| Point Forecast: Mc Lean VA 38.95N 77.19W (Elev. 77 m) |
Last Update: 5:27 am EDT Jul 17, 2026 |
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| Date | 07/17 | 07/18 | ||||||||||||||||||||||
| Hour (EDT) | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 |
| Temperature (°C) | 24 | 26 | 27 | 28 | 29 | 31 | 31 | 32 | 33 | 33 | 32 | 32 | 31 | 31 | 28 | 27 | 26 | 26 | 26 | 25 | 25 | 24 | 24 | 24 |
| Dewpoint (°C) | 16 | 16 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 16 | 16 | 16 | 17 | 17 | 17 | 18 | 18 | 18 | 18 | 19 | 19 | 19 | 19 | 20 |
| Heat Index (°C) | 24 | 26 | 27 | 28 | 30 | 31 | 31 | 32 | 33 | 33 | 32 | 32 | 31 | 31 | 28 | 28 | 26 | 26 | 26 | 25 | 25 | 24 | 24 | 24 |
| Surface Wind (mph) | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Wind Dir | N | N | N | N | NE | N | NW | NW | NW | NW | NW | N | N | E | SE | SE | SE | S | S | S | S | S | SE | S |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 60 | 60 | 59 | 59 | 58 | 58 | 58 | 58 | 58 | 57 | 57 | 59 | 61 | 63 | 62 | 61 | 60 | 66 | 72 | 78 | 76 | 74 | 72 | 70 |
| Precipitation Potential (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 3 | 7 | 9 | 6 | 9 | 15 | 11 |
| Relative Humidity (%) | 62 | 56 | 54 | 51 | 46 | 43 | 42 | 39 | 38 | 37 | 38 | 39 | 42 | 45 | 53 | 58 | 60 | 62 | 64 | 69 | 69 | 76 | 76 | 79 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | -- |
| Date | 07/19 | |||||||||||||||||||||||
| Hour (EDT) | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 |
| Temperature (°C) | 23 | 24 | 26 | 28 | 29 | 31 | 32 | 33 | 33 | 32 | 31 | 31 | 29 | 28 | 27 | 26 | 26 | 26 | 25 | 25 | 24 | 24 | 24 | 23 |
| Dewpoint (°C) | 21 | 22 | 22 | 23 | 23 | 23 | 23 | 23 | 24 | 24 | 24 | 24 | 24 | 23 | 23 | 23 | 24 | 23 | 23 | 23 | 23 | 22 | 22 | 22 |
| Heat Index (°C) | 24 | 26 | 32 | 34 | 36 | 37 | 38 | 39 | 37 | 37 | 36 | 33 | 31 | 29 | 26 | 26 | 26 | 25 | 25 | 24 | 24 | 24 | ||
| Surface Wind (mph) | 5 | 5 | 6 | 7 | 7 | 8 | 9 | 10 | 10 | 9 | 9 | 8 | 8 | 6 | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 6 | 6 | 6 |
| Wind Dir | S | S | S | S | S | S | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | W | W | W | W | W | W | W |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 66 | 71 | 79 | 67 | 60 | 51 | 60 | 96 | 95 | 95 | 92 | 92 | 92 | 78 | 78 | 78 | 78 | 78 | 78 | 74 | 72 | 70 | 68 | 62 |
| Precipitation Potential (%) | 11 | 14 | 17 | 20 | 21 | 23 | 16 | 92 | 92 | 92 | 87 | 87 | 87 | 67 | 67 | 67 | 67 | 67 | 67 | 17 | 17 | 17 | 17 | 17 |
| Relative Humidity (%) | 84 | 85 | 79 | 72 | 70 | 63 | 60 | 58 | 60 | 64 | 66 | 68 | 74 | 77 | 82 | 85 | 91 | 88 | 90 | 87 | 90 | 87 | 90 | 93 |
| Rain | -- | -- | SChc | SChc | SChc | SChc | SChc | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | SChc | SChc | SChc | SChc | SChc |
| Thunder | -- | -- | SChc | SChc | SChc | SChc | SChc | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Chc | Chc | Chc | SChc | SChc | SChc | -- | -- | -- | -- | -- |
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