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Dallas vs San Diego weather: climate comparison
Dallas is the warmer of the two, averaging 67°F (20°C) over the year against 63°F (17°C) in San Diego. Dallas is wetter, with 43.0 in (1092 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
- 19.7°C Dallas
17.0°C San Diego - Annual precipitation
- 1091.9 mm Dallas
298.4 mm San Diego - Rainy days a year
- 94 Dallas
38 San Diego - Sunshine per day
- 9.4 h Dallas
10.9 h San Diego
Month by month
| Month | Dallas | San Diego |
|---|---|---|
| January | 13.4°C | 17.5°C |
| February | 15.5°C | 17.3°C |
| March | 20.1°C | 17.8°C |
| April | 24.2°C | 19.1°C |
| May | 28.3°C | 20.2°C |
| June | 32.2°C | 21.9°C |
| July | 34.7°C | 24.3°C |
| August | 34.9°C | 25.3°C |
| September | 31.2°C | 25.0°C |
| October | 25.7°C | 23.1°C |
| November | 19.3°C | 20.4°C |
| December | 14.6°C | 17.5°C |
Year at a glance
| Measure | Dallas | San Diego |
|---|---|---|
| Mean annual temperature | 19.7°C | 17.0°C |
| Warmest month (avg high) | Aug · 35°C | Aug · 25°C |
| Coldest month (avg low) | Jan · 4°C | Jan · 9°C |
| Annual range (warmest high − coldest low) | 31°C | 17°C |
| Annual precipitation | 1091.9 mm | 298.4 mm |
| Rainy days per year | 94 | 38 |
| Wettest / driest month | May / Jul | Feb / Jun |
| Average sunshine per day | 9.4 h | 10.9 h |
In short: Dallas is the warmest overall (19.7°C mean); Dallas gets the most precipitation (1091.9 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: Dallas 42.9°C (2023-08-18), San Diego 36.6°C (2020-09-30). Record low: Dallas -18.9°C (2021-02-16), 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 Dallas (32.79, -96.82) and San Diego (32.72, -117.14).
Which months differ most?
The gap in average highs is widest in July, when Dallas runs 19°F / 10°C warmer, and narrowest in November (2°F / 1°C apart). The biggest rainfall difference is in May: Dallas gets 5.2 in (131 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 Dallas climate and San Diego climate pages.
Compare Dallas or San Diego with another city
Questions people ask
Is Dallas warmer than San Diego?
Dallas is warmer on average: its mean annual temperature is 67°F (20°C) against 63°F (17°C) in San Diego (ERA5, 1996–2025).
Which gets more rain, Dallas or San Diego?
Dallas, with about 43.0 in (1092 mm) of precipitation a year and 94 days with at least 1 mm, compared with 11.7 in (298 mm) and 38 days in San Diego.
Which is sunnier, Dallas or San Diego?
San Diego averages more sunshine: 10.9 h a day against 9.4 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.