| Point Forecast: 3 Miles ENE Mount Vernon IL 38.33N 88.86W |
Last Update: 1:26 am CDT May 17, 2026 |
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| Date | 05/17 | 05/18 | ||||||||||||||||||||||
| Hour (CDT) | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 |
| Temperature (°F) | 69 | 68 | 68 | 69 | 72 | 74 | 79 | 82 | 83 | 84 | 87 | 87 | 87 | 88 | 86 | 84 | 82 | 78 | 76 | 75 | 74 | 73 | 73 | 71 |
| Dewpoint (°F) | 64 | 63 | 63 | 63 | 64 | 64 | 65 | 65 | 65 | 65 | 64 | 64 | 63 | 62 | 62 | 59 | 57 | 56 | 55 | 55 | 55 | 55 | 56 | 57 |
| Heat Index (°F) | 79 | 84 | 85 | 86 | 88 | 88 | 88 | 88 | 86 | 84 | 82 | 78 | 76 | 75 | ||||||||||
| Surface Wind (mph) | 6 | 7 | 7 | 8 | 10 | 11 | 14 | 15 | 15 | 16 | 16 | 17 | 17 | 16 | 16 | 13 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 10 |
| Wind Dir | S | S | S | S | S | S | SSW | SSW | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S |
| Gust | 21 | 21 | 21 | 22 | 22 | 23 | 23 | 24 | 24 | 24 | 24 | 22 | 21 | 22 | 22 | 21 | 21 | 21 | 21 | 21 | ||||
| Sky Cover (%) | 73 | 71 | 52 | 23 | 29 | 22 | 24 | 30 | 25 | 16 | 16 | 15 | 17 | 1 | 1 | 2 | 1 | 0 | 1 | 8 | 12 | 11 | 19 | 33 |
| Precipitation Potential (%) | 2 | 2 | 1 | 3 | 3 | 3 | 3 | 2 | 1 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 3 | 4 | 5 |
| Relative Humidity (%) | 84 | 84 | 84 | 81 | 76 | 71 | 62 | 56 | 55 | 53 | 46 | 46 | 45 | 42 | 45 | 43 | 43 | 47 | 48 | 50 | 51 | 53 | 55 | 61 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 05/19 | |||||||||||||||||||||||
| Hour (CDT) | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 |
| Temperature (°F) | 71 | 71 | 70 | 71 | 74 | 76 | 80 | 82 | 83 | 84 | 84 | 85 | 85 | 85 | 86 | 83 | 82 | 80 | 78 | 77 | 76 | 75 | 74 | 74 |
| Dewpoint (°F) | 58 | 60 | 61 | 62 | 65 | 66 | 66 | 67 | 67 | 67 | 68 | 67 | 67 | 67 | 66 | 66 | 65 | 64 | 64 | 64 | 64 | 64 | 64 | 64 |
| Heat Index (°F) | 76 | 82 | 85 | 86 | 87 | 87 | 88 | 88 | 88 | 88 | 85 | 84 | 82 | 78 | 77 | 76 | 75 | |||||||
| Surface Wind (mph) | 10 | 11 | 13 | 13 | 14 | 16 | 17 | 18 | 18 | 18 | 17 | 17 | 16 | 15 | 15 | 13 | 13 | 13 | 11 | 11 | 11 | 11 | 11 | 13 |
| Wind Dir | S | S | S | S | S | S | SSW | SSW | SSW | SSW | SSW | S | S | S | S | S | S | S | S | S | S | S | S | S |
| Gust | 21 | 21 | 22 | 22 | 23 | 24 | 25 | 25 | 25 | 25 | 24 | 24 | 23 | 23 | 22 | 21 | 21 | 21 | 21 | 21 | 22 | 22 | 22 | 22 |
| Sky Cover (%) | 31 | 35 | 48 | 47 | 51 | 34 | 39 | 31 | 40 | 60 | 61 | 88 | 84 | 77 | 76 | 54 | 74 | 59 | 44 | 40 | 36 | 32 | 36 | 39 |
| Precipitation Potential (%) | 5 | 0 | 0 | 0 | 0 | 2 | 17 | 20 | 39 | 57 | 57 | 57 | 57 | 57 | 57 | 25 | 25 | 25 | 25 | 25 | 25 | 6 | 6 | 6 |
| Relative Humidity (%) | 64 | 68 | 73 | 73 | 74 | 71 | 62 | 61 | 59 | 57 | 59 | 55 | 55 | 55 | 51 | 57 | 56 | 58 | 62 | 64 | 66 | 69 | 71 | 71 |
| Rain | -- | -- | -- | -- | -- | -- | SChc | SChc | Chc | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Chc | Chc | Chc | Chc | Chc | Chc | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Chc | Chc | Chc | SChc | SChc | SChc | -- | -- | -- |
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