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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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Average dry days
16
Dry days
Average rainy days
14
Rainy days
Average snowy days
0
Snow days
Average temperatures
26°/17°
Temperatures
Average wind speed
17 km/h
Avg max wind
Average humidity
70 %
Avg humidity

Pasadena in September average weather

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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
Sunny
28° /19° 2.5 mm 7
Sept. 2 Sunny
Sunny
27° /17° 0 mm 7
Sept. 3 Sunny
Sunny
29° /16° 0 mm 8
Sept. 4 Thundery outbreaks possible
Thundery outbreaks possible
30° /19° 0.2 mm 7
Sept. 5 Sunny
Sunny
31° /20° 0 mm 8
Sept. 6 Sunny
Sunny
31° /21° 0.9 mm 7
Sept. 7 Patchy rain possible
Patchy rain possible
29° /20° 0.2 mm 7
Sept. 8 Partly cloudy
Partly cloudy
29° /16° 2.5 mm 8
Sept. 9 Patchy light rain with thunder
Patchy light rain with thunder
27° /17° 3.5 mm 7
Sept. 10 Moderate or heavy rain shower
Moderate or heavy rain shower
29° /18° 8.8 mm 7
Sept. 11 Patchy rain possible
Patchy rain possible
28° /18° 0.6 mm 7
Sept. 12 Mist
Mist
28° /19° 0 mm 7
Sept. 13 Moderate or heavy rain shower
Moderate or heavy rain shower
26° /18° 3.8 mm 7
Sept. 14 Sunny
Sunny
27° /18° 0 mm 7
Sept. 15 Sunny
Sunny
26° /15° 0 mm 7
Sept. 16 Sunny
Sunny
26° /15° 5.3 mm 6
Sept. 17 Heavy rain
Heavy rain
22° /18° 9.3 mm 5
Sept. 18 Light drizzle
Light drizzle
22° /17° 3.4 mm 5
Sept. 19 Sunny
Sunny
23° /15° 12.7 mm 6
Sept. 20 Cloudy
Cloudy
25° /17° 0 mm 5
Sept. 21 Cloudy
Cloudy
25° /18° 27.4 mm 6
Sept. 22 Patchy rain possible
Patchy rain possible
22° /16° 0.1 mm 5
Sept. 23 Light rain shower
Light rain shower
20° /15° 38.6 mm 5
Sept. 24 Light rain shower
Light rain shower
19° /16° 75.3 mm 4
Sept. 25 Patchy rain possible
Patchy rain possible
20° /17° 4.2 mm 5
Sept. 26 Light rain
Light rain
21° /18° 3.1 mm 5
Sept. 27 Patchy rain possible
Patchy rain possible
21° /17° 12.2 mm 5
Sept. 28 Overcast
Overcast
22° /16° 7.1 mm 5
Sept. 29 Light rain shower
Light rain shower
20° /17° 1.6 mm 5
Sept. 30 Patchy rain possible
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.

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Location coordinates Where is Pasadena?

Get accurate weather forecasts for Pasadena, located at latitude 39.107 and longitude -76.571. Stay updated with localized weather information tailored for Pasadena.

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