Peconic Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Peconic Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Peconic Lake today is 15.4°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 60°F (15°C) to 65°F (18°C). The water is comfortable for most people, making it an ideal range for water sports enthusiasts. The temperature does not cause significant discomfort, and swimming will be pleasant for the majority. However, it's important to remember that prolonged exposure to the water can still lead to cooling, so it's essential to monitor the time spent in the water, especially for children or elderly people. 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 |
|---|---|---|---|
| OCT 5 | 18.1°C | 16.5°C | |
| OCT 6 | 17.4°C | 16.5°C | |
| OCT 7 | 16.9°C | 16.5°C | |
| OCT 8 | 16.8°C | 16.5°C | |
| OCT 9 | 16.1°C | 16.5°C | |
| OCT 10 | 16.5°C | 16.5°C | |
| OCT 11 | 16.3°C | 16.5°C | |
| OCT 12 | 16.0°C | 16.5°C | |
| OCT 13 | 16.5°C | 15.5°C | |
| OCT 14 | 16.5°C | 15.5°C | |
| OCT 15 | 16.5°C | 15.6°C | |
| OCT 16 | 16.5°C | 15.6°C | |
| OCT 17 | 16.5°C | 15.7°C | |
| OCT 18 | 16.5°C | 15.7°C | |
| OCT 19 | 16.5°C | 15.8°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 | 0°C | 2°C | 4°C |
| February | 0°C | 2°C | 4°C |
| March | 0°C | 4°C | 8°C |
| April | 7°C | 12°C | 17°C |
| May | 11°C | 16°C | 21°C |
| June | 16°C | 20°C | 24°C |
| July | 22°C | 26°C | 29°C |
| August | 23°C | 26°C | 28°C |
| September | 20°C | 24°C | 27°C |
| October | 13°C | 17°C | 20°C |
| November | 6°C | 10°C | 13°C |
| December | 1°C | 6°C | 9°C |
Peconic Lake: Water Temperature by Location
Peconic Lake: Weather Forecast
October 13
October 14
October 15
October 16
October 17
October 18
Location & Local Information
Peconic-area lakes and bays on eastern Long Island typically follow seasonal patterns driven by coastal New York climate. In winter surface temperatures commonly fall into the mid‑30s to mid‑40s °F (about 2–7 °C). Spring sees a gradual rise, often ranging from the mid‑40s to the mid‑60s °F (roughly 7–18 °C) as air temperatures warm. Summer brings the warmest water, with surface readings commonly between the mid‑60s and upper‑70s °F (about 18–26 °C) and occasionally touching 80 °F (27 °C) in heat waves or shallow, sheltered spots. In autumn temperatures typically drop back through the 50s to low 70s °F (around 10–22 °C) before winter cooling sets in.
Swimming is generally allowed at public beaches and designated access points in the Peconic area when conditions are safe, mainly during the warmer months when water temperatures are comfortable for bathing. Local authorities or park services usually post advisories: closures or restrictions may occur because of high bacteria counts, harmful algal blooms (cyanobacteria), or hazardous weather and boating conditions. For safety and comfort, most recreational swimmers prefer water at or above about 70 °F (21 °C), and visitors should check current water‑quality reports and posted signage before entering.