| Point Forecast: 3 Miles SSW Ashburn VA 39N 77.49W (Elev. 299 ft) |
Last Update: 1:31 pm EDT Jul 15, 2025 |
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| Date | 07/15 | 07/16 | ||||||||||||||||||||||
| Hour (EDT) | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| Temperature (°F) | 86 | 84 | 79 | 78 | 77 | 76 | 76 | 74 | 74 | 74 | 74 | 73 | 74 | 76 | 79 | 82 | 84 | 86 | 88 | 88 | 88 | 86 | 84 | 82 |
| Dewpoint (°F) | 75 | 75 | 75 | 75 | 76 | 75 | 75 | 74 | 74 | 74 | 74 | 73 | 74 | 76 | 76 | 77 | 77 | 77 | 77 | 77 | 77 | 76 | 76 | 76 |
| Heat Index (°F) | 95 | 92 | 79 | 78 | 77 | 76 | 76 | 76 | 79 | 90 | 94 | 97 | 100 | 100 | 100 | 96 | 93 | 89 | ||||||
| Surface Wind (mph) | 5 | 5 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 5 | 5 | 6 | 6 | 8 | 9 | 9 | 10 | 10 | 10 | 9 |
| Wind Dir | S | SE | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | W | SW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 63 | 43 | 42 | 38 | 56 | 38 | 47 | 55 | 63 | 58 | 68 | 69 | 66 | 72 | 59 | 73 | 73 | 53 | 62 | 64 | 76 | 81 | 88 | 78 |
| Precipitation Potential (%) | 23 | 8 | 5 | 5 | 5 | 6 | 5 | 5 | 4 | 5 | 5 | 5 | 5 | 3 | 5 | 7 | 6 | 14 | 27 | 39 | 51 | 70 | 72 | 55 |
| Relative Humidity (%) | 70 | 74 | 88 | 91 | 97 | 97 | 97 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 91 | 85 | 80 | 75 | 70 | 70 | 70 | 72 | 77 | 82 |
| Rain | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | Chc | Chc | Chc | Lkly | Lkly | Lkly |
| Thunder | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | Chc | Chc | Lkly | Lkly | Lkly |
| Date | 07/17 | |||||||||||||||||||||||
| Hour (EDT) | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| Temperature (°F) | 81 | 80 | 78 | 77 | 77 | 77 | 76 | 76 | 75 | 75 | 75 | 75 | 76 | 78 | 81 | 84 | 87 | 90 | 92 | 93 | 93 | 92 | 91 | 90 |
| Dewpoint (°F) | 75 | 75 | 76 | 76 | 75 | 75 | 74 | 74 | 74 | 74 | 74 | 75 | 75 | 76 | 76 | 76 | 76 | 76 | 75 | 75 | 74 | 74 | 74 | 74 |
| Heat Index (°F) | 87 | 85 | 78 | 77 | 77 | 77 | 76 | 76 | 75 | 75 | 75 | 75 | 76 | 78 | 87 | 93 | 98 | 102 | 103 | 105 | 103 | 102 | 101 | 99 |
| Surface Wind (mph) | 8 | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 7 | 7 | 8 | 8 | 9 | 9 | 9 | 9 | 8 |
| Wind Dir | S | S | SW | SW | S | S | S | S | S | SW | SW | SW | SW | SW | SW | SW | SW | SW | W | W | W | SW | SW | SW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 72 | 71 | 66 | 67 | 67 | 67 | 66 | 66 | 66 | 66 | 66 | 58 | 50 | 42 | 40 | 37 | 35 | 42 | 50 | 57 | 57 | 57 | 57 | 57 |
| Precipitation Potential (%) | 58 | 22 | 22 | 22 | 22 | 22 | 22 | 5 | 5 | 5 | 5 | 5 | 5 | 9 | 9 | 9 | 9 | 9 | 9 | 35 | 35 | 35 | 35 | 35 |
| Relative Humidity (%) | 82 | 85 | 94 | 97 | 94 | 94 | 94 | 94 | 97 | 97 | 97 | 100 | 97 | 94 | 85 | 77 | 70 | 64 | 58 | 56 | 54 | 56 | 58 | 60 |
| Rain | Lkly | SChc | SChc | SChc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | Chc | Chc | Chc | Chc | Chc |
| Thunder | Lkly | SChc | SChc | SChc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | Chc | Chc | Chc | Chc | Chc |
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