| Point Forecast: Waltham MA 42.38N 71.24W (Elev. 30 m) |
Last Update: 6:05 pm EDT Jul 13, 2025 |
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| Date | 07/13 | 07/14 | ||||||||||||||||||||||
| Hour (EDT) | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 |
| Temperature (°C) | 22 | 21 | 21 | 21 | 21 | 21 | 20 | 20 | 20 | 21 | 22 | 23 | 24 | 26 | 27 | 28 | 28 | 29 | 28 | 28 | 28 | 27 | 26 | 25 |
| Dewpoint (°C) | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 20 | 21 | 21 | 21 | 21 | 21 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 |
| Heat Index (°C) | 24 | 26 | 28 | 30 | 31 | 32 | 31 | 31 | 31 | 28 | 26 | 25 | ||||||||||||
| Surface Wind (mph) | 6 | 5 | 5 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 5 | 5 | 6 | 6 | 6 | 7 | 6 | 7 | 6 | 6 | 6 | 6 | 5 |
| Wind Dir | S | S | S | S | S | S | S | S | S | S | S | S | S | S | SW | S | S | SW | S | S | SW | SW | SW | S |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 64 | 88 | 93 | 90 | 93 | 94 | 95 | 93 | 94 | 95 | 85 | 89 | 70 | 70 | 70 | 63 | 62 | 57 | 56 | 63 | 54 | 54 | 64 | 78 |
| Precipitation Potential (%) | 2 | 2 | 2 | 3 | 3 | 4 | 4 | 5 | 6 | 6 | 7 | 6 | 5 | 4 | 9 | 14 | 19 | 24 | 28 | 33 | 32 | 32 | 32 | 29 |
| Relative Humidity (%) | 84 | 90 | 90 | 93 | 93 | 90 | 93 | 93 | 97 | 90 | 90 | 87 | 84 | 76 | 72 | 67 | 67 | 67 | 67 | 70 | 72 | 74 | 77 | 85 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | SChc | Chc | Chc | Chc | Chc | Chc | Chc |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | SChc | Chc | Chc | Chc | Chc | SChc | SChc |
| Date | 07/15 | |||||||||||||||||||||||
| Hour (EDT) | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 |
| Temperature (°C) | 24 | 24 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 23 | 23 | 24 | 26 | 28 | 29 | 29 | 30 | 31 | 31 | 30 | 29 | 29 | 28 | 27 |
| Dewpoint (°C) | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 21 | 22 | 22 | 22 | 22 | 23 | 23 | 23 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 22 | 22 |
| Heat Index (°C) | 24 | 24 | 24 | 28 | 31 | 32 | 33 | 34 | 34 | 34 | 33 | 33 | 32 | 31 | 29 | |||||||||
| Surface Wind (mph) | 5 | 5 | 5 | 5 | 5 | 5 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 5 | 5 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 5 |
| Wind Dir | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | W | W | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 81 | 84 | 81 | 80 | 78 | 80 | 81 | 82 | 81 | 79 | 78 | 68 | 59 | 50 | 45 | 41 | 36 | 35 | 33 | 32 | 30 | 27 | 25 | 25 |
| Precipitation Potential (%) | 26 | 23 | 22 | 20 | 18 | 19 | 19 | 20 | 20 | 20 | 20 | 20 | 20 | 19 | 19 | 18 | 18 | 17 | 17 | 17 | 14 | 12 | 10 | 8 |
| Relative Humidity (%) | 85 | 87 | 89 | 90 | 90 | 92 | 93 | 93 | 95 | 95 | 93 | 87 | 80 | 74 | 70 | 67 | 65 | 64 | 63 | 63 | 65 | 68 | 72 | 77 |
| Rain | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc | -- | -- | -- | -- |
| Thunder | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | SChc | -- | -- | -- | -- |
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