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 33.9 °F. As the month progressed, temperatures tended to moderately rise, reaching an average of 34.4 °F by the end of September.
The climate of Pasadena in September is notably wet, with an average of 12 rainy days.
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18
Dry days
12
Rainy days
0
Snow days
36°/26°
Temperatures
19 km/h
Avg max wind
61 %
Avg humidity
Pasadena in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  34° | 2  34° | 3 35° | 4 32° | 5  32° | 6 34° | 7  36° |
| 8  35° | 9  34° | 10 34° | 11 32° | 12  33° | 13 35° | 14  33° |
| 15 34° | 16 33° | 17 36° | 18 35° | 19 34° | 20 34° | 21 34° |
| 22 35° | 23 34° | 24 34° | 25 34° | 26 33° | 27 34° | 28 36° |
| 29 34° | 30 36° |
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Temperatures trend during September in Pasadena
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September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 | Partly cloudy | 34° /25° | 5.7 mm | 8 | |
| Sept. 2 | Patchy rain possible | 34° /24° | 3.3 mm | 8 | |
| Sept. 3 | Partly cloudy | 35° /25° | 0.3 mm | 8 | |
| Sept. 4 | Light rain shower | 32° /25° | 6.5 mm | 7 | |
| Sept. 5 | Mist | 32° /25° | 3 mm | 7 | |
| Sept. 6 | Partly cloudy | 34° /25° | 0.3 mm | 8 | |
| Sept. 7 | Sunny | 36° /24° | 0 mm | 9 | |
| Sept. 8 | Cloudy | 35° /23° | 0 mm | 8 | |
| Sept. 9 | Thundery outbreaks possible | 34° /22° | 0.2 mm | 8 | |
| Sept. 10 | Cloudy | 34° /24° | 3.7 mm | 7 | |
| Sept. 11 | Partly cloudy | 32° /23° | 12.1 mm | 8 | |
| Sept. 12 | Overcast | 33° /24° | 0.1 mm | 7 | |
| Sept. 13 | Partly cloudy | 35° /23° | 0 mm | 9 | |
| Sept. 14 | Moderate or heavy rain shower | 33° /24° | 7.5 mm | 8 | |
| Sept. 15 | Moderate or heavy rain shower | 34° /24° | 1.5 mm | 8 | |
| Sept. 16 | Patchy rain possible | 33° /25° | 0.9 mm | 8 | |
| Sept. 17 | Light rain shower | 36° /26° | 0.8 mm | 8 | |
| Sept. 18 | Patchy rain possible | 35° /24° | 0.2 mm | 8 | |
| Sept. 19 | Partly cloudy | 34° /24° | 0 mm | 8 | |
| Sept. 20 | Patchy rain possible | 34° /25° | 0.1 mm | 8 | |
| Sept. 21 | Thundery outbreaks possible | 34° /25° | 0.2 mm | 8 | |
| Sept. 22 | Patchy rain possible | 35° /26° | 0 mm | 8 | |
| Sept. 23 | Overcast | 34° /25° | 10.5 mm | 8 | |
| Sept. 24 | Mist | 34° /24° | 15.2 mm | 8 | |
| Sept. 25 | Overcast | 34° /26° | 0 mm | 8 | |
| Sept. 26 | Patchy rain possible | 33° /23° | 3.7 mm | 8 | |
| Sept. 27 | Thundery outbreaks possible | 34° /24° | 0.2 mm | 8 | |
| Sept. 28 | Patchy rain possible | 36° /24° | 0 mm | 9 | |
| Sept. 29 | Patchy rain possible | 34° /24° | 0.1 mm | 8 | |
| Sept. 30 | Patchy rain possible | 36° /24° | 0.3 mm | 9 | |
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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?
With daytime temperatures soaring above 36° and not dropping much below 26° at night, September in Pasadena is quite hot. Staying hydrated and avoiding peak sun hours is advisable.
How much rainfall should be expected in Pasadena during September?
In September, Pasadena can expect light to moderate rainfall, totaling 30.7 mm across approximately 12 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Pasadena during September?
The average wind speed in Pasadena during September is 19 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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