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Weather in San Diego, California for September 2026

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

    Temperatures

  • So far, September 2026 in San Diego shows a warmer trend than usual by 3.6 °F.

  • Expect cooler weather in the next days in San Diego with the forecast suggesting a temperature of 23.6 °F, lower than the historical average.

  • In general, the average temperature in San Diego at the beginning of September is 27.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21.9 °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
74 %
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
26°
2
Sunny
27°
3
Sunny
26°
4
Sunny
26°
5
Sunny
28°
6
Overcast
28°
7
Partly cloudy
30°
8
Partly cloudy
31°
9
Partly cloudy
29°
10
Sunny
25°
11
Sunny
24°
12
Sunny
23°
13
Sunny
22°
14
Sunny
22°
15
Sunny
22°
16
Sunny
23°
17
Sunny
25°
18
Sunny
25°
19
Sunny
26°
20
Sunny
24°
21
Sunny
23°
22
Sunny
23°
23
Partly cloudy
24°
24
Mist
23°
25
Mist
23°
26
Overcast
21°
27
Cloudy
21°
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
 26° /18° 0 mm 7
Sept. 2 Sunny
Sunny
 27° /19° 0 mm 7
Sept. 3 Sunny
Sunny
 26° /19° 0 mm 8
Sept. 4 Sunny
Sunny
 26° /19° 0 mm 7
Sept. 5 Sunny
Sunny
 28° /19° 0 mm 7
Sept. 6 Overcast
Overcast
 28° /20° 0.1 mm 5
Sept. 7 Partly cloudy
Partly cloudy
 30° /20° 0 mm 6
Sept. 8 Partly cloudy
Partly cloudy
 31° /22° 0 mm 8
Sept. 9 Partly cloudy
Partly cloudy
 29° /21° 0.1 mm 7
Sept. 10 Sunny
Sunny
 25° /23° 0.4 mm 9.2
Sept. 11 Sunny
Sunny
 24° /22° 0 mm 9
Sept. 12 Sunny
Sunny
 23° /21° 0 mm 9.3
Sept. 13 Sunny
Sunny
 22° /20° 0 mm 9.2
Sept. 14 Sunny
Sunny
 22° /20° 0 mm 6
Sept. 15 Sunny
Sunny
 22° /20° 0 mm 6
Sept. 16 Sunny
Sunny
 23° /21° 0 mm 6
Sept. 17 Sunny
Sunny
 25° /22° 0 mm 6
Sept. 18 Sunny
Sunny
 25° /23° 0 mm 6
Sept. 19 Sunny
Sunny
 26° /23° 1 mm 7
Sept. 20 Sunny
Sunny
 24° /22° 0 mm 6
Sept. 21 Sunny
Sunny
 23° /21° 0 mm 6
Sept. 22 Sunny
Sunny
 23° /21° 0 mm 6
Sept. 23 Partly cloudy
Partly cloudy
 24° /18° 0 mm 6
Sept. 24 Mist
Mist
 23° /17° 0 mm 5
Sept. 25 Mist
Mist
 23° /16° 0 mm 5
Sept. 26 Overcast
Overcast
 21° /16° 0 mm 5
Sept. 27 Cloudy
Cloudy
 21° /15° 0 mm 5
Sept. 28 Cloudy
Cloudy
 22° /16° 0 mm 5
Sept. 29 Cloudy
Cloudy
 22° /16° 0 mm 5
Sept. 30 Patchy rain possible
Patchy rain possible
 21° /16° 1.6 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.
Change Month
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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 💧
Typically, San Diego has 1 rainy days in September with a total of 4.4 mm of rainfall.

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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