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Weather in Swansea for December 2025

Your guide to Swansea weather in December - trends and predictions

    Official Weather Alert ⚠️

  • Amber Rain Warning - See hour by hour.

    • Temperatures

  • So far, December 2025 in Swansea is slightly warmer than the historical average by 0.8 °C.

  • Expect cooler weather in the next days in Swansea with the forecast suggesting a temperature of 8.2 °C, lower than the historical average.

  • In general, the average temperature in Swansea at the beginning of December is 10.1 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 8.7 °C by the end of December.

    • Rain 🌧️

  • Swansea experiences heavy rainfall in December, with over 20 rainy days and an average total precipitation 185.5 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
1
Dry days
Average rainy days
30
Rainy days
Average snowy days
0
Snow days
Average temperatures
10°/7°
Temperatures
Average wind speed
37 km/h
Avg max wind
Average humidity
84 %
Avg humidity

Swansea Weather December

Move between months or click on a day
November
January
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Light rain shower
10°
2
Light rain shower
8°
3
Light rain shower
9°
4
Light rain shower
10°
5
Light rain shower
11°
6
Light drizzle
11°
7
Light rain shower
12°
8
Light rain shower
10°
9
Moderate rain
11°
10
Moderate rain
10°
11
Patchy rain possible
9°
12
Patchy rain possible
10°
13
Patchy rain possible
9°
14
Weather Alert Patchy rain possible
11°
15
Weather Alert Heavy rain
10°
16
Patchy rain possible
8°
17
Patchy rain possible
9°
18
Moderate rain
11°
19
Patchy rain possible
9°
20
Sunny
7°
21
Partly cloudy
7°
22
Cloudy
6°
23
Cloudy
7°
24
Partly cloudy
9°
25
Patchy rain possible
10°
26
Sunny
6°
27
Sunny
5°
28
Moderate or heavy rain shower
10°
29
Moderate rain at times
9°
30
Moderate or heavy rain shower
11°
31
Heavy rain at times
10°

Temperatures trend during December in Swansea

See the weather trend as well as the moving average line

December weather in Swansea day by day

Click on a date for more information
November January
Date Weather Temperatures Rain UV More
1 Dec. Light rain shower
Light rain shower
 10° /6° 9 mm 3
2 Dec. Light rain shower
Light rain shower
 8° /5° 4 mm 2
3 Dec. Light rain shower
Light rain shower
 9° /6° 9.4 mm 2
4 Dec. Light rain shower
Light rain shower
 10° /6° 6.9 mm 3
5 Dec. Light rain shower
Light rain shower
 11° /7° 11.2 mm 3
6 Dec. Light drizzle
Light drizzle
 11° /7° 6.6 mm 3
7 Dec. Light rain shower
Light rain shower
 12° /8° 17.9 mm 3
8 Dec. Light rain shower
Light rain shower
 10° /8° 4.2 mm 3
9 Dec. Moderate rain
Moderate rain
 11° /8° 10 mm 3
10 Dec. Moderate rain
Moderate rain
 10° /7° 4.5 mm 3
11 Dec. Patchy rain possible
Patchy rain possible
 9° /6° 0.8 mm 3
12 Dec. Patchy rain possible
Patchy rain possible
 10° /6° 6.7 mm 3
13 Dec. Patchy rain possible
Patchy rain possible
 9° /6° 1.6 mm 2
14 Dec. Patchy rain possible
Patchy rain possible
 11° /9° 2.2 mm 0.1
15 Dec. Heavy rain
Heavy rain
 10° /8° 46.1 mm 0
16 Dec. Patchy rain possible
Patchy rain possible
 8° /5° 0.3 mm 0.1
17 Dec. Patchy rain possible
Patchy rain possible
 9° /5° 2.1 mm 0
18 Dec. Moderate rain
Moderate rain
 11° /8° 6.1 mm 0.1
19 Dec. Patchy rain possible
Patchy rain possible
 9° /6° 0.3 mm 2
20 Dec. Sunny
Sunny
 7° /5° 0 mm 3
21 Dec. Partly cloudy
Partly cloudy
 7° /4° 0 mm 2
22 Dec. Cloudy
Cloudy
 6° /3° 0 mm 1
23 Dec. Cloudy
Cloudy
 7° /3° 0 mm 1
24 Dec. Partly cloudy
Partly cloudy
 9° /6° 0 mm 3
25 Dec. Patchy rain possible
Patchy rain possible
 10° /7° 0.6 mm 2
26 Dec. Sunny
Sunny
 6° /3° 0 mm 2
27 Dec. Sunny
Sunny
 5° /2° 0 mm 2
28 Dec. Moderate or heavy rain shower
Moderate or heavy rain shower
 10° /7° 7.4 mm 3
29 Dec. Moderate rain at times
Moderate rain at times
 9° /7° 4.8 mm 2
30 Dec. Moderate or heavy rain shower
Moderate or heavy rain shower
 11° /7° 8.5 mm 3
31 Dec. Heavy rain at times
Heavy rain at times
 10° /7° 13.3 mm 3
Next
Important Notice
Our weather forecast for Swansea in December is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Swansea forecast closer to your planned date for the most up-to-date weather information.
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Swansea in December - FAQ

What are the expected maximum and minimum temperatures in Swansea during December?
During December, expect a variety of temperatures with highs around 10° and lows near 7°, suitable for diverse activities and preferences.
How much rainfall should be expected in Swansea during December?
Significant rainfall exceeding 185.5 mm is expected in Swansea during December, occurring over more than 30 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Swansea during December?
The average wind speed in Swansea during December is 37 km/h, suggesting breezy to windy conditions, depending on your activities.

December rainfall patterns in Swansea

Explore the daily rainfall trends and prepare for Swanseas December weather 💧
Typically, Swansea has 30 rainy days in December with a total of 185.5 mm of rainfall.

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Location coordinates Where is Swansea?

Get accurate weather forecasts for Swansea, located at latitude 51.621 and longitude -3.943. Stay updated with localized weather information tailored for Swansea.

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