Last updated: March 2, 2024
The weather in Alton, United States, during April is characterized by an average temperature of 13°C (56°F). Highs can soar to 28°C (83°F), while lows may dip to -1°C (30°F). Typically, the humidity level in Alton throughout April hovers around 80%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In April, Alton averages 164 mm (6.5 inches) of rainfall, typically over the course of 12 rainy days. The month enjoys an average of 13 hours 9 minutes of daylight, with the sun shining for approximately 8 hours 4 minutes each day. Additionally, there is a 51% probability of sunny days during this period.
Precipitation
Rainy days
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Chance of sun
In April, the UV Index in Alton reaches a maximum of 10, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 15 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 | 1 | 3 | 5 | 7 | 9 | 10 | 9 | 7 | 5 | 3 | 1 | 1 |
| Exposure | Low | Moderate | High | VeryHigh | High | Moderate | Low | ||||||
| Time to burn | 45 min | 30 min | 25 min | 15 min | 25 min | 30 min | 45 min | ||||||