| Point Forecast: Williamstown MA 42.72N 73.2W (Elev. 191 m) |
Last Update: 2:36 pm EDT Aug 11, 2026 |
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| Date | 08/11 | 08/12 | ||||||||||||||||||||||
| Hour (EDT) | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 |
| Temperature (°C) | 28 | 27 | 27 | 26 | 23 | 21 | 20 | 19 | 18 | 17 | 17 | 16 | 15 | 15 | 14 | 15 | 17 | 19 | 23 | 25 | 26 | 27 | 27 | 27 |
| Dewpoint (°C) | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 15 | 15 | 15 | 14 | 14 | 14 | 13 | 13 | 14 | 15 | 16 | 16 | 15 | 15 | 14 | 14 | 15 |
| Heat Index (°C) | 28 | 28 | 27 | 26 | 25 | 26 | 27 | 27 | 27 | |||||||||||||||
| Surface Wind (mph) | 8 | 7 | 6 | 3 | 2 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 3 | 5 | 5 | 5 | 5 |
| Wind Dir | NW | W | W | W | W | W | NW | NW | NW | N | N | N | N | N | N | N | N | NW | NW | NW | NW | NW | NW | NW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 41 | 24 | 32 | 16 | 26 | 34 | 29 | 28 | 47 | 37 | 52 | 62 | 60 | 58 | 52 | 42 | 27 | 10 | 24 | 24 | 42 | 30 | 22 | 13 |
| Precipitation Potential (%) | 0 | 2 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 1 |
| Relative Humidity (%) | 47 | 49 | 51 | 54 | 66 | 71 | 76 | 78 | 81 | 87 | 87 | 90 | 93 | 90 | 96 | 93 | 87 | 78 | 66 | 54 | 52 | 47 | 47 | 49 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 08/13 | |||||||||||||||||||||||
| Hour (EDT) | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 |
| Temperature (°C) | 28 | 27 | 27 | 25 | 22 | 21 | 19 | 18 | 18 | 17 | 17 | 16 | 16 | 16 | 14 | 16 | 17 | 19 | 22 | 24 | 26 | 26 | 26 | 27 |
| Dewpoint (°C) | 14 | 14 | 15 | 16 | 16 | 16 | 16 | 16 | 16 | 15 | 15 | 15 | 14 | 14 | 14 | 15 | 16 | 17 | 17 | 17 | 17 | 17 | 17 | 17 |
| Heat Index (°C) | 28 | 27 | 27 | 25 | 24 | 26 | 26 | 26 | 27 | |||||||||||||||
| Surface Wind (mph) | 6 | 5 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 | 3 | 5 | 6 | 7 | 7 |
| Wind Dir | NW | NW | NW | NW | W | W | W | N | N | N | N | N | N | N | N | W | W | NW | W | W | W | W | W | W |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 21 | 24 | 30 | 21 | 38 | 30 | 35 | 33 | 60 | 55 | 52 | 65 | 75 | 48 | 45 | 34 | 26 | 53 | 42 | 31 | 39 | 46 | 54 | 48 |
| Precipitation Potential (%) | 2 | 2 | 3 | 3 | 10 | 11 | 19 | 18 | 19 | 30 | 23 | 9 | 10 | 12 | 23 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 18 | 18 |
| Relative Humidity (%) | 44 | 47 | 49 | 56 | 68 | 76 | 78 | 84 | 87 | 87 | 87 | 93 | 93 | 93 | 100 | 96 | 93 | 87 | 76 | 66 | 60 | 56 | 56 | 54 |
| Rain | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | Chc | SChc | -- | -- | -- | SChc | -- | -- | -- | -- | -- | -- | -- | SChc | SChc |
| Thunder | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | SChc |
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