Climate averages 1991–2020

Grimsby weather
in August.

A mild, moderately wet month: one of the warmest and the 11th driest of the year.

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

Average high 19.9°C Daytime mean, August

Average low 13.0°C Night-time mean, August

Rainfall 66 mm 12 days with ≥1 mm

Daylight 15 h Sunrise to sunset, per day

August is a mild month in Grimsby: daytime highs average 19.9°C and nights cool to about 13.0°C. By daytime temperature it is one of the warmest months of the year.

Expect about 66 mm of rain on roughly 12 days, which makes August a moderately wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 49 min on an average August day.

The nearest other city in this atlas is Kingston upon Hull (26 km away). In August its highs average 19.7°C, about as warm as Grimsby, with 67 mm of rain.

Among the 143 cities listed in the United Kingdom, Grimsby ranks joint 68th of 143 for the warmest August highs and joint 77th of 143 for the driest August (rainfall, lowest first). The mean August high of those 143 cities is 19.7°C; Grimsby is 0.2°C warmer than that mean.

From August to September, average highs fall by 2.5°C to 17.4°C, and monthly rainfall falls from 66 mm to 56 mm.

The annual picture

August 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

Grimsby climate table

1991–2020

Monthly climate averages for Grimsby, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	6.9°C2.4°C	2.4°C	49	11.2	8.18 h
February	7.5°C2.2°C	2.2°C	40	9.8	9.810 h
March	9.5°C3.3°C	3.3°C	43	11.1	11.812 h
April	11.8°C5.0°C	5.0°C	48	11.2	14.014 h
May	14.6°C7.8°C	7.8°C	52	10.9	15.916 h
June	17.5°C10.7°C	10.7°C	65	11.8	16.917 h
July	19.9°C12.9°C	12.9°C	70	12.7	16.516 h
August, selected	19.9°C13.0°C	13.0°C	66	11.7	14.815 h
September	17.4°C11.1°C	11.1°C	56	9.7	12.813 h
October	13.8°C8.4°C	8.4°C	59	10.7	10.611 h
November	9.8°C5.1°C	5.1°C	55	11.9	8.79 h
December	7.1°C2.8°C	2.8°C	52	11.2	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

August in nearby cities

Distance from Grimsby

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