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 20.6°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 | 18.5°C | 19.0°C | |
| JUN 4 | 18.5°C | 19.0°C | |
| JUN 5 | 19.3°C | 19.0°C | |
| JUN 6 | 19.7°C | 19.0°C | |
| JUN 7 | 19.7°C | 19.0°C | |
| JUN 8 | 19.8°C | 19.0°C | |
| JUN 10 | 20.6°C | 19.0°C | |
| JUN 11 | 19.0°C | 20.5°C | |
| JUN 12 | 19.0°C | 20.4°C | |
| JUN 13 | 19.0°C | 20.4°C | |
| JUN 14 | 19.0°C | 20.3°C | |
| JUN 15 | 19.0°C | 20.2°C | |
| JUN 16 | 19.0°C | 20.1°C | |
| JUN 17 | 19.0°C | 20.0°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 | 1°C | 7°C | 12°C |
| February | 1°C | 8°C | 15°C |
| March | 1°C | 9°C | 17°C |
| April | 3°C | 12°C | 20°C |
| May | 7°C | 14°C | 21°C |
| June | 16°C | 19°C | 22°C |
| July | 17°C | 21°C | 24°C |
| August | 22°C | 25°C | 28°C |
| September | 16°C | 19°C | 22°C |
| October | 5°C | 11°C | 16°C |
| November | 4°C | 7°C | 9°C |
| December | 1°C | 5°C | 8°C |
Lake Oahe: Water Temperature by Location
Lake Oahe: Weather Forecast
June 9
June 10
June 11
June 12
June 13
Location & Local Information
Lake Oahe, a large Missouri River reservoir that extends into central North Dakota, experiences pronounced seasonal changes in surface water temperature. In winter the lake is commonly at or below freezing, roughly 25–35°F (−4 to 2°C) where ice forms in many bays and shallow areas. Spring sees a gradual rise to about 35–55°F (2–13°C) as snowmelt and runoff cool the surface. By summer the surface typically reaches the warmest values, commonly in the range of 70–80°F (21–27°C) in mid-late summer and occasionally climbing a few degrees higher in sheltered shallows on hot spells. During fall the water cools again, generally falling into the 45–65°F (7–18°C) range before ice return.
Swimming is permitted in many designated recreation areas and public beaches around Lake Oahe because it is managed for multiple recreational uses, but there are practical and safety considerations. Lifeguards are infrequent, boat traffic, wind-driven waves, sudden drop-offs and cold-water shock near deeper channels or after storms all create hazards; areas near the dam or navigation channels may be restricted. Water quality advisories or seasonal closures can occur, so swimmers should choose marked beaches, heed local signage, and be mindful that even in summer deeper or shaded water can still be cool enough to increase risk of hypothermia.