Lake Sylvan – current water temperature and swimming conditions
This page provides information about the current water temperature at Lake Sylvan 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 Sylvan today is 13°C.
Water Temperature in Lake Sylvan: 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 Sylvan 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 Sylvan will be 8.3°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 |
|---|---|---|---|
| May 6 | 11.9°C | 7.7°C | |
| May 7 | 11.9°C | 7.7°C | |
| May 8 | 13.3°C | 7.7°C | |
| May 9 | 13.3°C | 7.7°C | |
| May 10 | 13.3°C | 7.7°C | |
| May 11 | 13.3°C | 7.7°C | |
| May 12 | 13.1°C | 7.7°C | |
| May 13 | 11.8°C | 7.7°C | |
| May 14 | 12.6°C | 7.7°C | 12.6°C |
| May 15 | 7.7°C | 12.0°C | |
| May 16 | 7.7°C | 11.4°C | |
| May 17 | 7.7°C | 10.8°C | |
| May 18 | 7.7°C | 10.2°C | |
| May 19 | 7.7°C | 9.5°C | |
| May 20 | 7.7°C | 8.9°C | |
| May 21 | 7.7°C | 8.3°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 | 9°C | 16°C | 22°C |
| February | 10°C | 15°C | 20°C |
| March | 6°C | 12°C | 18°C |
| April | 5°C | 9°C | 13°C |
| May | 2°C | 6°C | 10°C |
| June | 0°C | 4°C | 8°C |
| July | 0°C | 4°C | 7°C |
| August | 0°C | 4°C | 7°C |
| September | 2°C | 7°C | 12°C |
| October | 4°C | 9°C | 13°C |
| November | 6°C | 12°C | 17°C |
| December | 8°C | 13°C | 18°C |
Lake Sylvan: Weather Forecast
May 15
May 16
May 17
May 18
May 19
May 20
Location & Local Information
Lake Sylvan is a small alpine lake near Glenorchy in the Otago Region, set within native beech forest at the edge of Mount Aspiring National Park. Because of its elevation and proximity to the Southern Alps, the lake remains cool for much of the year. In summer, from December to February, surface water temperatures typically range between 12°C and 16°C, occasionally reaching the high teens during prolonged warm spells. In spring and autumn, temperatures are generally between 8°C and 13°C, while in winter they often fall to around 4°C to 7°C, reflecting cold overnight air temperatures and limited solar heating.
Swimming Conditions
Swimming is not prohibited, but it is not a common activity here. Lake Sylvan is better known for its walking track and tranquil forest setting than for water recreation. Even in mid-summer, the water feels distinctly cold, and most people who enter do so for a brief dip rather than extended swimming. The lakebed and shoreline are natural and undeveloped, and there are no dedicated swimming facilities. As a result, while confident swimmers may enjoy a refreshing plunge on a warm day, conditions are generally best suited to short immersion rather than long periods in the water.