Climate averages 1991–2020

Swansea weather
in April.

A cool, moderately wet month: the 7th warmest and the driest of the year.

Long-term climate patterns, not a forecast for a particular trip.

Average high 11.8°C Daytime mean, April

Average low 6.1°C Night-time mean, April

Rainfall 69 mm 12 days with ≥1 mm

Daylight 14 h Sunrise to sunset, per day

April is a cool month in Swansea: daytime highs average 11.8°C and nights cool to about 6.1°C. By daytime temperature it is the 7th warmest of the 12 months.

Expect about 69 mm of rain on roughly 12 days, which makes April a moderately wet month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 13 h 50 min on an average April day.

The nearest other city in this atlas is Cardiff (55 km away). In April its highs average 12.2°C, about as warm as Swansea, with 70 mm of rain.

Among the 143 cities listed in the United Kingdom, Swansea ranks joint 104th of 143 for the warmest April highs and 131st of 143 for the driest April (rainfall, lowest first). The mean April high of those 143 cities is 12.2°C; Swansea is 0.4°C cooler than that mean.

From April to May, average highs rise by 2.8°C to 14.6°C, and monthly rainfall rises from 69 mm to 72 mm.

The annual picture

April in context

30-year average

Average highAverage low°C

Monthly rainfall

Average total · mm

Averages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated

Every month, side by side

Swansea climate table

1991–2020

Monthly climate averages for Swansea, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	7.7°C4.0°C	4.0°C	128	17.0	8.48 h
February	7.8°C3.7°C	3.7°C	92	13.1	9.910 h
March	9.4°C4.5°C	4.5°C	83	13.7	11.812 h
April, selected	11.8°C6.1°C	6.1°C	69	12.0	13.814 h
May	14.6°C8.8°C	8.8°C	72	12.4	15.616 h
June	16.9°C11.6°C	11.6°C	79	12.2	16.617 h
July	18.5°C13.5°C	13.5°C	86	13.8	16.216 h
August	18.5°C13.8°C	13.8°C	101	14.3	14.615 h
September	16.8°C12.1°C	12.1°C	96	13.2	12.713 h
October	13.7°C9.7°C	9.7°C	143	16.7	10.711 h
November	10.5°C6.9°C	6.9°C	143	17.3	8.99 h
December	8.2°C4.7°C	4.7°C	145	16.8	7.98 h

Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.

Compare places

April in nearby cities

Distance from Swansea

Read the numbers correctly

Climate, not a promise.

These patterns help compare months. They cannot tell you the weather on a specific day of your trip.

Sources, method and limits

How these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Swansea) is explained once on the Swansea year overview and on the Sources, method and limits page.