Helena Climate: Weather by Month and Best Time to Visit
Best months for Helena: August, September, July.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | -2°C | -11°C | 24 mm | 7 | – | – | 4.2 |
| February | 0°C | -10°C | 24 mm | 7 | – | – | 4.1 |
| March | 5°C | -6°C | 37 mm | 9 | – | – | 4.6 |
| April | 10°C | -2°C | 62 mm | 12 | – | – | 5.2 |
| May | 16°C | 3°C | 80 mm | 14 | – | – | 6.2 |
| June | 21°C | 7°C | 96 mm | 14 | – | – | 7.0 |
| July | 27°C | 10°C | 44 mm | 9 | – | – | 7.8 |
| August | 27°C | 10°C | 37 mm | 7 | – | – | 8.1 |
| September | 21°C | 6°C | 41 mm | 7 | – | – | 8.0 |
| October | 12°C | 0°C | 38 mm | 8 | – | – | 6.2 |
| November | 3°C | -6°C | 30 mm | 7 | – | – | 4.6 |
| December | -2°C | -10°C | 27 mm | 7 | – | – | 4.1 |