Lake Francis Case — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Francis Case, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Francis Case today is 24.9°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 26 | 24.0°C | 26.5°C | |
| AUG 27 | 24.1°C | 26.5°C | |
| AUG 28 | 23.9°C | 26.5°C | |
| AUG 29 | 24.5°C | 26.5°C | |
| AUG 30 | 24.6°C | 26.5°C | |
| AUG 31 | 24.7°C | 26.5°C | |
| SEP 1 | 25.5°C | 22.5°C | |
| SEP 2 | 24.9°C | 22.5°C | |
| SEP 3 | 22.5°C | 24.8°C | |
| SEP 4 | 22.5°C | 24.7°C | |
| SEP 5 | 22.5°C | 24.5°C | |
| SEP 6 | 22.5°C | 24.4°C | |
| SEP 7 | 22.5°C | 24.3°C | |
| SEP 8 | 22.5°C | 24.2°C | |
| SEP 9 | 22.5°C | 24.1°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 | 2°C | 4°C |
| February | 0°C | 5°C | 10°C |
| March | 0°C | 5°C | 9°C |
| April | 4°C | 9°C | 13°C |
| May | 9°C | 16°C | 23°C |
| June | 15°C | 20°C | 25°C |
| July | 20°C | 27°C | 33°C |
| August | 23°C | 27°C | 30°C |
| September | 19°C | 23°C | 26°C |
| October | 13°C | 17°C | 20°C |
| November | 4°C | 9°C | 13°C |
| December | 1°C | 5°C | 9°C |
Lake Francis Case: Water Temperature by Location
Lake Francis Case: Weather Forecast
September 3
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September 5
September 6
September 7
Location & Local Information
Lake Francis Case, a large Missouri River reservoir in South Dakota, experiences pronounced seasonal water temperature changes. In summer the surface often warms into the low 70s to low 80s °F (about 21–28 °C), with shallow bays sometimes reaching the upper 70s to mid‑80s °F (25–29 °C) during heat waves. Spring and early summer see much cooler conditions, commonly in the 40s to mid‑60s °F (4–18 °C) as snowmelt and inflow dominate, while autumn brings a steady decline into the 50s to low 60s °F (10–17 °C) before winter ice forms. Winter surface temperatures hover near freezing, about 32–39 °F (0–4 °C), and deeper water remains colder year‑round, so thermal layering and cold water pockets can be significant even during warm months.
Swimming at Lake Francis Case is generally permitted, especially at designated recreation areas and beaches managed by local authorities and the U.S. Army Corps of Engineers, but conditions and rules vary by site. People commonly swim in summer when surface temperatures are comfortable, yet swimmers should be aware of hazards such as boat traffic, sudden drop‑offs, submerged structures, strong currents near dam and inlet areas, and the absence of lifeguards at many spots. Water quality and occasional algal or debris issues can prompt advisories, so checking local notices and using caution—particularly to avoid cold‑water shock in cooler seasons—is recommended.