How warm is it in San Diego in March?

Daytime highs averaged 19.2 °C, night-time lows 9.8 °C. The highest value of the past 10 years was 32.2 °C (17 Mar 2026), the lowest 3.3 °C (2 Mar 2023).

How often does it rain in San Diego in March?

On average there were 8.6 rain days (at least 1 mm) with 55.1 mm of precipitation in total.

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San Diego weather in March: temperature & rain

Photo: Adbar · CC BY-SA 3.0

🇺🇸 Weather in San Diego in March

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

Key facts at a glance

Prevailing weather: Partly cloudy

Avg. daytime high

19.2 °C

15.6 °C – 26.0 °C

Avg. night-time low

9.8 °C

7.5 °C – 13.9 °C

Avg. rain days in period

8.6

28 % of days · ≥ 1.0 mm

Avg. precipitation in period

55.1 mm

5.1 mm – 120 mm

Avg. cloud cover

55 %

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 32.2 °C (17 Mar 2026) · Lowest temperature 3.3 °C (2 Mar 2023) · Avg. daily peak wind 20 km/h

Weather mix of all days

71Sunny
85Partly cloudy
68Cloudy
52Light rain
32Rain
2Snow

Summary

On average 19.2 °C during the day and 9.8 °C at night.
On average 8.6 rain days (Rain day = at least 1.0 mm of precipitation) with 55.1 mm of precipitation in total.
Prevailing weather: Partly cloudy.
Warmest year: 2026 (avg. 26.0 °C), coolest: 2023 (avg. 15.6 °C).
Wettest year: 2023 (120 mm), driest: 2017 (5.1 mm).
Extremes: 32.2 °C on 17 Mar 2026 and 3.3 °C on 2 Mar 2023.

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. max26.0°Avg. min13.9°
Rain days
7 Rain days
Precipitation
15.6 mm
Avg. cloud cover
51 % cloudy
Sea temperature
–
Max 32.2 °C · Min 9.6 °C
2025
Avg. max18.2°Avg. min9.2°
Rain days
10 Rain days
Precipitation
76.8 mm
Avg. cloud cover
57 % cloudy
Sea temperature
–
Max 29.6 °C · Min 5.8 °C
2024
Avg. max17.2°Avg. min9.7°
Rain days
10 Rain days
Precipitation
72.2 mm
Avg. cloud cover
53 % cloudy
Sea temperature
–
Max 21.6 °C · Min 7.2 °C
2023
Avg. max15.6°Avg. min7.5°
Rain days
12 Rain days
Precipitation
120 mm
Avg. cloud cover
60 % cloudy
Sea temperature
–
Max 21.2 °C · Min 3.3 °C
2022
Avg. max21.0°Avg. min10.4°
Rain days
6 Rain days
Precipitation
43.0 mm
Avg. cloud cover
46 % cloudy
Sea temperature
–
Max 27.5 °C · Min 6.2 °C
2021
Avg. max18.1°Avg. min7.9°
Rain days
8 Rain days
Precipitation
45.5 mm
Avg. cloud cover
41 % cloudy
Sea temperature
–
Max 27.5 °C · Min 4.3 °C
2020
Avg. max17.1°Avg. min9.4°
Rain days
16 Rain days
Precipitation
102 mm
Avg. cloud cover
66 % cloudy
Sea temperature
–
Max 24.4 °C · Min 6.7 °C
2019
Avg. max17.8°Avg. min9.4°
Rain days
9 Rain days
Precipitation
35.5 mm
Avg. cloud cover
57 % cloudy
Sea temperature
–
Max 25.0 °C · Min 5.8 °C
2018
Avg. max19.4°Avg. min9.8°
Rain days
7 Rain days
Precipitation
35.7 mm
Avg. cloud cover
68 % cloudy
Sea temperature
–
Max 27.2 °C · Min 5.8 °C
2017
Avg. max21.4°Avg. min10.9°
Rain days
1 Rain days
Precipitation
5.1 mm
Avg. cloud cover
51 % cloudy
Sea temperature
–
Max 28.5 °C · Min 5.6 °C

Frequently asked questions

How warm is it in San Diego in March?: Daytime highs averaged 19.2 °C, night-time lows 9.8 °C. The highest value of the past 10 years was 32.2 °C (17 Mar 2026), the lowest 3.3 °C (2 Mar 2023).
How often does it rain in San Diego in March?: On average there were 8.6 rain days (at least 1 mm) with 55.1 mm of precipitation in total.

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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)