| Point Forecast: Washington DC 38.89N 77.02W (Elev. 20 ft) |
Last Update: 10:53 pm EDT Sep 15, 2026 |
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| Date | 09/15 | 09/16 | ||||||||||||||||||||||
| Hour (EDT) | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 |
| Temperature (°F) | 67 | 65 | 64 | 64 | 63 | 63 | 62 | 62 | 61 | 63 | 68 | 74 | 78 | 81 | 83 | 85 | 86 | 86 | 87 | 85 | 83 | 81 | 76 | 75 |
| Dewpoint (°F) | 56 | 57 | 57 | 58 | 59 | 59 | 59 | 59 | 59 | 60 | 61 | 61 | 61 | 61 | 61 | 62 | 62 | 62 | 63 | 62 | 63 | 63 | 63 | 63 |
| Heat Index (°F) | 78 | 82 | 83 | 86 | 86 | 86 | 88 | 86 | 84 | 82 | 76 | 75 | ||||||||||||
| Surface Wind (mph) | 3 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 2 | 2 | 5 | 5 | 5 | 6 | 6 | 6 | 6 | 7 | 7 | 6 | 5 | 3 | 3 |
| Wind Dir | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 4 | 2 | 4 | 9 | 2 | 3 | 4 | 5 | 5 | 2 | 10 | 3 | 12 | 9 | 9 | 14 | 15 | 7 | 20 | 11 | 8 | 12 | 17 | 14 |
| Precipitation Potential (%) | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 1 | 2 | 2 | 2 | 3 | 3 | 3 |
| Relative Humidity (%) | 68 | 75 | 78 | 81 | 87 | 87 | 90 | 90 | 93 | 90 | 78 | 64 | 56 | 51 | 47 | 46 | 45 | 45 | 45 | 46 | 51 | 54 | 64 | 66 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 09/17 | |||||||||||||||||||||||
| Hour (EDT) | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 |
| Temperature (°F) | 73 | 72 | 71 | 70 | 70 | 69 | 68 | 68 | 67 | 69 | 73 | 77 | 81 | 84 | 87 | 88 | 89 | 89 | 88 | 87 | 84 | 82 | 80 | 78 |
| Dewpoint (°F) | 63 | 63 | 63 | 63 | 63 | 63 | 62 | 62 | 62 | 63 | 63 | 63 | 64 | 64 | 65 | 65 | 65 | 66 | 66 | 67 | 67 | 68 | 68 | 68 |
| Heat Index (°F) | 77 | 83 | 85 | 89 | 90 | 91 | 92 | 90 | 90 | 87 | 85 | 83 | 78 | |||||||||||
| Surface Wind (mph) | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 5 | 5 | 6 | 6 | 6 | 7 | 7 | 7 | 6 | 5 | 5 | 3 |
| Wind Dir | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | S | SW | SW | SW | S | S | S | SW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 22 | 27 | 22 | 25 | 30 | 36 | 28 | 34 | 38 | 35 | 44 | 33 | 22 | 25 | 27 | 30 | 33 | 35 | 38 | 42 | 47 | 51 | 54 | 57 |
| Precipitation Potential (%) | 3 | 3 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 8 | 8 | 8 | 8 | 8 | 8 | 26 | 26 | 26 |
| Relative Humidity (%) | 71 | 73 | 76 | 78 | 78 | 81 | 81 | 81 | 84 | 81 | 71 | 62 | 56 | 51 | 48 | 47 | 45 | 47 | 48 | 52 | 57 | 63 | 67 | 71 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | Chc | Chc | Chc |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc |
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