| Point Forecast: Yankton SD 42.88N 97.4W (Elev. 1204 ft) |
Last Update: 7:03 pm CDT Aug 15, 2026 |
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| Date | 08/15 | 08/16 | ||||||||||||||||||||||
| Hour (CDT) | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 |
| Temperature (°F) | 78 | 75 | 73 | 70 | 69 | 69 | 68 | 67 | 65 | 64 | 64 | 63 | 65 | 66 | 69 | 72 | 73 | 75 | 78 | 78 | 79 | 80 | 78 | 78 |
| Dewpoint (°F) | 71 | 71 | 70 | 70 | 69 | 69 | 68 | 66 | 65 | 64 | 63 | 63 | 64 | 66 | 66 | 66 | 66 | 66 | 66 | 66 | 66 | 66 | 66 | 67 |
| Heat Index (°F) | 78 | 75 | 75 | 78 | 78 | 79 | 82 | 78 | 78 | |||||||||||||||
| Surface Wind (mph) | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 7 | 7 | 7 | 6 | 6 | 7 | 7 | 8 | 9 | 10 | 10 | 10 | 9 | 9 | 8 | 8 | 7 |
| Wind Dir | WNW | WNW | WNW | NW | NW | NNW | NNW | NNW | NNW | NW | NNW | NNW | NNW | NNW | N | NNW | NNW | NNW | NNW | NNW | NNW | NNW | NNW | NNW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 48 | 36 | 34 | 35 | 28 | 37 | 46 | 41 | 50 | 53 | 56 | 54 | 39 | 36 | 24 | 20 | 18 | 21 | 21 | 21 | 21 | 21 | 21 | 22 |
| Precipitation Potential (%) | 12 | 5 | 6 | 7 | 7 | 6 | 6 | 6 | 6 | 5 | 5 | 4 | 3 | 3 | 2 | 2 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 |
| Relative Humidity (%) | 80 | 85 | 90 | 100 | 100 | 100 | 100 | 97 | 100 | 100 | 97 | 100 | 97 | 100 | 90 | 81 | 79 | 74 | 67 | 67 | 64 | 62 | 67 | 69 |
| Rain | Chc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 08/17 | |||||||||||||||||||||||
| Hour (CDT) | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 |
| Temperature (°F) | 75 | 70 | 68 | 66 | 65 | 64 | 63 | 61 | 60 | 60 | 59 | 60 | 62 | 66 | 70 | 73 | 76 | 78 | 80 | 81 | 82 | 81 | 80 | 79 |
| Dewpoint (°F) | 67 | 66 | 65 | 64 | 63 | 62 | 61 | 61 | 60 | 60 | 59 | 60 | 62 | 66 | 68 | 69 | 70 | 70 | 71 | 72 | 73 | 74 | 75 | 75 |
| Heat Index (°F) | 75 | 76 | 78 | 83 | 85 | 87 | 86 | 85 | 79 | |||||||||||||||
| Surface Wind (mph) | 3 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 3 | 5 | 6 | 8 | 10 | 11 | 13 | 13 | 11 | 10 | 8 | 7 |
| Wind Dir | N | NNW | NNW | NW | WNW | WSW | WSW | SW | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SW | SW | SW | WSW | WSW |
| Gust | 20 | 20 | ||||||||||||||||||||||
| Sky Cover (%) | 7 | 7 | 16 | 13 | 43 | 40 | 30 | 30 | 50 | 48 | 33 | 50 | 72 | 62 | 52 | 45 | 38 | 31 | 37 | 44 | 50 | 47 | 43 | 40 |
| Precipitation Potential (%) | 0 | 0 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 11 | 12 | 12 | 12 | 12 | 12 | 12 | 47 | 47 | 47 | 47 | 47 | 47 | 52 |
| Relative Humidity (%) | 76 | 87 | 90 | 93 | 93 | 93 | 93 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 93 | 87 | 82 | 76 | 74 | 74 | 74 | 79 | 85 | 88 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | Chc | Chc | Chc | Chc | Chc | Chc | Chc |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | Chc | Chc | Chc | Chc |
