| Point Forecast: 9NM NNW Evanston IL 42.19N 87.77W |
Last Update: 9:06 am CDT Aug 18, 2026 |
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| Date | 08/18 | 08/19 | ||||||||||||||||||||||
| Hour (CDT) | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 |
| Temperature (°C) | 22 | 24 | 26 | 26 | 27 | 26 | 27 | 27 | 26 | 25 | 24 | 23 | 23 | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 20 | 19 | 21 | 21 |
| Dewpoint (°C) | 18 | 18 | 18 | 18 | 19 | 19 | 19 | 19 | 20 | 20 | 20 | 20 | 20 | 21 | 21 | 20 | 20 | 20 | 19 | 19 | 19 | 19 | 19 | 19 |
| Heat Index (°C) | 24 | 26 | 26 | 28 | 27 | 28 | 28 | 26 | 25 | 24 | ||||||||||||||
| Surface Wind (km/h) | 16 | 18 | 18 | 21 | 21 | 23 | 23 | 23 | 21 | 18 | 16 | 14 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 13 | 13 | 11 | 10 | 10 |
| Wind Dir | WSW | WSW | WSW | WSW | WSW | WSW | WSW | WSW | WSW | WSW | WSW | WSW | WSW | WSW | WSW | W | W | WNW | WNW | WNW | NW | NNW | N | NNW |
| Gust | 29 | 32 | 35 | 34 | 34 | 34 | 32 | |||||||||||||||||
| Sky Cover (%) | 55 | 58 | 61 | 63 | 66 | 71 | 77 | 81 | 87 | 93 | 84 | 79 | 69 | 63 | 64 | 62 | 65 | 65 | 63 | 62 | 61 | 58 | 47 | 50 |
| Precipitation Potential (%) | 2 | 3 | 5 | 10 | 20 | 22 | 30 | 38 | 43 | 52 | 55 | 55 | 54 | 52 | 46 | 34 | 26 | 20 | 14 | 7 | 7 | 5 | 4 | 4 |
| Relative Humidity (%) | 74 | 68 | 65 | 64 | 61 | 64 | 63 | 65 | 70 | 73 | 78 | 83 | 86 | 90 | 91 | 92 | 92 | 93 | 93 | 90 | 94 | 96 | 92 | 94 |
| Rain | -- | -- | -- | -- | SChc | SChc | Chc | Chc | Chc | Chc | Lkly | Lkly | Chc | Chc | Chc | Chc | Chc | SChc | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | SChc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- |
| Wave Height (m) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Wave Period (sec) | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 |
| Wave Direction (°) | 130 | 100 | 250 | 240 | 240 | 250 | 240 | 240 | 240 | 250 | 250 | 250 | 250 | 250 | 260 | 270 | 280 | 290 | 300 | 310 | 320 | 330 | 340 | 350 |
| Date | 08/20 | |||||||||||||||||||||||
| Hour (CDT) | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 |
| Temperature (°C) | 21 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 21 | 21 | 21 | 20 | 20 | 19 | 19 | 19 | 19 | 19 | 20 |
| Dewpoint (°C) | 20 | 20 | 20 | 19 | 19 | 19 | 19 | 19 | 18 | 18 | 18 | 17 | 17 | 17 | 17 | 17 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 17 |
| Heat Index (°C) | ||||||||||||||||||||||||
| Surface Wind (km/h) | 10 | 11 | 11 | 11 | 11 | 11 | 13 | 14 | 14 | 13 | 13 | 13 | 11 | 10 | 10 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
| Wind Dir | N | N | NNE | NNE | NE | ENE | ENE | ENE | ENE | E | E | E | E | E | E | E | E | E | ENE | NE | NE | NNE | NNE | NNE |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 44 | 39 | 46 | 42 | 26 | 20 | 11 | 20 | 17 | 8 | 24 | 20 | 21 | 22 | 23 | 24 | 26 | 27 | 28 | 30 | 27 | 25 | 22 | 21 |
| Precipitation Potential (%) | 4 | 6 | 6 | 6 | 4 | 4 | 4 | 4 | 4 | 4 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 |
| Relative Humidity (%) | 92 | 90 | 89 | 87 | 84 | 85 | 84 | 84 | 82 | 80 | 79 | 78 | 76 | 75 | 77 | 78 | 79 | 79 | 79 | 80 | 81 | 82 | 82 | 80 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Wave Height (m) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Wave Period (sec) | 2 | 3 | 3 | 4 | 4 | 4 | 5 | 5 | 5 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Wave Direction (°) | 10 | 20 | 20 | 20 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 20 | 20 | 30 | 20 | 20 | 20 | 20 |
