Lake Poinsett — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Poinsett, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Poinsett today is 24.8°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 | 24.0°C | |
| AUG 5 | 25.1°C | 24.0°C | |
| AUG 6 | 24.0°C | 24.0°C | |
| AUG 7 | 24.4°C | 24.0°C | |
| AUG 8 | 24.5°C | 24.0°C | |
| AUG 9 | 24.5°C | 24.0°C | |
| AUG 10 | 24.5°C | 24.0°C | |
| AUG 11 | 24.6°C | 24.0°C | |
| AUG 12 | 24.0°C | 24.8°C | |
| AUG 13 | 24.0°C | 24.7°C | |
| AUG 14 | 24.0°C | 24.7°C | |
| AUG 15 | 24.0°C | 24.6°C | |
| AUG 16 | 24.0°C | 24.6°C | |
| AUG 17 | 24.0°C | 24.6°C | |
| AUG 18 | 24.0°C | 24.5°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 | 1°C | 7°C | 12°C |
| February | 0°C | 8°C | 15°C |
| March | 0°C | 9°C | 17°C |
| April | 2°C | 11°C | 20°C |
| May | 8°C | 15°C | 23°C |
| June | 14°C | 19°C | 24°C |
| July | 17°C | 23°C | 29°C |
| August | 20°C | 24°C | 28°C |
| September | 17°C | 20°C | 22°C |
| October | 5°C | 12°C | 18°C |
| November | 2°C | 6°C | 10°C |
| December | 1°C | 4°C | 7°C |
Lake Poinsett: Water Temperature by Location
Lake Poinsett: Weather Forecast
August 12
August 13
August 14
August 15
August 16
Location & Local Information
Lake Poinsett in northeastern South Dakota experiences a wide annual swing in water temperature. In spring the surface commonly warms from roughly 40–60°F (4–16°C) as air temperatures rise, while early summer sees temperatures climb into the 60s–75°F (16–24°C). Peak summer in July and August often produces the warmest surface readings, typically in the 70–80°F range (21–27°C) on sunny afternoons. By fall the water cools back toward 50–65°F (10–18°C), and in winter the lake surface routinely reaches freezing (32°F/0°C) or below with ice formation; under-ice water temperatures remain near the freshwater density maximum around 34–39°F (1–4°C).
Swimming at Lake Poinsett is generally permitted at public access sites and in areas used for recreation, and most people swim there during the warm summer months when surface temperatures are comfortable. Whether swimming is advisable depends on conditions and local guidance: designated swimming spots and beaches are preferred, and occasional issues such as algae blooms, elevated bacteria levels after heavy runoff, or hazardous weather can prompt advisories or temporary closures. In winter, swimming is not feasible because of ice and very cold water; ice safety should be observed for any on-ice activities. Always consult local authorities or park managers for current water-quality and safety information before entering the water.