Climate averages 1991–2020

Chelmsford weather
in October.

A cool, moderately wet month: the 6th warmest and the joint 10th driest of the year.

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

Average high 14.4°C Daytime mean, October

Average low 9.0°C Night-time mean, October

Rainfall 55 mm 11 days with ≥1 mm

Daylight 11 h Sunrise to sunset, per day

October is a cool month in Chelmsford: daytime highs average 14.4°C and nights cool to about 9.0°C. By daytime temperature it is the 6th warmest of the 12 months.

Expect about 55 mm of rain on roughly 11 days, which makes October a moderately wet month (the joint 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 43 min on an average October day.

The nearest other city in this atlas is Basildon (19 km away). In October its highs average 14.4°C, about as warm as Chelmsford, with 56 mm of rain.

Among the 143 cities listed in the United Kingdom, Chelmsford ranks joint 23rd of 143 for the warmest October highs and 1st of 143 for the driest October (rainfall, lowest first). The mean October high of those 143 cities is 13.6°C; Chelmsford is 0.8°C warmer than that mean.

From October to November, average highs fall by 4.2°C to 10.2°C, and monthly rainfall stays at 55 mm.

The annual picture

October 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

Chelmsford climate table

1991–2020

Monthly climate averages for Chelmsford, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	7.2°C2.7°C	2.7°C	50	10.7	8.48 h
February	7.6°C2.5°C	2.5°C	41	9.1	9.910 h
March	9.9°C3.8°C	3.8°C	39	10.0	11.812 h
April	12.7°C5.6°C	5.6°C	46	10.8	13.814 h
May	15.8°C8.6°C	8.6°C	51	9.8	15.616 h
June	18.8°C11.6°C	11.6°C	53	9.9	16.617 h
July	21.2°C13.8°C	13.8°C	53	10.8	16.216 h
August	21.1°C13.9°C	13.9°C	59	9.9	14.615 h
September	18.3°C11.8°C	11.8°C	46	8.8	12.713 h
October, selected	14.4°C9.0°C	9.0°C	55	10.5	10.711 h
November	10.2°C5.5°C	5.5°C	55	10.4	8.99 h
December	7.6°C3.3°C	3.3°C	54	10.5	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

October in nearby cities

Distance from Chelmsford

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