San Diego County Weather Forecast
San Diego County weather: 70°F, partly cloudy. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
Summary
San Diego County is a county in California. San Diego County is a county in the United States. It has a population of about 3.3 million.
Right now it is 70°F (21°C) in San Diego County with partly cloudy. It feels like 73°F. Today runs from 69°F to 78°F. Chance of precipitation is 0%. Sightseeing conditions score 7.4/10 - good conditions.
The best time to visit San Diego County is April, May, June, July, August, September and October. The climate is Mediterranean. January, February and March tend to be the least comfortable months. August is the warmest month with average highs near 78°F, while January is the coldest with lows near 48°F.
The closest major airport is San Diego International Airport (SAN), about 2 mi away. Nearby highlights include Coronado Beach, Anza-Borrego Desert State Park, Disneyland Resort and Joshua Tree National Park.
In plain terms. Today is about average for September. The forecast high of 78°F is in line with the 76°F typical for this month. The best window to be outside is roughly 10 AM to 1 PM, when temperature, rain chance and wind line up best. outdoors is the strongest bet in San Diego County today at 9.8/10. Visibility is down to 0,3 mi - use low beams and leave extra following distance.
Compiled from this page's own data: atlas facts plus live Open-Meteo readings.
Weather in San Diego County right now
Source: Open-Meteo. Updated 7:56 PM, Sep 20 local time.
See the San Diego County forecast by time range
Next 24 hours
Hour-by-hour temperature, precipitation chance and wind.
16-day forecast for San Diego County
Daily highs and lows, precipitation and UV.
| Day | Conditions | High / Low | Precip | Wind | UV |
|---|---|---|---|---|---|
| Sun, Sep 20 | 🌥️ Fog | 78° / 69° | 0% | 9 mph | 6 |
| Mon, Sep 21 | 🌦️ Light drizzle | 74° / 67° | 6% · 0,0 in | 9 mph | 7 |
| Tue, Sep 22 | ☁️ Overcast | 76° / 65° | 3% | 10 mph | 7 |
| Wed, Sep 23 | ☀️ Clear sky | 76° / 69° | 0% | 10 mph | 7 |
| Thu, Sep 24 | ☀️ Clear sky | 76° / 69° | 2% | 9 mph | 7 |
| Fri, Sep 25 | ☁️ Overcast | 79° / 70° | 0% | 10 mph | 7 |
| Sat, Sep 26 | ☁️ Overcast | 82° / 72° | 1% | 11 mph | 7 |
| Sun, Sep 27 | ☁️ Overcast | 82° / 73° | 5% | 12 mph | 7 |
| Mon, Sep 28 | ☁️ Overcast | 82° / 73° | 10% | 12 mph | 6 |
| Tue, Sep 29 | 🌦️ Light drizzle | 81° / 76° | 11% · 0,1 in | 14 mph | 2 |
| Wed, Sep 30 | 🌦️ Light drizzle | 84° / 73° | 10% · 0,0 in | 11 mph | 1 |
| Thu, Oct 1 | 🌦️ Drizzle | 74° / 71° | 3% · 0,1 in | 16 mph | 7 |
| Fri, Oct 2 | ☀️ Clear sky | 76° / 69° | 3% | 13 mph | 7 |
| Sat, Oct 3 | ☀️ Clear sky | 77° / 69° | 0% | 11 mph | 7 |
| Sun, Oct 4 | ☀️ Clear sky | 85° / 72° | 0% | 10 mph | 7 |
| Mon, Oct 5 | ☀️ Clear sky | 83° / 74° | 3% | 9 mph | 7 |
Climate in San Diego County month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| Month | Avg high | Avg low | Rainfall | Rating |
|---|---|---|---|---|
| January | 65° | 48° | 2,4 in | ★★★★☆ |
| February | 65° | 50° | 3,1 in | ★★★★☆ |
| March | 67° | 52° | 2,7 in | ★★★★☆ |
| April | 67° | 54° | 0,5 in | ★★★★★ |
| May | 69° | 58° | 0,3 in | ★★★★★ |
| June | 72° | 61° | 0,1 in | ★★★★★ |
| July | 76° | 64° | 0,0 in | ★★★★★ |
| August | 78° | 65° | 0,2 in | ★★★★★ |
| September | 76° | 64° | 0,8 in | ★★★★★ |
| October | 75° | 58° | 0,8 in | ★★★★★ |
| November | 69° | 52° | 2,1 in | ★★★★☆ |
| December | 66° | 49° | 1,3 in | ★★★★☆ |
Climate type: Mediterranean. Source: Open-Meteo archive (ERA5).
Weather map for San Diego County
Animated model layers. Pick a layer to load it.
Animated layers by Windy. For pin-level detail and nearby places, see the interactive map below.
Air quality and pollen in San Diego County
Air quality: Open-Meteo (CAMS). US AQI scale.
Sun, twilight and moon
Golden and blue hour are the standard photographic approximation around sunrise and sunset.
Best time to visit San Diego County
Go in April, May, June, July, August, September and October. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: January, February and March - expect the least comfortable mix of heat, cold or rain.
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 70°F (21°C) with partly cloudy. Humidity is 76% and wind is 4 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 7:56 PM.
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 20, 2026 at 7:56 PM local time. Live blocks refresh every 15 minutes; climate averages monthly.
