Lake Windermere – current water temperature and swimming conditions
This page provides information about the current water temperature at Lake Windermere in Jervis Bay Territory. Here you can view recent temperature trends on a 30-day chart, check typical monthly water temperature ranges, and compare today’s reading with historical averages for this date. A 7-day water temperature forecast, local weather conditions, and an overview of swimming suitability are also included.
Current Water Temperature
The water temperature in Lake Windermere today is 18°C.
Water Temperature in Lake Windermere: Daily Trends, Historical Records, and Forecast
⚠️ A lake temperature of 15 to 20°C is considered cool to comfortable for swimming in Australia. On warm days with light winds, this range allows for relaxed swimming, especially in shallow or sheltered areas. Comfort depends strongly on air temperature and sunshine, as cooler or overcast weather can still make the water feel chilly. This range is common during spring and early summer.
Water Temperature Over the Last 30 Days
While water temperatures in Lake Windermere declined overall during the past month, they have shown a noticeable rebound over the last week.
According to our forecast, the water temperature in Lake Windermere will be 15.5°C in the next 7 days. See the table below for daily data for the upcoming week.
Table of Daily Water Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| Apr 28 | 17.6°C | 15.3°C | |
| Apr 29 | 17.6°C | 15.3°C | |
| Apr 30 | 17.7°C | 15.3°C | |
| May 1 | 18.0°C | 15.3°C | |
| May 2 | 18.1°C | 15.3°C | |
| May 3 | 17.9°C | 15.3°C | |
| May 4 | 17.9°C | 15.3°C | |
| May 5 | 17.8°C | 15.3°C | |
| May 6 | 17.8°C | 15.3°C | 17.8°C |
| May 7 | 15.3°C | 17.5°C | |
| May 8 | 15.3°C | 17.2°C | |
| May 9 | 15.3°C | 16.8°C | |
| May 10 | 15.3°C | 16.5°C | |
| May 11 | 15.3°C | 16.2°C | |
| May 12 | 15.3°C | 15.9°C | |
| May 13 | 15.3°C | 15.5°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual lake water temperatures may differ from the reported values by several degrees, particularly during periods of strong winds or rapid weather changes. Wind can mix surface and deeper layers in a lake, bringing cooler water to the surface, while shallow areas may warm more quickly under direct sunlight. Air temperature, sunshine, and cloud cover strongly influence how quickly a lake heats up or cools down. These factors can lead to noticeable temperature variations across different parts of the lake.
Our forecast is based on a proprietary mathematical model that considers real-time lake temperature observations, historical trends, seasonal cycles, wind strength and direction, and region-specific air temperature. To enhance accuracy, we also incorporate data from nearby monitored locations and comparable lakes within Australia.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Today | Yesterday | A Week Ago |
|---|---|---|---|
| January | 20°C | 24°C | 27°C |
| February | 19°C | 23°C | 28°C |
| March | 17°C | 21°C | 25°C |
| April | 14°C | 19°C | 22°C |
| May | 11°C | 15°C | 20°C |
| June | 9°C | 13°C | 16°C |
| July | 8°C | 11°C | 13°C |
| August | 10°C | 12°C | 14°C |
| September | 12°C | 15°C | 18°C |
| October | 15°C | 18°C | 22°C |
| November | 18°C | 20°C | 24°C |
| December | 20°C | 23°C | 26°C |
Location & Local Information
Lake Windermere is a small inland lake within the Jervis Bay Territory, set back from the coast and surrounded by bushland. Its water temperature is shaped by the mild coastal climate but without the direct warming influence of the ocean. In summer, the lake typically reaches around 20–24°C, which feels comfortably mild and suitable for cooling off on warm days. Spring and autumn are a little cooler, generally sitting between 17–21°C. During winter, water temperatures often drop to about 14–17°C, giving the lake a cool but not harsh feel compared with many inland lakes further south.
Swimming Conditions
Swimming in Lake Windermere is generally allowed, but it is low-key and dependent on conditions. The lake is calm and sheltered, with no waves or strong currents, which makes it suitable for relaxed swimming when the water is clear. Water quality is usually good in dry periods, but after heavy rain runoff can reduce clarity and slightly lower temperatures, and locals tend to avoid swimming until things settle. There are no formal swimming facilities, so most people enter the water carefully from natural edges. Overall, Lake Windermere offers quiet, seasonal swimming opportunities, best enjoyed in summer and early autumn, providing a peaceful freshwater alternative to the nearby beaches of Jervis Bay when you’re after calmer conditions.