| Point Forecast: St. Charles County Smartt Airport MO 38.94N 90.45W (Elev. 427 ft) |
Last Update: 1:26 am CDT Aug 17, 2026 |
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| Date | 08/17 | 08/18 | ||||||||||||||||||||||
| Hour (CDT) | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 |
| Temperature (°F) | 73 | 73 | 73 | 73 | 72 | 69 | 70 | 73 | 76 | 78 | 82 | 83 | 83 | 84 | 84 | 83 | 82 | 81 | 78 | 75 | 73 | 71 | 70 | 70 |
| Dewpoint (°F) | 72 | 73 | 73 | 72 | 70 | 69 | 69 | 69 | 69 | 68 | 67 | 66 | 66 | 66 | 65 | 66 | 66 | 67 | 67 | 67 | 67 | 67 | 66 | 66 |
| Heat Index (°F) | 77 | 83 | 84 | 84 | 86 | 86 | 84 | 83 | 82 | 77 | 75 | |||||||||||||
| Surface Wind (mph) | 2 | 3 | 5 | 5 | 6 | 7 | 8 | 8 | 8 | 8 | 9 | 9 | 9 | 9 | 9 | 8 | 7 | 6 | 5 | 3 | 3 | 2 | 2 | 1 |
| Wind Dir | NW | NW | NW | NW | NW | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | NE | NE | NE | N |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 100 | 91 | 83 | 64 | 44 | 24 | 18 | 12 | 7 | 7 | 8 | 8 | 25 | 41 | 58 | 56 | 55 | 53 | 47 | 41 | 35 | 36 | 37 | 38 |
| Precipitation Potential (%) | 16 | 10 | 6 | 3 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Relative Humidity (%) | 97 | 100 | 100 | 97 | 93 | 100 | 97 | 87 | 84 | 74 | 63 | 58 | 58 | 55 | 53 | 58 | 60 | 65 | 71 | 76 | 81 | 87 | 87 | 87 |
| Rain | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 08/19 | |||||||||||||||||||||||
| Hour (CDT) | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 |
| Temperature (°F) | 68 | 68 | 67 | 67 | 65 | 67 | 70 | 73 | 78 | 80 | 82 | 85 | 86 | 87 | 87 | 87 | 86 | 84 | 82 | 79 | 77 | 75 | 75 | 74 |
| Dewpoint (°F) | 66 | 66 | 65 | 65 | 65 | 66 | 67 | 67 | 67 | 66 | 66 | 66 | 67 | 67 | 67 | 68 | 68 | 70 | 70 | 70 | 69 | 69 | 68 | 68 |
| Heat Index (°F) | 78 | 82 | 84 | 87 | 89 | 90 | 90 | 91 | 89 | 88 | 86 | 79 | 77 | 75 | 75 | |||||||||
| Surface Wind (mph) | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 6 |
| Wind Dir | NW | SW | W | S | SW | S | SW | SW | SW | SW | SW | SW | SW | SW | SW | S | S | S | SE | SE | SE | SE | SE | SE |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 41 | 43 | 45 | 37 | 28 | 20 | 15 | 10 | 5 | 8 | 11 | 13 | 11 | 8 | 6 | 5 | 7 | 9 | 27 | 33 | 38 | 38 | 39 | 39 |
| Precipitation Potential (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 6 | 3 | 3 | 3 | 3 | 3 | 3 | 72 |
| Relative Humidity (%) | 93 | 93 | 93 | 93 | 100 | 97 | 90 | 81 | 69 | 62 | 58 | 53 | 53 | 52 | 52 | 53 | 55 | 63 | 67 | 74 | 76 | 82 | 79 | 82 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | Lkly |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | Lkly |
