Last updated: March 2, 2024
The weather in Helena, United States, during April is characterized by an average temperature of 20°C (68°F). Highs can soar to 29°C (84°F), while lows may dip to 7°C (44°F). Typically, the humidity level in Helena throughout April hovers around 78%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In April, Helena averages 120 mm (4.7 inches) of rainfall, typically over the course of 10 rainy days. The month enjoys an average of 12 hours 55 minutes of daylight, with the sun shining for approximately 9 hours 45 minutes each day. Additionally, there is a 51% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In April, the UV Index in Helena reaches a maximum of 11, indicating a level of Extreme exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 10 minutes.
| 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UVI | 1 | 2 | 4 | 6 | 9 | 10 | 11 | 9 | 7 | 5 | 2 | 1 | 1 |
| Exposure | Low | Moderate | High | VeryHigh | Extreme | VeryHigh | High | Moderate | Low | ||||
| Time to burn | 45 min | 30 min | 25 min | 15 min | 10 min | 15 min | 25 min | 30 min | 45 min | ||||