| Point Forecast: Rapid City SD 44.08N 103.24W (Elev. 3291 ft) |
Last Update: 10:16 pm MDT Aug 18, 2026 |
 |
|
[show menu] |
| Date | 08/18 | 08/19 | ||||||||||||||||||||||
| Hour (MDT) | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 |
| Temperature (°F) | 66 | 60 | 60 | 60 | 59 | 60 | 60 | 59 | 59 | 61 | 65 | 69 | 74 | 77 | 80 | 81 | 82 | 83 | 83 | 83 | 84 | 81 | 78 | 71 |
| Dewpoint (°F) | 55 | 57 | 56 | 56 | 56 | 55 | 55 | 54 | 54 | 55 | 56 | 56 | 55 | 55 | 54 | 54 | 53 | 51 | 51 | 50 | 50 | 51 | 52 | 51 |
| Heat Index (°F) | 77 | 80 | 81 | 81 | 81 | 81 | 81 | 82 | 80 | 78 | ||||||||||||||
| Surface Wind (mph) | 6 | 6 | 5 | 5 | 5 | 5 | 5 | 5 | 3 | 3 | 2 | 2 | 2 | 3 | 3 | 5 | 5 | 5 | 5 | 5 | 5 | 3 | 3 | 3 |
| Wind Dir | NW | NW | W | SW | W | W | W | W | W | W | NW | N | E | E | E | E | E | NE | NE | NE | E | SE | S | SW |
| Gust | 16 | 17 | 18 | 18 | 18 | 17 | 16 | |||||||||||||||||
| Sky Cover (%) | 78 | 79 | 71 | 69 | 50 | 34 | 34 | 34 | 12 | 16 | 11 | 10 | 10 | 10 | 11 | 17 | 29 | 43 | 35 | 29 | 15 | 14 | 12 | 10 |
| Precipitation Potential (%) | 47 | 47 | 8 | 8 | 2 | 2 | 2 | 2 | 1 | 1 | 0 | 0 | 1 | 1 | 3 | 3 | 3 | 4 | 4 | 4 | 2 | 2 | 2 | 1 |
| Relative Humidity (%) | 68 | 89 | 85 | 87 | 88 | 86 | 83 | 83 | 83 | 82 | 74 | 64 | 51 | 47 | 41 | 39 | 37 | 34 | 33 | 32 | 31 | 35 | 41 | 49 |
| Rain | Chc | Chc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 08/20 | |||||||||||||||||||||||
| Hour (MDT) | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 |
| Temperature (°F) | 69 | 67 | 66 | 66 | 65 | 64 | 64 | 64 | 62 | 65 | 70 | 75 | 82 | 85 | 87 | 89 | 90 | 90 | 91 | 90 | 89 | 86 | 81 | 76 |
| Dewpoint (°F) | 49 | 49 | 49 | 50 | 49 | 48 | 48 | 47 | 47 | 48 | 51 | 52 | 50 | 49 | 48 | 49 | 48 | 47 | 47 | 47 | 48 | 49 | 49 | 49 |
| Heat Index (°F) | 75 | 81 | 83 | 84 | 86 | 86 | 87 | 88 | 86 | 86 | 84 | 80 | 76 | |||||||||||
| Surface Wind (mph) | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 6 | 6 | 5 | 3 | 3 | 5 | 5 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 5 | 5 |
| Wind Dir | SW | SW | W | W | W | W | W | W | W | W | W | NW | N | N | NE | NE | NE | NE | E | E | E | E | SE | SE |
| Gust | 16 | 20 | 20 | 20 | 21 | 20 | 18 | 17 | 15 | |||||||||||||||
| Sky Cover (%) | 10 | 10 | 6 | 8 | 10 | 10 | 10 | 9 | 9 | 16 | 8 | 7 | 4 | 5 | 7 | 7 | 9 | 17 | 16 | 15 | 11 | 14 | 11 | 7 |
| Precipitation Potential (%) | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 |
| Relative Humidity (%) | 49 | 52 | 54 | 56 | 56 | 57 | 57 | 55 | 57 | 54 | 51 | 44 | 33 | 29 | 26 | 26 | 24 | 22 | 22 | 23 | 25 | 28 | 32 | 39 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| ||||||||||||