Sept. 24 | Light rain shower | 19° /16° | 75.3 mm | 4 | |
| Sept. 25 | Patchy rain possible | 20° /17° | 4.2 mm | 5 | |
| Sept. 26 | Light rain | 21° /18° | 3.1 mm | 5 | |
| Sept. 27 | Patchy rain possible | 21° /17° | 12.2 mm | 5 | |
| Sept. 28 | Overcast | 22° /16° | 7.1 mm | 5 | |
| Sept. 29 | Light rain shower | 20° /17° | 1.6 mm | 5 | |
| Sept. 30 | Patchy rain possible | 22° /16° | 0.3 mm | 5 | |
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Important Notice
Our weather forecast for Pasadena 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 Pasadena forecast closer to your planned date for the most up-to-date weather information.
Pasadena in September - FAQ
What are the expected maximum and minimum temperatures in Pasadena during September?
During September, expect a variety of temperatures with highs around 26° and lows near 17°, suitable for diverse activities and preferences.
How much rainfall should be expected in Pasadena during September?
Significant rainfall exceeding 220.2 mm is expected in Pasadena during September, occurring over more than 14 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Pasadena during September?
The average wind speed in Pasadena during September is 17 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Pasadena
Explore the daily rainfall trends and prepare for Pasadenas September weather 💧
UV exposure in Pasadena during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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