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 7°C.
Water Temperature in Lake Dunstan: Daily Trends, Historical Records, and Forecast
❌ Lake water below 10°C is extremely cold and generally unsuitable for swimming for most people. Even during warm weather, deep lakes retain cold water, making entry uncomfortable and limiting time in the water. Swimming at this temperature is usually limited to quick dips or cold-water enthusiasts. Cool air temperatures or cloudy conditions can make lake swimming particularly harsh.
Water Temperature Over the Last 30 Days
Water temperatures in Lake Dunstan have been gradually cooling over the past month, with a further drop recorded during the last week.
According to our forecast, the water temperature in Lake Dunstan will be 10.3°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 |
|---|---|---|---|
| Aug 19 | 14.1°C | 10.8°C | |
| Aug 20 | 14.1°C | 10.8°C | |
| Aug 21 | 14.1°C | 10.8°C | |
| Aug 22 | 13.5°C | 10.8°C | |
| Aug 23 | 13.5°C | 10.8°C | |
| Aug 24 | 13.5°C | 10.8°C | |
| Aug 25 | 6.6°C | 10.8°C | |
| Aug 26 | 6.6°C | 10.8°C | |
| Aug 27 | 6.6°C | 10.8°C | 6.6°C |
| Aug 28 | 10.8°C | 7.1°C | |
| Aug 29 | 10.8°C | 7.7°C | |
| Aug 30 | 10.8°C | 8.2°C | |
| Aug 31 | 10.8°C | 8.7°C | |
| Sep 1 | 10.8°C | 9.2°C | |
| Sep 2 | 10.8°C | 9.8°C | |
| Sep 3 | 10.8°C | 10.3°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 New Zealand.
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
August 28
August 29
August 30
August 31
September 1
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.