| Point Forecast: Chicago/Romeoville, Lewis University Airport IL 41.61N 88.1W |
Last Update: 1:21 pm CDT Sep 11, 2026 |
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| Date | 09/11 | 09/12 | ||||||||||||||||||||||
| Hour (CDT) | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 |
| Temperature (°C) | 27 | 27 | 27 | 27 | 26 | 25 | 23 | 22 | 21 | 20 | 20 | 19 | 19 | 19 | 18 | 18 | 18 | 19 | 21 | 23 | 24 | 26 | 28 | 29 |
| Dewpoint (°C) | 14 | 14 | 14 | 15 | 16 | 16 | 16 | 17 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 19 | 20 | 21 | 22 | 22 | 22 | 21 |
| Heat Index (°C) | 27 | 27 | 27 | 27 | 26 | 25 | 24 | 28 | 31 | 31 | ||||||||||||||
| Surface Wind (mph) | 9 | 8 | 8 | 8 | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 7 | 8 | 9 | 10 | 11 | 11 |
| Wind Dir | SE | SE | SSE | SSE | SSE | ESE | ESE | ESE | SE | SSE | SSE | SSE | SSE | S | S | S | S | S | SSW | SW | SW | WSW | WSW | WSW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 23 | 28 | 28 | 29 | 32 | 36 | 37 | 36 | 35 | 34 | 35 | 38 | 42 | 45 | 46 | 48 | 51 | 47 | 44 | 43 | 40 | 39 | 40 | 45 |
| Precipitation Potential (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 3 | 6 | 8 | 9 | 9 |
| Relative Humidity (%) | 46 | 46 | 46 | 49 | 52 | 57 | 67 | 75 | 82 | 87 | 89 | 93 | 95 | 98 | 100 | 100 | 100 | 100 | 94 | 90 | 84 | 76 | 69 | 65 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 09/13 | |||||||||||||||||||||||
| Hour (CDT) | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 |
| Temperature (°C) | 29 | 29 | 29 | 29 | 28 | 26 | 24 | 24 | 23 | 22 | 22 | 21 | 20 | 19 | 18 | 18 | 17 | 17 | 18 | 20 | 22 | 23 | 24 | 24 |
| Dewpoint (°C) | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 20 | 19 | 18 | 17 | 16 | 14 | 13 | 13 | 12 | 12 | 13 | 14 | 14 | 14 | 14 | 13 |
| Heat Index (°C) | 32 | 32 | 32 | 31 | 31 | 26 | 24 | 24 | 24 | 24 | ||||||||||||||
| Surface Wind (mph) | 11 | 11 | 13 | 11 | 9 | 7 | 6 | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 6 | 6 | 7 | 7 | 7 | 8 |
| Wind Dir | W | W | W | WNW | WNW | WNW | NW | NW | NNW | NNW | NNW | NNW | NNW | N | N | N | N | N | N | N | N | N | N | N |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 48 | 42 | 39 | 36 | 36 | 39 | 45 | 51 | 48 | 43 | 38 | 34 | 34 | 35 | 34 | 32 | 29 | 28 | 28 | 32 | 38 | 44 | 49 | 55 |
| Precipitation Potential (%) | 8 | 7 | 6 | 6 | 5 | 4 | 3 | 2 | 2 | 2 | 3 | 4 | 4 | 5 | 5 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 26 |
| Relative Humidity (%) | 63 | 61 | 62 | 64 | 67 | 74 | 80 | 80 | 83 | 82 | 81 | 80 | 77 | 74 | 73 | 72 | 72 | 71 | 72 | 66 | 61 | 56 | 52 | 50 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | Chc |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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