| Point Forecast: Ashburn VA 39.05N 77.49W (Elev. 91 m) |
Last Update: 1:31 pm EDT Jul 15, 2025 |
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| Date | 07/15 | 07/16 | ||||||||||||||||||||||
| Hour (EDT) | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| Temperature (°C) | 27 | 26 | 25 | 25 | 24 | 24 | 24 | 23 | 23 | 23 | 23 | 25 | 27 | 28 | 29 | 31 | 31 | 31 | 31 | 30 | 29 | 28 | 27 | 27 |
| Dewpoint (°C) | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 23 | 23 | 23 | 23 | 24 | 24 | 25 | 24 | 25 | 25 | 25 | 25 | 24 | 24 | 24 | 24 | 24 |
| Heat Index (°C) | 29 | 26 | 25 | 25 | 24 | 24 | 24 | 25 | 30 | 32 | 34 | 37 | 38 | 38 | 38 | 36 | 34 | 33 | 31 | 29 | ||||
| Surface Wind (mph) | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 5 | 5 | 6 | 6 | 7 | 8 | 9 | 10 | 10 | 10 | 9 | 8 | 7 |
| Wind Dir | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | W | SW | S | S |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 42 | 39 | 55 | 44 | 44 | 55 | 65 | 60 | 68 | 68 | 68 | 73 | 63 | 81 | 72 | 51 | 51 | 67 | 80 | 80 | 87 | 76 | 72 | 73 |
| Precipitation Potential (%) | 5 | 4 | 5 | 6 | 5 | 5 | 4 | 4 | 4 | 5 | 5 | 3 | 4 | 7 | 6 | 12 | 26 | 39 | 51 | 70 | 72 | 53 | 58 | 24 |
| Relative Humidity (%) | 85 | 94 | 97 | 94 | 97 | 100 | 100 | 100 | 100 | 100 | 100 | 94 | 88 | 85 | 77 | 72 | 70 | 70 | 70 | 72 | 77 | 80 | 82 | 85 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | Chc | Chc | Chc | Lkly | Lkly | Chc | Lkly | SChc |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | Chc | Chc | Lkly | Lkly | Chc | Lkly | SChc |
| Date | 07/17 | |||||||||||||||||||||||
| Hour (EDT) | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| Temperature (°C) | 26 | 25 | 25 | 25 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 26 | 27 | 29 | 31 | 32 | 33 | 34 | 34 | 34 | 33 | 32 | 31 | 30 |
| Dewpoint (°C) | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 23 | 23 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 23 | 23 | 23 | 24 | 24 |
| Heat Index (°C) | 26 | 25 | 25 | 25 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 26 | 31 | 34 | 37 | 38 | 39 | 41 | 41 | 39 | 39 | 37 | 37 | 36 |
| Surface Wind (mph) | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 7 | 7 | 8 | 8 | 9 | 9 | 9 | 9 | 9 | 8 | 7 | 6 |
| Wind Dir | S | S | S | S | S | S | S | SW | SW | SW | SW | SW | SW | SW | SW | SW | W | W | W | SW | SW | SW | SW | SW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 67 | 66 | 65 | 66 | 66 | 67 | 67 | 68 | 68 | 59 | 50 | 41 | 39 | 37 | 35 | 42 | 49 | 56 | 56 | 56 | 56 | 56 | 56 | 36 |
| Precipitation Potential (%) | 24 | 24 | 24 | 24 | 24 | 5 | 5 | 5 | 5 | 5 | 5 | 9 | 9 | 9 | 9 | 9 | 9 | 34 | 34 | 34 | 34 | 34 | 34 | 10 |
| Relative Humidity (%) | 91 | 94 | 94 | 94 | 97 | 97 | 100 | 97 | 97 | 100 | 100 | 94 | 85 | 72 | 66 | 62 | 58 | 56 | 56 | 54 | 56 | 60 | 66 | 72 |
| Rain | SChc | SChc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | Chc | Chc | Chc | Chc | Chc | Chc | -- |
| Thunder | SChc | SChc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | Chc | Chc | Chc | Chc | Chc | Chc | -- |
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