| Point Forecast: 4 Miles NE Chicago IL 41.88N 87.65W |
Last Update: 9:51 pm CDT May 18, 2026 |
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| Date | 05/19 | 05/20 | ||||||||||||||||||||||
| Hour (CDT) | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 |
| Temperature (°F) | 66 | 66 | 66 | 66 | 65 | 65 | 66 | 66 | 69 | 72 | 75 | 77 | 78 | 79 | 77 | 76 | 75 | 74 | 71 | 68 | 66 | 64 | 61 | 59 |
| Dewpoint (°F) | 63 | 63 | 63 | 63 | 63 | 63 | 63 | 64 | 64 | 65 | 65 | 65 | 65 | 65 | 65 | 64 | 62 | 60 | 58 | 57 | 54 | 53 | 51 | 50 |
| Heat Index (°F) | 75 | 77 | 78 | 79 | 77 | 76 | 75 | |||||||||||||||||
| Surface Wind (mph) | 14 | 14 | 15 | 15 | 15 | 16 | 17 | 17 | 18 | 18 | 18 | 18 | 18 | 17 | 16 | 16 | 15 | 14 | 11 | 11 | 10 | 11 | 11 | 11 |
| Wind Dir | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SW | SW | SW | WSW | WSW | WSW | W | WNW | WNW | WNW | NW | NW | NW | NNW | NNW |
| Gust | 22 | 22 | 23 | 23 | 23 | 25 | 29 | 28 | 29 | 29 | 29 | 28 | 28 | 28 | 25 | 23 | 22 | 20 | 18 | 17 | 17 | 17 | 17 | 18 |
| Sky Cover (%) | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 85 | 70 | 76 | 81 | 82 | 82 | 77 | 72 | 70 | 68 | 59 | 50 |
| Precipitation Potential (%) | 6 | 15 | 23 | 33 | 37 | 28 | 20 | 22 | 17 | 20 | 20 | 22 | 29 | 28 | 27 | 24 | 21 | 18 | 12 | 12 | 12 | 7 | 7 | 7 |
| Relative Humidity (%) | 88 | 88 | 88 | 91 | 93 | 94 | 92 | 91 | 85 | 77 | 71 | 66 | 63 | 63 | 65 | 65 | 63 | 61 | 64 | 67 | 65 | 66 | 70 | 72 |
| Rain | -- | SChc | SChc | Chc | Chc | Chc | SChc | SChc | SChc | SChc | SChc | SChc | Chc | Chc | Chc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | SChc | SChc | SChc | -- | -- | -- | SChc | SChc | SChc | Chc | Chc | Chc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- |
| Date | 05/21 | |||||||||||||||||||||||
| Hour (CDT) | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 |
| Temperature (°F) | 57 | 56 | 54 | 52 | 51 | 50 | 50 | 53 | 53 | 55 | 55 | 55 | 54 | 54 | 54 | 54 | 53 | 51 | 50 | 50 | 50 | 50 | 50 | 50 |
| Dewpoint (°F) | 48 | 46 | 45 | 44 | 43 | 43 | 42 | 42 | 41 | 42 | 41 | 40 | 40 | 39 | 38 | 38 | 37 | 37 | 37 | 37 | 38 | 38 | 39 | 40 |
| Heat Index (°F) | ||||||||||||||||||||||||
| Surface Wind (mph) | 11 | 11 | 11 | 11 | 13 | 13 | 13 | 13 | 13 | 13 | 14 | 14 | 14 | 14 | 14 | 15 | 15 | 15 | 14 | 14 | 11 | 11 | 10 | 9 |
| Wind Dir | NNW | NNW | NNW | N | N | N | NNE | NNE | NNE | NNE | NNE | NNE | NNE | NNE | NNE | NNE | NNE | NNE | NNE | NNE | NNE | NNE | NNE | NNE |
| Gust | 18 | 18 | 18 | 20 | 20 | 20 | 18 | 20 | 20 | 20 | 20 | 20 | 20 | 21 | 21 | 21 | 21 | 21 | 21 | 20 | 20 | 18 | 17 | 16 |
| Sky Cover (%) | 44 | 38 | 44 | 50 | 52 | 55 | 48 | 41 | 48 | 55 | 50 | 44 | 39 | 38 | 38 | 37 | 37 | 38 | 38 | 42 | 46 | 50 | 48 | 45 |
| 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 (%) | 72 | 71 | 71 | 73 | 75 | 76 | 75 | 66 | 63 | 61 | 59 | 58 | 57 | 56 | 54 | 54 | 56 | 58 | 61 | 62 | 62 | 63 | 65 | 68 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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