| Point Forecast: Mount St Helens WA 46.18N 122.18W (Elev. 6204 ft) |
Last Update: 11:41 am PDT May 18, 2024 |
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| Date | 05/18 | 05/19 | ||||||||||||||||||||||
| Hour (PDT) | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 |
| Temperature (°F) | 30 | 31 | 31 | 31 | 32 | 30 | 29 | 29 | 28 | 28 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 26 | 27 | 28 | 28 | 29 | 28 | 29 |
| Dewpoint (°F) | 24 | 26 | 26 | 26 | 29 | 26 | 27 | 26 | 25 | 25 | 24 | 23 | 24 | 23 | 22 | 22 | 22 | 20 | 22 | 22 | 22 | 23 | 23 | 24 |
| Heat Index (°F) | ||||||||||||||||||||||||
| Surface Wind (mph) | 5 | 17 | 17 | 18 | 21 | 25 | 26 | 31 | 25 | 23 | 25 | 23 | 23 | 23 | 20 | 20 | 20 | 17 | 17 | 17 | 15 | 15 | 15 | 14 |
| Wind Dir | NW | WNW | WNW | WNW | WNW | WNW | WNW | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW |
| Gust | 26 | 26 | 29 | 29 | 28 | 18 | 18 | 18 | 21 | |||||||||||||||
| Sky Cover (%) | 58 | 68 | 75 | 83 | 87 | 83 | 72 | 68 | 62 | 70 | 62 | 61 | 64 | 62 | 67 | 67 | 66 | 65 | 64 | 67 | 70 | 67 | 65 | 59 |
| Precipitation Potential (%) | 12 | 28 | 46 | 68 | 74 | 74 | 55 | 46 | 32 | 24 | 18 | 12 | 9 | 8 | 8 | 9 | 12 | 15 | 14 | 18 | 17 | 18 | 19 | 24 |
| Relative Humidity (%) | 77 | 80 | 82 | 83 | 87 | 86 | 94 | 88 | 88 | 87 | 87 | 84 | 88 | 86 | 81 | 82 | 82 | 79 | 82 | 79 | 78 | 79 | 82 | 83 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | SChc | SChc | SChc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 05/20 | |||||||||||||||||||||||
| Hour (PDT) | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 |
| Temperature (°F) | 31 | 32 | 33 | 34 | 34 | 34 | 33 | 33 | 32 | 32 | 31 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 31 | 32 | 33 | 35 | 37 |
| Dewpoint (°F) | 27 | 27 | 27 | 27 | 27 | 28 | 28 | 27 | 26 | 25 | 25 | 24 | 24 | 23 | 23 | 22 | 22 | 22 | 22 | 23 | 24 | 24 | 26 | 27 |
| Heat Index (°F) | ||||||||||||||||||||||||
| Surface Wind (mph) | 14 | 14 | 16 | 16 | 16 | 17 | 17 | 17 | 16 | 16 | 16 | 14 | 14 | 14 | 17 | 17 | 17 | 15 | 15 | 15 | 8 | 8 | 8 | 11 |
| Wind Dir | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | NNW | NNW | NNW | NNW | NNW | NNW | NW | NW | NW | WNW |
| Gust | 21 | 22 | 23 | 24 | 24 | 25 | 25 | 25 | 24 | 24 | 24 | |||||||||||||
| Sky Cover (%) | 58 | 61 | 67 | 63 | 61 | 52 | 52 | 52 | 54 | 54 | 54 | 30 | 30 | 30 | 23 | 23 | 23 | 32 | 32 | 32 | 31 | 31 | 31 | 17 |
| Precipitation Potential (%) | 35 | 42 | 51 | 45 | 41 | 6 | 6 | 6 | 6 | 6 | 6 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 |
| Relative Humidity (%) | 86 | 82 | 79 | 76 | 76 | 77 | 81 | 79 | 79 | 76 | 77 | 79 | 78 | 76 | 74 | 73 | 73 | 73 | 72 | 72 | 71 | 70 | 69 | 68 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
