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| Point Forecast: Washington-Dulles International Airport VA 38.95N 77.44W (Elev. 87 m) |
Last Update: 10:32 am EDT Jul 28, 2021 |
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| Date | 07/28 | 07/29 | ||||||||||||||||||||||
| Hour (EDT) | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 |
| Temperature (°C) | 30 | 31 | 32 | 33 | 33 | 32 | 31 | 31 | 30 | 28 | 26 | 25 | 24 | 24 | 23 | 23 | 22 | 22 | 22 | 21 | 22 | 23 | 25 | 26 |
| Dewpoint (°C) | 18 | 18 | 17 | 17 | 17 | 17 | 17 | 17 | 18 | 18 | 19 | 19 | 19 | 19 | 19 | 19 | 20 | 19 | 19 | 20 | 21 | 21 | 21 | 21 |
| Heat Index (°C) | 31 | 32 | 32 | 33 | 33 | 32 | 31 | 32 | 31 | 29 | 26 | 25 | 24 | 24 | 25 | 26 | ||||||||
| Surface Wind (mph) | 8 | 8 | 8 | 7 | 7 | 7 | 7 | 7 | 7 | 6 | 5 | 5 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 6 |
| Wind Dir | N | N | N | N | N | N | N | N | NE | NE | E | E | E | SE | SE | SE | SE | S | S | S | S | S | SW | SW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 12 | 14 | 17 | 55 | 55 | 55 | 55 | 55 | 56 | 55 | 51 | 37 | 36 | 38 | 37 | 48 | 38 | 41 | 43 | 48 | 51 | 62 | 62 | 49 |
| Precipitation Potential (%) | 3 | 3 | 3 | 24 | 24 | 24 | 39 | 39 | 39 | 41 | 41 | 41 | 20 | 20 | 20 | 9 | 9 | 9 | 8 | 8 | 8 | 10 | 10 | 10 |
| Relative Humidity (%) | 48 | 45 | 42 | 38 | 38 | 39 | 42 | 43 | 48 | 55 | 64 | 69 | 76 | 76 | 81 | 81 | 87 | 87 | 87 | 93 | 93 | 84 | 76 | 72 |
| Rain | -- | -- | -- | SChc | SChc | SChc | Chc | Chc | Chc | Chc | Chc | Chc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | SChc | SChc | SChc | Chc | Chc | Chc | Chc | Chc | Chc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Fog | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 07/30 | |||||||||||||||||||||||
| Hour (EDT) | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 |
| Temperature (°C) | 28 | 29 | 30 | 31 | 31 | 29 | 29 | 29 | 28 | 28 | 27 | 26 | 25 | 24 | 24 | 23 | 23 | 22 | 22 | 22 | 23 | 24 | 25 | 27 |
| Dewpoint (°C) | 21 | 21 | 21 | 20 | 20 | 20 | 20 | 20 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 20 | 20 | 20 | 19 | 19 | 19 | 18 |
| Heat Index (°C) | 29 | 31 | 32 | 33 | 33 | 31 | 31 | 31 | 31 | 29 | 28 | 26 | 25 | 24 | 24 | 24 | 25 | 28 | ||||||
| Surface Wind (mph) | 7 | 8 | 8 | 8 | 8 | 8 | 9 | 8 | 7 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 7 | 8 | 9 | 10 | 13 |
| Wind Dir | SW | SW | SW | SW | SW | S | S | S | S | S | SW | W | W | W | W | W | W | W | W | NW | NW | NW | NW | NW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 37 | 38 | 55 | 60 | 56 | 70 | 80 | 70 | 68 | 65 | 61 | 54 | 50 | 43 | 29 | 22 | 21 | 18 | 17 | 17 | 16 | 15 | 14 | 11 |
| Precipitation Potential (%) | 21 | 21 | 21 | 58 | 58 | 58 | 64 | 64 | 64 | 51 | 51 | 51 | 36 | 36 | 36 | 20 | 20 | 20 | 14 | 14 | 14 | 0 | 0 | 0 |
| Relative Humidity (%) | 65 | 61 | 57 | 53 | 53 | 57 | 57 | 59 | 63 | 65 | 69 | 74 | 79 | 82 | 82 | 84 | 87 | 87 | 87 | 87 | 81 | 76 | 69 | 60 |
| Rain | SChc | SChc | SChc | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | Chc | Chc | Chc | Chc | Chc | Chc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | Chc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- |
| Fog | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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