| Point Forecast: Ashton-Sandy Spring MD 39.15N 77.01W (Elev. 449 ft) |
Last Update: 7:53 am EDT Aug 8, 2026 |
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| Date | 08/08 | 08/09 | ||||||||||||||||||||||
| Hour (EDT) | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 |
| Temperature (°F) | 78 | 81 | 83 | 86 | 87 | 89 | 90 | 89 | 88 | 86 | 83 | 81 | 79 | 78 | 77 | 76 | 75 | 74 | 74 | 73 | 73 | 73 | 72 | 75 |
| Dewpoint (°F) | 72 | 72 | 72 | 71 | 71 | 72 | 72 | 71 | 71 | 71 | 72 | 71 | 71 | 71 | 71 | 71 | 71 | 71 | 70 | 70 | 70 | 70 | 70 | 71 |
| Heat Index (°F) | 78 | 85 | 88 | 91 | 93 | 96 | 97 | 95 | 94 | 91 | 88 | 85 | 79 | 78 | 77 | 76 | 75 | 75 | ||||||
| Surface Wind (mph) | 3 | 5 | 5 | 5 | 6 | 6 | 7 | 8 | 7 | 7 | 6 | 5 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 3 | 3 |
| Wind Dir | W | W | W | W | W | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | W | W | W | W | W | W |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 35 | 26 | 27 | 23 | 26 | 39 | 58 | 67 | 66 | 55 | 59 | 65 | 51 | 39 | 35 | 30 | 36 | 46 | 46 | 48 | 53 | 54 | 54 | 49 |
| Precipitation Potential (%) | 1 | 5 | 6 | 5 | 6 | 7 | 37 | 48 | 45 | 27 | 14 | 22 | 6 | 2 | 2 | 1 | 0 | 1 | 0 | 1 | 1 | 0 | 0 | 1 |
| Relative Humidity (%) | 82 | 74 | 70 | 61 | 59 | 57 | 56 | 56 | 57 | 61 | 70 | 72 | 77 | 79 | 82 | 85 | 87 | 90 | 87 | 90 | 90 | 90 | 93 | 87 |
| Rain | -- | -- | -- | -- | -- | -- | Chc | Chc | Chc | Chc | -- | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | Chc | Chc | Chc | Chc | -- | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 08/10 | |||||||||||||||||||||||
| Hour (EDT) | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 |
| Temperature (°F) | 77 | 81 | 83 | 85 | 87 | 88 | 89 | 89 | 90 | 88 | 86 | 83 | 81 | 79 | 78 | 77 | 76 | 74 | 74 | 74 | 72 | 72 | 73 | 74 |
| Dewpoint (°F) | 71 | 71 | 71 | 71 | 71 | 71 | 70 | 69 | 69 | 69 | 70 | 69 | 69 | 69 | 69 | 68 | 68 | 67 | 67 | 66 | 66 | 66 | 67 | 68 |
| Heat Index (°F) | 77 | 85 | 88 | 90 | 93 | 94 | 94 | 94 | 95 | 92 | 91 | 87 | 84 | 79 | 78 | 77 | 76 | |||||||
| Surface Wind (mph) | 5 | 6 | 6 | 7 | 7 | 7 | 7 | 7 | 6 | 5 | 3 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Wind Dir | W | W | W | W | W | W | W | W | W | W | W | W | NW | W | W | W | W | NW | NW | NW | NW | NW | NW | NW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 49 | 39 | 31 | 32 | 25 | 25 | 24 | 25 | 25 | 28 | 26 | 20 | 29 | 30 | 34 | 27 | 26 | 28 | 24 | 27 | 30 | 30 | 27 | 24 |
| Precipitation Potential (%) | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 6 | 4 | 5 | 5 | 3 | 3 | 3 | 3 | 3 | 3 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Relative Humidity (%) | 82 | 72 | 67 | 63 | 59 | 57 | 54 | 52 | 50 | 54 | 59 | 63 | 67 | 72 | 74 | 74 | 76 | 79 | 79 | 76 | 81 | 81 | 81 | 82 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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