San Diego in september: average Weather, Temperature and Climate
Weather in San Diego in september 2025
The weather in San Diego in september comes from statistical datas on the last years. You can view the weather statistics for the whole month, but also by using the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
perfect weather UV index: 7
Weather at 6am
74°F
Clear/Sunny
79% of time
14%
7%
2%
Weather at 12pm
79°F
Clear/Sunny
85% of time
9%
6%
1%
Weather at 6pm
72°F
Clear/Sunny
77% of time
13%
7%
3%
Weather at 3am
70°F
82%
12%
6%
2%
Evolution of daily average temperature and precipitation in San Diego in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in San Diego in september.
The climate of San Diego in september is perfect
The weather in september in San Diego is dry ; it never rains.
The climate comfortable there the month of september. The high seasonal norm is 81°F. The minimum is 74°F. Thus, the mean temperature average on this month of september in San Diego is 77°F. Note that these seasonal averages are in contrast with those observed in San Diego in september with a maximum record of 99°F in 2020 and a minimum record of 63°F in 2010. You can expect to have about 4 days with temperatures up to 86°F, or 13 of time.
On this month of september, day length in San Diego is generally 12:21. The sun rises at 05:33 and sunset is at 17:54.
With a perfect weather, this month is advisable to go in San Diego in United States.
Seasonal average climate and temperature of San Diego in september
Check below seasonal norms These statistics are set from the weather statements of the last years of the month of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 77°F | ||||
| Highest temperature | 81°F | ||||
| Lowest temperature | 74°F | ||||
| Highest record temperature | 99°F (2020) | ||||
| Lowest record temperature | 63°F (2010) | ||||
| Number of days at +86°F | 4 day(s) (13%) | ||||
| Number of days at +65°F | 30 day(s) (100%) | ||||
| Sea temperature | |||||
| Average sea temperature | 67°F | ||||
| Lowest sea temperature | 65°F | ||||
| Highest sea temperature | 70°F | ||||
| Wind | |||||
| Wind speed | 17km/h | ||||
| Wind temperature | 74°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 0.7in | ||||
| Number of days with rainfall | 1 day(s) (4%) | ||||
| Record daily rainfall | 1in (2016) | ||||
| Other climate data | |||||
| Humidity | 68% | ||||
| Visibility | 9.93km | ||||
| Cloud cover | 9% | ||||
| UV index | 7 | ||||
| Daily sunshine hours | 12 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 05:33 | ||||
| Time of sunset | 17:54 | ||||
| Length of day | 12:21 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | perfect | ||||
How was the weather last september?
Here is the day by day recorded weather in San Diego in september 2024:
70°F to 79°F
72°F to 81°F
74°F to 83°F
74°F to 85°F
76°F to 88°F
77°F to 90°F
79°F to 90°F
83°F to 92°F
81°F to 88°F
77°F to 86°F
70°F to 76°F
67°F to 74°F
67°F to 72°F
67°F to 74°F
67°F to 72°F
65°F to 70°F
63°F to 68°F
61°F to 68°F
61°F to 70°F
63°F to 68°F
63°F to 70°F
65°F to 76°F
65°F to 76°F
63°F to 74°F
65°F to 74°F
63°F to 70°F
61°F to 72°F
63°F to 74°F
63°F to 74°F
61°F to 74°F
Map: other cities in California in september
Cities near San Diego:
| Chula Vista in september | perfect weather |
| Encinitas in september | perfect weather |
| Carlsbad in september | perfect weather |
| Oceanside in september | perfect weather |
| Cleveland National Forest in september | perfect weather |
| Temecula in september | perfect weather |
| San Clemente in september | perfect weather |
| Anza-Borrego Desert State Park in september | perfect weather |
| Newport Beach in september | perfect weather |
| Huntington Beach in september | perfect weather |
| Palm Springs in september | perfect weather |
| San Bernardino in september | perfect weather |
Click over cities on the map for information about the weather in september.
San Diego
perfect weather
good
tolerable
bad
very bad
Weather data for San Diego in september:
Weather data for San Diego for september are derived from an average of the weather forecast since 2009 in San Diego. There is a margin of error and these forecasts are to be considered as general information only. The weather in San Diego can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to San Diego.