| Point Forecast: Grand Coulee WA 47.93N 118.99W (Elev. 621 m) |
Last Update: 4:16 pm PDT Jun 30, 2025 |
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| Date | 06/30 | 07/01 | ||||||||||||||||||||||
| Hour (PDT) | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| Temperature (°C) | 29 | 27 | 26 | 25 | 23 | 22 | 21 | 21 | 19 | 21 | 22 | 23 | 27 | 29 | 32 | 33 | 35 | 36 | 36 | 37 | 36 | 36 | 35 | 33 |
| Dewpoint (°C) | 5 | 5 | 4 | 5 | 5 | 5 | 6 | 6 | 6 | 7 | 7 | 7 | 8 | 7 | 6 | 5 | 4 | 4 | 3 | 4 | 3 | 4 | 4 | 5 |
| Heat Index (°C) | 27 | 26 | 26 | 25 | 26 | 28 | 29 | 31 | 32 | 33 | 33 | 34 | 33 | 33 | 32 | 31 | ||||||||
| Surface Wind (mph) | 5 | 5 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 2 | 3 | 5 | 5 | 6 | 6 | 7 | 8 | 8 | 9 | 9 | 8 | 7 | 7 |
| Wind Dir | S | S | S | S | SW | W | W | SW | SW | SW | NW | N | N | N | W | W | W | W | W | SW | SW | SW | W | W |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 3 | 8 | 7 | 9 | 11 | 7 | 7 | 11 | 15 | 25 | 7 | 5 | 4 | 3 | 3 | 4 | 18 | 30 | 25 | 22 | 17 | 19 | 16 | 29 |
| Precipitation Potential (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Relative Humidity (%) | 22 | 24 | 25 | 28 | 30 | 34 | 36 | 40 | 42 | 42 | 39 | 35 | 31 | 25 | 21 | 17 | 15 | 14 | 13 | 13 | 13 | 15 | 15 | 17 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 07/02 | |||||||||||||||||||||||
| Hour (PDT) | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| Temperature (°C) | 30 | 28 | 27 | 25 | 23 | 22 | 21 | 20 | 19 | 20 | 21 | 23 | 25 | 27 | 29 | 31 | 32 | 33 | 34 | 34 | 34 | 33 | 32 | 30 |
| Dewpoint (°C) | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 8 | 8 | 7 | 6 | 5 | 4 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Heat Index (°C) | 28 | 27 | 26 | 25 | 25 | 27 | 28 | 29 | 30 | 31 | 32 | 32 | 32 | 31 | 29 | 28 | ||||||||
| Surface Wind (mph) | 7 | 7 | 7 | 7 | 7 | 6 | 6 | 6 | 5 | 5 | 5 | 6 | 6 | 6 | 11 | 11 | 11 | 16 | 16 | 16 | 20 | 20 | 20 | 22 |
| Wind Dir | W | W | W | W | W | NW | NW | NW | NW | NW | NW | W | W | W | SW | SW | SW | SW | SW | SW | SW | SW | SW | W |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 19 | 25 | 18 | 18 | 18 | 30 | 30 | 30 | 37 | 37 | 37 | 20 | 20 | 20 | 21 | 21 | 21 | 20 | 20 | 20 | 14 | 14 | 14 | 22 |
| Precipitation Potential (%) | 0 | 0 | 2 | 2 | 2 | 2 | 2 | 2 | 17 | 17 | 17 | 9 | 9 | 9 | 5 | 5 | 5 | 2 | 2 | 2 | 1 | 1 | 1 | 1 |
| Relative Humidity (%) | 23 | 25 | 28 | 31 | 34 | 37 | 41 | 44 | 46 | 45 | 43 | 39 | 34 | 28 | 23 | 19 | 17 | 15 | 14 | 14 | 14 | 15 | 16 | 18 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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