| Point Forecast: Lake Forest IL 42.24N 87.86W |
Last Update: 2:46 pm CDT Aug 17, 2026 |
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| Date | 08/17 | 08/18 | ||||||||||||||||||||||
| Hour (CDT) | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 |
| Temperature (°F) | 75 | 76 | 75 | 75 | 73 | 71 | 70 | 68 | 67 | 67 | 66 | 65 | 64 | 64 | 63 | 64 | 65 | 68 | 73 | 76 | 78 | 79 | 79 | 80 |
| Dewpoint (°F) | 63 | 63 | 63 | 63 | 63 | 63 | 63 | 63 | 63 | 62 | 62 | 62 | 61 | 61 | 61 | 61 | 62 | 64 | 66 | 67 | 67 | 67 | 67 | 68 |
| Heat Index (°F) | 75 | 76 | 75 | 75 | 76 | 78 | 79 | 82 | 82 | |||||||||||||||
| Surface Wind (mph) | 7 | 7 | 6 | 5 | 3 | 3 | 3 | 3 | 3 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 6 | 7 | 8 | 10 | 11 | 13 | 13 |
| Wind Dir | NE | ENE | ENE | E | ESE | SSE | S | SSW | SW | SW | SW | WSW | WSW | WSW | WSW | WSW | WSW | WSW | WSW | WSW | WSW | WSW | WSW | WSW |
| Gust | 14 | 16 | 17 | 20 | 20 | |||||||||||||||||||
| Sky Cover (%) | 32 | 26 | 22 | 18 | 20 | 13 | 10 | 7 | 7 | 14 | 23 | 39 | 24 | 25 | 27 | 29 | 22 | 42 | 40 | 49 | 63 | 68 | 81 | 76 |
| Precipitation Potential (%) | 16 | 10 | 8 | 6 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 2 | 2 | 2 | 3 | 3 | 3 | 2 | 2 | 7 | 12 |
| Relative Humidity (%) | 67 | 65 | 65 | 66 | 71 | 76 | 80 | 84 | 85 | 86 | 87 | 89 | 90 | 90 | 93 | 90 | 91 | 87 | 78 | 73 | 68 | 66 | 67 | 67 |
| Rain | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 08/19 | |||||||||||||||||||||||
| Hour (CDT) | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 |
| Temperature (°F) | 79 | 78 | 77 | 75 | 73 | 72 | 71 | 70 | 69 | 68 | 68 | 67 | 66 | 66 | 65 | 64 | 66 | 68 | 70 | 72 | 74 | 74 | 74 | 75 |
| Dewpoint (°F) | 68 | 69 | 69 | 69 | 68 | 68 | 68 | 68 | 68 | 67 | 67 | 66 | 66 | 65 | 65 | 64 | 65 | 66 | 67 | 67 | 66 | 66 | 65 | 64 |
| Heat Index (°F) | 79 | 78 | 77 | 75 | 75 | |||||||||||||||||||
| Surface Wind (mph) | 11 | 11 | 10 | 9 | 8 | 7 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 3 | 3 | 5 | 5 | 5 | 5 | 5 | 6 | 6 |
| Wind Dir | W | WSW | WSW | WSW | WSW | SW | WSW | WSW | W | W | W | WNW | WNW | WNW | WNW | NW | NW | NNW | NNW | N | N | N | NNE | NNE |
| Gust | 20 | 18 | 16 | 15 | 13 | |||||||||||||||||||
| Sky Cover (%) | 63 | 66 | 66 | 77 | 75 | 68 | 57 | 62 | 64 | 65 | 56 | 50 | 52 | 41 | 46 | 48 | 35 | 44 | 46 | 48 | 47 | 46 | 45 | 44 |
| Precipitation Potential (%) | 27 | 34 | 39 | 41 | 64 | 64 | 64 | 64 | 64 | 64 | 27 | 27 | 27 | 27 | 27 | 27 | 4 | 4 | 4 | 4 | 4 | 4 | 2 | 2 |
| Relative Humidity (%) | 71 | 73 | 76 | 81 | 84 | 87 | 90 | 93 | 97 | 97 | 97 | 97 | 100 | 97 | 100 | 100 | 97 | 93 | 90 | 84 | 76 | 76 | 74 | 69 |
| Rain | Chc | Chc | Chc | Chc | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Chc | Chc | Chc | Chc | Chc | Chc | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | SChc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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