Last updated: June 24, 2025
In Helena Valley Northwest, United States, the average temperature in April hovers around 4°C (39°F). During this month, temperatures can dip as low as -15°C (5°F) and rise to a warm 25°C (78°F). Expect about 59 mm (2.3 in) of precipitation over 11 days, accompanied by an average humidity level of 78%, making for a chilly yet dynamic climate.
In April in Helena Valley Northwest, the average temperature is 4°C (39°F). Maximum temperatures can reach 25°C (78°F), while minimums can drop as low as -15°C (5°F). Be prepared for a wide range of temperatures when traveling during this time.
In Helena Valley Northwest in April, the precipitation amount is 59 mm (2.3 in) over the course of 11 days.
In Helena Valley Northwest in April humidity is 78%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration somewhat uncomfortable and necessitating the need for warm, weatherproof clothing to fully enjoy your travels.
In Helena Valley Northwest in April, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 April’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 |