Climate averages 1991–2020

Suffolk weather
in July.

A hot, wet month: the warmest and the wettest of the year.

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

Average high 30.8°C Daytime mean, July

Average low 22.2°C Night-time mean, July

Rainfall 128 mm 15 days with ≥1 mm

Daylight 14 h Sunrise to sunset, per day

July is a hot month in Suffolk: daytime highs average 30.8°C and nights cool to about 22.2°C. By daytime temperature it is the warmest month of the year.

Expect about 128 mm of rain on roughly 15 days, which makes July a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 14 h 25 min on an average July day.

The nearest other city in this atlas is Portsmouth Heights (22 km away). In July its highs average 30.6°C, about as warm as Suffolk, with 131 mm of rain.

Among the 498 cities listed in the United States, Suffolk ranks joint 211th of 498 for the warmest July highs and 463rd of 498 for the driest July (rainfall, lowest first). The mean July high of those 498 cities is 30.3°C; Suffolk is 0.5°C warmer than that mean.

From July to August, average highs fall by 1.1°C to 29.7°C, and monthly rainfall falls from 128 mm to 120 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

Suffolk climate table

1991–2020

Monthly climate averages for Suffolk, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	9.5°C1.1°C	1.1°C	88	9.3	10.010 h
February	11.3°C1.9°C	1.9°C	78	8.8	10.811 h
March	15.2°C5.1°C	5.1°C	100	10.6	11.912 h
April	20.6°C10.1°C	10.1°C	86	9.5	13.113 h
May	24.8°C15.0°C	15.0°C	97	10.8	14.114 h
June	28.8°C19.7°C	19.7°C	103	11.7	14.615 h
July, selected	30.8°C22.2°C	22.2°C	128	14.8	14.414 h
August	29.7°C21.5°C	21.5°C	120	13.1	13.614 h
September	26.6°C18.8°C	18.8°C	123	10.9	12.512 h
October	21.4°C12.9°C	12.9°C	93	7.6	11.311 h
November	15.7°C7.2°C	7.2°C	87	8.4	10.210 h
December	11.5°C3.3°C	3.3°C	89	9.5	9.710 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 Suffolk

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