Lake Wahapo – current water temperature and swimming conditions
This page provides information about the current water temperature at Lake Wahapo in West Coast 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 Wahapo today is 13°C.
Water Temperature in Lake Wahapo: 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 Wahapo 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 Wahapo will be 9.6°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 | 13.4°C | 9.1°C | |
| May 7 | 13.4°C | 9.1°C | |
| May 8 | 15.3°C | 9.1°C | |
| May 9 | 15.3°C | 9.1°C | |
| May 10 | 15.3°C | 9.1°C | |
| May 11 | 15.3°C | 9.1°C | |
| May 12 | 15.3°C | 9.1°C | |
| May 13 | 13.7°C | 9.1°C | |
| May 14 | 13.2°C | 9.1°C | 13.2°C |
| May 15 | 9.1°C | 12.7°C | |
| May 16 | 9.1°C | 12.2°C | |
| May 17 | 9.1°C | 11.7°C | |
| May 18 | 9.1°C | 11.2°C | |
| May 19 | 9.1°C | 10.6°C | |
| May 20 | 9.1°C | 10.1°C | |
| May 21 | 9.1°C | 9.6°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 | 7°C | 11°C | 15°C |
| February | 9°C | 14°C | 19°C |
| March | 6°C | 13°C | 19°C |
| April | 6°C | 9°C | 12°C |
| May | 3°C | 8°C | 12°C |
| June | 3°C | 7°C | 11°C |
| July | 2°C | 6°C | 9°C |
| August | 3°C | 6°C | 9°C |
| September | 3°C | 8°C | 12°C |
| October | 2°C | 8°C | 13°C |
| November | 4°C | 9°C | 13°C |
| December | 7°C | 11°C | 15°C |
Lake Wahapo: Weather Forecast
May 15
May 16
May 17
May 18
May 19
May 20
Location & Local Information
Lake Wahapo, in the West Coast Region near Franz Josef, is a shallow lake set within a broad glacial valley and surrounded by forest and wetlands. Because it is relatively shallow, its water temperature responds more quickly to seasonal air conditions than deeper alpine lakes nearby. In winter, surface temperatures are generally around 7–11°C. During spring, the lake gradually warms to approximately 11–15°C, although frequent rainfall can influence both temperature and clarity. In summer, particularly in January and February, near-shore areas may reach about 15–20°C on calm, settled days. By autumn, temperatures usually ease back to between 10 and 15°C. Strong winds and heavy rain can cause short-term fluctuations.
Swimming Conditions
Swimming is allowed at Lake Wahapo, but it is not as commonly used for recreation as some other lakes. The most comfortable time for a swim is during mid to late summer when temperatures approach the high teens and winds are light. However, water clarity can vary due to sediment and tannins from surrounding wetlands. Swimmers should choose accessible shoreline spots and avoid entering the lake after heavy rainfall, when runoff may affect conditions. Checking weather and local information beforehand helps ensure a safer and more enjoyable experience in this scenic West Coast setting.