Lewiston Climate: Weather by Month and Best Time to Visit
Best months for Lewiston: September, July, June, August.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 4°C | -4°C | 62 mm | 12 | – | – | 4.1 |
| February | 7°C | -2°C | 52 mm | 11 | – | – | 4.9 |
| March | 12°C | 1°C | 61 mm | 12 | – | – | 5.7 |
| April | 16°C | 4°C | 51 mm | 10 | – | – | 6.8 |
| May | 21°C | 8°C | 48 mm | 9 | – | – | 7.7 |
| June | 24°C | 11°C | 32 mm | 6 | – | – | 8.3 |
| July | 31°C | 15°C | 9 mm | 2 | – | – | 8.4 |
| August | 31°C | 15°C | 10 mm | 2 | – | – | 8.3 |
| September | 26°C | 11°C | 18 mm | 4 | – | – | 8.6 |
| October | 17°C | 5°C | 43 mm | 8 | – | – | 7.2 |
| November | 8°C | 0°C | 64 mm | 12 | – | – | 5.1 |
| December | 3°C | -3°C | 68 mm | 13 | – | – | 3.9 |