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| Point Forecast: Mount St Helens WA 46.2N 122.18W (Elev. 5997 ft) |
Last Update: 10:02 am PDT May 16, 2021 |
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| Date | 05/16 | 05/17 | ||||||||||||||||||||||
| 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 (°F) | 51 | 52 | 53 | 53 | 53 | 53 | 53 | 52 | 51 | 50 | 49 | 48 | 48 | 47 | 46 | 46 | 45 | 44 | 42 | 41 | 40 | 40 | 40 | 41 |
| Dewpoint (°F) | 28 | 27 | 28 | 30 | 33 | 35 | 36 | 37 | 37 | 37 | 37 | 36 | 37 | 37 | 36 | 37 | 36 | 34 | 28 | 27 | 29 | 32 | 34 | 34 |
| Wind Chill (°F) | 46 | 46 | 44 | 44 | 42 | 41 | 41 | 40 | 39 | 36 | 35 | 34 | 34 | 34 | 35 | |||||||||
| Surface Wind (mph) | 7 | 5 | 5 | 5 | 8 | 8 | 8 | 11 | 11 | 11 | 8 | 8 | 8 | 10 | 10 | 10 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 |
| Wind Dir | NNW | WNW | WNW | WNW | WNW | WNW | WNW | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | WNW | WNW | WNW | WNW | WNW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 8 | 11 | 11 | 11 | 12 | 12 | 12 | 17 | 17 | 17 | 20 | 20 | 20 | 26 | 26 | 26 | 26 | 26 | 26 | 41 | 41 | 41 | 30 | 30 |
| Precipitation Potential (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Relative Humidity (%) | 40 | 37 | 38 | 41 | 46 | 50 | 53 | 56 | 59 | 61 | 62 | 64 | 65 | 67 | 68 | 70 | 70 | 68 | 57 | 58 | 65 | 74 | 79 | 76 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Snow | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Freezing Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Sleet | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 05/18 | |||||||||||||||||||||||
| 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 (°F) | 42 | 43 | 43 | 44 | 44 | 44 | 43 | 42 | 41 | 41 | 40 | 39 | 38 | 38 | 37 | 37 | 36 | 36 | 35 | 34 | 33 | 33 | 33 | 33 |
| Dewpoint (°F) | 33 | 30 | 28 | 29 | 29 | 31 | 31 | 32 | 32 | 33 | 33 | 33 | 33 | 34 | 33 | 34 | 33 | 32 | 30 | 28 | 28 | 28 | 29 | 28 |
| Wind Chill (°F) | 36 | 38 | 38 | 39 | 38 | 38 | 37 | 34 | 33 | 33 | 32 | 30 | 29 | 30 | 28 | 28 | 26 | 26 | 25 | 24 | 23 | 23 | 24 | 24 |
| Surface Wind (mph) | 9 | 9 | 9 | 9 | 11 | 11 | 11 | 16 | 16 | 16 | 16 | 16 | 16 | 14 | 14 | 14 | 16 | 16 | 16 | 15 | 15 | 15 | 11 | 11 |
| Wind Dir | WNW | W | W | W | W | W | W | W | W | W | W | W | W | W | W | W | WSW | WSW | WSW | W | W | W | W | W |
| Gust | 28 | 28 | 28 | 28 | 28 | 28 | 21 | 21 | 21 | 28 | 28 | 28 | 25 | 25 | 25 | |||||||||
| Sky Cover (%) | 30 | 42 | 42 | 42 | 80 | 80 | 80 | 86 | 86 | 86 | 86 | 86 | 86 | 95 | 95 | 95 | 95 | 95 | 95 | 95 | 95 | 95 | 95 | 95 |
| Precipitation Potential (%) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 31 | 31 | 31 | 31 | 31 | 31 | 68 | 68 | 68 | 68 | 68 | 68 | 64 | 64 | 64 | 64 | 64 |
| Relative Humidity (%) | 69 | 61 | 56 | 55 | 56 | 59 | 63 | 67 | 70 | 72 | 75 | 78 | 82 | 85 | 87 | 88 | 87 | 84 | 81 | 79 | 81 | 83 | 84 | 83 |
| Rain | -- | -- | -- | -- | -- | -- | -- | Chc | Chc | Chc | Chc | Chc | Chc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Snow | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly |
| Freezing Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Sleet | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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