Otisco Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Otisco Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Otisco Lake today is 18.9°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 | 19.0°C | 22.0°C | |
| SEP 15 | 19.5°C | 22.0°C | |
| SEP 16 | 19.6°C | 22.0°C | |
| SEP 17 | 18.4°C | 22.0°C | |
| SEP 18 | 19.0°C | 22.0°C | |
| SEP 19 | 19.0°C | 22.0°C | |
| SEP 20 | 18.9°C | 22.0°C | |
| SEP 21 | 18.9°C | 22.0°C | |
| SEP 22 | 22.0°C | 19.1°C | |
| SEP 23 | 22.0°C | 19.2°C | |
| SEP 24 | 22.0°C | 19.4°C | |
| SEP 25 | 22.0°C | 19.5°C | |
| SEP 26 | 22.0°C | 19.7°C | |
| SEP 27 | 22.0°C | 19.8°C | |
| SEP 28 | 22.0°C | 20.0°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 | 5°C |
| February | 0°C | 1°C | 4°C |
| March | 0°C | 1°C | 4°C |
| April | 2°C | 7°C | 12°C |
| May | 7°C | 13°C | 19°C |
| June | 15°C | 19°C | 23°C |
| July | 21°C | 26°C | 30°C |
| August | 21°C | 25°C | 29°C |
| September | 17°C | 22°C | 27°C |
| October | 13°C | 15°C | 17°C |
| November | 5°C | 10°C | 13°C |
| December | 0°C | 4°C | 6°C |
Otisco Lake: Water Temperature by Location
Otisco Lake: Weather Forecast
September 21
September 22
September 23
September 24
September 25
Location & Local Information
Otisco Lake’s surface temperatures vary widely through the year. In winter the lake often hovers near freezing, roughly 32–40°F (0–4°C), and may ice over at times. Spring sees a steady rise as meltwater and warming air push surface values into the 40–60°F range (4–15°C). By summer the shallow basin typically warms most days to comfortable swimming levels, commonly about 70–80°F (21–27°C) and occasionally reaching the mid-80s (around 29°C) during hot spells; however, deeper water remains noticeably cooler, sometimes 10–15°F (5–8°C) colder than the surface. In autumn surface temperatures drop back into the 50–65°F range (10–18°C) as cooling and turnover begin.
Swimming at Otisco Lake is possible and popular in warm months, but it is not universally unrestricted. Public access points and the county park provide places where swimming is allowed, yet most spots lack lifeguards so people swim at their own risk. Local authorities may issue advisories when water quality is poor; nutrient runoff can produce nuisance or harmful algal blooms in late summer, prompting temporary closures. Cold spring and fall waters also present cold-shock and hypothermia risks even when the air feels mild, so swimmers should heed posted signs, check current water-quality notices, and exercise caution.