Henderson Harbor Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Henderson Harbor Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Henderson Harbor Lake today is 19.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. 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 | 19.3°C | 19.7°C | |
| SEP 15 | 19.7°C | 19.7°C | |
| SEP 16 | 19.7°C | 19.7°C | |
| SEP 17 | 18.9°C | 19.7°C | |
| SEP 18 | 19.5°C | 19.7°C | |
| SEP 19 | 19.8°C | 19.7°C | |
| SEP 20 | 19.7°C | 19.7°C | |
| SEP 21 | 19.5°C | 19.7°C | |
| SEP 22 | 19.7°C | 19.5°C | |
| SEP 23 | 19.7°C | 19.5°C | |
| SEP 24 | 19.7°C | 19.5°C | |
| SEP 25 | 19.7°C | 19.5°C | |
| SEP 26 | 19.7°C | 19.6°C | |
| SEP 27 | 19.7°C | 19.6°C | |
| SEP 28 | 19.7°C | 19.6°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 | 2°C | 4°C |
| February | 0°C | 2°C | 5°C |
| March | 1°C | 3°C | 6°C |
| April | 2°C | 7°C | 12°C |
| May | 5°C | 11°C | 16°C |
| June | 13°C | 17°C | 22°C |
| July | 20°C | 25°C | 29°C |
| August | 20°C | 23°C | 26°C |
| September | 17°C | 20°C | 23°C |
| October | 13°C | 16°C | 18°C |
| November | 5°C | 10°C | 15°C |
| December | 2°C | 5°C | 7°C |
Henderson Harbor Lake: Water Temperature by Location
Henderson Harbor Lake: Weather Forecast
September 21
September 22
September 23
September 24
September 25
September 26
Location & Local Information
Henderson Harbor, on the eastern shore of Lake Ontario in upstate New York, experiences water temperatures that vary widely through the year. In spring the nearshore surface waters typically run from about 40–60°F (4–16°C) as the lake sheds winter cold; by summer (June–August) sheltered harbor areas and shallow bays commonly warm to roughly 65–75°F (18–24°C), and on warm spells can reach 75–78°F (24–26°C). Early autumn sees temperatures dropping into the 50–68°F (10–20°C) range, while winter months often bring surface values near freezing, about 32–39°F (0–4°C), with ice and very cold conditions possible in severe winters. Open-water spots connected to Lake Ontario remain cooler than protected coves because of depth and mixing.
Swimming in Henderson Harbor is generally permitted in suitable places, particularly at designated shorelines and private docks, but it is condition-dependent. Local authorities or property owners may manage specific access, and safety factors such as sudden temperature changes (cold shock), boat traffic, underwater hazards, and occasional water-quality advisories determine when it is sensible to enter the water. Sheltered shallows warm faster and are more comfortable for casual swimming in summer, whereas spring and fall conditions can be brisk and winter swimming is hazardous without special precautions.