Last updated: June 24, 2025
In April, the average temperature in Sioux City, United States hovers around 9°C (48°F). Temperature extremes can vary dramatically, with a minimum of -11°C (12°F) and a maximum reaching 29°C (85°F). Expect around 80 mm (3.2 in) of precipitation spread over 11 days, and enjoy a cozy average humidity of 79%.
In April in Sioux City, the average temperature is 9°C (48°F). The maximum can reach 29°C (85°F), while the minimum can drop as low as -11°C (12°F). Visitors should be prepared for a wide range of temperatures and pack accordingly for both warm days and chilly nights.
In Sioux City in April, the precipitation amount is 80 mm (3.2 in) spread over 11 days.
In Sioux City in April humidity is 79%. With an average temperature of 9°C (48°F), this humidity feels like a chilly mist wrapping around you, making outdoor activities brisk yet invigorating, but it can also leave you feeling damp and slightly chilled if you're not dressed appropriately for the conditions.
In Sioux City 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 Sioux City.
UV Risk Categories
Weather in Sioux City varies notably across the year, with each month offering distinct climate conditions. This page compares April’s weather to other months in Sioux City, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -5°C (23°F) | 28 mm (1.1 inches) | 80% | moderate |
| February Weather | -5°C (23°F) | 29 mm (1.2 inches) | 84% | moderate |
| March Weather | 3°C (38°F) | 81 mm (3.2 inches) | 75% | moderate |
| April Weather | 9°C (48°F) | 80 mm (3.2 inches) | 79% | very high |
| May Weather | 16°C (61°F) | 140 mm (5.5 inches) | 74% | very high |
| June Weather | 23°C (74°F) | 102 mm (4.0 inches) | 81% | extreme |
| July Weather | 25°C (77°F) | 66 mm (2.6 inches) | 82% | very high |
| August Weather | 23°C (73°F) | 109 mm (4.3 inches) | 80% | very high |
| September Weather | 20°C (68°F) | 101 mm (4.0 inches) | 75% | very high |
| October Weather | 10°C (51°F) | 77 mm (3.0 inches) | 77% | moderate |
| November Weather | 3°C (38°F) | 27 mm (1.0 inches) | 85% | moderate |
| December Weather | -2°C (29°F) | 41 mm (1.6 inches) | 83% | low |