| Point Forecast: Portland International Airport OR 45.58N 122.59W (Elev. 61 m) |
Last Update: 11:27 pm PDT Sep 7, 2026 |
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| Date | 09/07 | 09/08 | ||||||||||||||||||||||
| Hour (PDT) | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 |
| Temperature (°C) | 16 | 15 | 14 | 14 | 13 | 13 | 13 | 12 | 12 | 13 | 14 | 17 | 19 | 21 | 23 | 26 | 26 | 27 | 27 | 26 | 24 | 23 | 21 | 19 |
| Dewpoint (°C) | 13 | 13 | 13 | 13 | 12 | 12 | 12 | 11 | 11 | 12 | 12 | 13 | 13 | 14 | 13 | 14 | 13 | 13 | 14 | 14 | 14 | 15 | 13 | 13 |
| Heat Index (°C) | 26 | 26 | 27 | 27 | 26 | 24 | ||||||||||||||||||
| Surface Wind (mph) | 3 | 3 | 3 | 3 | 2 | 2 | 3 | 3 | 3 | 3 | 5 | 5 | 5 | 5 | 6 | 6 | 7 | 7 | 8 | 7 | 6 | 6 | 5 | 5 |
| Wind Dir | NW | NW | NW | NW | NW | NNW | NW | NW | NW | NNW | NNW | NNW | NNW | NNW | NNW | NNW | NNW | NNW | NNW | NNW | NNW | NNW | NNW | NNW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 4 | 4 | 3 | 1 | 3 | 9 | 14 | 25 | 34 | 27 | 19 | 10 | 6 | 9 | 8 | 6 | 6 | 4 | 2 | 2 | 5 | 9 | 10 | 8 |
| 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 (%) | 85 | 88 | 89 | 92 | 92 | 92 | 93 | 93 | 93 | 91 | 85 | 78 | 69 | 63 | 54 | 49 | 45 | 44 | 45 | 47 | 52 | 59 | 63 | 67 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 09/09 | |||||||||||||||||||||||
| Hour (PDT) | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 |
| Temperature (°C) | 18 | 17 | 16 | 15 | 14 | 14 | 13 | 13 | 13 | 14 | 16 | 19 | 21 | 23 | 26 | 28 | 28 | 29 | 29 | 28 | 27 | 24 | 23 | 21 |
| Dewpoint (°C) | 12 | 13 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 13 | 13 | 13 | 13 | 14 | 13 | 13 | 13 | 13 | 14 | 14 | 14 | 14 |
| Heat Index (°C) | 26 | 28 | 28 | 29 | 29 | 28 | 27 | 24 | ||||||||||||||||
| Surface Wind (mph) | 5 | 5 | 5 | 5 | 5 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 5 | 5 | 5 | 5 | 5 | 5 | 2 | 2 | 2 |
| Wind Dir | NW | NW | NW | NW | NW | NW | NNW | NNW | NNW | N | N | N | NNW | NNW | NNW | NNW | NNW | NNW | NNW | NNW | NNW | NNW | NNW | NNW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 6 | 7 | 4 | 3 | 6 | 4 | 16 | 16 | 16 | 16 | 16 | 16 | 13 | 13 | 13 | 7 | 7 | 7 | 9 | 9 | 9 | 10 | 10 | 10 |
| 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 (%) | 71 | 75 | 77 | 80 | 80 | 81 | 82 | 83 | 83 | 81 | 75 | 68 | 60 | 53 | 47 | 42 | 38 | 37 | 37 | 40 | 46 | 53 | 59 | 65 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
