Climate averages 1991–2020

Swindon weather
in May.

A mild, moderately wet month: the 5th warmest and the 7th driest of the year.

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

Average high 15.7°C Daytime mean, May

Average low 7.5°C Night-time mean, May

Rainfall 61 mm 11 days with ≥1 mm

Daylight 16 h Sunrise to sunset, per day

May is a mild month in Swindon: daytime highs average 15.7°C and nights cool to about 7.5°C. By daytime temperature it is the 5th warmest of the 12 months.

Expect about 61 mm of rain on roughly 11 days, which makes May a moderately wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 15 h 35 min on an average May day.

The nearest other city in this atlas is Oxford (42 km away). In May its highs average 15.8°C, about as warm as Swindon, with 57 mm of rain.

Among the 143 cities listed in the United Kingdom, Swindon ranks joint 46th of 143 for the warmest May highs and joint 90th of 143 for the driest May (rainfall, lowest first). The mean May high of those 143 cities is 15.2°C; Swindon is 0.5°C warmer than that mean.

From May to June, average highs rise by 2.8°C to 18.5°C, and monthly rainfall falls from 61 mm to 56 mm.

The annual picture

May 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

Swindon climate table

1991–2020

Monthly climate averages for Swindon, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	6.8°C1.9°C	1.9°C	62	11.5	8.48 h
February	7.4°C1.7°C	1.7°C	48	9.9	9.910 h
March	9.7°C2.8°C	2.8°C	50	10.3	11.812 h
April	12.6°C4.5°C	4.5°C	57	11.4	13.814 h
May, selected	15.7°C7.5°C	7.5°C	61	11.2	15.616 h
June	18.5°C10.5°C	10.5°C	56	10.4	16.617 h
July	20.6°C12.5°C	12.5°C	59	10.9	16.116 h
August	20.2°C12.5°C	12.5°C	65	10.8	14.615 h
September	17.6°C10.4°C	10.4°C	54	9.3	12.713 h
October	13.7°C7.7°C	7.7°C	69	11.3	10.711 h
November	9.7°C4.5°C	4.5°C	68	12.0	8.99 h
December	7.1°C2.4°C	2.4°C	65	11.4	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

May in nearby cities

Distance from Swindon

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 Swindon) is explained once on the Swindon year overview and on the Sources, method and limits page.