How warm is it in San Diego in October?

Daytime highs averaged 26.2 °C, night-time lows 15.3 °C. The highest value of the past 10 years was 35.2 °C (23 Oct 2017), the lowest 10.0 °C (19 Oct 2021).

How often does it rain in San Diego in October?

On average there were 1.0 rain days (at least 1 mm) with 5.6 mm of precipitation in total. In 5 of 10 years there was no rain day at all.

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San Diego weather in October: temperature & rain

Photo: Adbar · CC BY-SA 3.0

🇺🇸 Weather in San Diego in October

This is what the weather in San Diego (California, USA) was like in October over the years 2016–2025.

Key facts at a glance

Prevailing weather: Sunny

Avg. daytime high

26.2 °C

24.0 °C – 27.6 °C

Avg. night-time low

15.3 °C

13.8 °C – 16.9 °C

Avg. rain days in period

1.0

3 % of days · ≥ 1.0 mm

Avg. precipitation in period

5.6 mm

0.3 mm – 17.0 mm

Avg. cloud cover

48 %

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 35.2 °C (23 Oct 2017) · Lowest temperature 10.0 °C (19 Oct 2021) · Avg. daily peak wind 17 km/h

Weather mix of all days

118Sunny
97Partly cloudy
85Cloudy
9Light rain
1Rain

Summary

On average 26.2 °C during the day and 15.3 °C at night.
On average 1.0 rain days (Rain day = at least 1.0 mm of precipitation) with 5.6 mm of precipitation in total.
In 5 of 10 years there was not a single rain day.
Prevailing weather: Sunny.
Warmest year: 2017 (avg. 27.6 °C), coolest: 2021 (avg. 24.0 °C).
Wettest year: 2021 (17.0 mm), driest: 2024 (0.3 mm).
Extremes: 35.2 °C on 23 Oct 2017 and 10.0 °C on 19 Oct 2021.

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

Temperatures per year

Average over your travel period

Precipitation & rain days

Year by year

2025
Avg. max25.1°Avg. min14.5°
Rain days
1 Rain days
Precipitation
13.0 mm
Avg. cloud cover
41 % cloudy
Sea temperature
–
Max 31.5 °C · Min 11.2 °C
2024
Avg. max27.5°Avg. min16.2°
Rain days
0 Rain days
Precipitation
0.3 mm
Avg. cloud cover
59 % cloudy
Sea temperature
–
Max 33.8 °C · Min 10.2 °C
2023
Avg. max26.5°Avg. min15.8°
Rain days
0 Rain days
Precipitation
1.4 mm
Avg. cloud cover
43 % cloudy
Sea temperature
–
Max 33.0 °C · Min 11.5 °C
2022
Avg. max26.3°Avg. min15.4°
Rain days
2 Rain days
Precipitation
8.9 mm
Avg. cloud cover
62 % cloudy
Sea temperature
–
Max 30.7 °C · Min 11.3 °C
2021
Avg. max24.0°Avg. min13.8°
Rain days
4 Rain days
Precipitation
17.0 mm
Avg. cloud cover
44 % cloudy
Sea temperature
–
Max 31.9 °C · Min 10.0 °C
2020
Avg. max27.4°Avg. min16.9°
Rain days
1 Rain days
Precipitation
1.4 mm
Avg. cloud cover
50 % cloudy
Sea temperature
–
Max 34.4 °C · Min 10.1 °C
2019
Avg. max26.3°Avg. min14.2°
Rain days
0 Rain days
Precipitation
0.4 mm
Avg. cloud cover
27 % cloudy
Sea temperature
–
Max 32.0 °C · Min 10.3 °C
2018
Avg. max25.3°Avg. min15.3°
Rain days
2 Rain days
Precipitation
9.0 mm
Avg. cloud cover
56 % cloudy
Sea temperature
–
Max 31.1 °C · Min 12.3 °C
2017
Avg. max27.6°Avg. min15.6°
Rain days
0 Rain days
Precipitation
1.4 mm
Avg. cloud cover
47 % cloudy
Sea temperature
–
Max 35.2 °C · Min 12.0 °C
2016
Avg. max25.9°Avg. min15.2°
Rain days
0 Rain days
Precipitation
3.3 mm
Avg. cloud cover
51 % cloudy
Sea temperature
–
Max 32.6 °C · Min 11.8 °C

Frequently asked questions

How warm is it in San Diego in October?: Daytime highs averaged 26.2 °C, night-time lows 15.3 °C. The highest value of the past 10 years was 35.2 °C (23 Oct 2017), the lowest 10.0 °C (19 Oct 2021).
How often does it rain in San Diego in October?: On average there were 1.0 rain days (at least 1 mm) with 5.6 mm of precipitation in total. In 5 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)