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 13°C.
Water Temperature in Lake Dunstan: Daily Trends, Historical Records, and Forecast
⚠️ Lake temperatures between 10 and 15°C are cold but can be manageable for short swims on sunny, warm days. Shallow areas may feel slightly warmer, while deeper sections remain cold and slow to warm up. Most swimmers keep sessions brief, and wetsuits are often used for comfort. Wind and cooler air temperatures can quickly reduce how pleasant the swim feels.
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 11.5°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 |
|---|---|---|---|
| May 6 | 13.0°C | 11.3°C | |
| May 7 | 13.0°C | 11.3°C | |
| May 8 | 14.6°C | 11.3°C | |
| May 9 | 14.6°C | 11.3°C | |
| May 10 | 14.6°C | 11.3°C | |
| May 11 | 14.6°C | 11.3°C | |
| May 12 | 14.5°C | 11.3°C | |
| May 13 | 13.0°C | 11.3°C | |
| May 14 | 12.6°C | 11.3°C | 12.6°C |
| May 15 | 11.3°C | 12.4°C | |
| May 16 | 11.3°C | 12.3°C | |
| May 17 | 11.3°C | 12.1°C | |
| May 18 | 11.3°C | 12.0°C | |
| May 19 | 11.3°C | 11.8°C | |
| May 20 | 11.3°C | 11.6°C | |
| May 21 | 11.3°C | 11.5°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 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
May 15
May 16
May 17
May 18
May 19
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.