Peak in September
Coolest in February
Heavy in March
Peak in dry season
Sea Temperature
Coastal Waters(Ocean)
Annual Average
Consider a wetsuit for extended swimming
Based on average sea surface temperature
Ocean
San Diego coastline
San Diego Monthly Weather Guide
Click any month to explore daily weather forecasts
January
February
March
April
May
June
July
August
September
October
November
December
Essential Travel Info for San Diego
Currency
USD
$ United States dollar
Language
English
Driving
Right side
Connect
The most common area code for San Diego ...
Safety
Moderate Safety
GPI: 2.44
Best Time to Visit San Diego
Location, climate overview & historical trends
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📍 32.7157° N, 117.1611° W
Open in Google MapsSan Diego is a prominent destination in United States.
Located at 32.72°N latitude,San Diego experiences a subtropical climate with distinct wet and dry seasons.
Based on 30 years of data, September is the warmest month (avg. 25°C), while February is the coolest. March sees the most rain (16% chance), making July the driest month.
Historical Climate Trend
30-Year Analysis+0.95°C
Total over 30 years
+0.32°C
Per decade
Linear regression analysis of historical maximum temperatures for San Diego, based on 1995-2024 satellite data from NASA POWER.
Best Time to Visit
NASA POWER Data (1991-2021)January, February, March
Best months to visit
21°C
Avg High
Based on 30 years of NASA satellite data,San Diego receives approximately 102mm of rainfall annually. These months offer optimal temperatures and minimal rain probability for your visit.
Climate Trends
EXCLUSIVE1995-2040 Temperature Trend
1995 Avg
20.6°
2024 Avg
20.9°
2040 Proj
21.3°
+0.32°C
per decade (observed)
+0.26°C
per decade (CMIP6)
🌡️ San Diego has warmed by +0.9°C since 1995. By 2040, an additional +0.4°C is projected (based on CMIP6 rate of 0.256°C/decade), for a total of +1.4°C from 1995 baseline.
NASA POWER (1995-2024) + CMIP6 (CMCC_CM2_VHR4, EC_Earth3P_HR, FGOALS_f3_H, HiRAM_SIT_HR, MRI_AGCM3_2_S, NICAM16_8S)
Travel Intelligence
Exclusive flight analytics & health data for San Diego
Smart Flight Estimator
Airport-to-Airport Logistics
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Flight Connectivity Analysis
Airport traffic data & seasonal patterns
Popular destination
0
slots per day
Peak
May
Low
Nov
Monthly Traffic Distribution
Key Connections
Health & Safety Advisory
CDC travel health recommendations
No Special Vaccinations Required
Standard travel precautions apply
Source: CDC Travelers' Health
View Complete Health GuideSan Diego Climate Data by Month
Historical temperature and precipitation averages
| Month | Avg High (°C) | Rain Probability (%) | Status |
|---|---|---|---|
| January | 17°C | 14% | 😊 Pleasant |
| February | 17°C | 16% | 😊 Pleasant |
| March | 18°C | 16% | 😊 Pleasant |
| April | 19°C | 7% | 😊 Pleasant |
| May | 20°C | 3% | ✨ Perfect |
| June | 22°C | 0% | ✨ Perfect |
| July | 24°C | 0% | ✨ Perfect |
| August | 25°C | 1% | ✨ Perfect |
| September | 25°C | 3% | ✨ Perfect |
| October | 23°C | 3% | ✨ Perfect |
| November | 21°C | 8% | ✨ Perfect |
| December | 18°C | 11% | 😊 Pleasant |
Weather in Cities Near San Diego
Explore climate data for popular destinations within easy reach
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Compare weather conditions with nearby destinations for your trip planning
Compare San Diego Weather vs Popular Destinations
Similar Climate Destinations
Discover destinations with weather similar to San Diego
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These destinations share similar weather patterns with San Diego. Perfect alternatives if you're looking for the same climate in a different location.
San Diego Weather FAQ
When is the best time to visit San Diego?
Honestly, look for months with mild temperatures (20°C-25°C) and low rain chance. Based on historical data, January, February, March are usually great choices.
When is the hottest month in San Diego?
September is historically the hottest month in San Diego with average highs of 25°C.
When does it rain the most in San Diego?
March typically sees the highest probability of rain (16%).
Is San Diego expensive?
Prices vary by season. The "Perfect" weather months usually coincide with peak tourist season and higher prices, while the rainy or cold months offer better deals.