Lewiston Climate: Weather by Month and Best Time to Visit
Best months for Lewiston: August, July, September, June.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | -1°C | -10°C | 80 mm | 9 | – | – | 3.9 |
| February | 0°C | -9°C | 77 mm | 9 | – | – | 3.9 |
| March | 5°C | -4°C | 97 mm | 10 | – | – | 4.5 |
| April | 11°C | 2°C | 98 mm | 10 | – | – | 5.8 |
| May | 17°C | 8°C | 79 mm | 11 | – | – | 6.9 |
| June | 22°C | 13°C | 94 mm | 11 | – | – | 7.6 |
| July | 26°C | 17°C | 79 mm | 10 | – | – | 7.8 |
| August | 25°C | 16°C | 80 mm | 9 | – | – | 7.9 |
| September | 21°C | 12°C | 87 mm | 9 | – | – | 7.7 |
| October | 14°C | 6°C | 113 mm | 10 | – | – | 6.4 |
| November | 8°C | 1°C | 90 mm | 9 | – | – | 5.4 |
| December | 2°C | -5°C | 104 mm | 10 | – | – | 3.9 |