How warm is it in San Diego in May?

Daytime highs averaged 22.3 °C, night-time lows 11.9 °C. The highest value of the past 10 years was 32.5 °C (30 May 2025), the lowest 7.4 °C (11 May 2022).

How often does it rain in San Diego in May?

On average there were 1.5 rain days (at least 1 mm) with 7.3 mm of precipitation in total. In 4 of 10 years there was no rain day at all.

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San Diego weather in May: temperature & rain

Photo: Adbar · CC BY-SA 3.0

🇺🇸 Weather in San Diego in May

This is what the weather in San Diego (California, USA) was like in May over the years 2017–2026.

Key facts at a glance

Prevailing weather: Cloudy

Avg. daytime high

22.3 °C

19.7 °C – 24.5 °C

Avg. night-time low

11.9 °C

10.9 °C – 13.5 °C

Avg. rain days in period

1.5

5 % of days · ≥ 1.0 mm

Avg. precipitation in period

7.3 mm

0.2 mm – 29.9 mm

Avg. cloud cover

73 %

This data source has no sunshine hours – average cloud cover is shown instead.

Avg. sea temperature

–

Sea temperature unavailable for today (daily limit).

Extremes: Highest temperature 32.5 °C (30 May 2025) · Lowest temperature 7.4 °C (11 May 2022) · Avg. daily peak wind 20 km/h

Weather mix of all days

29Sunny
75Partly cloudy
191Cloudy
14Light rain
1Rain

Summary

On average 22.3 °C during the day and 11.9 °C at night.
On average 1.5 rain days (Rain day = at least 1.0 mm of precipitation) with 7.3 mm of precipitation in total.
In 4 of 10 years there was not a single rain day.
Prevailing weather: Cloudy.
Warmest year: 2020 (avg. 24.5 °C), coolest: 2019 (avg. 19.7 °C).
Wettest year: 2019 (29.9 mm), driest: 2022 (0.2 mm).
Extremes: 32.5 °C on 30 May 2025 and 7.4 °C on 11 May 2022.

Overall values from all 10 years. How is this calculated?

Temperatures per year

Average over your travel period

Precipitation & rain days

Year by year

2026
Avg. max23.0°Avg. min12.7°
Rain days
1 Rain days
Precipitation
5.3 mm
Avg. cloud cover
73 % cloudy
Sea temperature
–
Max 31.2 °C · Min 11.4 °C
2025
Avg. max23.3°Avg. min12.5°
Rain days
1 Rain days
Precipitation
6.5 mm
Avg. cloud cover
77 % cloudy
Sea temperature
–
Max 32.5 °C · Min 9.9 °C
2024
Avg. max21.0°Avg. min10.9°
Rain days
1 Rain days
Precipitation
2.4 mm
Avg. cloud cover
84 % cloudy
Sea temperature
–
Max 25.2 °C · Min 9.7 °C
2023
Avg. max20.3°Avg. min11.3°
Rain days
1 Rain days
Precipitation
6.0 mm
Avg. cloud cover
80 % cloudy
Sea temperature
–
Max 26.4 °C · Min 8.7 °C
2022
Avg. max23.3°Avg. min11.3°
Rain days
0 Rain days
Precipitation
0.2 mm
Avg. cloud cover
69 % cloudy
Sea temperature
–
Max 30.8 °C · Min 7.4 °C
2021
Avg. max23.0°Avg. min11.1°
Rain days
0 Rain days
Precipitation
1.2 mm
Avg. cloud cover
77 % cloudy
Sea temperature
–
Max 30.4 °C · Min 9.0 °C
2020
Avg. max24.5°Avg. min13.5°
Rain days
0 Rain days
Precipitation
1.6 mm
Avg. cloud cover
52 % cloudy
Sea temperature
–
Max 30.4 °C · Min 11.5 °C
2019
Avg. max19.7°Avg. min11.5°
Rain days
9 Rain days
Precipitation
29.9 mm
Avg. cloud cover
74 % cloudy
Sea temperature
–
Max 24.9 °C · Min 9.5 °C
2018
Avg. max22.0°Avg. min11.9°
Rain days
0 Rain days
Precipitation
2.3 mm
Avg. cloud cover
75 % cloudy
Sea temperature
–
Max 31.0 °C · Min 9.3 °C
2017
Avg. max22.6°Avg. min12.1°
Rain days
2 Rain days
Precipitation
17.6 mm
Avg. cloud cover
72 % cloudy
Sea temperature
–
Max 30.6 °C · Min 8.4 °C

Frequently asked questions

How warm is it in San Diego in May?: Daytime highs averaged 22.3 °C, night-time lows 11.9 °C. The highest value of the past 10 years was 32.5 °C (30 May 2025), the lowest 7.4 °C (11 May 2022).
How often does it rain in San Diego in May?: On average there were 1.5 rain days (at least 1 mm) with 7.3 mm of precipitation in total. In 4 of 10 years there was no rain day at all.

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Data sources

Weather data: Data obtained from the NASA Langley Research Center (LaRC) POWER Project funded through the NASA Earth Science/Applied Science Program
Reanalysis (weather model constrained by observations) on a coarse grid of about 50 km. Values represent a large area and can differ from local conditions, especially on islands, coasts and in mountains. Snow depth is the model value for the grid cell, not the depth on the slopes. No sunshine duration.
Reanalysis (weather model constrained by observations)
Reanalysis values represent a grid cell (approx. 25–50 km) and may differ from local measurements on coasts, islands and in mountains.
Sea temperature: MUR SST data were provided by JPL under support by NASA MEaSUREs program; accessed via NOAA CoastWatch ERDDAP
Daily multi-scale ultra-high resolution (≈ 1 km) analysis of satellite measurements (infrared, microwave) and in-situ data. Represents the foundation temperature below the daily warm surface layer. (Satellite and in-situ analysis)
Place search: Natural Earth (public domain) · GeoNames (CC BY 4.0) / OpenStreetMap (ODbL)