| Point Forecast: 3 Miles SSE Carlinville IL 39.25N 89.86W (Elev. 551 ft) |
Last Update: 2:01 am CDT May 18, 2026 |
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| Date | 05/18 | 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 | 71 | 72 | 74 | 75 | 77 | 76 | 76 | 76 | 76 | 76 | 77 | 76 | 76 | 75 | 73 | 71 | 71 | 71 | 70 | 71 | 71 | 70 |
| Dewpoint (°F) | 64 | 64 | 65 | 66 | 67 | 68 | 69 | 68 | 68 | 68 | 68 | 68 | 67 | 67 | 67 | 66 | 65 | 65 | 65 | 65 | 65 | 66 | 65 | 65 |
| Heat Index (°F) | 75 | 77 | 76 | 76 | 76 | 76 | 76 | 77 | 76 | 76 | 75 | |||||||||||||
| Surface Wind (mph) | 14 | 14 | 14 | 15 | 16 | 17 | 17 | 16 | 16 | 16 | 14 | 15 | 14 | 15 | 15 | 16 | 16 | 16 | 15 | 15 | 14 | 15 | 15 | 15 |
| Wind Dir | S | S | S | S | S | S | S | SW | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S |
| Gust | 23 | 23 | 24 | 25 | 26 | 26 | 26 | 26 | 24 | 25 | 23 | 22 | 22 | 24 | 24 | 23 | 24 | 24 | 23 | 24 | 24 | 26 | 26 | 26 |
| Sky Cover (%) | 47 | 53 | 59 | 49 | 69 | 85 | 88 | 89 | 91 | 92 | 89 | 91 | 88 | 87 | 82 | 79 | 80 | 64 | 58 | 51 | 53 | 41 | 37 | 47 |
| Precipitation Potential (%) | 3 | 4 | 12 | 25 | 37 | 56 | 75 | 82 | 90 | 91 | 91 | 75 | 59 | 53 | 47 | 36 | 24 | 22 | 17 | 13 | 8 | 10 | 10 | 14 |
| Relative Humidity (%) | 79 | 79 | 81 | 81 | 79 | 79 | 76 | 76 | 76 | 76 | 76 | 76 | 71 | 74 | 74 | 74 | 76 | 81 | 81 | 81 | 84 | 84 | 81 | 84 |
| Rain | -- | -- | -- | Chc | Chc | Lkly | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Lkly | Chc | Chc | Chc | SChc | SChc | SChc | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | Lkly | Lkly | Lkly | Chc | Chc | Chc | Chc | SChc | SChc | SChc | -- | -- | -- | -- | -- |
| Date | 05/20 | |||||||||||||||||||||||
| 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) | 70 | 70 | 70 | 67 | 71 | 72 | 77 | 78 | 79 | 79 | 80 | 78 | 77 | 76 | 73 | 72 | 69 | 67 | 65 | 64 | 62 | 61 | 59 | 58 |
| Dewpoint (°F) | 65 | 65 | 65 | 64 | 66 | 66 | 67 | 67 | 67 | 68 | 67 | 67 | 66 | 65 | 64 | 62 | 61 | 60 | 59 | 58 | 57 | 56 | 54 | 53 |
| Heat Index (°F) | 77 | 78 | 79 | 79 | 82 | 78 | 77 | 76 | ||||||||||||||||
| Surface Wind (mph) | 15 | 14 | 13 | 13 | 14 | 15 | 16 | 16 | 15 | 14 | 13 | 11 | 11 | 10 | 9 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 9 | 9 |
| Wind Dir | S | S | S | S | S | SW | SW | SW | SW | SW | SW | W | W | NW | NW | NW | NW | NW | NW | NW | N | N | N | N |
| Gust | 26 | 25 | 23 | 22 | 23 | 24 | 24 | 24 | 24 | 22 | 21 | |||||||||||||
| Sky Cover (%) | 64 | 71 | 76 | 68 | 66 | 64 | 71 | 78 | 82 | 87 | 83 | 75 | 88 | 84 | 78 | 85 | 96 | 94 | 91 | 91 | 90 | 90 | 86 | 81 |
| Precipitation Potential (%) | 20 | 23 | 37 | 49 | 58 | 64 | 67 | 76 | 86 | 96 | 96 | 96 | 96 | 96 | 96 | 62 | 62 | 62 | 62 | 62 | 62 | 24 | 24 | 24 |
| Relative Humidity (%) | 84 | 84 | 84 | 90 | 84 | 81 | 71 | 69 | 67 | 69 | 65 | 69 | 69 | 69 | 73 | 71 | 76 | 78 | 81 | 81 | 84 | 84 | 83 | 83 |
| Rain | SChc | SChc | Chc | Chc | Lkly | Lkly | Lkly | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | SChc | SChc | SChc |
| Thunder | -- | -- | -- | SChc | SChc | SChc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- |
