How warm is it in San Francisco in December?

Daytime highs averaged 14.0 °C, night-time lows 7.0 °C. The highest value of the past 10 years was 20.2 °C (8 Dec 2020), the lowest 0.9 °C (18 Dec 2022).

How often does it rain in San Francisco in December?

On average there were 10.0 rain days (at least 1 mm) with 113 mm of precipitation in total. In 1 of 10 years there was no rain day at all.

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San Francisco weather in December: temperature & rain

Photo: King of Hearts · CC BY-SA 3.0

🇺🇸 Weather in San Francisco in December

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

Key facts at a glance

Prevailing weather: Partly cloudy

Avg. daytime high

14.0 °C

12.4 °C – 15.5 °C

Avg. night-time low

7.0 °C

5.8 °C – 8.4 °C

Avg. rain days in period

10.0

32 % of days · ≥ 1.0 mm

Avg. precipitation in period

113 mm

2.9 mm – 233 mm

Avg. cloud cover

58 %

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 20.2 °C (8 Dec 2020) · Lowest temperature 0.9 °C (18 Dec 2022) · Avg. daily peak wind 17 km/h

Weather mix of all days

71Sunny
91Partly cloudy
48Cloudy
37Light rain
63Rain

Summary

On average 14.0 °C during the day and 7.0 °C at night.
On average 10.0 rain days (Rain day = at least 1.0 mm of precipitation) with 113 mm of precipitation in total.
In 1 of 10 years there was not a single rain day.
Prevailing weather: Partly cloudy.
Warmest year: 2023 (avg. 15.5 °C), coolest: 2021 (avg. 12.4 °C).
Wettest year: 2022 (233 mm), driest: 2017 (2.9 mm).
Extremes: 20.2 °C on 8 Dec 2020 and 0.9 °C on 18 Dec 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

2025
Avg. max14.0°Avg. min7.6°
Rain days
10 Rain days
Precipitation
108 mm
Avg. cloud cover
54 % cloudy
Sea temperature
–
Max 16.9 °C · Min 4.7 °C
2024
Avg. max14.8°Avg. min7.8°
Rain days
13 Rain days
Precipitation
133 mm
Avg. cloud cover
60 % cloudy
Sea temperature
–
Max 18.8 °C · Min 3.7 °C
2023
Avg. max15.5°Avg. min8.4°
Rain days
11 Rain days
Precipitation
112 mm
Avg. cloud cover
66 % cloudy
Sea temperature
–
Max 18.6 °C · Min 4.6 °C
2022
Avg. max12.6°Avg. min5.8°
Rain days
14 Rain days
Precipitation
233 mm
Avg. cloud cover
59 % cloudy
Sea temperature
–
Max 15.2 °C · Min 0.9 °C
2021
Avg. max12.4°Avg. min6.4°
Rain days
14 Rain days
Precipitation
191 mm
Avg. cloud cover
67 % cloudy
Sea temperature
–
Max 19.3 °C · Min 3.0 °C
2020
Avg. max15.1°Avg. min6.5°
Rain days
6 Rain days
Precipitation
42.4 mm
Avg. cloud cover
43 % cloudy
Sea temperature
–
Max 20.2 °C · Min 2.9 °C
2019
Avg. max13.7°Avg. min8.2°
Rain days
18 Rain days
Precipitation
136 mm
Avg. cloud cover
70 % cloudy
Sea temperature
–
Max 16.5 °C · Min 4.1 °C
2018
Avg. max14.2°Avg. min7.2°
Rain days
6 Rain days
Precipitation
63.1 mm
Avg. cloud cover
55 % cloudy
Sea temperature
–
Max 16.4 °C · Min 4.1 °C
2017
Avg. max15.1°Avg. min6.2°
Rain days
0 Rain days
Precipitation
2.9 mm
Avg. cloud cover
49 % cloudy
Sea temperature
–
Max 17.3 °C · Min 4.0 °C
2016
Avg. max12.6°Avg. min5.8°
Rain days
8 Rain days
Precipitation
108 mm
Avg. cloud cover
53 % cloudy
Sea temperature
–
Max 16.6 °C · Min 1.1 °C

Frequently asked questions

How warm is it in San Francisco in December?: Daytime highs averaged 14.0 °C, night-time lows 7.0 °C. The highest value of the past 10 years was 20.2 °C (8 Dec 2020), the lowest 0.9 °C (18 Dec 2022).
How often does it rain in San Francisco in December?: On average there were 10.0 rain days (at least 1 mm) with 113 mm of precipitation in total. In 1 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)