| Point Forecast: 4 Miles WNW Castleton IL 41.14N 89.77W (Elev. 206 m) |
Last Update: 6:36 pm CDT Aug 10, 2026 |
![]() |
|
[show menu]![]() |
| Date | 08/10 | 08/11 | ||||||||||||||||||||||
| Hour (CDT) | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 |
| Temperature (°C) | 31 | 31 | 29 | 27 | 26 | 24 | 24 | 23 | 23 | 23 | 23 | 23 | 22 | 23 | 24 | 24 | 25 | 26 | 26 | 27 | 28 | 28 | 29 | 29 |
| Dewpoint (°C) | 24 | 24 | 24 | 23 | 23 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 21 | 22 | 22 | 22 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 |
| Heat Index (°C) | 37 | 37 | 34 | 30 | 26 | 24 | 24 | 24 | 24 | 25 | 26 | 26 | 29 | 31 | 32 | 34 | 34 | |||||||
| Surface Wind (mph) | 6 | 3 | 3 | 3 | 5 | 3 | 3 | 3 | 2 | 3 | 5 | 3 | 3 | 5 | 6 | 7 | 7 | 8 | 10 | 9 | 9 | 8 | 7 | 7 |
| Wind Dir | SW | SSW | SSW | S | S | SSE | SSE | SSE | S | S | SSE | S | S | S | S | S | S | SSW | SSE | S | S | S | SSW | S |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 68 | 48 | 28 | 38 | 40 | 44 | 36 | 37 | 45 | 56 | 63 | 62 | 61 | 61 | 72 | 81 | 89 | 80 | 71 | 65 | 59 | 47 | 35 | 42 |
| Precipitation Potential (%) | 15 | 20 | 14 | 14 | 13 | 16 | 18 | 22 | 28 | 26 | 31 | 31 | 32 | 41 | 62 | 72 | 64 | 44 | 34 | 16 | 11 | 13 | 13 | 12 |
| Relative Humidity (%) | 66 | 70 | 77 | 79 | 84 | 90 | 90 | 93 | 90 | 93 | 93 | 93 | 93 | 93 | 87 | 87 | 88 | 85 | 82 | 82 | 77 | 74 | 70 | 70 |
| Rain | SChc | SChc | -- | -- | -- | SChc | SChc | SChc | Chc | Chc | Chc | Chc | Chc | Chc | Lkly | Lkly | Lkly | Chc | Chc | SChc | -- | -- | -- | -- |
| Thunder | SChc | SChc | -- | -- | -- | SChc | SChc | SChc | Chc | Chc | Chc | Chc | Chc | Chc | Lkly | Lkly | Lkly | Chc | Chc | SChc | -- | -- | -- | -- |
| Date | 08/12 | |||||||||||||||||||||||
| Hour (CDT) | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 |
| Temperature (°C) | 29 | 28 | 27 | 25 | 24 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 21 | 22 | 22 | 24 | 26 | 27 | 28 | 28 | 29 | 29 | 29 | 29 |
| Dewpoint (°C) | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 20 | 20 | 21 | 22 | 22 | 23 | 23 | 23 | 23 | 23 | 24 | 24 | 24 |
| Heat Index (°C) | 33 | 32 | 29 | 25 | 24 | 24 | 26 | 29 | 31 | 32 | 33 | 34 | 34 | 34 | ||||||||||
| Surface Wind (mph) | 7 | 6 | 3 | 3 | 5 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 5 | 5 | 6 | 6 | 6 | 5 | 5 | 5 |
| Wind Dir | ESE | ENE | ENE | ENE | ENE | E | E | E | ESE | ESE | ESE | ESE | ESE | ESE | ESE | ESE | ESE | SE | SE | SSE | SSE | S | SSW | S |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 42 | 40 | 30 | 35 | 37 | 47 | 37 | 32 | 39 | 48 | 53 | 48 | 48 | 47 | 61 | 60 | 58 | 59 | 61 | 62 | 54 | 47 | 39 | 39 |
| Precipitation Potential (%) | 12 | 8 | 8 | 20 | 20 | 24 | 17 | 27 | 27 | 36 | 37 | 37 | 41 | 58 | 58 | 58 | 58 | 58 | 58 | 60 | 60 | 60 | 60 | 60 |
| Relative Humidity (%) | 72 | 74 | 79 | 85 | 87 | 90 | 90 | 90 | 90 | 90 | 90 | 90 | 93 | 93 | 97 | 90 | 85 | 82 | 77 | 74 | 72 | 72 | 72 | 72 |
| Rain | -- | -- | -- | SChc | SChc | SChc | SChc | Chc | Chc | Chc | Chc | Chc | Chc | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly |
| Thunder | -- | -- | -- | SChc | SChc | SChc | SChc | Chc | Chc | Chc | Chc | Chc | Chc | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly |
![]()
| ||||||||||||


