| Point Forecast: Mount St Helens WA 46.18N 122.18W (Elev. 1891 m) |
Last Update: 4:46 am PDT Jul 15, 2025 |
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| Date | 07/15 | 07/16 | ||||||||||||||||||||||
| Hour (PDT) | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 |
| Temperature (°C) | 9 | 9 | 12 | 12 | 13 | 14 | 16 | 17 | 17 | 18 | 18 | 18 | 19 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 13 | 13 | 12 | 12 |
| Dewpoint (°C) | 1 | 1 | 2 | 2 | 3 | 4 | 4 | 6 | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 5 | 4 | 3 | 1 | -1 | -1 | -1 | -2 | -2 |
| Heat Index (°C) | ||||||||||||||||||||||||
| Surface Wind (mph) | 10 | 9 | 8 | 7 | 6 | 5 | 3 | 3 | 3 | 3 | 5 | 6 | 6 | 6 | 6 | 7 | 8 | 9 | 10 | 11 | 14 | 14 | 15 | 15 |
| Wind Dir | ENE | NE | ENE | E | E | E | E | E | E | E | ENE | ENE | ENE | ENE | NE | ENE | NNE | NE | ENE | NE | ENE | E | NNE | NNE |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 5 | 10 | 6 | 1 | 1 | 1 | 1 | 3 | 8 | 7 | 11 | 4 | 5 | 6 | 7 | 10 | 6 | 5 | 6 | 7 | 7 | 4 | 3 | 4 |
| 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 (%) | 56 | 55 | 50 | 51 | 51 | 49 | 48 | 50 | 49 | 47 | 45 | 45 | 42 | 44 | 45 | 44 | 46 | 43 | 41 | 39 | 39 | 39 | 38 | 38 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 07/17 | |||||||||||||||||||||||
| Hour (PDT) | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 |
| Temperature (°C) | 12 | 13 | 14 | 15 | 17 | 17 | 17 | 18 | 19 | 19 | 19 | 19 | 19 | 19 | 18 | 18 | 17 | 16 | 14 | 14 | 13 | 12 | 12 | 11 |
| Dewpoint (°C) | -2 | -2 | -2 | -1 | 1 | 1 | 2 | 3 | 4 | 6 | 6 | 7 | 7 | 6 | 5 | 4 | 4 | 3 | 2 | 2 | 1 | 1 | 0 | -1 |
| Heat Index (°C) | ||||||||||||||||||||||||
| Surface Wind (mph) | 15 | 14 | 11 | 10 | 8 | 7 | 5 | 5 | 5 | 5 | 5 | 5 | 8 | 8 | 8 | 8 | 8 | 8 | 6 | 6 | 6 | 5 | 5 | 5 |
| Wind Dir | NNE | N | ENE | E | ESE | SSE | S | S | S | WSW | WSW | WSW | WNW | WNW | WNW | WNW | WNW | WNW | WNW | WNW | WNW | W | W | W |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 5 | 10 | 7 | 1 | 2 | 3 | 3 | 3 | 3 | 5 | 5 | 5 | 4 | 4 | 4 | 9 | 9 | 9 | 8 | 8 | 8 | 3 | 3 | 3 |
| 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 (%) | 38 | 35 | 34 | 34 | 33 | 34 | 37 | 38 | 39 | 40 | 41 | 43 | 44 | 43 | 42 | 41 | 42 | 42 | 43 | 44 | 44 | 45 | 45 | 46 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
