| Point Forecast: Seattle-Tacoma International Airport WA 47.46N 122.31W (Elev. 400 ft) |
Last Update: 11:26 pm PDT Sep 13, 2026 |
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| Date | 09/14 | 09/15 | ||||||||||||||||||||||
| Hour (PDT) | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 |
| Temperature (°F) | 55 | 57 | 58 | 60 | 61 | 63 | 65 | 66 | 66 | 68 | 66 | 64 | 62 | 60 | 59 | 58 | 57 | 56 | 56 | 55 | 54 | 54 | 54 | 53 |
| Dewpoint (°F) | 51 | 53 | 52 | 52 | 51 | 51 | 51 | 51 | 50 | 52 | 52 | 52 | 52 | 51 | 51 | 52 | 52 | 51 | 51 | 51 | 50 | 51 | 51 | 50 |
| Heat Index (°F) | ||||||||||||||||||||||||
| Surface Wind (mph) | 9 | 9 | 10 | 10 | 9 | 9 | 9 | 8 | 7 | 6 | 5 | 5 | 3 | 3 | 5 | 10 | 5 | 5 | 5 | 5 | 3 | 2 | 2 | 2 |
| Wind Dir | S | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SW | SSW | SSW | SSW | SSW | SSW | SSW | SW | WSW | W | NE | NNE | NNE | N | N | N |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 73 | 88 | 84 | 75 | 61 | 63 | 58 | 40 | 32 | 32 | 36 | 52 | 51 | 58 | 45 | 45 | 71 | 80 | 75 | 81 | 76 | 95 | 95 | 95 |
| Precipitation Potential (%) | 2 | 2 | 3 | 2 | 2 | 3 | 3 | 2 | 3 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 3 | 3 | 4 | 12 | 17 | 3 |
| Relative Humidity (%) | 86 | 85 | 79 | 74 | 69 | 66 | 61 | 59 | 56 | 56 | 60 | 66 | 70 | 73 | 76 | 79 | 82 | 83 | 84 | 87 | 87 | 88 | 88 | 88 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 09/16 | |||||||||||||||||||||||
| Hour (PDT) | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 |
| Temperature (°F) | 55 | 55 | 57 | 59 | 60 | 62 | 64 | 65 | 65 | 67 | 65 | 63 | 61 | 59 | 58 | 57 | 56 | 55 | 54 | 53 | 52 | 52 | 52 | 53 |
| Dewpoint (°F) | 51 | 51 | 51 | 52 | 52 | 52 | 52 | 53 | 51 | 53 | 53 | 52 | 52 | 52 | 52 | 51 | 51 | 50 | 50 | 50 | 49 | 49 | 49 | 49 |
| Heat Index (°F) | ||||||||||||||||||||||||
| Surface Wind (mph) | 5 | 5 | 5 | 7 | 7 | 7 | 9 | 9 | 9 | 10 | 10 | 10 | 8 | 8 | 8 | 11 | 11 | 11 | 7 | 7 | 7 | 6 | 6 | 6 |
| Wind Dir | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | NNE | NNE | NNE | NNE | NNE | NNE | NE | NE | NE |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 92 | 92 | 92 | 58 | 58 | 58 | 18 | 18 | 18 | 2 | 2 | 2 | 8 | 8 | 8 | 7 | 7 | 7 | 4 | 4 | 4 | 16 | 16 | 16 |
| Precipitation Potential (%) | 1 | 3 | 2 | 4 | 2 | 1 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Relative Humidity (%) | 86 | 86 | 81 | 77 | 74 | 71 | 66 | 64 | 61 | 61 | 64 | 68 | 73 | 76 | 79 | 81 | 83 | 85 | 86 | 88 | 89 | 90 | 90 | 88 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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