Waltham Climate: Weather by Month and Best Time to Visit
Best months for Waltham: September, August, July, June.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 2°C | -6°C | 84 mm | 9 | – | – | 4.1 |
| February | 4°C | -5°C | 77 mm | 9 | – | – | 4.5 |
| March | 8°C | -1°C | 106 mm | 10 | – | – | 5.0 |
| April | 14°C | 5°C | 95 mm | 10 | – | – | 6.4 |
| May | 20°C | 10°C | 78 mm | 11 | – | – | 7.3 |
| June | 25°C | 15°C | 88 mm | 11 | – | – | 7.6 |
| July | 28°C | 18°C | 78 mm | 11 | – | – | 7.7 |
| August | 27°C | 18°C | 86 mm | 10 | – | – | 7.8 |
| September | 23°C | 14°C | 84 mm | 8 | – | – | 8.0 |
| October | 17°C | 8°C | 97 mm | 10 | – | – | 6.8 |
| November | 10°C | 2°C | 86 mm | 9 | – | – | 5.9 |
| December | 5°C | -3°C | 107 mm | 10 | – | – | 4.6 |