Cold steppe climate
Climate Grand Coulee - Washington
Annual high60ºF
Annual low39ºF
Precipitation10.79 inch
| Month | HighºF | LowºF | Precipinch |
|---|---|---|---|
| Jan | 33 | 23 | 1.06 |
| Feb | 40 | 25 | 0.96 |
| Mar | 51 | 31 | 0.91 |
| Apr | 61 | 37 | 0.87 |
| May | 70 | 45 | 1.15 |
| Jun | 78 | 51 | 1.05 |
| Jul | 87 | 58 | 0.64 |
| Aug | 87 | 57 | 0.28 |
| Sep | 76 | 49 | 0.44 |
| Oct | 61 | 39 | 0.68 |
| Nov | 43 | 30 | 1.30 |
| Dec | 32 | 22 | 1.45 |
- JanHigh 33ºFLow 23ºFPrecip 1.06 inch
- FebHigh 40ºFLow 25ºFPrecip 0.96 inch
- MarHigh 51ºFLow 31ºFPrecip 0.91 inch
- AprHigh 61ºFLow 37ºFPrecip 0.87 inch
- MayHigh 70ºFLow 45ºFPrecip 1.15 inch
- JunHigh 78ºFLow 51ºFPrecip 1.05 inch
- JulHigh 87ºFLow 58ºFPrecip 0.64 inch
- AugHigh 87ºFLow 57ºFPrecip 0.28 inch
- SepHigh 76ºFLow 49ºFPrecip 0.44 inch
- OctHigh 61ºFLow 39ºFPrecip 0.68 inch
- NovHigh 43ºFLow 30ºFPrecip 1.30 inch
- DecHigh 32ºFLow 22ºFPrecip 1.45 inch
Climate summary
What is the average weather in Grand Coulee, Washington?
Grand Coulee experiences a cold semi-arid climate, marked by very large seasonal temperature contrasts due to its inland location. Summers are warm, but winters are cold. The area is dry overall, with low annual precipitation. Summers are particularly dry, while winters bring more moisture.
Grand Coulee weather averages
Annual high60ºF
Annual low39ºF
Precipitation10.79 inch
Daily normals Grand Coulee - Washington - January
| Day | HighºF | LowºF | Prec/ | Prec/ |
|---|---|---|---|---|
| Jan 1 | 31.3 | 21.1 | 0.04 | 0.04 |
| Jan 2 | 31.4 | 21.2 | 0.08 | 0.08 |
| Jan 3 | 31.4 | 21.2 | 0.12 | 0.12 |
| Jan 4 | 31.5 | 21.3 | 0.16 | 0.16 |
| Jan 5 | 31.6 | 21.4 | 0.20 | 0.20 |
| Jan 6 | 31.8 | 21.5 | 0.24 | 0.24 |
| Jan 7 | 31.9 | 21.6 | 0.28 | 0.28 |
| Jan 8 | 32.0 | 21.7 | 0.31 | 0.31 |
| Jan 9 | 32.2 | 21.8 | 0.35 | 0.35 |
| Jan 10 | 32.3 | 22.0 | 0.39 | 0.39 |
| Jan 11 | 32.4 | 22.1 | 0.43 | 0.43 |
| Jan 12 | 32.6 | 22.2 | 0.47 | 0.47 |
| Jan 13 | 32.8 | 22.3 | 0.47 | 0.47 |
| Jan 14 | 32.9 | 22.4 | 0.51 | 0.51 |
| Jan 15 | 33.1 | 22.6 | 0.55 | 0.55 |
| Jan 16 | 33.2 | 22.7 | 0.59 | 0.59 |
| Jan 17 | 33.4 | 22.8 | 0.63 | 0.63 |
| Jan 18 | 33.6 | 22.9 | 0.67 | 0.67 |
| Jan 19 | 33.8 | 23.0 | 0.71 | 0.71 |
| Jan 20 | 34.0 | 23.1 | 0.71 | 0.71 |
| Jan 21 | 34.1 | 23.2 | 0.75 | 0.75 |
| Jan 22 | 34.3 | 23.3 | 0.79 | 0.79 |
| Jan 23 | 34.5 | 23.4 | 0.83 | 0.83 |
| Jan 24 | 34.7 | 23.5 | 0.87 | 0.87 |
| Jan 25 | 34.9 | 23.6 | 0.87 | 0.87 |
| Jan 26 | 35.1 | 23.6 | 0.91 | 0.91 |
| Jan 27 | 35.3 | 23.7 | 0.94 | 0.94 |
| Jan 28 | 35.5 | 23.8 | 0.98 | 0.98 |
| Jan 29 | 35.7 | 23.8 | 0.98 | 0.98 |
| Jan 30 | 35.9 | 23.9 | 1.02 | 1.02 |
| Jan 31 | 36.1 | 24.0 | 1.06 | 1.06 |
Precipitation and snow add up through the month (/mo) and the year (/yr)
Weather history Grand Coulee - May 2026
| Day | HighºF | LowºF | Precip.inch |
|---|---|---|---|
| May 1 | 73.9 | 44.1 | 0.00 |
| May 2 | 80.1 | 48.9 | 0.00 |
| May 3 | 82.0 | 48.9 | 0.00 |
| May 4 | 84.0 | 52.0 | 0.00 |
| May 5 | 82.9 | 51.1 | 0.00 |
| May 6 | 82.0 | 53.1 | 0.00 |
| May 7 | 78.1 | 51.1 | 0.00 |
| May 8 | 77.0 | 52.0 | 0.00 |
| May 9 | 73.9 | 50.0 | 0.00 |
| May 10 | 73.0 | 48.0 | 0.00 |
| May 11 | – | – | – |
| May 12 | – | – | – |
| May 13 | 81.0 | 51.1 | 0.35 |
| May 14 | 63.0 | 46.9 | 0.00 |
| May 15 | 57.9 | 41.0 | 0.00 |
| May 16 | 55.9 | 37.0 | 0.09 |
| May 17 | 69.1 | 37.0 | 0.00 |
| May 18 | 66.9 | 44.1 | 0.00 |
| May 19 | 69.1 | 42.1 | 0.00 |
| May 20 | 73.9 | 46.0 | 0.00 |
| May 21 | 73.0 | 46.0 | 0.00 |
| May 22 | 79.0 | 46.9 | 0.00 |
| May 23 | 82.0 | 53.1 | 0.00 |
| May 24 | 81.0 | 55.9 | 0.00 |
| May 25 | 79.0 | 55.0 | 0.00 |
| May 26 | 77.0 | 48.9 | 0.02 |
| May 27 | 82.0 | 57.0 | 0.00 |
| May 28 | 91.9 | 60.1 | 0.00 |
| May 29 | – | – | – |
| May 30 | – | – | – |
| May 31 | – | – | – |
The data for May 2026 is incomplete: some days or values are missing.
- –No data
- –Not yet observed or received
- TTrace, too small to measure
Observed extremes
- Highest max temperature91.9ºF · May 28
- Lowest max temperature55.9ºF · May 16
- Highest min temperature60.1ºF · May 28
- Lowest min temperature37.0ºF · May 16
Geo Grand Coulee - Washington
Location
- Country
- United States
- State
- Washington
- County
- –
- City
- Grand Coulee
- Zip Code
- 99133
- Elevation
- 1532 ft
- Longitude
- -119.00
- Latitude
- 47.94
- ICAO
- –
- IATA
- –