Climate Grand Coulee - Washington
| JanJa | FebFe | MarMa | AprAp | MayMa | JunJu | |
|---|---|---|---|---|---|---|
| Average high in ºF Av. high Hi | 33 | 40 | 51 | 61 | 70 | 78 |
| Average low in ºF Av. low Lo | 23 | 25 | 31 | 37 | 45 | 51 |
| Av. precipitation in inch Av. precip. Pre. | 1.06 | 0.96 | 0.91 | 0.87 | 1.15 | 1.05 |
| JulJu | AugAu | SepSe | OctOc | NovNo | DecDe | |
|---|---|---|---|---|---|---|
| Average high in ºF Av. high Hi | 87 | 87 | 76 | 61 | 43 | 32 |
| Average low in ºF Av. low Lo | 58 | 57 | 49 | 39 | 30 | 22 |
| Av. precipitation in inch Av. precip. Pre. | 0.64 | 0.28 | 0.44 | 0.68 | 1.30 | 1.45 |
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 Climate Graph - Washington Climate Chart
Daily normals Grand Coulee - Washington - January
Day | High ºF | Low ºF | Prec/mo inch | Prec/yr inch | Snow/mo inch | Snow/yr inch |
|---|---|---|---|---|---|---|
| 1 Jan | 31.3 | 21.1 | 0.04 | 0.04 | 0.00 | 0.00 |
| 2 Jan | 31.4 | 21.2 | 0.08 | 0.08 | 0.00 | 0.00 |
| 3 Jan | 31.4 | 21.2 | 0.12 | 0.12 | 0.00 | 0.00 |
| 4 Jan | 31.5 | 21.3 | 0.16 | 0.16 | 0.00 | 0.00 |
| 5 Jan | 31.6 | 21.4 | 0.20 | 0.20 | 0.00 | 0.00 |
| 6 Jan | 31.8 | 21.5 | 0.24 | 0.24 | 0.00 | 0.00 |
| 7 Jan | 31.9 | 21.6 | 0.28 | 0.28 | 0.00 | 0.00 |
| 8 Jan | 32.0 | 21.7 | 0.31 | 0.31 | 0.00 | 0.00 |
| 9 Jan | 32.2 | 21.8 | 0.35 | 0.35 | 0.00 | 0.00 |
| 10 Jan | 32.3 | 22.0 | 0.39 | 0.39 | 0.00 | 0.00 |
| 11 Jan | 32.4 | 22.1 | 0.43 | 0.43 | 0.00 | 0.00 |
| 12 Jan | 32.6 | 22.2 | 0.47 | 0.47 | 0.00 | 0.00 |
| 13 Jan | 32.8 | 22.3 | 0.47 | 0.47 | 0.00 | 0.00 |
| 14 Jan | 32.9 | 22.4 | 0.51 | 0.51 | 0.00 | 0.00 |
| 15 Jan | 33.1 | 22.6 | 0.55 | 0.55 | 0.00 | 0.00 |
| 16 Jan | 33.2 | 22.7 | 0.59 | 0.59 | 0.00 | 0.00 |
| 17 Jan | 33.4 | 22.8 | 0.63 | 0.63 | 0.00 | 0.00 |
| 18 Jan | 33.6 | 22.9 | 0.67 | 0.67 | 0.00 | 0.00 |
| 19 Jan | 33.8 | 23.0 | 0.71 | 0.71 | 0.00 | 0.00 |
| 20 Jan | 34.0 | 23.1 | 0.71 | 0.71 | 0.00 | 0.00 |
| 21 Jan | 34.1 | 23.2 | 0.75 | 0.75 | 0.00 | 0.00 |
| 22 Jan | 34.3 | 23.3 | 0.79 | 0.79 | 0.00 | 0.00 |
| 23 Jan | 34.5 | 23.4 | 0.83 | 0.83 | 0.00 | 0.00 |
| 24 Jan | 34.7 | 23.5 | 0.87 | 0.87 | 0.00 | 0.00 |
| 25 Jan | 34.9 | 23.6 | 0.87 | 0.87 | 0.00 | 0.00 |
| 26 Jan | 35.1 | 23.6 | 0.91 | 0.91 | 0.00 | 0.00 |
| 27 Jan | 35.3 | 23.7 | 0.94 | 0.94 | 0.00 | 0.00 |
| 28 Jan | 35.5 | 23.8 | 0.98 | 0.98 | 0.00 | 0.00 |
| 29 Jan | 35.7 | 23.8 | 0.98 | 0.98 | 0.00 | 0.00 |
| 30 Jan | 35.9 | 23.9 | 1.02 | 1.02 | 0.00 | 0.00 |
| 31 Jan | 36.1 | 24.0 | 1.06 | 1.06 | 0.00 | 0.00 |
Weather history Grand Coulee - May 2026
| Day | High ºF | Low ºF | Precip. inch | Snow inch | Snow d. inch |
|---|---|---|---|---|---|
| 01 May | 73.9 | 44.1 | 0.00 | 0.00 | 0.0 |
| 02 May | 80.1 | 48.9 | 0.00 | 0.00 | 0.0 |
| 03 May | 82.0 | 48.9 | 0.00 | 0.00 | 0.0 |
| 04 May | 84.0 | 52.0 | 0.00 | 0.00 | 0.0 |
