Weather in San Diego County, California for May 2026
Beach Hazards Statement - See hour by hour.
Until now, May 2026 in San Diego County has been nearly identical to the historical average, with a temperature of 19.4 °F (showing only a slight deviation of 0.3 °F).
The forecast for the upcoming days in San Diego County predicts a temperature of 20.8 °F, which is slightly above the historical average.
In general, the average temperature in San Diego County at the beginning of May is 18 °F. As the month progressed, temperatures tended to noticeably warm up, reaching an average of 21 °F by the end of May.
With an average of 3 rainy days, San Diego County experiences minimal rainfall in May.
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San Diego County Weather May
Temperatures trend during May in San Diego County
May weather in San Diego County day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 |  Patchy rain possible | 18° /13° | 0.2 mm | 6 | |
| May 2 |  Overcast | 19° /13° | 0.2 mm | 6 | |
| May 3 | Overcast | 18° /14° | 0.2 mm | 5 | |
| May 4 |  Moderate or heavy rain shower | 17° /13° | 4.3 mm | 5 | |
| May 5 | Patchy rain possible | 17° /13° | 1.4 mm | 5 | |
| May 6 |  Cloudy | 18° /12° | 0 mm | 6 | |
| May 7 |  Sunny | 19° /13° | 0 mm | 6 | |
| May 8 |  Partly cloudy | 20° /14° | 0 mm | 6 | |
| May 9 | Patchy rain possible | 20° /14° | 0.2 mm | 6 | |
| May 10 | Sunny | 21° /14° | 0.2 mm | 7 | |
| May 11 | Cloudy | 21° /14° | 0 mm | 7 | |
| May 12 | Sunny | 20° /15° | 0.2 mm | 7 | |
| May 13 | Overcast | 19° /14° | 0 mm | 7 | |
| May 14 | Partly cloudy | 20° /14° | 0 mm | 7 | |
| May 15 | Patchy rain possible | 19° /14° | 0.1 mm | 6 | |
| May 16 | Patchy rain possible | 19° /14° | 0.1 mm | 5 | |
| May 17 | Patchy rain possible | 20° /16° | 0.9 mm | 8.5 | |
| May 18 | Patchy rain possible | 20° /16° | 0.4 mm | 9.7 | |
| May 19 | Sunny | 21° /17° | 0 mm | 8 | |
| May 20 | Sunny | 22° /18° | 0 mm | 8.8 | |
| May 21 | Sunny | 22° /17° | 0 mm | 0 | |
| May 22 | Partly cloudy | 21° /18° | 0 mm | 5 | |
| May 23 | Partly cloudy | 21° /18° | 0 mm | 5 | |
| May 24 | Patchy rain possible | 20° /17° | 0.1 mm | 4 | |
| May 25 | Patchy rain possible | 19° /17° | 0.3 mm | 4 | |
| May 26 | Partly cloudy | 20° /17° | 0 mm | 5 | |
| May 27 | Sunny | 19° /16° | 0 mm | 5 | |
| May 28 | Sunny | 21° /17° | 0 mm | 5 | |
| May 29 | Sunny | 23° /18° | 0 mm | 6 | |
| May 30 | Sunny | 22° /18° | 0 mm | 5 | |
| May 31 | Patchy rain possible | 23° /15° | 0.2 mm | 5 | |
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San Diego County in May - FAQ
What are the expected maximum and minimum temperatures in San Diego County during May?
How much rainfall should be expected in San Diego County during May?
What are the typical wind conditions in San Diego County during May?
May rainfall patterns in San Diego County
UV exposure in San Diego County during May
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Where is San Diego County?Get accurate weather forecasts for San Diego County, located at latitude 32.716 and longitude -117.165. Stay updated with localized weather information tailored for San Diego County.