| Point Forecast: Decatur Airport IL 39.84N 88.88W (Elev. 650 ft) |
Last Update: 5:10 am CDT Jul 15, 2025 |
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| Date | 07/15 | 07/16 | ||||||||||||||||||||||
| Hour (CDT) | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 |
| Temperature (°F) | 72 | 72 | 73 | 75 | 78 | 82 | 84 | 83 | 83 | 85 | 85 | 85 | 85 | 83 | 82 | 81 | 78 | 76 | 75 | 75 | 75 | 75 | 74 | 73 |
| Dewpoint (°F) | 68 | 68 | 69 | 71 | 73 | 73 | 74 | 74 | 74 | 74 | 74 | 74 | 74 | 73 | 73 | 72 | 72 | 72 | 73 | 73 | 72 | 72 | 72 | 72 |
| Heat Index (°F) | 75 | 78 | 87 | 91 | 90 | 90 | 93 | 93 | 93 | 93 | 89 | 87 | 85 | 78 | 76 | 75 | 75 | 75 | 75 | |||||
| Surface Wind (mph) | 3 | 3 | 5 | 6 | 6 | 7 | 7 | 7 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 |
| Wind Dir | E | E | ESE | ESE | SE | SSE | SSE | SSE | S | S | SSE | SSE | SSE | SSE | SSE | SSE | SSE | SSE | SSE | S | S | S | S | SSW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 49 | 48 | 48 | 49 | 51 | 53 | 58 | 63 | 68 | 68 | 68 | 68 | 64 | 59 | 55 | 53 | 50 | 48 | 47 | 45 | 44 | 48 | 53 | 57 |
| Precipitation Potential (%) | 2 | 3 | 15 | 10 | 9 | 11 | 10 | 10 | 32 | 31 | 35 | 33 | 33 | 32 | 18 | 18 | 18 | 12 | 12 | 12 | 10 | 10 | 10 | 9 |
| Relative Humidity (%) | 87 | 87 | 87 | 86 | 85 | 74 | 72 | 74 | 74 | 70 | 70 | 70 | 70 | 72 | 74 | 74 | 82 | 87 | 94 | 94 | 90 | 90 | 93 | 97 |
| Rain | -- | -- | SChc | -- | -- | -- | -- | -- | Chc | Chc | Chc | Chc | Chc | Chc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | Chc | Chc | Chc | Chc | Chc | Chc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- |
| Date | 07/17 | |||||||||||||||||||||||
| Hour (CDT) | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 |
| Temperature (°F) | 73 | 73 | 74 | 77 | 79 | 83 | 85 | 87 | 88 | 89 | 90 | 90 | 89 | 87 | 85 | 83 | 82 | 80 | 79 | 78 | 77 | 77 | 76 | 76 |
| Dewpoint (°F) | 72 | 73 | 73 | 74 | 75 | 75 | 75 | 75 | 75 | 75 | 74 | 74 | 74 | 75 | 75 | 75 | 74 | 74 | 74 | 73 | 73 | 73 | 72 | 72 |
| Heat Index (°F) | 77 | 79 | 90 | 94 | 96 | 98 | 99 | 99 | 99 | 98 | 96 | 94 | 90 | 88 | 85 | 79 | 78 | 77 | 77 | 76 | 76 | |||
| Surface Wind (mph) | 5 | 5 | 6 | 6 | 6 | 6 | 7 | 7 | 8 | 9 | 9 | 9 | 8 | 8 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 |
| Wind Dir | SSW | SSW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SSW | SSW | SSW | SSW | SSW | SSW | SW | SW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 56 | 55 | 53 | 51 | 45 | 21 | 32 | 27 | 22 | 24 | 26 | 28 | 32 | 35 | 39 | 39 | 39 | 39 | 45 | 52 | 58 | 55 | 51 | 48 |
| Precipitation Potential (%) | 9 | 9 | 11 | 11 | 11 | 11 | 11 | 11 | 23 | 23 | 23 | 23 | 23 | 23 | 34 | 34 | 34 | 34 | 34 | 34 | 29 | 29 | 29 | 29 |
| Relative Humidity (%) | 97 | 100 | 97 | 90 | 88 | 77 | 72 | 68 | 66 | 64 | 60 | 60 | 61 | 68 | 72 | 77 | 77 | 82 | 85 | 85 | 88 | 88 | 87 | 87 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | SChc | SChc | SChc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | SChc | SChc | SChc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | SChc |
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