| Point Forecast: Rockville MD 39.08N 77.16W (Elev. 430 ft) |
Last Update: 7:54 am EDT Sep 16, 2026 |
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| Date | 09/16 | 09/17 | ||||||||||||||||||||||
| Hour (EDT) | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 |
| Temperature (°F) | 62 | 65 | 72 | 76 | 78 | 81 | 82 | 84 | 84 | 84 | 82 | 81 | 78 | 74 | 72 | 71 | 70 | 69 | 68 | 68 | 67 | 67 | 66 | 65 |
| Dewpoint (°F) | 59 | 60 | 60 | 61 | 61 | 61 | 61 | 62 | 62 | 62 | 63 | 63 | 63 | 63 | 64 | 64 | 64 | 63 | 63 | 63 | 63 | 63 | 63 | 62 |
| Heat Index (°F) | 76 | 78 | 82 | 83 | 85 | 85 | 85 | 83 | 82 | 78 | ||||||||||||||
| Surface Wind (mph) | 2 | 3 | 5 | 5 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 3 | 3 | 3 | 3 | 3 | 2 | 3 | 3 | 3 | 3 |
| Wind Dir | SE | 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 (%) | 15 | 20 | 17 | 17 | 12 | 7 | 12 | 10 | 19 | 25 | 8 | 8 | 13 | 19 | 24 | 29 | 29 | 37 | 44 | 47 | 40 | 45 | 47 | 43 |
| Precipitation Potential (%) | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 3 | 0 | 4 |
| Relative Humidity (%) | 90 | 84 | 66 | 60 | 56 | 51 | 49 | 48 | 48 | 48 | 53 | 54 | 60 | 69 | 76 | 79 | 81 | 81 | 84 | 84 | 87 | 87 | 90 | 90 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 09/18 | |||||||||||||||||||||||
| Hour (EDT) | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 |
| Temperature (°F) | 67 | 70 | 75 | 79 | 81 | 84 | 85 | 86 | 87 | 85 | 85 | 83 | 78 | 77 | 76 | 75 | 74 | 73 | 72 | 71 | 71 | 71 | 70 | 70 |
| Dewpoint (°F) | 63 | 65 | 66 | 67 | 68 | 68 | 69 | 70 | 70 | 71 | 71 | 71 | 71 | 70 | 70 | 70 | 70 | 70 | 70 | 70 | 70 | 70 | 70 | 70 |
| Heat Index (°F) | 75 | 79 | 84 | 87 | 89 | 91 | 92 | 90 | 90 | 88 | 78 | 77 | 76 | 75 | ||||||||||
| Surface Wind (mph) | 3 | 3 | 3 | 5 | 5 | 6 | 6 | 6 | 6 | 6 | 6 | 5 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 5 | 5 |
| Wind Dir | S | S | S | S | S | S | S | S | S | S | S | S | S | S | SW | SW | SW | W | W | W | NW | NW | NW | NW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 43 | 58 | 41 | 34 | 47 | 51 | 46 | 21 | 33 | 46 | 29 | 58 | 77 | 72 | 67 | 61 | 61 | 61 | 59 | 57 | 54 | 52 | 51 | 49 |
| Precipitation Potential (%) | 21 | 20 | 1 | 4 | 3 | 12 | 2 | 4 | 17 | 10 | 14 | 37 | 41 | 41 | 41 | 41 | 41 | 41 | 4 | 4 | 4 | 4 | 4 | 4 |
| Relative Humidity (%) | 87 | 84 | 74 | 67 | 65 | 59 | 59 | 59 | 57 | 63 | 63 | 67 | 79 | 79 | 82 | 84 | 87 | 90 | 93 | 97 | 97 | 97 | 100 | 100 |
| Rain | SChc | SChc | -- | -- | -- | -- | -- | -- | SChc | -- | -- | Chc | Chc | Chc | Chc | Chc | Chc | Chc | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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