Climate averages 1991–2020

Liverpool weather
in September.

A mild, wet month: the 4th warmest and the 8th driest of the year.

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

Average high 16.5°C Daytime mean, September

Average low 11.4°C Night-time mean, September

Rainfall 96 mm 14 days with ≥1 mm

Daylight 13 h Sunrise to sunset, per day

September is a mild month in Liverpool: daytime highs average 16.5°C and nights cool to about 11.4°C. By daytime temperature it is the 4th warmest of the 12 months.

Expect about 96 mm of rain on roughly 14 days, which makes September a wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 45 min on an average September day.

The nearest other city in this atlas is St Helens (17 km away). In September its highs average 16.6°C, about as warm as Liverpool, with 78 mm of rain.

Among the 143 cities listed in the United Kingdom, Liverpool ranks joint 108th of 143 for the warmest September highs and joint 138th of 143 for the driest September (rainfall, lowest first). The mean September high of those 143 cities is 17.3°C; Liverpool is 0.8°C cooler than that mean.

From September to October, average highs fall by 3.3°C to 13.2°C, and monthly rainfall rises from 96 mm to 115 mm.

The annual picture

September 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

Liverpool climate table

1991–2020

Monthly climate averages for Liverpool, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	6.9°C3.1°C	3.1°C	91	16.3	8.18 h
February	7.3°C2.9°C	2.9°C	76	13.9	9.810 h
March	9.1°C3.8°C	3.8°C	72	13.7	11.812 h
April	11.5°C5.5°C	5.5°C	67	12.7	14.014 h
May	14.5°C8.4°C	8.4°C	69	12.6	15.916 h
June	16.9°C11.3°C	11.3°C	83	13.5	16.917 h
July	18.6°C13.2°C	13.2°C	87	15.9	16.516 h
August	18.4°C13.3°C	13.3°C	99	16.4	14.815 h
September, selected	16.5°C11.4°C	11.4°C	96	14.1	12.813 h
October	13.2°C8.8°C	8.8°C	115	16.4	10.611 h
November	9.6°C5.9°C	5.9°C	115	17.9	8.79 h
December	7.3°C3.6°C	3.6°C	121	17.0	7.68 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

September in nearby cities

Distance from Liverpool

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