| Point Forecast: 9NM NNW Evanston IL 42.19N 87.77W |
Last Update: 11:21 pm CDT Aug 16, 2026 |
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| Date | 08/17 | |||||||||||||||||||||||
| Hour (CDT) | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 |
| Temperature (°F) | 73 | 72 | 72 | 71 | 70 | 70 | 70 | 70 | 71 | 72 | 73 | 74 | 74 | 74 | 75 | 75 | 75 | 75 | 75 | 74 | 73 | 72 | 71 | 70 |
| Dewpoint (°F) | 66 | 66 | 66 | 66 | 66 | 65 | 65 | 65 | 66 | 66 | 66 | 65 | 65 | 65 | 64 | 64 | 64 | 64 | 63 | 64 | 64 | 64 | 64 | 64 |
| Heat Index (°F) | 75 | 75 | 75 | 75 | 75 | |||||||||||||||||||
| Surface Wind (mph) | 10 | 10 | 10 | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 4 | 4 | 5 | 5 | 6 |
| Wind Dir | N | N | N | N | N | N | N | N | N | NNE | NNE | NNE | NNE | NE | NE | NE | NE | ENE | E | ESE | SSE | S | SSW | SSW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 53 | 47 | 44 | 50 | 51 | 55 | 57 | 57 | 57 | 57 | 55 | 51 | 46 | 40 | 34 | 33 | 31 | 26 | 26 | 23 | 19 | 16 | 16 | 14 |
| Precipitation Potential (%) | 1 | 2 | 2 | 4 | 5 | 5 | 4 | 7 | 10 | 10 | 10 | 9 | 7 | 6 | 4 | 4 | 3 | 2 | 1 | 0 | 0 | 0 | 0 | 0 |
| Relative Humidity (%) | 79 | 81 | 82 | 83 | 86 | 85 | 85 | 86 | 85 | 81 | 78 | 76 | 74 | 72 | 71 | 70 | 68 | 68 | 68 | 70 | 74 | 77 | 79 | 80 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Wave Height (ft) | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Wave Period (sec) | 2 | 3 | 3 | 3 | 4 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 4 | 4 | 5 | 5 | 5 | 5 |
| Wave Direction (°) | 350 | 150 | 10 | 20 | 20 | 30 | 30 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 30 | 30 | 30 | 30 | 30 |
| Date | 08/18 | |||||||||||||||||||||||
| Hour (CDT) | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 |
| Temperature (°F) | 70 | 69 | 69 | 68 | 68 | 68 | 67 | 68 | 69 | 71 | 74 | 76 | 77 | 78 | 79 | 79 | 78 | 78 | 77 | 76 | 75 | 73 | 72 | 71 |
| Dewpoint (°F) | 64 | 64 | 64 | 63 | 63 | 63 | 63 | 64 | 66 | 68 | 68 | 69 | 69 | 69 | 70 | 70 | 71 | 71 | 71 | 71 | 71 | 70 | 70 | 69 |
| Heat Index (°F) | 76 | 77 | 78 | 79 | 79 | 79 | 78 | 77 | 76 | 75 | ||||||||||||||
| Surface Wind (mph) | 6 | 7 | 7 | 7 | 7 | 7 | 7 | 6 | 6 | 7 | 8 | 9 | 10 | 10 | 10 | 10 | 10 | 9 | 8 | 8 | 7 | 6 | 6 | 6 |
| Wind Dir | SW | SW | SW | WSW | WSW | WSW | WSW | SW | SW | WSW | WSW | WSW | WSW | WSW | WSW | W | W | W | W | W | W | W | W | W |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 14 | 15 | 17 | 19 | 25 | 30 | 33 | 45 | 32 | 32 | 32 | 36 | 40 | 44 | 48 | 52 | 56 | 62 | 67 | 73 | 73 | 74 | 74 | 77 |
| Precipitation Potential (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 41 | 41 | 41 | 41 | 41 | 41 | 67 | 67 | 67 | 67 | 67 |
| Relative Humidity (%) | 82 | 83 | 83 | 83 | 85 | 86 | 86 | 89 | 91 | 88 | 83 | 79 | 76 | 74 | 74 | 75 | 77 | 79 | 82 | 85 | 88 | 91 | 93 | 94 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | Chc | Chc | Chc | Chc | Chc | Chc | Lkly | Lkly | Lkly | Lkly | Lkly |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc | Chc | Chc |
| 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) | 5 | 5 | 5 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 2 | 1 | 2 |
| Wave Direction (°) | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 130 | 300 | 250 | 250 | 260 | 260 | 270 | 270 | 270 | 280 | 280 | 290 | 320 |
