Tionesta Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Tionesta Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Tionesta Lake today is 20.4°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 | 17.6°C | 19.5°C | |
| JUN 4 | 17.8°C | 19.5°C | |
| JUN 5 | 18.9°C | 19.5°C | |
| JUN 6 | 19.2°C | 19.5°C | |
| JUN 7 | 19.7°C | 19.5°C | |
| JUN 8 | 19.7°C | 19.5°C | |
| JUN 10 | 20.4°C | 19.5°C | |
| JUN 11 | 19.5°C | 20.4°C | |
| JUN 12 | 19.5°C | 20.3°C | |
| JUN 13 | 19.5°C | 20.3°C | |
| JUN 14 | 19.5°C | 20.2°C | |
| JUN 15 | 19.5°C | 20.2°C | |
| JUN 16 | 19.5°C | 20.1°C | |
| JUN 17 | 19.5°C | 20.1°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 | 4°C | 6°C |
| February | 0°C | 4°C | 7°C |
| March | 0°C | 4°C | 7°C |
| April | 6°C | 10°C | 15°C |
| May | 11°C | 17°C | 22°C |
| June | 15°C | 20°C | 24°C |
| July | 23°C | 25°C | 27°C |
| August | 21°C | 25°C | 29°C |
| September | 19°C | 22°C | 25°C |
| October | 13°C | 16°C | 19°C |
| November | 5°C | 9°C | 13°C |
| December | 2°C | 5°C | 8°C |
Tionesta Lake: Water Temperature by Location
Tionesta Lake: Weather Forecast
June 9
June 10
June 11
June 12
June 13
Location & Local Information
Tionesta Lake, in northwestern Pennsylvania, experiences a wide annual range of surface water temperatures driven by seasonal air temperatures and inflows. In winter the lake commonly approaches freezing, around 32°F (0°C), and may develop ice cover in sustained cold periods. Spring sees a gradual thaw with surface temperatures typically rising into the 40–55°F range (4–13°C). By midsummer surface readings usually reach their peak, often between about 68–78°F (20–26°C) on warm days, and occasionally a bit higher during heat waves. In autumn the water cools again, commonly falling into the 50–65°F band (10–18°C) as air temperatures drop and stratification breaks down.
Swimming at Tionesta Lake is possible but should be approached with caution and in accordance with posted regulations. Many recreational areas permit swimming, yet beaches are generally unsupervised and conditions vary, so swimmers are expected to assume personal responsibility. Authorities may restrict access at times to protect public safety and water quality, and cold or rapidly changing temperatures, submerged hazards, and boat traffic are key reasons for caution. Because water below about 70°F (21°C) can feel uncomfortably cold and increase risk of cold-water shock or hypothermia, the safest swimming months tend to be the warmest part of summer when surface temperatures are highest.