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Las Vegas vs San Diego weather: climate comparison
Las Vegas is the warmer of the two, averaging 68°F (20°C) over the year against 63°F (17°C) in San Diego. San Diego is wetter, with 11.7 in (298 mm) of precipitation a year to Las Vegas's 5.2 in (131 mm). Below: every month side by side, from 30 years of ERA5 data (1996–2025).
- Mean temperature
- 20.2°C Las Vegas
17.0°C San Diego - Annual precipitation
- 130.9 mm Las Vegas
298.4 mm San Diego - Rainy days a year
- 25 Las Vegas
38 San Diego - Sunshine per day
- 11.3 h Las Vegas
10.9 h San Diego
Month by month
| Month | Las Vegas | San Diego |
|---|---|---|
| January | 14.1°C | 17.5°C |
| February | 16.3°C | 17.3°C |
| March | 20.9°C | 17.8°C |
| April | 25.4°C | 19.1°C |
| May | 30.8°C | 20.2°C |
| June | 36.8°C | 21.9°C |
| July | 39.5°C | 24.3°C |
| August | 38.2°C | 25.3°C |
| September | 33.9°C | 25.0°C |
| October | 26.5°C | 23.1°C |
| November | 18.9°C | 20.4°C |
| December | 13.3°C | 17.5°C |
Year at a glance
| Measure | Las Vegas | San Diego |
|---|---|---|
| Mean annual temperature | 20.2°C | 17.0°C |
| Warmest month (avg high) | Jul · 39°C | Aug · 25°C |
| Coldest month (avg low) | Dec · 4°C | Jan · 9°C |
| Annual range (warmest high − coldest low) | 36°C | 17°C |
| Annual precipitation | 130.9 mm | 298.4 mm |
| Rainy days per year | 25 | 38 |
| Wettest / driest month | Feb / Jun | Feb / Jun |
| Average sunshine per day | 11.3 h | 10.9 h |
In short: Las Vegas is the warmest overall (20.2°C mean); San Diego gets the most precipitation (298.4 mm a year); Las Vegas is the sunniest (11.3 h a day on average); San Diego has the smallest swing between its warmest and coldest months.
Record high 1996–2025: Las Vegas 47.4°C (2024-07-07), San Diego 36.6°C (2020-09-30). Record low: Las Vegas -6.9°C (2008-12-19), 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 Las Vegas (36.17, -115.13) and San Diego (32.72, -117.14).
Which months differ most?
The gap in average highs is widest in July, when Las Vegas runs 27°F / 15°C warmer, and narrowest in February (2°F / 1°C apart). The biggest rainfall difference is in February: San Diego gets 1.6 in (40 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 Las Vegas climate and San Diego climate pages.
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Questions people ask
Is Las Vegas warmer than San Diego?
Las Vegas is warmer on average: its mean annual temperature is 68°F (20°C) against 63°F (17°C) in San Diego (ERA5, 1996–2025).
Which gets more rain, Las Vegas or San Diego?
San Diego, with about 11.7 in (298 mm) of precipitation a year and 38 days with at least 1 mm, compared with 5.2 in (131 mm) and 25 days in Las Vegas.
Which is sunnier, Las Vegas or San Diego?
Las Vegas averages more sunshine: 11.3 h a day against 10.9 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.