Lake Yankton — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Yankton, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Yankton today is 22.8°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience. 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 |
|---|---|---|---|
| JUN 3 | 21.5°C | 20.5°C | |
| JUN 4 | 21.4°C | 20.5°C | |
| JUN 5 | 21.3°C | 20.5°C | |
| JUN 6 | 21.7°C | 20.5°C | |
| JUN 7 | 22.9°C | 20.5°C | |
| JUN 8 | 22.9°C | 20.5°C | |
| JUN 10 | 22.8°C | 20.5°C | |
| JUN 11 | 20.5°C | 22.7°C | |
| JUN 12 | 20.5°C | 22.6°C | |
| JUN 13 | 20.5°C | 22.5°C | |
| JUN 14 | 20.5°C | 22.3°C | |
| JUN 15 | 20.5°C | 22.2°C | |
| JUN 16 | 20.5°C | 22.1°C | |
| JUN 17 | 20.5°C | 22.0°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 | 1°C | 4°C |
| February | 1°C | 4°C | 6°C |
| March | 1°C | 5°C | 9°C |
| April | 5°C | 10°C | 14°C |
| May | 11°C | 17°C | 24°C |
| June | 17°C | 21°C | 24°C |
| July | 22°C | 26°C | 29°C |
| August | 21°C | 25°C | 28°C |
| September | 18°C | 20°C | 22°C |
| October | 7°C | 14°C | 21°C |
| November | 3°C | 9°C | 14°C |
| December | 0°C | 2°C | 4°C |
Lake Yankton: Water Temperature by Location
Lake Yankton: Weather Forecast
June 9
June 10
June 11
June 12
June 13
Location & Local Information
Lake Yankton’s water temperatures follow the typical pattern for midwestern reservoirs. In late spring the surface often warms to roughly 50–65°F (10–18°C) as runoff and air temperatures rise; by summer the lake commonly reaches 70–80°F (21–27°C) on warm afternoons, though cooler pockets and wind-driven mixing can keep some areas several degrees lower. In early fall temperatures generally fall back into the 50–65°F (10–18°C) range, and winter brings ice cover and near‑freezing water around 32°F (0°C) beneath the ice. Shallow bays and sheltered areas warm fastest in summer, whereas deeper or wind‑exposed sections stay noticeably cooler.
Swimming at Lake Yankton is permitted during the ice‑free season and is a regular recreational activity at the managed recreation area, which provides access points and a designated beach area. Because the lake is operated as a public recreation site, swimming is allowed when conditions are safe, but users should heed posted advisories. Water quality issues such as elevated bacterial counts or harmful algal blooms, as well as changing currents, debris, or sudden temperature drops, can lead to temporary closures or warnings; checking current local notices and using caution—especially for children and less confident swimmers—is recommended.