| Point Forecast: 3 Miles SSW Ashburn VA 39N 77.49W (Elev. 91 m) |
Last Update: 9:25 am EDT Jul 15, 2025 |
 |
|
[show menu] |
| Date | 07/15 | 07/16 | ||||||||||||||||||||||
| 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 (°C) | 25 | 26 | 28 | 29 | 30 | 31 | 31 | 31 | 30 | 29 | 29 | 27 | 26 | 26 | 25 | 24 | 24 | 23 | 23 | 23 | 23 | 23 | 23 | 24 |
| Dewpoint (°C) | 23 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 23 | 23 | 23 | 23 | 23 | 23 | 24 |
| Heat Index (°C) | 25 | 26 | 32 | 34 | 36 | 37 | 37 | 36 | 35 | 34 | 33 | 31 | 26 | 26 | 25 | 24 | 24 | 24 | ||||||
| Surface Wind (mph) | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 5 | 5 | 5 | 5 | 5 | 3 | 3 | 3 | 2 | 2 | 2 | 3 | 3 | 3 | 5 | 5 | 6 |
| Wind Dir | N | N | N | NW | S | SE | S | S | SE | SE | S | S | S | S | S | S | S | S | S | S | S | S | S | S |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 51 | 49 | 46 | 32 | 30 | 45 | 55 | 67 | 68 | 59 | 63 | 46 | 47 | 48 | 57 | 48 | 51 | 49 | 40 | 33 | 59 | 67 | 67 | 54 |
| Precipitation Potential (%) | 1 | 3 | 3 | 6 | 13 | 23 | 33 | 50 | 52 | 39 | 44 | 19 | 16 | 17 | 13 | 4 | 4 | 2 | 2 | 4 | 5 | 9 | 8 | 25 |
| Relative Humidity (%) | 90 | 88 | 79 | 77 | 72 | 70 | 66 | 68 | 70 | 72 | 74 | 82 | 91 | 91 | 94 | 97 | 100 | 100 | 100 | 100 | 100 | 100 | 97 | 97 |
| Rain | -- | -- | -- | -- | -- | SChc | Chc | Chc | Chc | Chc | Chc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | Chc |
| Thunder | -- | -- | -- | -- | -- | SChc | Chc | Chc | Chc | Chc | Chc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 07/17 | |||||||||||||||||||||||
| 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 (°C) | 26 | 28 | 29 | 30 | 31 | 31 | 31 | 31 | 30 | 29 | 28 | 27 | 26 | 26 | 25 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 26 |
| Dewpoint (°C) | 24 | 25 | 26 | 26 | 26 | 26 | 25 | 25 | 24 | 24 | 25 | 25 | 25 | 24 | 24 | 24 | 23 | 23 | 23 | 23 | 23 | 24 | 24 | 24 |
| Heat Index (°C) | 26 | 32 | 35 | 37 | 38 | 39 | 38 | 37 | 36 | 34 | 33 | 31 | 26 | 26 | 25 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 26 |
| Surface Wind (mph) | 6 | 7 | 8 | 9 | 10 | 10 | 10 | 10 | 10 | 9 | 9 | 8 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| Wind Dir | SW | SW | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | SW | SW | SW | SW | SW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 72 | 69 | 66 | 71 | 75 | 80 | 80 | 80 | 80 | 80 | 80 | 71 | 70 | 68 | 67 | 67 | 68 | 68 | 63 | 58 | 53 | 50 | 47 | 44 |
| Precipitation Potential (%) | 25 | 25 | 25 | 25 | 25 | 70 | 70 | 70 | 70 | 70 | 70 | 24 | 24 | 24 | 24 | 24 | 24 | 7 | 7 | 7 | 7 | 7 | 7 | 12 |
| Relative Humidity (%) | 91 | 85 | 82 | 77 | 75 | 72 | 70 | 72 | 72 | 75 | 82 | 88 | 94 | 94 | 94 | 97 | 94 | 94 | 97 | 97 | 97 | 100 | 97 | 94 |
| Rain | Chc | Chc | Chc | Chc | Chc | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | SChc | SChc | SChc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | Chc | Chc | Chc | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | SChc | SChc | SChc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- |
| ||||||||||||