San Diego County Weather Forecast
San Diego County weather: 69°F, mainly clear. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
Risk assessment for San Diego County
Derived from the current forecast window - not an official warning.
Peak gusts of 12 mph and 0 thunderstorm days in the next 16 days.
Wettest single day forecast at 0,1 in, 0,1 in across the window. Flash flooding risk rises sharply above 50 mm in a day.
16-day forecast for San Diego County
Daily highs and lows, precipitation and UV.
| Day | Conditions | High / Low | Precip | Wind | UV |
|---|---|---|---|---|---|
| Thu, Sep 17 | ☁️ Overcast | 77° / 69° | 2% | 10 mph | 7 |
| Fri, Sep 18 | ☁️ Overcast | 76° / 64° | 0% | 10 mph | 7 |
| Sat, Sep 19 | ⛅ Partly cloudy | 77° / 60° | 0% | 10 mph | 7 |
| Sun, Sep 20 | ☁️ Overcast | 75° / 69° | 0% | 10 mph | 7 |
| Mon, Sep 21 | 🌤️ Mainly clear | 73° / 68° | 2% | 10 mph | 7 |
| Tue, Sep 22 | ☀️ Clear sky | 75° / 67° | 3% | 12 mph | 7 |
| Wed, Sep 23 | ☀️ Clear sky | 75° / 68° | 1% | 10 mph | 7 |
| Thu, Sep 24 | ☀️ Clear sky | 77° / 69° | 2% | 10 mph | 7 |
| Fri, Sep 25 | ☀️ Clear sky | 80° / 69° | 3% | 12 mph | 7 |
| Sat, Sep 26 | ☀️ Clear sky | 82° / 72° | 3% | 11 mph | 7 |
| Sun, Sep 27 | 🌦️ Light drizzle | 76° / 72° | 3% · 0,1 in | 9 mph | 4 |
| Mon, Sep 28 | ☁️ Overcast | 77° / 70° | 3% | 9 mph | 7 |
| Tue, Sep 29 | ☀️ Clear sky | 75° / 69° | 6% | 10 mph | 7 |
| Wed, Sep 30 | ☁️ Overcast | 71° / 67° | 0% | 14 mph | 7 |
| Thu, Oct 1 | ☀️ Clear sky | 73° / 67° | 3% | 9 mph | 7 |
| Fri, Oct 2 | ☀️ Clear sky | 75° / 68° | 6% | 10 mph | 7 |
What this means for San Diego County
Today is about average for September. The forecast high of 77°F is in line with the 76°F typical for this month.
Rain is very unlikely today - plans do not need a backup.
No weather-related travel disruption is expected today. Roads and airports should run normally.
Northern Hemisphere, so peak summer falls in June to August.
The gap between the warmest and coldest month averages 47°F.
See the San Diego County forecast by time range
San Diego County weather - more answers
Explore San Diego County
Every topic we hold for this place, and the same topic for the places around it.
Weather for related places
Frequently asked questions
Where is San Diego County?
San Diego County is a county in California. Its coordinates are 32.7157, -117.1611. It lies in North America.
What is the weather like in San Diego County right now?
It is currently 69°F (20°C) with mainly clear. Humidity is 74% and wind is 3 mph.
When is the best time to visit San Diego County?
April, May, June, July, August, September and October offer the most comfortable conditions in San Diego County, which has a Mediterranean climate. January, February and March are usually the hardest months for outdoor plans.
What time zone is San Diego County in?
San Diego County observes America/Los_Angeles (UTC-07:00). The local time is 1:51 AM.
How many people live in San Diego County?
San Diego County has a population of approximately 3.3 million.
What is the nearest airport to San Diego County?
The closest airports are San Diego International Airport (SAN), 2 mi away, Los Angeles International Airport (LAX), 111 mi away and Harry Reid International Airport (LAS), 259 mi away.
What are the top things to do in San Diego County?
Popular options include Coronado Beach, Anza-Borrego Desert State Park, Disneyland Resort, Joshua Tree National Park, Santa Monica State Beach and Hollywood Sign.
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| Place data | USPOTUS Atlas dataset (us-counties) - coordinates, hierarchy and facts. |
|---|---|
| Forecast and observations | Open-Meteo (ECMWF and national models). |
| Air quality and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Climate averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National Weather Service. |
| Method | Scores, comparisons and advice on this page are computed from the inputs above. Distances are straight-line. Nothing is estimated where data is missing - the block is simply not shown. |
Last updated September 18, 2026 at 1:51 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
