Big Sioux River — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in the Big Sioux River, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in the Big Sioux River today is 24.2°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 75°F (23°C) to 79°F (26°C). This is a very comfortable temperature for swimming, and many people can enjoy prolonged stays in the water without feeling cold. The water is pleasantly warm, making it ideal for relaxation and water sports. This temperature range is particularly popular among tourists, as it combines comfort and safety for health. It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.
Water Temperature Chart Over the Last 30 Days
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| AUG 4 | 25.4°C | 21.8°C | |
| AUG 5 | 24.9°C | 21.8°C | |
| AUG 6 | 24.2°C | 21.8°C | |
| AUG 7 | 23.6°C | 21.8°C | |
| AUG 8 | 23.7°C | 21.8°C | |
| AUG 9 | 23.9°C | 21.8°C | |
| AUG 10 | 23.9°C | 21.8°C | |
| AUG 11 | 24.1°C | 21.8°C | |
| AUG 12 | 21.8°C | 24.1°C | |
| AUG 13 | 21.8°C | 24.0°C | |
| AUG 14 | 21.8°C | 23.8°C | |
| AUG 15 | 21.8°C | 23.7°C | |
| AUG 16 | 21.8°C | 23.6°C | |
| AUG 17 | 21.8°C | 23.5°C | |
| AUG 18 | 21.8°C | 23.4°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.
Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts to enhance accuracy.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 0°C | 5°C | 9°C |
| February | 0°C | 5°C | 9°C |
| March | 0°C | 6°C | 11°C |
| April | 4°C | 10°C | 16°C |
| May | 8°C | 13°C | 21°C |
| June | 14°C | 19°C | 24°C |
| July | 17°C | 22°C | 28°C |
| August | 17°C | 22°C | 27°C |
| September | 11°C | 16°C | 21°C |
| October | 8°C | 14°C | 20°C |
| November | 3°C | 8°C | 16°C |
| December | 0°C | 4°C | 8°C |
Big Sioux River: Water Temperature by Location
Big Sioux River: Weather Forecast
August 12
August 13
August 14
August 15
August 16
Location & Local Information
Source Coteau des Prairies
• location Roberts County, South Dakota
Mouth Missouri River
• location Sioux City, Iowa
• coordinates 42.490805°N 96.445490°W
Length 419 mi (674 km)
The Big Sioux River, flowing through South Dakota, Minnesota, and Iowa, is a tributary of the Missouri River that plays a significant role in the region's geography and recreation. Water temperatures in the river fluctuate seasonally, with summer temperatures typically reaching the 70s Fahrenheit (21-26°C) due to warmer air and increased sunlight. In winter, the water temperature drops significantly, often approaching freezing levels, as the river is affected by the harsh Midwest climate.
Swimming in the Big Sioux River is not widely popular, primarily because of the water's quality and flow characteristics. In many areas, the river is shallow, with a silty bottom, and sections may experience periodic issues with pollution from agricultural runoff and urban areas. These factors can impact the safety and appeal of swimming. That said, certain stretches of the river are popular for kayaking, canoeing, and fishing, offering opportunities for outdoor enthusiasts to enjoy the water in other ways.
For those seeking a place to swim, nearby lakes, reservoirs, or designated public swimming spots in the region are often more suitable options. However, the Big Sioux River remains a valuable natural resource, offering scenic views and recreational possibilities beyond traditional swimming activities.