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Weather in San Diego, California for September 2025

Your guide to San Diego weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in San Diego is slightly cooler than the historical average by -1 °F.

  • The forecast for the next days in San Diego predicts temperatures to be around 25 °F, close to the historical average.

  • In general, the average temperature in San Diego at the beginning of September is 25.9 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 23.9 °F by the end of September.

    • Rain 🌧️

  • Precipitation in San Diego during September is a rare event, with an average of fewer than 2 rainy days.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
29
Dry days
Average rainy days
1
Rainy days
Average snowy days
0
Snow days
Average temperatures
23°/18°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
72 %
Avg humidity

San Diego Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Cloudy
25°
2
Overcast
26°
3
Mist
25°
4
Overcast
25°
5
Overcast
27°
6
Overcast
26°
7
Partly cloudy
27°
8
Partly cloudy
29°
9
Partly cloudy
27°
10
Overcast
26°
11
Cloudy
25°
12
Mist
22°
13
Cloudy
22°
14
Partly cloudy
24°
15
Partly cloudy
26°
16
Partly cloudy
27°
17
Partly cloudy
28°
18
Patchy rain possible
26°
19
Patchy rain possible
25°
20
Patchy rain possible
24°
21
Partly cloudy
21°
22
Sunny
23°
23
Sunny
23°
24
Sunny
24°
25
Sunny
26°
26
Sunny
26°
27
Sunny
26°
28
Cloudy
22°
29
Cloudy
22°
30
Patchy rain possible
21°

Temperatures trend during September in San Diego

See the weather trend as well as the moving average line

September weather in San Diego day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Cloudy
Cloudy
 25° /19° 0 mm 6
Sept. 2 Overcast
Overcast
 26° /20° 0 mm 6
Sept. 3 Mist
Mist
 25° /20° 0 mm 6
Sept. 4 Overcast
Overcast
 25° /20° 0 mm 6
Sept. 5 Overcast
Overcast
 27° /20° 0 mm 6
Sept. 6 Overcast
Overcast
 26° /20° 0 mm 6
Sept. 7 Partly cloudy
Partly cloudy
 27° /20° 0 mm 7
Sept. 8 Partly cloudy
Partly cloudy
 29° /21° 0 mm 7
Sept. 9 Partly cloudy
Partly cloudy
 27° /21° 0 mm 7
Sept. 10 Overcast
Overcast
 26° /20° 0 mm 6
Sept. 11 Cloudy
Cloudy
 25° /19° 0 mm 6
Sept. 12 Mist
Mist
 22° /18° 0 mm 5
Sept. 13 Cloudy
Cloudy
 22° /17° 0 mm 5
Sept. 14 Partly cloudy
Partly cloudy
 24° /19° 0 mm 2
Sept. 15 Partly cloudy
Partly cloudy
 26° /18° 0 mm 2
Sept. 16 Partly cloudy
Partly cloudy
 27° /20° 0 mm 2
Sept. 17 Partly cloudy
Partly cloudy
 28° /23° 0 mm 2
Sept. 18 Patchy rain possible
Patchy rain possible
 26° /23° 0.1 mm 0
Sept. 19 Patchy rain possible
Patchy rain possible
 25° /22° 0.7 mm 5
Sept. 20 Patchy rain possible
Patchy rain possible
 24° /21° 0.4 mm 5
Sept. 21 Partly cloudy
Partly cloudy
 21° /19° 0 mm 5
Sept. 22 Sunny
Sunny
 23° /18° 0 mm 6
Sept. 23 Sunny
Sunny
 23° /19° 0 mm 6
Sept. 24 Sunny
Sunny
 24° /19° 0 mm 6
Sept. 25 Sunny
Sunny
 26° /20° 0 mm 6
Sept. 26 Sunny
Sunny
 26° /21° 0 mm 6
Sept. 27 Sunny
Sunny
 26° /21° 0 mm 6
Sept. 28 Cloudy
Cloudy
 22° /16° 0 mm 5
Sept. 29 Cloudy
Cloudy
 22° /15° 0 mm 5
Sept. 30 Patchy rain possible
Patchy rain possible
 21° /15° 2.3 mm 5
Next
Important Notice
Our weather forecast for San Diego 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 San Diego forecast closer to your planned date for the most up-to-date weather information.
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San Diego in September - FAQ

What are the expected maximum and minimum temperatures in San Diego during September?
During September, expect a variety of temperatures with highs around 23° and lows near 18°, suitable for diverse activities and preferences.
How much rainfall should be expected in San Diego during September?
Rainfall in San Diego during September is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 1 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 San Diego during September?
The average wind speed in San Diego during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in San Diego

Explore the daily rainfall trends and prepare for San Diegos September weather 💧

UV exposure in San Diego during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

Quick links

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Location coordinates Where is San Diego?

Get accurate weather forecasts for San Diego, located at latitude 32.716 and longitude -117.165. Stay updated with localized weather information tailored for San Diego.

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