Copan Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Copan Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Copan Lake today is 22.3°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 |
|---|---|---|---|
| SEP 21 | 23.9°C | 25.5°C | |
| SEP 22 | 24.5°C | 25.5°C | |
| SEP 23 | 24.2°C | 25.5°C | |
| SEP 24 | 23.8°C | 25.5°C | |
| SEP 25 | 22.9°C | 25.5°C | |
| SEP 26 | 23.1°C | 25.5°C | |
| SEP 27 | 22.9°C | 25.5°C | |
| SEP 28 | 22.2°C | 25.5°C | |
| SEP 29 | 25.5°C | 22.2°C | |
| SEP 30 | 25.5°C | 22.0°C | |
| OCT 1 | 19.5°C | 21.9°C | |
| OCT 2 | 19.5°C | 21.7°C | |
| OCT 3 | 19.5°C | 21.6°C | |
| OCT 4 | 19.5°C | 21.5°C | |
| OCT 5 | 19.5°C | 21.3°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 | 2°C | 6°C | 11°C |
| February | 1°C | 5°C | 10°C |
| March | 2°C | 10°C | 18°C |
| April | 11°C | 16°C | 21°C |
| May | 16°C | 20°C | 25°C |
| June | 20°C | 23°C | 27°C |
| July | 25°C | 29°C | 32°C |
| August | 25°C | 28°C | 32°C |
| September | 21°C | 26°C | 30°C |
| October | 16°C | 20°C | 23°C |
| November | 9°C | 14°C | 18°C |
| December | 3°C | 7°C | 11°C |
Copan Lake: Water Temperature by Location
Copan Lake: Weather Forecast
September 30
October 1
October 2
October 3
October 4
Location & Local Information
Copan Lake in northeastern Oklahoma experiences noticeable seasonal swings in water temperature typical of inland reservoirs. During winter the surface often cools to roughly 35–50°F (2–10°C). Spring sees a steady rise as waters warm into the 50–70°F range (10–21°C). Peak summer temperatures commonly reach about 75–90°F (24–32°C) in shallower, sun-exposed coves, while early fall typically brings cooling back into the 60–75°F band (15–24°C). Local conditions such as recent weather, depth, and inflow from tributaries can shift these numbers, with deeper basins staying cooler and shallow bays heating faster on hot, calm days.
Swimming at Copan Lake is generally permitted and the lake is used for recreational bathing by locals, but there are caveats. There are few if any supervised swim beaches and lifeguards are not provided, so swimming is at visitors’ own risk. Water levels, sudden drop-offs, submerged hazards, boat traffic and occasional water-quality advisories can affect safety and suitability for swimming, so it’s important to follow posted signs and any guidance from the managing agency or local authorities. Many people choose to swim in sheltered coves during warm months when surface temperatures are most comfortable.