Lake Oahe — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Oahe, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Oahe today is 26.8°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 79°F (26°C) to 82°F (28°C). This is very warm water, allowing for extended stays without any discomfort. Swimming in these conditions will be particularly enjoyable, making it the ideal temperature range for those who want to relax in the sea. Additionally, water in this temperature range is suitable for children and elderly people, as it is comfortable for prolonged stays. 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 | 26.1°C | 24.5°C | |
| AUG 5 | 26.0°C | 24.5°C | |
| AUG 6 | 26.2°C | 24.5°C | |
| AUG 7 | 26.4°C | 24.5°C | |
| AUG 8 | 26.5°C | 24.5°C | |
| AUG 9 | 26.5°C | 24.5°C | |
| AUG 10 | 26.9°C | 24.5°C | |
| AUG 11 | 26.6°C | 24.5°C | |
| AUG 12 | 24.5°C | 26.7°C | |
| AUG 13 | 24.5°C | 26.6°C | |
| AUG 14 | 24.5°C | 26.5°C | |
| AUG 15 | 24.5°C | 26.3°C | |
| AUG 16 | 24.5°C | 26.2°C | |
| AUG 17 | 24.5°C | 26.1°C | |
| AUG 18 | 24.5°C | 26.0°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 | 6°C | 12°C |
| February | 0°C | 8°C | 15°C |
| March | 1°C | 9°C | 17°C |
| April | 3°C | 12°C | 20°C |
| May | 8°C | 15°C | 22°C |
| June | 16°C | 19°C | 23°C |
| July | 17°C | 23°C | 29°C |
| August | 21°C | 25°C | 28°C |
| September | 18°C | 20°C | 22°C |
| October | 5°C | 12°C | 18°C |
| November | 4°C | 7°C | 10°C |
| December | 1°C | 6°C | 11°C |
Lake Oahe: Water Temperature by Location
Lake Oahe: Weather Forecast
August 12
August 13
August 14
August 15
August 16
Location & Local Information
Lake Oahe is a large Missouri River reservoir in South Dakota with surface water temperatures that follow the northern Plains’ seasonal cycle. In spring the lake often runs cool, typically about 40–60°F (4–16°C) as snowmelt and spring runoff dominate. Summer surface temperatures commonly rise into the mid-60s to upper 70s, roughly 65–80°F (18–27°C) in the warmest months, especially in shallow bays and along sandy shorelines. In autumn the water cools again to roughly 50–65°F (10–18°C), and by winter much of the surface approaches freezing, often around 32–40°F (0–4°C) with ice forming in protected coves and shallows.
Swimming is generally permitted at many of Lake Oahe’s designated recreation sites and public beaches because the reservoir is managed for multiuse recreation, but conditions vary and caution is advised. Designated swimming areas may lack lifeguards and water quality or safety advisories can be issued for algal blooms, debris, strong currents near the dam, boat traffic, and sudden drop-offs. Cold water temperatures outside the midsummer window increase hypothermia risk, so swimmers should choose marked areas, heed posted warnings, and be mindful of boat zones and weather-driven waves when deciding to enter the water.