Keystone Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Keystone Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Keystone Lake today is 26.1°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 |
|---|---|---|---|
| SEP 14 | 26.6°C | 25.2°C | |
| SEP 15 | 26.3°C | 25.2°C | |
| SEP 16 | 25.8°C | 25.2°C | |
| SEP 17 | 26.2°C | 25.2°C | |
| SEP 18 | 26.5°C | 25.2°C | |
| SEP 19 | 26.3°C | 25.2°C | |
| SEP 20 | 25.9°C | 25.2°C | |
| SEP 21 | 26.1°C | 25.2°C | |
| SEP 22 | 25.2°C | 26.1°C | |
| SEP 23 | 25.2°C | 26.0°C | |
| SEP 24 | 25.2°C | 26.0°C | |
| SEP 25 | 25.2°C | 25.9°C | |
| SEP 26 | 25.2°C | 25.9°C | |
| SEP 27 | 25.2°C | 25.8°C | |
| SEP 28 | 25.2°C | 25.8°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 | 7°C | 13°C |
| March | 2°C | 11°C | 21°C |
| April | 11°C | 16°C | 22°C |
| May | 16°C | 21°C | 27°C |
| June | 18°C | 22°C | 27°C |
| July | 24°C | 28°C | 32°C |
| August | 25°C | 29°C | 33°C |
| September | 21°C | 25°C | 30°C |
| October | 16°C | 20°C | 23°C |
| November | 10°C | 15°C | 19°C |
| December | 3°C | 8°C | 13°C |
Keystone Lake: Water Temperature by Location
Keystone Lake: Weather Forecast
September 21
September 22
September 23
September 24
September 25
Location & Local Information
Keystone Lake in northeastern Oklahoma experiences marked seasonal shifts in water temperature. In winter the surface often falls to roughly 35–50°F (2–10°C). Spring sees a steady rise, with typical readings in the 50–70°F range (10–21°C) as warming progresses. Peak summer temperatures commonly reach about 75–85°F (24–29°C), and during heat waves surface water can climb a few degrees higher. In autumn the lake cools back to roughly 60–75°F (16–24°C) before winter chill sets in. These values are approximate and vary with weather, depth, inflow, and time of day; deeper or shaded areas remain cooler than shallow bays.
Swimming is generally allowed at Keystone Lake’s public recreation areas and designated beaches because the reservoir is managed for multiple recreational uses, including bathing, boating and fishing. However, there are no universally staffed lifeguards across the lake, so swimmers should heed posted signs, obey park rules, and be aware of hazards such as boat traffic, submerged debris and changing water levels. Occasional advisories or temporary closures can occur for water quality issues like algal blooms or bacterial contamination, so checking local park notices before entering the water is recommended for safety.