Grand Coulee Weather in July
Average highs run from 83°F on July 1 to 90°F on July 31, and lows from 56°F to 61°F. Normal precipitation for the month is 0.49 in over about 3 wet days.
July day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
July at a glance
- Average high
- 88°F
- Average low
- 59°F
- Precipitation
- 0.49 in
- Record high
- 113°FJul 27, 1939
- Record low
- 32°FJul 4, 1983
- Chance of a freeze
- 0%
- Days of 90°F or more
- 14.0
- Daylight
- 15 h 58 min to 15 h 02 min
- Cloud cover
- 40%
- Humidity
- 47%
- Dew point
- 46°F
- Wind
- 6.0 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Jul 1 | 83°F | 56°F | 107°F 2021 | 43°F 1982 | 16% |
| Jul 2 | 83°F | 56°F | 101°F 2013 | 40°F 2000 | 16% |
| Jul 3 | 84°F | 56°F | 101°F 2013 | 43°F 1955 | 15% |
| Jul 4 | 84°F | 57°F | 102°F 1985 | 32°F 1983 | 15% |
| Jul 5 | 84°F | 57°F | 104°F 1968 | 44°F 1980 | 15% |
| Jul 6 | 85°F | 57°F | 105°F 1968 | 43°F 1977 | 14% |
| Jul 7 | 85°F | 58°F | 102°F 1968 | 42°F 1971 | 14% |
| Jul 8 | 86°F | 58°F | 102°F 1968 | 42°F 1981 | 13% |
| Jul 9 | 86°F | 58°F | 107°F 1985 | 45°F 1983 | 13% |
| Jul 10 | 86°F | 59°F | 103°F 2024 | 41°F 1972 | 13% |
| Jul 11 | 87°F | 59°F | 104°F 1940 | 45°F 1971 | 13% |
| Jul 12 | 87°F | 59°F | 104°F 1940 | 46°F 1943 | 12% |
| Jul 13 | 87°F | 59°F | 105°F 1935 | 43°F 1983 | 12% |
| Jul 14 | 88°F | 60°F | 108°F 1935 | 49°F 1981 | 12% |
| Jul 15 | 88°F | 60°F | 108°F 1938 | 46°F 1982 | 11% |
| Jul 16 | 88°F | 60°F | 109°F 1941 | 43°F 1986 | 11% |
| Jul 17 | 89°F | 60°F | 108°F 1941 | 47°F 2001 | 11% |
| Jul 18 | 89°F | 60°F | 108°F 1960 | 46°F 1945 | 11% |
| Jul 19 | 89°F | 61°F | 105°F 1936 | 46°F 1951 | 11% |
| Jul 20 | 89°F | 61°F | 108°F 1936 | 45°F 1951 | 10% |
| Jul 21 | 89°F | 61°F | 109°F 1938 | 47°F 1951 | 10% |
| Jul 22 | 90°F | 61°F | 109°F 1938 | 46°F 2001 | 10% |
| Jul 23 | 90°F | 61°F | 107°F 2006 | 46°F 1963 | 10% |
| Jul 24 | 90°F | 61°F | 106°F 1937 | 49°F 1948 | 9% |
| Jul 25 | 90°F | 61°F | 106°F 1939 | 48°F 1949 | 9% |
| Jul 26 | 90°F | 61°F | 110°F 1939 | 47°F 1951 | 9% |
| Jul 27 | 90°F | 61°F | 113°F 1939 | 49°F 1951 | 9% |
| Jul 28 | 90°F | 61°F | 107°F 1939 | 42°F 2001 | 9% |
| Jul 29 | 90°F | 61°F | 104°F 2003 | 38°F 2001 | 9% |
| Jul 30 | 90°F | 61°F | 103°F 2003 | 41°F 2001 | 9% |
| Jul 31 | 90°F | 61°F | 104°F 2021 | 39°F 2001 | 9% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PDT).
- July 1
- sunrise 5:01 AM, sunset 8:59 PM
- July 31
- sunrise 5:31 AM, sunset 8:33 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00451767 (Coulee Dam 1 Sw), public domain. Records: NOAA GHCN-Daily, station USC00451767, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.