April weather forecastSioux City, IA
April
Weather in April
April brings warmer temperatures and longer days to Sioux City, with an average high of 58.6°F (14.8°C) and 13.4 hours of daily daylight. April also carries the highest average wind speed of the year, 11mph (17.7km/h), increasing the chance of local windstorms. The arrival of spring becomes more apparent as relative humidity drops and the amount of rainfall significantly increases to 1.57" (40mm). This period of rebirth in the city presents a natural spectacle as parks and gardens awaken from their winter sleep. Despite the forecasted rainy days, residents often use this time to reacquaint themselves with outdoor activities and local green spaces.Temperature
April brings an increase in the average high-temperature, progressing from a chilly 46.8°F (8.2°C) in March to a refreshing 58.6°F (14.8°C). An average low-temperature of 41.5°F (5.3°C) is noted during the nights in April.Humidity
In Sioux City, the average relative humidity in April is 67%.Rainfall
In Sioux City, in April, it is raining for 11.5 days, with typically 1.57" (40mm) of accumulated precipitation. Throughout the year, there are 102.3 rainfall days, and 12.91" (328mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall. April is the last month it regularly snows. During 1.4 snowfall days, in April, Sioux City aggregates 0.59" (15mm) of snow. In Sioux City, during the entire year, snow falls for 31.1 days and aggregates up to 6.85" (174mm) of snow.Daylight
The average length of the day in April is 13h and 25min.On the first day of the month, sunrise is at 7:06 am and sunset at 7:52 pm. On the last day of April, sunrise is at 6:20 am and sunset at 8:24 pm CDT.
Sunshine
In Sioux City, the average sunshine in April is 8.1h.UV index
In April, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the average person.Note: An average maximum UV index of 4 in April leads to these recommendations:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
Sioux City, IA
- Average high temperature in April: 58.6°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (27°F).
- Average low temperature in April: 41.5°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).
Average pressure in April
Sioux City, IA
- Average pressure in April: 29.92"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in April
Sioux City, IA
- Average wind speed in April: 11mph
The windiest month (with the highest average wind speed) is April (11mph).
The calmest month (with the lowest average wind speed) is July (7.5mph).
Average humidity in April
Sioux City, IA
- Average humidity in April: 67%
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is October (65%).
Average rainfall in April
Sioux City, IA
- Average rainfall in April: 1.57"
The wettest month (with the highest rainfall) is June (1.85").
The driest months (with the least rainfall) are January and February (0.39").
Average rainfall days in April
Sioux City, IA
- Average rainfall days in April: 11.5 days
The month with the highest number of rainy days is June (14.6 days).
The month with the least rainy days is January (2.6 days).
Average snowfall in April
Sioux City, IA
- Average snowfall in April: 0.59"
The month with the highest snowfall is January (1.77").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in April
Sioux City, IA
- Average snowfall days in April: 1.4 days
The month with the highest number of snowfall days is January (8.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in April /
Average sunshine in April
Sioux City, IA
- Average daylight in April: 13h and 24min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in April: 8h and 6min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in April
Sioux City, IA
- Average sunshine days in April: 15.7 days
The month with the most sunshine days is January (22.6 days).
The month with the least sunshine days is June (13.1 days).
Average UV index in April
Sioux City, IA
- Average UV index in April: 4
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in April
Sioux City, IA
- Average cloud cover in April: 43
The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 25).
Average visibility in April
Sioux City, IA
- Average visibility in April: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
