| Point Forecast: 9NM NNW Evanston IL 42.19N 87.77W |
Last Update: 9:55 am CDT Aug 19, 2026 |
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| Date | 08/19 | 08/20 | ||||||||||||||||||||||
| Hour (CDT) | 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) | 71 | 72 | 72 | 73 | 72 | 73 | 73 | 73 | 73 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 71 | 70 | 70 | 69 | 70 | 70 | 70 | 72 |
| Dewpoint (°F) | 64 | 66 | 66 | 66 | 66 | 66 | 65 | 64 | 63 | 61 | 62 | 61 | 60 | 59 | 59 | 58 | 58 | 58 | 58 | 58 | 58 | 59 | 59 | 59 |
| Heat Index (°F) | ||||||||||||||||||||||||
| Surface Wind (mph) | 5 | 5 | 6 | 7 | 8 | 8 | 9 | 8 | 8 | 8 | 6 | 6 | 6 | 5 | 7 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 5 | 4 |
| Wind Dir | N | NNE | NNE | NNE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NNE | NNE | NNE | NNE | NNE | NNE | NNE | NE | NE | NE |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 53 | 54 | 61 | 63 | 54 | 52 | 48 | 52 | 60 | 62 | 56 | 52 | 44 | 49 | 54 | 58 | 55 | 52 | 49 | 35 | 21 | 8 | 7 | 5 |
| Precipitation Potential (%) | 1 | 1 | 2 | 11 | 10 | 10 | 11 | 7 | 4 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Relative Humidity (%) | 81 | 83 | 81 | 79 | 81 | 78 | 76 | 74 | 71 | 68 | 71 | 70 | 67 | 65 | 63 | 62 | 63 | 64 | 65 | 67 | 66 | 66 | 70 | 65 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Wave Height (ft) | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 |
| Wave Period (sec) | 1 | 2 | 2 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 3 | 3 | 3 |
| Wave Direction (°) | 0 | 0 | 10 | 20 | 20 | 20 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 20 | 20 | 20 | 20 | 30 | 40 | 40 |
| Date | 08/21 | |||||||||||||||||||||||
| Hour (CDT) | 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) | 73 | 73 | 74 | 74 | 74 | 74 | 75 | 75 | 75 | 74 | 73 | 72 | 71 | 70 | 69 | 68 | 67 | 67 | 66 | 66 | 66 | 66 | 68 | 71 |
| Dewpoint (°F) | 59 | 58 | 58 | 57 | 57 | 57 | 57 | 57 | 57 | 58 | 58 | 59 | 60 | 61 | 61 | 62 | 62 | 61 | 61 | 61 | 62 | 62 | 64 | 65 |
| Heat Index (°F) | 75 | 75 | 75 | |||||||||||||||||||||
| Surface Wind (mph) | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 5 | 5 | 5 | 5 | 4 | 4 | 4 | 4 | 4 | 5 | 5 | 5 | 5 | 5 | 6 | 6 |
| Wind Dir | ENE | ENE | ENE | ENE | ENE | ENE | E | ENE | ENE | E | E | SE | S | S | S | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SSW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 4 | 4 | 3 | 2 | 2 | 1 | 3 | 3 | 12 | 18 | 0 | 10 | 20 | 22 | 24 | 26 | 32 | 38 | 44 | 42 | 41 | 40 | 44 | 48 |
| Precipitation Potential (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 4 | 4 | 4 | 4 | 4 | 4 | 15 | 15 | 15 |
| Relative Humidity (%) | 61 | 59 | 58 | 56 | 56 | 54 | 54 | 54 | 54 | 57 | 60 | 64 | 68 | 72 | 77 | 81 | 82 | 83 | 83 | 85 | 87 | 86 | 84 | 82 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc |
| Wave Height (ft) | 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 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Wave Direction (°) | 40 | 40 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 60 | 70 | 90 | 120 | 130 | 130 | 140 |
