San Diego County Climate and Average Weather
Climate of San Diego County: average temperatures, rainfall and seasons month by month.
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° | 0,6 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).
Recent extremes in San Diego County
Highest and lowest readings observed in the last 3 years of reanalysis data - not all-time records.
How San Diego County compares with nearby places
Annual averages, and the difference against San Diego County.
| Place | Distance | Avg temp | vs here | Annual rain |
|---|---|---|---|---|
| San Diego | 0 mi | 63°F | about the same | 15 in |
| San Diego International Airport | 2 mi | 63°F | about the same | 15 in |
| Coronado Beach | 3 mi | 63°F | about the same | 15 in |
| Anza-Borrego Desert State Park | 58 mi | 74°F | +43°F warmer | 5 in |
| Orange County | 79 mi | 64°F | +33°F warmer | 16 in |
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.
What this means for San Diego County
Today is slightly warmer than average for August. The forecast high of 84°F is 6.1°F above the 78°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.
What to pack, what to skip
- Lightweight, light-coloured clothing and a refillable water bottle
- Sunglasses, a brimmed hat and SPF 30+
- If your dates are flexible, avoid January, February and March - historically the least comfortable months here.
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 76°F (25°C) in San Diego County with clear. It feels like 82°F. Today runs from 69°F to 84°F. Chance of precipitation is 0%. Sightseeing conditions score 9.8/10 - excellent - go now.
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 slightly warmer than average for August. The forecast high of 84°F is 6.1°F above the 78°F typical for this month. The best window to be outside is roughly 7 AM to 10 AM, when temperature, rain chance and wind line up best. sightseeing is the strongest bet in San Diego County today at 9.8/10. No weather-related travel disruption is expected today. Roads and airports should run normally.
Compiled from this page's own data: atlas facts plus live Open-Meteo readings.
Quick facts about San Diego County
| Type | County |
|---|---|
| State | California |
| Country | United States |
| Continent | North America |
| Coordinates | 32°42′56.5″N 117°9′40″W (32.7157, -117.1611) |
| Population | 3.280.000 |
| Local time | 6:53 AM (UTC-07:00) |
| Best months | April, May, June, July, August, September and October |
| Climate | Mediterranean |
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.
Explore San Diego County
Every topic we hold for this place, and the same topic for the places around it.
Climate 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 76°F (25°C) with clear. Humidity is 74% 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 6:53 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 August 23, 2026 at 6:53 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
