Climate averages 1991–2020

Gresham weather
in July.

A warm, very dry month: the 2nd warmest and the driest of the year. Meets the pleasant-weather rule

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

Average high 25.5°C Daytime mean, July

Average low 13.6°C Night-time mean, July

Rainfall 14 mm 3 days with ≥1 mm

Daylight 15 h Sunrise to sunset, per day

July is a warm month in Gresham: daytime highs average 25.5°C and nights cool to about 13.6°C. By daytime temperature it is the 2nd warmest of the 12 months.

Expect about 14 mm of rain on roughly 3 days, which makes July a very dry month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 15 h 18 min on an average July day.

The nearest other city in this atlas is Portland (19 km away). In July its highs average 27.1°C, 1.6°C warmer than Gresham, with 12 mm of rain.

Among the 498 cities listed in the United States, Gresham ranks joint 467th of 498 for the warmest July highs and joint 131st of 498 for the driest July (rainfall, lowest first). The mean July high of those 498 cities is 30.3°C; Gresham is 4.8°C cooler than that mean.

From July to August, average highs rise by 0.6°C to 26.1°C, and monthly rainfall rises from 14 mm to 20 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

Gresham climate table

1991–2020

Monthly climate averages for Gresham, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	7.5°C1.1°C	1.1°C	220	18.3	9.19 h
February	9.1°C1.2°C	1.2°C	167	15.7	10.310 h
March	11.5°C2.4°C	2.4°C	178	18.2	11.912 h
April	14.0°C4.5°C	4.5°C	142	16.6	13.513 h
May	17.8°C7.9°C	7.9°C	89	11.6	14.915 h
June	20.5°C10.6°C	10.6°C	58	9.0	15.616 h
July, selected	25.5°C13.6°C	13.6°C	14	2.9	15.315 h
August	26.1°C13.9°C	13.9°C	20	2.9	14.114 h
September	22.8°C11.3°C	11.3°C	58	6.4	12.613 h
October	16.0°C7.1°C	7.1°C	147	12.9	11.011 h
November	10.2°C3.4°C	3.4°C	230	18.0	9.610 h
December	6.8°C1.0°C	1.0°C	244	18.5	8.89 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 Gresham

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