Longmont Climate: Weather by Month and Best Time to Visit
Best months for Longmont: September, August, June.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 6°C | -7°C | 19 mm | 5 | – | – | 5.3 |
| February | 8°C | -6°C | 20 mm | 5 | – | – | 5.6 |
| March | 14°C | -2°C | 42 mm | 7 | – | – | 6.4 |
| April | 17°C | 2°C | 67 mm | 9 | – | – | 7.0 |
| May | 22°C | 7°C | 87 mm | 12 | – | – | 7.4 |
| June | 28°C | 12°C | 53 mm | 9 | – | – | 7.9 |
| July | 31°C | 15°C | 42 mm | 8 | – | – | 7.6 |
| August | 30°C | 14°C | 39 mm | 7 | – | – | 8.0 |
| September | 26°C | 10°C | 39 mm | 6 | – | – | 8.3 |
| October | 19°C | 3°C | 41 mm | 7 | – | – | 7.7 |
| November | 11°C | -3°C | 28 mm | 6 | – | – | 6.2 |
| December | 6°C | -7°C | 18 mm | 4 | – | – | 5.3 |