| Point Forecast: Waltham MA 42.38N 71.24W (Elev. 98 ft) |
Last Update: 4:00 pm EDT Apr 17, 2025 |
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| Date | 04/17 | 04/18 | ||||||||||||||||||||||
| Hour (EDT) | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 |
| Temperature (°F) | 50 | 47 | 44 | 43 | 40 | 38 | 37 | 36 | 34 | 34 | 34 | 34 | 40 | 44 | 51 | 55 | 58 | 61 | 64 | 65 | 65 | 63 | 61 | 59 |
| Dewpoint (°F) | 24 | 24 | 24 | 24 | 24 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 27 | 28 | 29 | 30 | 30 | 31 | 31 |
| Heat Index (°F) | ||||||||||||||||||||||||
| Surface Wind (mph) | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 2 | 3 | 5 | 7 | 9 | 10 | 11 | 13 | 14 | 15 | 14 | 14 |
| Wind Dir | NW | NW | NW | NW | W | W | W | W | W | W | W | W | SW | SW | SW | S | SW | SW | SW | SW | SW | SW | SW | SW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 3 | 15 | 27 | 39 | 20 | 12 | 10 | 10 | 10 | 11 | 9 | 6 | 2 | 2 | 4 | 7 | 15 | 21 | 19 | 24 | 46 | 61 | 77 | 70 |
| Precipitation Potential (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 | 4 | 5 | 6 | 14 |
| Relative Humidity (%) | 35 | 39 | 45 | 48 | 51 | 58 | 61 | 65 | 66 | 71 | 72 | 71 | 57 | 48 | 37 | 32 | 29 | 26 | 25 | 25 | 26 | 29 | 32 | 34 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 04/19 | |||||||||||||||||||||||
| Hour (EDT) | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 |
| Temperature (°F) | 56 | 55 | 55 | 53 | 52 | 53 | 54 | 54 | 54 | 54 | 54 | 54 | 57 | 61 | 65 | 69 | 72 | 74 | 76 | 77 | 78 | 78 | 76 | 74 |
| Dewpoint (°F) | 32 | 33 | 34 | 35 | 37 | 40 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 52 | 53 | 54 | 55 | 55 | 55 | 55 | 56 | 56 | 56 |
| Heat Index (°F) | 76 | 77 | 78 | 78 | 76 | |||||||||||||||||||
| Surface Wind (mph) | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 13 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 13 | 13 | 14 | 14 | 14 | 13 | 13 | 11 | 10 |
| Wind Dir | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW |
| Gust | 21 | 21 | 22 | 22 | 22 | 22 | 23 | 24 | 25 | 25 | 26 | 26 | 25 | 25 | 23 | 21 | ||||||||
| Sky Cover (%) | 53 | 58 | 46 | 34 | 54 | 65 | 76 | 78 | 80 | 82 | 80 | 77 | 75 | 79 | 76 | 72 | 64 | 57 | 49 | 47 | 44 | 41 | 46 | 51 |
| Precipitation Potential (%) | 11 | 12 | 14 | 17 | 20 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 16 | 8 | 7 | 6 | 7 | 8 | 8 | 9 | 10 | 11 | 11 | 12 |
| Relative Humidity (%) | 41 | 42 | 44 | 49 | 53 | 59 | 65 | 68 | 70 | 73 | 77 | 77 | 74 | 67 | 63 | 57 | 53 | 51 | 48 | 47 | 45 | 47 | 50 | 53 |
| Rain | -- | -- | -- | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
