| Point Forecast: Oak Forest IL 41.6N 87.75W |
Last Update: 9:16 am CDT May 17, 2026 |
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| Date | 05/17 | 05/18 | ||||||||||||||||||||||
| Hour (CDT) | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 |
| Temperature (°F) | 74 | 75 | 77 | 79 | 82 | 84 | 85 | 85 | 85 | 84 | 81 | 79 | 77 | 75 | 74 | 73 | 72 | 71 | 70 | 70 | 70 | 70 | 71 | 74 |
| Dewpoint (°F) | 64 | 65 | 65 | 66 | 65 | 64 | 63 | 62 | 62 | 62 | 62 | 62 | 62 | 62 | 62 | 61 | 61 | 60 | 58 | 58 | 58 | 59 | 59 | 61 |
| Heat Index (°F) | 75 | 77 | 81 | 83 | 85 | 86 | 86 | 85 | 84 | 82 | 79 | 77 | 75 | |||||||||||
| Surface Wind (mph) | 11 | 13 | 14 | 16 | 17 | 20 | 21 | 21 | 20 | 20 | 17 | 15 | 14 | 14 | 14 | 15 | 15 | 15 | 15 | 14 | 15 | 15 | 16 | 17 |
| Wind Dir | SSW | S | S | S | S | S | S | SSW | SSW | SSW | S | S | S | S | S | S | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SSW |
| Gust | 18 | 20 | 22 | 24 | 25 | 28 | 29 | 30 | 29 | 28 | 26 | 24 | 22 | 22 | 23 | 23 | 24 | 24 | 24 | 24 | 24 | 25 | 28 | 29 |
| Sky Cover (%) | 68 | 69 | 70 | 71 | 68 | 65 | 62 | 59 | 55 | 53 | 49 | 42 | 30 | 19 | 17 | 15 | 17 | 21 | 27 | 30 | 36 | 39 | 43 | 54 |
| Precipitation Potential (%) | 12 | 10 | 8 | 9 | 8 | 6 | 4 | 3 | 3 | 2 | 1 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 3 | 4 | 4 | 16 |
| Relative Humidity (%) | 73 | 70 | 67 | 63 | 57 | 51 | 48 | 47 | 47 | 49 | 52 | 56 | 59 | 63 | 66 | 67 | 68 | 68 | 66 | 66 | 68 | 68 | 66 | 64 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 05/19 | |||||||||||||||||||||||
| Hour (CDT) | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 |
| Temperature (°F) | 77 | 80 | 82 | 84 | 82 | 83 | 82 | 80 | 80 | 81 | 80 | 77 | 75 | 74 | 72 | 70 | 69 | 69 | 69 | 69 | 68 | 67 | 68 | 70 |
| Dewpoint (°F) | 63 | 65 | 66 | 67 | 68 | 68 | 69 | 69 | 68 | 68 | 67 | 67 | 67 | 66 | 66 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 66 |
| Heat Index (°F) | 77 | 81 | 84 | 87 | 85 | 86 | 86 | 83 | 83 | 84 | 82 | 77 | 75 | |||||||||||
| Surface Wind (mph) | 18 | 20 | 20 | 20 | 20 | 20 | 20 | 18 | 18 | 18 | 17 | 17 | 16 | 16 | 15 | 16 | 16 | 16 | 17 | 17 | 18 | 20 | 20 | 21 |
| Wind Dir | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SSW | S | S | SSW | SSW | SSW | S | S | S | SSW | SSW | SSW |
| Gust | 30 | 30 | 32 | 29 | 30 | 28 | 28 | 26 | 26 | 26 | 26 | 25 | 23 | 22 | 22 | 22 | 23 | 23 | 24 | 25 | 26 | 28 | 28 | 30 |
| Sky Cover (%) | 64 | 71 | 71 | 74 | 73 | 71 | 74 | 78 | 78 | 77 | 75 | 71 | 63 | 54 | 48 | 46 | 47 | 53 | 60 | 67 | 72 | 74 | 76 | 78 |
| Precipitation Potential (%) | 27 | 47 | 66 | 70 | 73 | 73 | 73 | 62 | 62 | 62 | 23 | 23 | 23 | 16 | 16 | 16 | 45 | 45 | 45 | 50 | 50 | 50 | 47 | 47 |
| Relative Humidity (%) | 62 | 61 | 59 | 57 | 61 | 60 | 64 | 68 | 67 | 65 | 66 | 71 | 75 | 78 | 81 | 84 | 86 | 87 | 87 | 88 | 90 | 92 | 91 | 85 |
| Rain | Chc | Chc | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | SChc | SChc | SChc | SChc | SChc | SChc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc |
| Thunder | SChc | SChc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc |
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