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Weather in Sioux City
Average Weather
| Month | Average monthly max temperature | Average monthly min temperature |
| January | -1°C | -10°C |
| February | 0°C | -8°C |
| March | 9°C | 0°C |
| April | 15°C | 4°C |
| May | 21°C | 11°C |
| June | 27°C | 17°C |
| July | 29°C | 18°C |
| August | 29°C | 17°C |
| September | 26°C | 13°C |
| October | 17°C | 6°C |
| November | 9°C | 0°C |
| December | 1°C | -6°C |
14 day forecast
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