How warm is it in London in December?

Daytime highs averaged 8.3 °C, night-time lows 3.6 °C. The highest value of the past 10 years was 13.9 °C (31 Dec 2021), the lowest -4.7 °C (15 Dec 2022).

How often does it rain in London in December?

On average there were 13.8 rain days (at least 1 mm) with 77.2 mm of precipitation in total.

🇬🇧 Weather in London in December

This is what the weather in London (United Kingdom) was like in December in 2016–2025.

Key facts at a glance

Prevailing weather: Cloudy

Avg. daytime high

8.3 °C

6.8 °C – 9.3 °C

Avg. night-time low

3.6 °C

1.8 °C – 4.8 °C

Avg. rain days in period

13.8

45 % of days · ≥ 1.0 mm

Avg. precipitation in period

77.2 mm

20.3 mm – 114 mm

Avg. cloud cover

76 %

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

Avg. sea temperature

–

No sea nearby – no sea temperature.

Extremes: Highest temperature 13.9 °C (31 Dec 2021) · Lowest temperature -4.7 °C (15 Dec 2022) · Avg. daily peak wind 28 km/h

Weather mix of all days

15Sunny
51Partly cloudy
106Cloudy
81Light rain
57Rain

Summary

On average 8.3 °C during the day and 3.6 °C at night.
On average 13.8 rain days (Rain day = at least 1.0 mm of precipitation) with 77.2 mm of precipitation in total.
Prevailing: Cloudy.
Warmest year: 2025 (avg. 9.3 °C), coolest: 2022 (avg. 6.8 °C).
Wettest year: 2020 (114 mm), driest: 2016 (20.3 mm).
Extremes: 13.9 °C on 31 Dec 2021 and -4.7 °C on 15 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. max9.3°Avg. min4.6°
Rain days
12 Rain days
Precipitation
72.3 mm
Avg. cloud cover
73 % cloudy
Sea temperature
–
Max 13.4 °C · Min -1.1 °C
2024
Avg. max8.7°Avg. min4.4°
Rain days
11 Rain days
Precipitation
45.9 mm
Avg. cloud cover
77 % cloudy
Sea temperature
–
Max 13.7 °C · Min 0.8 °C
2023
Avg. max9.2°Avg. min4.8°
Rain days
16 Rain days
Precipitation
93.4 mm
Avg. cloud cover
83 % cloudy
Sea temperature
–
Max 13.2 °C · Min -2.8 °C
2022
Avg. max6.8°Avg. min1.9°
Rain days
13 Rain days
Precipitation
68.0 mm
Avg. cloud cover
69 % cloudy
Sea temperature
–
Max 12.6 °C · Min -4.7 °C
2021
Avg. max8.9°Avg. min4.1°
Rain days
16 Rain days
Precipitation
74.8 mm
Avg. cloud cover
82 % cloudy
Sea temperature
–
Max 13.9 °C · Min -2.5 °C
2020
Avg. max7.3°Avg. min2.9°
Rain days
19 Rain days
Precipitation
114 mm
Avg. cloud cover
78 % cloudy
Sea temperature
–
Max 12.9 °C · Min -2.2 °C
2019
Avg. max8.6°Avg. min3.5°
Rain days
17 Rain days
Precipitation
104 mm
Avg. cloud cover
71 % cloudy
Sea temperature
–
Max 12.4 °C · Min -1.7 °C
2018
Avg. max9.0°Avg. min4.0°
Rain days
16 Rain days
Precipitation
80.8 mm
Avg. cloud cover
78 % cloudy
Sea temperature
–
Max 13.1 °C · Min -2.8 °C
2017
Avg. max7.0°Avg. min1.8°
Rain days
14 Rain days
Precipitation
98.4 mm
Avg. cloud cover
74 % cloudy
Sea temperature
–
Max 11.8 °C · Min -4.2 °C
2016
Avg. max8.6°Avg. min3.5°
Rain days
4 Rain days
Precipitation
20.3 mm
Avg. cloud cover
74 % cloudy
Sea temperature
–
Max 12.6 °C · Min -1.2 °C

Frequently asked questions

How warm is it in London in December?: Daytime highs averaged 8.3 °C, night-time lows 3.6 °C. The highest value of the past 10 years was 13.9 °C (31 Dec 2021), the lowest -4.7 °C (15 Dec 2022).
How often does it rain in London in December?: On average there were 13.8 rain days (at least 1 mm) with 77.2 mm of precipitation in total.

Check your exact travel dates

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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. 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)