Climate averages 1991–2020

Blackburn weather
in July.

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

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

Average high 18.2°C Daytime mean, July

Average low 11.6°C Night-time mean, July

Rainfall 99 mm 16 days with ≥1 mm

Daylight 17 h Sunrise to sunset, per day

July is a mild month in Blackburn: daytime highs average 18.2°C and nights cool to about 11.6°C. By daytime temperature it is the warmest month of the year.

Expect about 99 mm of rain on roughly 16 days, which makes July a wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 16 h 31 min on an average July day.

The nearest other city in this atlas is Preston (15 km away). In July its highs average 18.4°C, about as warm as Blackburn, with 98 mm of rain.

Among the 143 cities listed in the United Kingdom, Blackburn ranks joint 129th of 143 for the warmest July highs and 142nd of 143 for the driest July (rainfall, lowest first). The mean July high of those 143 cities is 20.0°C; Blackburn is 1.8°C cooler than that mean.

From July to August, average highs fall by 0.3°C to 17.9°C, and monthly rainfall rises from 99 mm to 108 mm.

The annual picture

July 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

Blackburn climate table

1991–2020

Monthly climate averages for Blackburn, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	6.0°C1.5°C	1.5°C	103	16.3	8.18 h
February	6.5°C1.3°C	1.3°C	90	14.1	9.710 h
March	8.5°C2.1°C	2.1°C	84	13.8	11.812 h
April	11.2°C3.8°C	3.8°C	75	13.6	14.014 h
May	14.2°C6.7°C	6.7°C	79	13.6	15.916 h
June	16.5°C9.7°C	9.7°C	91	14.3	17.017 h
July, selected	18.2°C11.6°C	11.6°C	99	15.9	16.517 h
August	17.9°C11.6°C	11.6°C	108	16.4	14.815 h
September	15.7°C9.6°C	9.6°C	91	13.6	12.813 h
October	12.4°C7.1°C	7.1°C	108	15.4	10.611 h
November	8.7°C4.1°C	4.1°C	107	16.4	8.69 h
December	6.3°C1.8°C	1.8°C	119	16.2	7.58 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

July in nearby cities

Distance from Blackburn

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