April Weather in Alton

Last updated: March 2, 2024

The weather in Alton, United States, during April is characterized by an average temperature of 25°C (78°F). Highs can soar to 39°C (103°F), while lows may dip to 12°C (53°F). Typically, the humidity level in Alton throughout April hovers around 77%.

12°C (53°F)

Minimum temperature

25°C (78°F)

Average temperature

39°C (103°F)

Maximum temperature

77%

Humidity

Precipitation and Sunshine hours

In April, Alton averages 31 mm (1.2 inches) of rainfall, typically over the course of 4 rainy days. The month enjoys an average of 12 hours 47 minutes of daylight, with the sun shining for approximately 9 hours 13 minutes each day. Additionally, there is a 46% probability of sunny days during this period.

31 mm (1.2 inches)

Precipitation

4 rainy days

Rainy days

9 hours 13 minutes

Sunshine hours

46%

Chance of sun

UV Index

In April, the UV Index in Alton 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.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
	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	2	4	7	10	11	11	10	7	4	2	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