| Point Forecast: Reston VA 38.97N 77.36W (Elev. 430 ft) |
Last Update: 4:53 am EDT May 19, 2026 |
 |
|
[show menu] |
| Date | 05/19 | 05/20 | ||||||||||||||||||||||
| Hour (EDT) | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 |
| Temperature (°F) | 72 | 73 | 74 | 79 | 85 | 88 | 92 | 95 | 95 | 97 | 96 | 95 | 94 | 93 | 90 | 87 | 85 | 82 | 81 | 80 | 78 | 77 | 75 | 74 |
| Dewpoint (°F) | 61 | 61 | 62 | 63 | 63 | 63 | 63 | 62 | 61 | 61 | 61 | 61 | 61 | 62 | 62 | 62 | 62 | 61 | 61 | 61 | 61 | 61 | 60 | 59 |
| Heat Index (°F) | 79 | 86 | 89 | 93 | 96 | 95 | 98 | 97 | 95 | 94 | 94 | 90 | 87 | 86 | 83 | 82 | 81 | 78 | 77 | 75 | ||||
| Surface Wind (mph) | 7 | 7 | 6 | 6 | 7 | 8 | 7 | 7 | 8 | 8 | 8 | 9 | 8 | 7 | 6 | 6 | 5 | 6 | 7 | 7 | 7 | 7 | 6 | 6 |
| Wind Dir | SW | SW | SW | W | W | W | W | W | W | SW | SW | SW | SW | SW | S | S | S | S | SW | S | SW | SW | SW | SW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 33 | 28 | 19 | 20 | 22 | 23 | 24 | 25 | 29 | 37 | 54 | 68 | 64 | 63 | 61 | 56 | 39 | 46 | 44 | 39 | 34 | 31 | 25 | 18 |
| Precipitation Potential (%) | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 4 | 10 | 17 | 15 | 10 | 10 | 8 | 6 | 5 | 5 | 5 | 5 | 2 | 2 | 2 | 2 |
| Relative Humidity (%) | 68 | 66 | 66 | 58 | 48 | 43 | 38 | 34 | 33 | 31 | 32 | 33 | 34 | 36 | 39 | 43 | 46 | 49 | 51 | 52 | 56 | 58 | 60 | 59 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 05/21 | |||||||||||||||||||||||
| Hour (EDT) | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 |
| Temperature (°F) | 73 | 72 | 75 | 79 | 84 | 89 | 91 | 93 | 95 | 94 | 92 | 89 | 85 | 82 | 79 | 77 | 75 | 74 | 72 | 71 | 69 | 67 | 65 | 64 |
| Dewpoint (°F) | 59 | 60 | 61 | 63 | 63 | 64 | 63 | 63 | 62 | 63 | 64 | 66 | 67 | 69 | 69 | 68 | 67 | 67 | 66 | 65 | 63 | 61 | 59 | 57 |
| Heat Index (°F) | 75 | 79 | 85 | 90 | 92 | 94 | 96 | 95 | 94 | 92 | 88 | 85 | 79 | 77 | 75 | |||||||||
| Surface Wind (mph) | 5 | 3 | 3 | 3 | 5 | 5 | 6 | 7 | 8 | 9 | 10 | 10 | 10 | 10 | 9 | 7 | 7 | 7 | 7 | 8 | 8 | 9 | 9 | 10 |
| Wind Dir | SW | SW | W | W | W | W | W | W | W | W | W | NW | NW | NW | N | N | N | N | N | N | N | N | N | N |
| Gust | 18 | 18 | 20 | |||||||||||||||||||||
| Sky Cover (%) | 19 | 18 | 8 | 5 | 12 | 18 | 14 | 55 | 75 | 77 | 78 | 88 | 88 | 88 | 87 | 91 | 89 | 87 | 87 | 87 | 67 | 67 | 68 | 68 |
| Precipitation Potential (%) | 1 | 1 | 3 | 3 | 3 | 3 | 3 | 33 | 62 | 65 | 67 | 82 | 81 | 81 | 80 | 80 | 80 | 80 | 80 | 80 | 51 | 51 | 51 | 51 |
| Relative Humidity (%) | 62 | 66 | 62 | 58 | 49 | 44 | 40 | 37 | 34 | 36 | 40 | 47 | 55 | 65 | 72 | 74 | 76 | 79 | 81 | 81 | 81 | 81 | 81 | 78 |
| Rain | -- | -- | -- | -- | -- | -- | -- | Chc | Lkly | Lkly | Lkly | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Ocnl | Chc | Chc | Chc | Chc |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | Chc | Chc | Chc | Chc | Chc | Chc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- |
| ||||||||||||