| Point Forecast: 2 Miles NNW Grantsburg IL 37.39N 88.77W |
Last Update: 1:26 am CDT May 17, 2026 |
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| Date | 05/17 | 05/18 | ||||||||||||||||||||||
| Hour (CDT) | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 |
| Temperature (°F) | 68 | 68 | 67 | 66 | 68 | 70 | 73 | 78 | 81 | 84 | 85 | 87 | 87 | 87 | 88 | 86 | 84 | 81 | 77 | 75 | 75 | 74 | 74 | 74 |
| Dewpoint (°F) | 63 | 61 | 60 | 60 | 60 | 62 | 63 | 64 | 63 | 63 | 62 | 61 | 61 | 59 | 58 | 58 | 57 | 56 | 56 | 55 | 55 | 56 | 56 | 57 |
| Heat Index (°F) | 78 | 82 | 85 | 86 | 87 | 87 | 86 | 87 | 85 | 83 | 81 | 77 | 75 | 75 | ||||||||||
| Surface Wind (mph) | 7 | 7 | 6 | 6 | 6 | 7 | 8 | 10 | 11 | 11 | 11 | 11 | 13 | 11 | 11 | 10 | 8 | 7 | 8 | 8 | 7 | 7 | 8 | 9 |
| Wind Dir | S | S | S | S | S | S | SSW | SSW | SSW | SSW | S | S | S | S | S | S | S | S | S | S | S | S | S | S |
| Gust | 18 | 18 | 18 | 20 | 21 | 21 | 22 | 22 | 22 | 22 | 22 | 22 | 18 | 20 | 20 | 18 | 18 | 20 | 20 | |||||
| Sky Cover (%) | 63 | 64 | 75 | 56 | 40 | 31 | 23 | 35 | 29 | 14 | 15 | 15 | 3 | 1 | 1 | 0 | 3 | 1 | 1 | 6 | 11 | 12 | 18 | 26 |
| Precipitation Potential (%) | 5 | 4 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 | 3 |
| Relative Humidity (%) | 84 | 78 | 78 | 81 | 76 | 76 | 71 | 62 | 54 | 49 | 46 | 42 | 42 | 39 | 36 | 39 | 40 | 42 | 48 | 50 | 50 | 53 | 53 | 55 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 05/19 | |||||||||||||||||||||||
| Hour (CDT) | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 |
| Temperature (°F) | 71 | 71 | 71 | 69 | 71 | 73 | 76 | 80 | 83 | 85 | 86 | 86 | 87 | 86 | 86 | 86 | 83 | 80 | 79 | 78 | 77 | 77 | 76 | 75 |
| Dewpoint (°F) | 58 | 59 | 60 | 61 | 62 | 64 | 66 | 66 | 67 | 68 | 68 | 68 | 68 | 67 | 67 | 66 | 66 | 65 | 64 | 64 | 64 | 65 | 65 | 65 |
| Heat Index (°F) | 76 | 82 | 86 | 88 | 89 | 89 | 91 | 89 | 89 | 88 | 85 | 82 | 79 | 78 | 77 | 77 | 76 | 75 | ||||||
| Surface Wind (mph) | 8 | 8 | 8 | 8 | 8 | 10 | 11 | 13 | 14 | 14 | 14 | 13 | 13 | 13 | 11 | 10 | 9 | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
| Wind Dir | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S |
| Gust | 20 | 18 | 20 | 20 | 20 | 21 | 23 | 25 | 25 | 24 | 24 | 24 | 23 | 23 | 22 | 21 | 20 | 18 | 18 | 18 | 18 | 18 | 18 | 18 |
| Sky Cover (%) | 28 | 49 | 27 | 38 | 45 | 42 | 49 | 49 | 42 | 42 | 65 | 60 | 73 | 68 | 87 | 73 | 72 | 57 | 51 | 45 | 43 | 42 | 40 | 41 |
| Precipitation Potential (%) | 6 | 6 | 0 | 0 | 0 | 2 | 5 | 5 | 12 | 31 | 49 | 49 | 49 | 49 | 49 | 49 | 26 | 26 | 26 | 26 | 26 | 26 | 10 | 10 |
| Relative Humidity (%) | 64 | 66 | 68 | 76 | 73 | 73 | 71 | 62 | 59 | 57 | 55 | 55 | 53 | 53 | 53 | 51 | 57 | 60 | 60 | 62 | 64 | 67 | 69 | 71 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | Chc | Chc | Chc | Chc | Chc | Chc | SChc | SChc | SChc | SChc | SChc | SChc | -- | -- |
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