Lake Marsh — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Marsh, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Marsh today is 12.4°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 54°F (12°C) to 60°F (15°C). The water is significantly warmer, and swimming becomes possible for most people. However, caution may still be required for prolonged stays in the water, as extended exposure can cause discomfort. This is a suitable temperature range for short swims and for those accustomed to cooler water. For more comfortable swimming, it is recommended to use proper gear. 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 |
|---|---|---|---|
| OCT 5 | 13.7°C | 11.5°C | |
| OCT 6 | 13.4°C | 11.5°C | |
| OCT 7 | 12.4°C | 11.5°C | |
| OCT 8 | 12.5°C | 11.5°C | |
| OCT 9 | 12.4°C | 11.5°C | |
| OCT 10 | 12.2°C | 11.5°C | |
| OCT 11 | 10.7°C | 11.5°C | |
| OCT 12 | 11.6°C | 11.5°C | |
| OCT 13 | 11.5°C | 12.4°C | |
| OCT 14 | 11.5°C | 12.3°C | |
| OCT 15 | 11.5°C | 12.3°C | |
| OCT 16 | 11.5°C | 12.2°C | |
| OCT 17 | 11.5°C | 12.2°C | |
| OCT 18 | 11.5°C | 12.1°C | |
| OCT 19 | 11.5°C | 12.1°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 | 1°C | 7°C | 12°C |
| February | 1°C | 8°C | 15°C |
| March | 0°C | 9°C | 17°C |
| April | 3°C | 12°C | 20°C |
| May | 7°C | 15°C | 23°C |
| June | 14°C | 20°C | 24°C |
| July | 17°C | 23°C | 29°C |
| August | 19°C | 24°C | 29°C |
| September | 17°C | 21°C | 25°C |
| October | 5°C | 12°C | 18°C |
| November | 2°C | 6°C | 10°C |
| December | 1°C | 5°C | 8°C |
Lake Marsh: Water Temperature by Location
Lake Marsh: Weather Forecast
October 13
October 14
October 15
October 16
October 17
October 18
Location & Local Information
Lake Marsh in South Dakota experiences a wide seasonal range in surface water temperatures typical of prairie lakes. In spring (April–May) surface temperatures commonly climb from roughly 45–60°F (7–16°C) as ice melts and the shallows warm. Peak summer (June–August) temperatures often reach about 68–80°F (20–27°C), and during warm spells can approach the mid-80s°F (around 29°C) in shallow bays. Fall (September–October) brings cooling waters in the neighborhood of 50–65°F (10–18°C), while winter temperatures fall to near freezing, about 32–36°F (0–2°C), with ice cover making open-water conditions unlikely.
Swimming at Lake Marsh is generally possible during the warmer months when the water temperature is comfortable and access points are open, because the lake is used for a variety of recreational activities. Whether swimming is allowed in specific areas depends on local management, posted rules, and current water-quality advisories; blue‑green algae blooms, sudden drop-offs, aquatic vegetation and boat traffic can affect safety. Visitors should check for any signs or advisories before entering the water, choose supervised or designated swimming areas when available, and be cautious in cooler shoulder seasons when water temperatures can cause cold-shock.