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| Point Forecast: Washington DC 38.89N 77.02W (Elev. 6 m) |
Last Update: 10:31 am EDT Sep 16, 2021 |
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| Date | 09/16 | 09/17 | ||||||||||||||||||||||
| Hour (EDT) | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 |
| Temperature (°C) | 26 | 27 | 27 | 27 | 27 | 27 | 26 | 24 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 22 | 22 | 23 | 24 | 24 |
| Dewpoint (°C) | 21 | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 22 | 22 | 22 | 23 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 21 | 22 | 22 | 22 | 22 |
| Heat Index (°C) | 26 | 28 | 29 | 29 | 29 | 28 | 26 | 24 | 24 | 24 | ||||||||||||||
| Surface Wind (mph) | 6 | 6 | 6 | 6 | 6 | 7 | 6 | 5 | 5 | 3 | 3 | 3 | 2 | 3 | 3 | 3 | 3 | 3 | 3 | 5 | 6 | 6 | 6 | 7 |
| Wind Dir | NE | NE | NE | E | E | E | E | E | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 75 | 78 | 80 | 81 | 86 | 86 | 80 | 80 | 84 | 84 | 81 | 90 | 89 | 87 | 90 | 84 | 79 | 85 | 87 | 81 | 82 | 82 | 82 | 72 |
| Precipitation Potential (%) | 13 | 13 | 19 | 32 | 46 | 52 | 44 | 39 | 18 | 15 | 9 | 7 | 6 | 4 | 4 | 4 | 5 | 6 | 8 | 8 | 24 | 24 | 24 | 24 |
| Relative Humidity (%) | 74 | 74 | 72 | 72 | 69 | 72 | 76 | 79 | 90 | 93 | 93 | 100 | 97 | 97 | 97 | 97 | 97 | 97 | 100 | 93 | 97 | 97 | 90 | 87 |
| Rain | -- | -- | SChc | Chc | Chc | Chc | Chc | Chc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | SChc |
| Thunder | -- | -- | SChc | Chc | Chc | Chc | Chc | Chc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc |
| Date | 09/18 | |||||||||||||||||||||||
| Hour (EDT) | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 |
| Temperature (°C) | 26 | 26 | 26 | 27 | 27 | 26 | 25 | 24 | 23 | 23 | 22 | 22 | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 21 | 21 | 22 | 24 | 26 |
| Dewpoint (°C) | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 21 | 21 | 21 | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 |
| Heat Index (°C) | 26 | 26 | 26 | 28 | 28 | 26 | 25 | 24 | 24 | 26 | ||||||||||||||
| Surface Wind (mph) | 7 | 7 | 7 | 7 | 6 | 6 | 6 | 5 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 5 |
| Wind Dir | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | N | N | N | N | N | N | N | N | N | N |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 67 | 63 | 65 | 57 | 52 | 58 | 36 | 39 | 42 | 43 | 44 | 44 | 45 | 46 | 46 | 46 | 47 | 47 | 46 | 43 | 42 | 38 | 29 | 25 |
| Precipitation Potential (%) | 24 | 24 | 38 | 38 | 38 | 38 | 38 | 38 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 12 |
| Relative Humidity (%) | 79 | 79 | 79 | 74 | 74 | 77 | 82 | 82 | 87 | 90 | 97 | 97 | 97 | 97 | 97 | 100 | 100 | 100 | 100 | 100 | 97 | 90 | 84 | 76 |
| Rain | SChc | SChc | Chc | Chc | Chc | Chc | Chc | Chc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | SChc | SChc | Chc | Chc | Chc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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