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| Point Forecast: Washington-Dulles International Airport VA 38.95N 77.44W (Elev. 285 ft) |
Last Update: 4:47 pm EDT Jul 28, 2021 |
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| Date | 07/28 | 07/29 | ||||||||||||||||||||||
| Hour (EDT) | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 |
| Temperature (°F) | 88 | 85 | 83 | 79 | 77 | 75 | 75 | 73 | 73 | 72 | 71 | 71 | 70 | 71 | 74 | 77 | 79 | 82 | 84 | 86 | 87 | 87 | 85 | 85 |
| Dewpoint (°F) | 62 | 62 | 64 | 65 | 66 | 67 | 67 | 67 | 67 | 68 | 67 | 67 | 68 | 69 | 69 | 69 | 69 | 69 | 69 | 69 | 68 | 68 | 68 | 68 |
| Heat Index (°F) | 88 | 86 | 84 | 79 | 77 | 75 | 75 | 77 | 79 | 85 | 88 | 90 | 91 | 91 | 88 | 88 | ||||||||
| Surface Wind (mph) | 6 | 7 | 6 | 5 | 5 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 6 | 7 | 8 | 8 | 8 | 8 | 8 | 9 |
| Wind Dir | N | N | NE | E | E | E | SE | SE | SE | SE | S | S | S | S | S | SW | SW | SW | SW | SW | SW | SW | S | S |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 58 | 54 | 51 | 48 | 45 | 46 | 47 | 44 | 40 | 41 | 41 | 42 | 46 | 45 | 56 | 57 | 46 | 40 | 42 | 53 | 62 | 66 | 66 | 72 |
| Precipitation Potential (%) | 36 | 36 | 41 | 41 | 41 | 20 | 20 | 20 | 5 | 5 | 5 | 6 | 5 | 2 | 2 | 2 | 2 | 2 | 4 | 7 | 14 | 26 | 32 | 42 |
| Relative Humidity (%) | 41 | 47 | 52 | 62 | 69 | 76 | 76 | 81 | 81 | 87 | 87 | 87 | 93 | 93 | 84 | 76 | 72 | 65 | 61 | 57 | 53 | 53 | 57 | 57 |
| Rain | Chc | Chc | Chc | Chc | Chc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | Chc | Chc | Chc |
| Thunder | Chc | Chc | Chc | Chc | Chc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | Chc | Chc | Chc |
| Fog | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 07/30 | |||||||||||||||||||||||
| Hour (EDT) | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 |
| Temperature (°F) | 84 | 83 | 82 | 80 | 79 | 77 | 76 | 75 | 74 | 73 | 72 | 72 | 72 | 73 | 75 | 77 | 80 | 82 | 84 | 85 | 86 | 87 | 87 | 86 |
| Dewpoint (°F) | 68 | 69 | 69 | 69 | 70 | 70 | 70 | 69 | 69 | 69 | 68 | 68 | 68 | 67 | 67 | 66 | 65 | 64 | 63 | 62 | 61 | 60 | 58 | 57 |
| Heat Index (°F) | 87 | 87 | 85 | 83 | 79 | 77 | 76 | 75 | 75 | 77 | 82 | 83 | 85 | 86 | 86 | 87 | 86 | 85 | ||||||
| Surface Wind (mph) | 8 | 7 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 7 | 8 | 9 | 10 | 13 | 14 | 14 | 14 | 14 | 14 | 14 | 14 |
| Wind Dir | S | S | S | SW | W | W | W | W | W | W | W | W | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW |
| Gust | 18 | 20 | 21 | 21 | 20 | 18 | ||||||||||||||||||
| Sky Cover (%) | 70 | 70 | 77 | 80 | 69 | 69 | 59 | 38 | 19 | 10 | 9 | 13 | 17 | 21 | 23 | 20 | 17 | 15 | 18 | 22 | 25 | 24 | 21 | 19 |
| Precipitation Potential (%) | 38 | 34 | 27 | 27 | 27 | 27 | 27 | 27 | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 3 | 3 | 0 | 0 | 0 | 0 |
| Relative Humidity (%) | 59 | 63 | 65 | 69 | 74 | 79 | 82 | 82 | 84 | 87 | 87 | 87 | 87 | 81 | 76 | 69 | 60 | 55 | 49 | 46 | 43 | 40 | 38 | 37 |
| Rain | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Fog | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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