| Point Forecast: Chicago Heights IL 41.51N 87.64W |
Last Update: 10:26 am CDT May 17, 2026 |
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| Date | 05/17 | 05/18 | ||||||||||||||||||||||
| 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) | 76 | 78 | 80 | 82 | 84 | 85 | 85 | 85 | 83 | 81 | 78 | 76 | 74 | 73 | 72 | 71 | 70 | 70 | 69 | 69 | 69 | 70 | 73 | 76 |
| Dewpoint (°F) | 65 | 66 | 65 | 65 | 63 | 63 | 62 | 62 | 62 | 62 | 61 | 61 | 61 | 61 | 60 | 60 | 59 | 58 | 58 | 58 | 58 | 59 | 60 | 62 |
| Heat Index (°F) | 76 | 78 | 82 | 84 | 85 | 86 | 86 | 85 | 84 | 82 | 78 | 76 | 76 | |||||||||||
| Surface Wind (mph) | 13 | 15 | 16 | 18 | 20 | 21 | 21 | 21 | 20 | 17 | 16 | 14 | 14 | 14 | 14 | 15 | 14 | 14 | 14 | 15 | 15 | 16 | 17 | 18 |
| Wind Dir | S | S | S | S | S | S | S | SSW | SSW | S | S | S | S | S | S | S | SSW | SSW | SSW | S | SSW | SSW | SSW | SSW |
| Gust | 21 | 23 | 24 | 26 | 28 | 30 | 30 | 29 | 28 | 28 | 24 | 22 | 22 | 22 | 23 | 23 | 23 | 23 | 23 | 24 | 25 | 28 | 29 | 30 |
| Sky Cover (%) | 65 | 66 | 66 | 66 | 64 | 61 | 59 | 60 | 60 | 47 | 40 | 29 | 17 | 16 | 13 | 15 | 19 | 24 | 29 | 33 | 36 | 39 | 50 | 60 |
| Precipitation Potential (%) | 7 | 6 | 6 | 5 | 5 | 4 | 2 | 2 | 2 | 1 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 3 | 3 | 14 | 24 |
| Relative Humidity (%) | 70 | 66 | 61 | 56 | 51 | 47 | 46 | 46 | 49 | 52 | 56 | 61 | 64 | 66 | 67 | 67 | 68 | 66 | 67 | 68 | 68 | 66 | 64 | 62 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 05/19 | |||||||||||||||||||||||
| 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) | 79 | 82 | 84 | 83 | 83 | 82 | 80 | 80 | 80 | 79 | 76 | 74 | 72 | 71 | 70 | 69 | 68 | 68 | 68 | 67 | 67 | 68 | 70 | 74 |
| Dewpoint (°F) | 64 | 66 | 67 | 68 | 68 | 68 | 68 | 68 | 68 | 68 | 67 | 67 | 66 | 66 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 66 | 67 |
| Heat Index (°F) | 81 | 84 | 86 | 86 | 86 | 85 | 83 | 82 | 82 | 79 | 76 | |||||||||||||
| Surface Wind (mph) | 18 | 20 | 20 | 20 | 20 | 18 | 18 | 18 | 18 | 17 | 16 | 15 | 15 | 15 | 15 | 15 | 16 | 16 | 17 | 18 | 18 | 20 | 21 | 21 |
| Wind Dir | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SSW | S | S | S | S | SSW | SSW | S | S | S | SSW | SSW | SSW | SSW |
| Gust | 30 | 30 | 29 | 30 | 28 | 28 | 26 | 26 | 26 | 25 | 24 | 22 | 21 | 21 | 21 | 22 | 23 | 23 | 25 | 26 | 26 | 28 | 29 | 30 |
| Sky Cover (%) | 67 | 68 | 73 | 73 | 70 | 74 | 79 | 79 | 78 | 76 | 71 | 62 | 53 | 48 | 46 | 46 | 51 | 57 | 64 | 68 | 71 | 73 | 76 | 79 |
| Precipitation Potential (%) | 45 | 66 | 71 | 74 | 74 | 74 | 64 | 64 | 64 | 23 | 23 | 23 | 15 | 15 | 15 | 43 | 43 | 43 | 46 | 46 | 46 | 45 | 45 | 45 |
| Relative Humidity (%) | 61 | 59 | 57 | 60 | 61 | 64 | 68 | 68 | 67 | 69 | 75 | 79 | 81 | 83 | 85 | 87 | 88 | 89 | 90 | 92 | 93 | 92 | 86 | 79 |
| Rain | Chc | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | SChc | SChc | SChc | SChc | SChc | SChc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc |
| Thunder | SChc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc |
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