Grand Coulee Weather Forecast 15 Days, Weather in Grand Coulee Today
Current weather conditions and 15 day weather forecast for Grand Coulee, Washington, USA including weather daily high/low temperature, warnings, chance of precipitation, pressure, humidity/wind chill, rain risk, wind speed, cloud, pressure, and UV index.
Current weather conditions at Grand Coulee
| 20 May 2026 Wednesday 23.3 ° C / 73.9°F  Sunny |
Feels Like : 23.3 ° C / 74°F Humidity : % 26 Pressure : 1012 mb Wind Speed : 20.2 kmph / 12.5 miles from WNW  Visibility : 10 km Precipitation (rainfall) : 0 mm Cloud (%) : 12 |
15 day weather forecast for Grand Coulee, WA, USA
Weather Forecast for next 15 Days for Grand Coulee including weather warnings, temperature, rain, wind speed, cloud, snow, wind speed and wind direction, pressure and UV index.Here is weather for the next 15 days in Grand Coulee, Washington state, US. To see the daily forecast, scroll to the table below.
| Date | Weather forecast | Low temperature | High temperature | Avg. temperature | Humidity | Chance of rain | UV Index | Sun Position | Moon Position | |
|---|---|---|---|---|---|---|---|---|---|---|
| 20 May 2026 Wednesday | Sunny |
6.8 ° C (44.2°F) |
23.5 ° C (74.3°F) |
15.4 ° C (59.7°F) |
% 42 | 0% | 6.9 | Sunrise:05:11 AM Sunset: 08:34 PM |
Moonrise:08:44 AM Moonset: 12:34 AM Moon Phase ( Waxing Crescent ) |
|
| 21 May 2026 Thursday | Sunny |
5.6 ° C (42.1°F) |
23.2 ° C (73.8°F) |
15.4 ° C (59.6°F) |
% 32 | 0% | 0 | Sunrise:05:10 AM Sunset: 08:36 PM |
Moonrise:10:08 AM Moonset: 01:10 AM Moon Phase ( Waxing Crescent ) |
|
| 22 May 2026 Friday | Sunny |
8.2 ° C (46.8°F) |
25.3 ° C (77.5°F) |
17.4 ° C (63.4°F) |
% 41 | 0% | 5 | Sunrise:05:09 AM Sunset: 08:37 PM |
Moonrise:11:30 AM Moonset: 01:36 AM Moon Phase ( Waxing Crescent ) |
|
| 23 May 2026 Saturday | Sunny |
9.6 ° C (49.3°F) |
25.7 ° C (78.3°F) |
16.1 ° C (61°F) |
% 48 | 0% | 5 | Sunrise:05:08 AM Sunset: 08:38 PM |
Moonrise:12:47 PM Moonset: 01:56 AM Moon Phase ( First Quarter ) |
|
| 24 May 2026 Sunday |  Partly Cloudy |
7.6 ° C (45.7°F) |
20.5 ° C (68.9°F) |
14 ° C (57.2°F) |
% 37 | 0% | 4 | Sunrise:05:07 AM Sunset: 08:39 PM |
Moonrise:02:00 PM Moonset: 02:12 AM Moon Phase ( Waxing Gibbous ) |
|
| 25 May 2026 Monday | Sunny |
8.5 ° C (47.2°F) |
24.9 ° C (76.8°F) |
16.3 ° C (61.3°F) |
% 39 | 0% | 5 | Sunrise:05:06 AM Sunset: 08:40 PM |
Moonrise:03:11 PM Moonset: 02:27 AM Moon Phase ( Waxing Gibbous ) |
|
| 26 May 2026 Tuesday | Sunny |
5.3 ° C (41.6°F) |
24.4 ° C (76°F) |
15.4 ° C (59.7°F) |
% 32 | 0% | 5 | Sunrise:05:05 AM Sunset: 08:41 PM |
Moonrise:04:20 PM Moonset: 02:41 AM Moon Phase ( Waxing Gibbous ) |
|
| 27 May 2026 Wednesday | Sunny |
8.2 ° C (46.8°F) |
27.9 ° C (82.3°F) |
18.7 ° C (65.7°F) |
% 32 | 0% | 5 | Sunrise:05:04 AM Sunset: 08:42 PM |
Moonrise:05:30 PM Moonset: 02:57 AM Moon Phase ( Waxing Gibbous ) |
|
| 28 May 2026 Thursday | Sunny |
11.1 ° C (52°F) |
33.5 ° C (92.3°F) |
22.8 ° C (73°F) |
% 29 | 0% | 6 | Sunrise:05:04 AM Sunset: 08:43 PM |
Moonrise:06:39 PM Moonset: 03:15 AM Moon Phase ( Waxing Gibbous ) |
|
| 29 May 2026 Friday | Sunny |
14.4 ° C (57.9°F) |
35.6 ° C (96°F) |
25.6 ° C (78.1°F) |
% 29 | 0% | 7 | Sunrise:05:03 AM Sunset: 08:44 PM |
Moonrise:07:49 PM Moonset: 03:36 AM Moon Phase ( Waxing Gibbous ) |
|
| 30 May 2026 Saturday | Sunny |
16.7 ° C (62.1°F) |
33.6 ° C (92.5°F) |
25.5 ° C (77.9°F) |
% 36 | 0% | 7 | Sunrise:05:02 AM Sunset: 08:45 PM |
Moonrise:08:56 PM Moonset: 04:02 AM Moon Phase ( Waxing Gibbous ) |
|
| 31 May 2026 Sunday |  Patchy rain nearby |
15.6 ° C (60.1°F) |
31.5 ° C (88.6°F) |
23.8 ° C (74.9°F) |
% 55 | 82% | 5 | Sunrise:05:01 AM Sunset: 08:46 PM |
Moonrise:09:56 PM Moonset: 04:37 AM Moon Phase ( Full Moon ) |
|
| 01 June 2026 Monday | Sunny |
15.2 ° C (59.4°F) |
29.1 ° C (84.5°F) |
22.1 ° C (71.8°F) |
% 62 | 0% | 6 | Sunrise:05:01 AM Sunset: 08:47 PM |
Moonrise:10:47 PM Moonset: 05:22 AM Moon Phase ( Waning Gibbous ) |
|
| 02 June 2026 Tuesday | Patchy rain nearby |
12.2 ° C (54°F) |
30.4 ° C (86.7°F) |
20.8 ° C (69.5°F) |
% 53 | 73% | 5 | Sunrise:05:00 AM Sunset: 08:48 PM |
Moonrise:11:29 PM Moonset: 06:16 AM Moon Phase ( Waning Gibbous ) |
|
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