Climate averages 1991–2020

Slough weather
in January.

A cold, moderately wet month: the coolest and the joint 7th driest of the year.

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

Average high 7.3°C Daytime mean, January

Average low 2.3°C Night-time mean, January

Rainfall 55 mm 11 days with ≥1 mm

Daylight 8 h Sunrise to sunset, per day

January is a cold month in Slough: daytime highs average 7.3°C and nights cool to about 2.3°C. By daytime temperature it is the coolest month of the year.

Expect about 55 mm of rain on roughly 11 days, which makes January a moderately wet month (the joint 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 8 h 24 min on an average January day.

The nearest other city in this atlas is Maidenhead (9 km away). In January its highs average 7.3°C, about as warm as Slough, with 55 mm of rain.

Among the 143 cities listed in the United Kingdom, Slough ranks joint 26th of 143 for the warmest January highs and joint 45th of 143 for the driest January (rainfall, lowest first). The mean January high of those 143 cities is 6.9°C; Slough is 0.4°C warmer than that mean.

From January to February, average highs rise by 0.5°C to 7.8°C, and monthly rainfall falls from 55 mm to 45 mm.

The annual picture

January 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

Slough climate table

1991–2020

Monthly climate averages for Slough, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January, selected	7.3°C2.3°C	2.3°C	55	10.9	8.48 h
February	7.8°C2.1°C	2.1°C	45	9.2	9.910 h
March	10.3°C3.3°C	3.3°C	43	10.1	11.812 h
April	13.2°C5.1°C	5.1°C	49	11.2	13.814 h
May	16.3°C8.2°C	8.2°C	52	9.8	15.616 h
June	19.2°C11.1°C	11.1°C	55	9.8	16.517 h
July	21.4°C13.3°C	13.3°C	53	10.6	16.116 h
August	21.0°C13.2°C	13.2°C	60	10.3	14.615 h
September	18.3°C11.0°C	11.0°C	47	8.9	12.713 h
October	14.4°C8.4°C	8.4°C	60	11.2	10.711 h
November	10.2°C5.0°C	5.0°C	64	11.0	8.99 h
December	7.5°C2.9°C	2.9°C	58	11.0	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

January in nearby cities

Distance from Slough

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

Hayes and Uxbridge lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.