| 05 May | 82.9 | 51.1 | 0.00 | 0.00 | 0.0 |
| 06 May | 82.0 | 53.1 | 0.00 | 0.00 | 0.0 |
| 07 May | 78.1 | 51.1 | 0.00 | 0.00 | 0.0 |
| 08 May | 77.0 | 52.0 | 0.00 | 0.00 | 0.0 |
| 09 May | 73.9 | 50.0 | 0.00 | 0.00 | 0.0 |
| 10 May | 73.0 | 48.0 | 0.00 | 0.00 | 0.0 |
| 11 May | - | - | - | - | - |
| 12 May | - | - | - | - | - |
| 13 May | 81.0 | 51.1 | 0.35 | 0.00 | 0.0 |
| 14 May | 63.0 | 46.9 | 0.00 | 0.00 | 0.0 |
| 15 May | 57.9 | 41.0 | 0.00 | 0.00 | 0.0 |
| 16 May | 55.9 | 37.0 | 0.09 | 0.00 | 0.0 |
| 17 May | 69.1 | 37.0 | 0.00 | 0.00 | 0.0 |
| 18 May | 66.9 | 44.1 | 0.00 | 0.00 | 0.0 |
| 19 May | 69.1 | 42.1 | 0.00 | 0.00 | 0.0 |
| 20 May | 73.9 | 46.0 | 0.00 | 0.00 | 0.0 |
| 21 May | 73.0 | 46.0 | 0.00 | 0.00 | 0.0 |
| 22 May | 79.0 | 46.9 | 0.00 | 0.00 | 0.0 |
| 23 May | 82.0 | 53.1 | 0.00 | 0.00 | 0.0 |
| 24 May | 81.0 | 55.9 | 0.00 | 0.00 | 0.0 |
| 25 May | 79.0 | 55.0 | 0.00 | 0.00 | 0.0 |
| 26 May | 77.0 | 48.9 | 0.02 | 0.00 | 0.0 |
| 27 May | 82.0 | 57.0 | 0.00 | 0.00 | 0.0 |
| 28 May | 91.9 | 60.1 | 0.00 | 0.00 | 0.0 |
| 29 May | - | - | - | - | - |
| 30 May | - | - | - | - | - |
| 31 May | - | - | - | - | - |
Past weather Grand Coulee
| May 26 | Normal | ||
|---|---|---|---|
| Average high temperature Av. high temp. | 75.7 ºF | 33 ºF | |
| Average low temperature Av. low temp. | 48.7 ºF | 23 ºF | |
| Total precipitation Total precip. | 0.46 inch | 1.06 inch | |
| Total snowfall Total snowfall | 0.00 inch | 0 inch | |
| Highest max temperature Highest max temp. | 91.9 ºF | - | |
| Lowest max temperature Lowest max temp. | 55.9 ºF | - | |
| Highest min temperature Highest min temp. | 60.1 ºF | - | |
| Lowest min temperature Lowest min temp. | 37.0 ºF | - | |
Past weather May 2026 incomplete - Missing data
Geo Grand Coulee - Washington
| Country | United States | |
|---|---|---|
| State | Washington | |
| County | - | |
| City | Grand Coulee | |
| Zip Code | 99133 | |
| Longitude | -119 dec. degr. | |
| Latitude | 47.94 dec. degr. | |
| Altitude - Elevation | 1532ft | |
| ICAO | - | |
| IATA | - |
Date and Time Grand Coulee - Washington
| Local Time | 12:40 AM | |
|---|---|---|
| Sunrise | 04:54 AM | |
| Sunset | 09:00 PM | |
| Day/Night | Night | |
| Timezone | Pacific Daylight Time | |
| Timezone DB | America - Los Angeles |
Map of Grand Coulee - Washington
USGS National Map — Open interactive map
Grand Coulee weather averages
| Annual high temperature | 60ºF |
| Annual low temperature | 39ºF |
| Average annual precip. | 10.79 inch |
Station Data
Monthly averages Grand Coulee
Longitude: -119.002, Latitude: 47.9397
Average weather Grand Coulee, WA - 99133
Monthly: 1991-2020 normals
History: 2008-2026
Abbreviations
Average precipitation in : Av. precipitation in
Jan: January, Feb: February, ...Jan: January, Feb: February, ...Ja: January, Fe: February, ...