San Diego County
May
Weather in San Diego County for May 2025
Your guide to San Diego County weather in May - trends and predictions
In general, the average temperature in San Diego County at the beginning of May is 18 °F. As the month progressed, temperatures tended to moderately rise, reaching an average of 19.1 °F by the end of May.
San Diego County sees moderate rainfall in May, averaging 7 rainy days.
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24
Dry days
7
Rainy days
0
Snow days
20°/14°
Temperatures
18 km/h
Avg max wind
69 %
Avg humidity
San Diego County in May average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  18° | 2 18° | 3 19° | 4  17° | |||
| 5 16° | 6  19° | 7 19° | 8  19° | 9 19° | 10 19° | 11 19° |
| 12  20° | 13 20° | 14 20° | 15 19° | 16 20° | 17 20° | 18 20° |
| 19 19° | 20 19° | 21 20° | 22 19° | 23 18° | 24 18° | 25 18° |
| 26 18° | 27 20° | 28 20° | 29 20° | 30 19° | 31 19° |
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Temperatures trend during May in San Diego County
See the weather trend as well as the moving average line
May weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 | Patchy rain possible | 18° /13° | 0.3 mm | 5 | |
| May 2 | Patchy rain possible | 18° /13° | 0.4 mm | 5 | |
| May 3 | Patchy rain possible | 19° /13° | 0.4 mm | 5 | |
| May 4 | Moderate or heavy rain shower | 17° /13° | 8.5 mm | 4 | |
| May 5 | Patchy rain possible | 16° /13° | 1.4 mm | 4 | |
| May 6 | Cloudy | 19° /12° | 0 mm | 5 | |
| May 7 | Cloudy | 19° /13° | 0 mm | 5 | |
| May 8 | Partly cloudy | 19° /13° | 0 mm | 5 | |
| May 9 | Patchy rain possible | 19° /14° | 0.3 mm | 5 | |
| May 10 | Patchy rain possible | 19° /14° | 0.4 mm | 5 | |
| May 11 | Cloudy | 19° /14° | 0 mm | 5 | |
| May 12 | Sunny | 20° /15° | 0.1 mm | 6 | |
| May 13 | Sunny | 20° /14° | 0 mm | 6 | |
| May 14 | Sunny | 20° /14° | 0 mm | 6 | |
| May 15 | Sunny | 19° /14° | 0.1 mm | 5 | |
| May 16 | Sunny | 20° /15° | 0.1 mm | 5 | |
| May 17 | Sunny | 20° /14° | 0.1 mm | 5 | |
| May 18 | Sunny | 20° /15° | 0 mm | 6 | |
| May 19 | Partly cloudy | 19° /14° | 0 mm | 6 | |
| May 20 | Cloudy | 19° /14° | 0 mm | 5 | |
| May 21 | Sunny | 20° /14° | 0 mm | 6 | |
| May 22 | Cloudy | 19° /14° | 0.1 mm | 5 | |
| May 23 | Partly cloudy | 18° /15° | 0.3 mm | 5 | |
| May 24 | Cloudy | 18° /15° | 0.3 mm | 4 | |
| May 25 | Partly cloudy | 18° /14° | 0.6 mm | 5 | |
| May 26 | Patchy rain possible | 18° /14° | 0.4 mm | 4 | |
| May 27 | Cloudy | 20° /15° | 0.1 mm | 5 | |
| May 28 | Patchy rain possible | 20° /14° | 0.5 mm | 5 | |
| May 29 | Patchy rain possible | 20° /14° | 0.3 mm | 5 | |
| May 30 | Patchy rain possible | 19° /15° | 1.5 mm | 4 | |
| May 31 | Patchy rain possible | 19° /15° | 0.3 mm | 5 | |
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Important Notice
Our weather forecast for San Diego County in May is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the San Diego County forecast closer to your planned date for the most up-to-date weather information.
San Diego County in May - FAQ
What are the expected maximum and minimum temperatures in San Diego County during May?
Enjoy moderate daytime temperatures of up to 20° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in San Diego County during May?
In May, San Diego County can expect light to moderate rainfall, totaling 31.7 mm across approximately 7 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in San Diego County during May?
The average wind speed in San Diego County during May is 18 km/h, suggesting breezy to windy conditions, depending on your activities.
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