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Atlanta vs San Diego weather: climate comparison
San Diego is the warmer of the two, averaging 63°F (17°C) over the year against 62°F (17°C) in Atlanta. Atlanta is wetter, with 49.0 in (1245 mm) of precipitation a year to San Diego's 11.7 in (298 mm). Below: every month side by side, from 30 years of ERA5 data (1996–2025).
- Mean temperature
- 16.7°C Atlanta
17.0°C San Diego - Annual precipitation
- 1245.1 mm Atlanta
298.4 mm San Diego - Rainy days a year
- 128 Atlanta
38 San Diego - Sunshine per day
- 9.1 h Atlanta
10.9 h San Diego
Month by month
| Month | Atlanta | San Diego |
|---|---|---|
| January | 10.9°C | 17.5°C |
| February | 13.5°C | 17.3°C |
| March | 17.4°C | 17.8°C |
| April | 21.8°C | 19.1°C |
| May | 26.2°C | 20.2°C |
| June | 29.6°C | 21.9°C |
| July | 30.8°C | 24.3°C |
| August | 30.4°C | 25.3°C |
| September | 27.5°C | 25.0°C |
| October | 22.4°C | 23.1°C |
| November | 16.8°C | 20.4°C |
| December | 12.4°C | 17.5°C |
Year at a glance
| Measure | Atlanta | San Diego |
|---|---|---|
| Mean annual temperature | 16.7°C | 17.0°C |
| Warmest month (avg high) | Jul · 31°C | Aug · 25°C |
| Coldest month (avg low) | Jan · 2°C | Jan · 9°C |
| Annual range (warmest high − coldest low) | 29°C | 17°C |
| Annual precipitation | 1245.1 mm | 298.4 mm |
| Rainy days per year | 128 | 38 |
| Wettest / driest month | Jul / Oct | Feb / Jun |
| Average sunshine per day | 9.1 h | 10.9 h |
In short: San Diego is the warmest overall (17.0°C mean); Atlanta gets the most precipitation (1245.1 mm a year); San Diego is the sunniest (10.9 h a day on average); San Diego has the smallest swing between its warmest and coldest months.
Record high 1996–2025: Atlanta 39.9°C (2012-06-30), San Diego 36.6°C (2020-09-30). Record low: Atlanta -13.6°C (2022-12-24), San Diego 1.8°C (2007-01-15).
Source: Open-Meteo Historical Weather API (CC BY 4.0). Values are ERA5 reanalysis model data on a ~9–25 km grid, not readings from a weather station, so a single town’s thermometer can differ by a few degrees and local showers can be missed. Monthly means of daily ERA5 values, 1996–2025, for the grid cells nearest Atlanta (33.78, -84.40) and San Diego (32.72, -117.14).
Which months differ most?
The gap in average highs is widest in June, when Atlanta runs 14°F / 8°C warmer, and narrowest in March (1°F / 0°C apart). The biggest rainfall difference is in July: Atlanta gets 4.9 in (126 mm) more on average.
Add a third or fourth city, or swap in any other place, in the full comparison tool. For one city in depth, see the Atlanta climate and San Diego climate pages.
Compare Atlanta or San Diego with another city
Questions people ask
Is Atlanta warmer than San Diego?
San Diego is warmer on average: its mean annual temperature is 63°F (17°C) against 62°F (17°C) in Atlanta (ERA5, 1996–2025).
Which gets more rain, Atlanta or San Diego?
Atlanta, with about 49.0 in (1245 mm) of precipitation a year and 128 days with at least 1 mm, compared with 11.7 in (298 mm) and 38 days in San Diego.
Which is sunnier, Atlanta or San Diego?
San Diego averages more sunshine: 10.9 h a day against 9.1 h. Sunshine duration is modelled from cloud cover.
How reliable is this comparison?
Both cities use the same 30-year reanalysis, so differences are consistent. Absolute values describe a grid cell several kilometres wide and can differ by a degree or two from the airport station.