Lake Dunstan – current water temperature and swimming conditions
This page provides information about the current water temperature at Lake Dunstan in Otago Region. 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 Dunstan today is 17°C.
Water Temperature in Lake Dunstan: 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
Water temperatures in Lake Dunstan have been on a steady rise over the past month and have continued to climb over the last week.
According to our forecast, the water temperature in Lake Dunstan will be 16.7°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 |
|---|---|---|---|
| Mar 22 | 16.4°C | 15.0°C | |
| Mar 23 | 16.5°C | 15.0°C | |
| Mar 24 | 16.4°C | 15.0°C | |
| Mar 25 | 16.4°C | 15.0°C | |
| Mar 26 | 16.6°C | 15.0°C | |
| Mar 27 | 16.6°C | 15.0°C | |
| Mar 28 | 15.1°C | 15.0°C | |
| Mar 29 | 15.1°C | 15.0°C | |
| Mar 30 | 16.8°C | 15.0°C | 16.8°C |
| Mar 31 | 15.0°C | 16.8°C | |
| Apr 1 | 15.0°C | 16.8°C | |
| Apr 2 | 15.0°C | 16.8°C | |
| Apr 3 | 15.0°C | 16.8°C | |
| Apr 4 | 15.0°C | 16.7°C | |
| Apr 5 | 15.0°C | 16.7°C | |
| Apr 6 | 15.0°C | 16.7°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 | 12°C | 17°C | 21°C |
| February | 12°C | 16°C | 20°C |
| March | 11°C | 15°C | 19°C |
| April | 10°C | 13°C | 16°C |
| May | 8°C | 11°C | 14°C |
| June | 6°C | 9°C | 12°C |
| July | 4°C | 7°C | 10°C |
| August | 5°C | 8°C | 10°C |
| September | 6°C | 9°C | 12°C |
| October | 7°C | 11°C | 14°C |
| November | 8°C | 12°C | 16°C |
| December | 10°C | 15°C | 19°C |
Lake Dunstan: Weather Forecast
March 30
March 31
April 1
April 2
April 3
Location & Local Information
Lake Dunstan, in the Otago Region between Cromwell and Clyde, is a long hydro lake formed on the Clutha River. Set within a dry inland climate, its water temperature reflects both alpine inflows from upstream and hot Central Otago summers. In winter, surface temperatures are generally around 6–9°C. During spring, snowmelt from the Southern Alps keeps the lake cool, typically between 9 and 14°C. In summer, particularly in January and February, sheltered bays and near-shore areas can warm to approximately 17–23°C on hot, settled days, while deeper water remains cooler. By autumn, temperatures usually ease back to between 11 and 17°C. Wind can influence surface mixing, especially in narrower sections.
Swimming Conditions
Swimming is allowed at many accessible shoreline spots, including beaches and reserve areas near Cromwell and Clyde. The most comfortable conditions are usually in mid to late summer when water temperatures exceed 18°C and winds are light. However, the lake can become choppy during strong afternoon winds, which are common in this valley. Swimmers should choose sheltered areas and calm weather, and remain aware of boat traffic in popular sections. Checking local conditions beforehand helps ensure a safe and enjoyable freshwater swimming experience.