| Point Forecast: Grand Coulee WA 47.93N 118.99W (Elev. 621 m) |
Last Update: 10:15 am PDT Jul 13, 2025 |
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| Date | 07/13 | 07/14 | ||||||||||||||||||||||
| Hour (PDT) | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 |
| Temperature (°C) | 30 | 32 | 33 | 35 | 37 | 37 | 37 | 38 | 37 | 36 | 34 | 31 | 29 | 28 | 27 | 26 | 24 | 23 | 22 | 22 | 22 | 23 | 24 | 26 |
| Dewpoint (°C) | 13 | 12 | 11 | 10 | 10 | 9 | 9 | 10 | 10 | 11 | 11 | 9 | 9 | 11 | 11 | 11 | 11 | 11 | 11 | 12 | 12 | 12 | 12 | 12 |
| Heat Index (°C) | 29 | 31 | 32 | 33 | 35 | 36 | 36 | 36 | 36 | 34 | 33 | 29 | 28 | 27 | 27 | 26 | 24 | 24 | 26 | |||||
| Surface Wind (mph) | 7 | 8 | 9 | 10 | 11 | 13 | 14 | 14 | 14 | 17 | 20 | 18 | 17 | 16 | 15 | 14 | 14 | 13 | 10 | 10 | 10 | 11 | 13 | 14 |
| Wind Dir | NW | W | W | W | W | W | W | W | W | NW | NW | W | W | W | W | W | W | W | W | NW | NW | NW | NW | NW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 25 | 16 | 2 | 7 | 4 | 4 | 4 | 12 | 9 | 6 | 9 | 5 | 12 | 12 | 10 | 12 | 11 | 14 | 11 | 9 | 19 | 6 | 1 | 2 |
| Precipitation Potential (%) | 1 | 0 | 0 | 0 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 |
| Relative Humidity (%) | 35 | 30 | 25 | 22 | 20 | 18 | 18 | 19 | 19 | 21 | 23 | 27 | 30 | 34 | 36 | 40 | 43 | 47 | 50 | 54 | 54 | 51 | 46 | 42 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 07/15 | |||||||||||||||||||||||
| Hour (PDT) | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 |
| Temperature (°C) | 28 | 29 | 31 | 32 | 32 | 32 | 33 | 32 | 31 | 29 | 27 | 26 | 24 | 23 | 22 | 22 | 21 | 20 | 19 | 19 | 19 | 20 | 21 | 22 |
| Dewpoint (°C) | 12 | 12 | 11 | 10 | 9 | 8 | 8 | 8 | 8 | 8 | 9 | 9 | 9 | 9 | 10 | 11 | 10 | 10 | 10 | 9 | 10 | 9 | 9 | 9 |
| Heat Index (°C) | 28 | 28 | 29 | 30 | 31 | 31 | 31 | 31 | 29 | 28 | 27 | 26 | 24 | |||||||||||
| Surface Wind (mph) | 15 | 16 | 16 | 16 | 17 | 17 | 17 | 28 | 28 | 28 | 26 | 26 | 26 | 17 | 17 | 17 | 16 | 16 | 16 | 14 | 14 | 14 | 16 | 16 |
| Wind Dir | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | N | N | N | N | N | N | N | N | N | N | N | N | NE | NE |
| Gust | 45 | 45 | 45 | 43 | 43 | 43 | ||||||||||||||||||
| Sky Cover (%) | 5 | 8 | 8 | 8 | 7 | 7 | 7 | 10 | 10 | 10 | 23 | 23 | 23 | 20 | 20 | 20 | 18 | 18 | 18 | 17 | 17 | 17 | 17 | 17 |
| Precipitation Potential (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 5 | 5 | 5 | 5 | 5 | 5 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
| Relative Humidity (%) | 37 | 33 | 29 | 26 | 24 | 23 | 22 | 23 | 25 | 28 | 31 | 35 | 38 | 42 | 45 | 49 | 51 | 53 | 55 | 55 | 54 | 51 | 48 | 45 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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