| Point Forecast: Ashton-Sandy Spring MD 39.15N 77.01W (Elev. 137 m) |
Last Update: 10:52 pm EDT Sep 8, 2026 |
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| Date | 09/08 | 09/09 | ||||||||||||||||||||||
| Hour (EDT) | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 |
| Temperature (°C) | 21 | 20 | 20 | 19 | 19 | 19 | 19 | 18 | 18 | 19 | 22 | 24 | 27 | 28 | 28 | 29 | 29 | 29 | 30 | 29 | 28 | 27 | 25 | 24 |
| Dewpoint (°C) | 18 | 18 | 17 | 17 | 17 | 16 | 16 | 16 | 16 | 17 | 16 | 16 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 16 | 16 | 16 |
| Heat Index (°C) | 24 | 27 | 28 | 29 | 30 | 30 | 30 | 30 | 29 | 29 | 27 | 25 | 24 | |||||||||||
| Surface Wind (mph) | 3 | 3 | 3 | 3 | 3 | 5 | 5 | 5 | 5 | 6 | 7 | 8 | 8 | 9 | 10 | 10 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 9 |
| Wind Dir | S | S | S | S | S | S | S | S | S | SW | SW | SW | SW | SW | SW | SW | S | SW | S | S | S | S | S | S |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 55 | 46 | 44 | 42 | 36 | 39 | 30 | 27 | 23 | 26 | 25 | 27 | 26 | 23 | 16 | 27 | 18 | 20 | 16 | 20 | 19 | 18 | 6 | 1 |
| Precipitation Potential (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 0 | 0 | 0 |
| Relative Humidity (%) | 87 | 87 | 84 | 84 | 84 | 84 | 84 | 87 | 87 | 84 | 71 | 60 | 54 | 51 | 49 | 46 | 46 | 46 | 45 | 48 | 49 | 52 | 58 | 60 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 09/10 | |||||||||||||||||||||||
| Hour (EDT) | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 |
| Temperature (°C) | 24 | 23 | 23 | 22 | 22 | 22 | 22 | 21 | 21 | 22 | 23 | 25 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 25 | 24 | 23 | 22 |
| Dewpoint (°C) | 17 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 17 | 17 | 18 | 19 | 19 | 20 | 21 | 21 | 22 | 22 | 22 | 22 | 22 | 22 | 21 | 21 |
| Heat Index (°C) | 24 | 25 | 28 | 29 | 29 | 31 | 31 | 31 | 31 | 29 | 25 | 24 | ||||||||||||
| Surface Wind (mph) | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 8 | 7 | 6 | 6 | 7 | 8 | 9 | 9 | 9 | 9 | 9 | 8 | 7 | 6 | 5 | 3 | 3 |
| Wind Dir | S | S | SW | SW | SW | SW | SW | SW | SW | SW | SW | W | W | W | W | W | W | W | W | W | NW | NW | NW | NW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 3 | 2 | 2 | 4 | 6 | 23 | 20 | 9 | 15 | 40 | 40 | 40 | 40 | 40 | 49 | 75 | 75 | 75 | 75 | 75 | 75 | 80 | 80 | 80 |
| Precipitation Potential (%) | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 5 | 21 | 21 | 21 | 21 | 21 | 21 | 62 | 62 | 62 | 62 | 62 | 62 | 69 | 69 | 69 |
| Relative Humidity (%) | 62 | 64 | 64 | 66 | 66 | 68 | 71 | 73 | 76 | 76 | 73 | 69 | 65 | 63 | 65 | 65 | 67 | 67 | 72 | 77 | 82 | 87 | 90 | 97 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | SChc | SChc | SChc | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | SChc | SChc | SChc |
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