Great Falls Climate: Weather by Month and Best Time to Visit
Best months for Great Falls: August, September, July.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 1°C | -7°C | 20 mm | 6 | – | – | 4.4 |
| February | 3°C | -7°C | 19 mm | 6 | – | – | 4.8 |
| March | 9°C | -3°C | 26 mm | 7 | – | – | 5.7 |
| April | 14°C | 2°C | 52 mm | 9 | – | – | 6.5 |
| May | 20°C | 6°C | 61 mm | 11 | – | – | 7.3 |
| June | 24°C | 10°C | 73 mm | 10 | – | – | 7.7 |
| July | 30°C | 14°C | 24 mm | 5 | – | – | 8.1 |
| August | 30°C | 13°C | 28 mm | 5 | – | – | 8.3 |
| September | 23°C | 9°C | 36 mm | 6 | – | – | 8.3 |
| October | 15°C | 3°C | 34 mm | 6 | – | – | 7.1 |
| November | 7°C | -2°C | 23 mm | 6 | – | – | 5.6 |
| December | 1°C | -6°C | 21 mm | 6 | – | – | 4.5 |