Knox Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Knox Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Knox Lake today is 21.2°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 | 18.3°C | 21.0°C | |
| JUN 4 | 18.6°C | 21.0°C | |
| JUN 5 | 19.3°C | 21.0°C | |
| JUN 6 | 20.2°C | 21.0°C | |
| JUN 7 | 20.8°C | 21.0°C | |
| JUN 8 | 20.8°C | 21.0°C | |
| JUN 10 | 21.2°C | 21.0°C | |
| JUN 11 | 21.0°C | 21.2°C | |
| JUN 12 | 21.0°C | 21.2°C | |
| JUN 13 | 21.0°C | 21.2°C | |
| JUN 14 | 21.0°C | 21.2°C | |
| JUN 15 | 21.0°C | 21.2°C | |
| JUN 16 | 21.0°C | 21.1°C | |
| JUN 17 | 21.0°C | 21.1°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 | 0°C | 3°C | 6°C |
| February | 0°C | 3°C | 5°C |
| March | 2°C | 5°C | 8°C |
| April | 6°C | 11°C | 17°C |
| May | 11°C | 15°C | 20°C |
| June | 17°C | 21°C | 25°C |
| July | 22°C | 26°C | 29°C |
| August | 21°C | 25°C | 28°C |
| September | 20°C | 25°C | 29°C |
| October | 15°C | 19°C | 22°C |
| November | 6°C | 11°C | 16°C |
| December | 0°C | 4°C | 7°C |
Knox Lake: Water Temperature by Location
Knox Lake: Weather Forecast
June 9
June 10
June 11
June 12
June 13
Location & Local Information
Knox Lake in Ohio typically follows the seasonal patterns of small inland Midwestern lakes. Surface temperatures in winter often hover just above freezing, about 33–40°F (1–4°C), with ice common some years. In spring the water warms from roughly 45–60°F (7–16°C) as runoff and air temperatures increase. Peak summer surface temperatures are usually in the 70–80°F range (21–27°C), and in prolonged warm spells shallower bays can reach the low 80s°F (27–28°C). By autumn the lake cools back to about 55–65°F (13–18°C) before the late-season drop toward freezing.
Swimming at Knox Lake is generally possible in warmer months but depends on local rules and conditions. Where there are designated swimming areas and public access, people commonly swim when temperatures are comfortable (roughly above 70°F / 21°C) and health advisories are absent. Some parts of the lake may be posted against swimming for safety reasons such as steep drop-offs, boat traffic, lack of lifeguards, or occasional water-quality issues like algal blooms. Visitors should observe posted signs and any municipal or park guidance because allowances are based on safety and environmental health rather than a single statewide rule.