Climate averages 1991–2020

Detroit weather
in July.

A warm, moderately wet month: the warmest and the 9th driest of the year.

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

Average high 27.2°C Daytime mean, July

Average low 19.2°C Night-time mean, July

Rainfall 78 mm 11 days with ≥1 mm

Daylight 15 h Sunrise to sunset, per day

July is a warm month in Detroit: daytime highs average 27.2°C and nights cool to about 19.2°C. By daytime temperature it is the warmest month of the year.

Expect about 78 mm of rain on roughly 11 days, which makes July a moderately wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 57 min on an average July day.

The nearest other city in this atlas is Dearborn (11 km away). In July its highs average 27.5°C, about as warm as Detroit, with 81 mm of rain.

Among the 498 cities listed in the United States, Detroit ranks joint 414th of 498 for the warmest July highs and joint 242nd of 498 for the driest July (rainfall, lowest first). The mean July high of those 498 cities is 30.3°C; Detroit is 3.1°C cooler than that mean.

From July to August, average highs fall by 1.1°C to 26.1°C, and monthly rainfall falls from 78 mm to 76 mm.

The annual picture

July in context

30-year average

Average highAverage low°C

Monthly precipitation

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

Detroit climate table

1991–2020

Monthly climate averages for Detroit, 1991–2020
Month	Average highHigh / low	Average low	Precipitation mm/month	Wet days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	-0.6°C-7.5°C	-7.5°C	64	10.2	9.59 h
February	0.8°C-7.1°C	-7.1°C	55	8.4	10.511 h
March	6.0°C-2.7°C	-2.7°C	65	9.6	11.912 h
April	13.0°C4.1°C	4.1°C	91	12.0	13.313 h
May	19.6°C10.9°C	10.9°C	90	12.7	14.615 h
June	24.9°C16.7°C	16.7°C	86	10.9	15.215 h
July, selected	27.2°C19.2°C	19.2°C	78	10.7	14.915 h
August	26.1°C18.6°C	18.6°C	76	9.6	13.914 h
September	22.3°C14.9°C	14.9°C	67	8.3	12.513 h
October	15.3°C8.4°C	8.4°C	68	8.9	11.111 h
November	8.0°C2.0°C	2.0°C	69	9.0	9.810 h
December	2.2°C-3.4°C	-3.4°C	62	9.1	9.19 h

Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet 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 Detroit

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