Last updated: June 24, 2025
In October, the average temperature in Helena Valley Northwest, United States hovers around 5°C (41°F). Expect a chilly low of -19°C (-2°F) and a surprising high of 28°C (82°F). With 35 mm (1.4 in) of precipitation over 8 days, don’t forget your umbrella! The air remains fairly humid, with an average humidity level of 72%.
In October in Helena Valley Northwest, the average temperature is 5°C (41°F), with maximums reaching 28°C (82°F) and minimums dropping as low as -19°C (-2°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both warm and cold conditions.
In Helena Valley Northwest in October, the precipitation amount is 35 mm (1.4 in) over the course of 8 days.
In Helena Valley Northwest in October humidity is 72%. With an average temperature of 5°C (41°F), this humidity feels like a chilly, damp embrace that can make outdoor adventures quite uncomfortable, as the cold air coupled with the high moisture in the atmosphere seeps into your bones, leaving you longing for warmth and cozy indoor activities.
In Helena Valley Northwest in October, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Helena Valley Northwest.
UV Risk Categories
Weather in Helena Valley Northwest varies notably across the year, with each month offering distinct climate conditions. This page compares October’s weather to other months in Helena Valley Northwest, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (22°F) | 19 mm (0.7 inches) | 87% | moderate |
| February Weather | -8°C (18°F) | 44 mm (1.7 inches) | 88% | moderate |
| March Weather | -1°C (31°F) | 30 mm (1.2 inches) | 83% | high |
| April Weather | 4°C (39°F) | 59 mm (2.3 inches) | 78% | very high |
| May Weather | 10°C (51°F) | 64 mm (2.5 inches) | 76% | very high |
| June Weather | 16°C (60°F) | 78 mm (3.1 inches) | 78% | very high |
| July Weather | 21°C (69°F) | 17 mm (0.7 inches) | 77% | very high |
| August Weather | 20°C (67°F) | 23 mm (0.9 inches) | 71% | very high |
| September Weather | 14°C (57°F) | 37 mm (1.5 inches) | 68% | very high |
| October Weather | 5°C (41°F) | 35 mm (1.4 inches) | 72% | moderate |
| November Weather | 0°C (32°F) | 29 mm (1.1 inches) | 84% | moderate |
| December Weather | -4°C (25°F) | 30 mm (1.2 inches) | 90% | low |