Lake Rotomahana – current water temperature and swimming conditions
This page provides information about the current water temperature at Lake Rotomahana in Bay of Plenty 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 Rotomahana today is 18°C.
Water Temperature in Lake Rotomahana: 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
While water temperatures in Lake Rotomahana declined overall during the past month, they have shown a noticeable rebound over the last week.
According to our forecast, the water temperature in Lake Rotomahana will be 21.1°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 | 18.1°C | 19.7°C | |
| Mar 23 | 17.9°C | 19.7°C | |
| Mar 24 | 17.9°C | 19.7°C | |
| Mar 25 | 17.9°C | 19.7°C | |
| Mar 26 | 17.8°C | 19.7°C | |
| Mar 27 | 17.8°C | 19.7°C | |
| Mar 28 | 16.3°C | 19.7°C | |
| Mar 29 | 16.3°C | 19.7°C | |
| Mar 30 | 18.0°C | 19.7°C | 18.0°C |
| Mar 31 | 19.7°C | 18.4°C | |
| Apr 1 | 19.7°C | 18.9°C | |
| Apr 2 | 19.7°C | 19.3°C | |
| Apr 3 | 19.7°C | 19.8°C | |
| Apr 4 | 19.7°C | 20.2°C | |
| Apr 5 | 19.7°C | 20.6°C | |
| Apr 6 | 19.7°C | 21.1°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 | 16°C | 20°C | 24°C |
| February | 16°C | 21°C | 25°C |
| March | 17°C | 21°C | 24°C |
| April | 15°C | 18°C | 21°C |
| May | 13°C | 16°C | 18°C |
| June | 10°C | 13°C | 16°C |
| July | 9°C | 12°C | 14°C |
| August | 9°C | 12°C | 14°C |
| September | 9°C | 13°C | 16°C |
| October | 10°C | 14°C | 17°C |
| November | 12°C | 16°C | 19°C |
| December | 15°C | 19°C | 23°C |
Lake Rotomahana: Weather Forecast
March 30
March 31
April 1
April 2
April 3
April 4
Location & Local Information
Lake Rotomahana, in the Bay of Plenty Region south of Rotorua, is a geothermal lake formed and reshaped by the 1886 eruption of Mount Tarawera. Surrounded by native bush and thermal features, its water temperature is influenced by both climate and geothermal activity. In winter, surface temperatures are generally around 12–16°C, slightly warmer than some nearby lakes due to thermal inflows. During spring, the lake gradually warms to approximately 16–20°C. In summer, particularly in January and February, near-surface temperatures can reach about 20–25°C in some areas, although sections affected by geothermal vents may vary significantly. By autumn, temperatures usually ease back to between 16 and 20°C. Wind and thermal activity can create localised differences.
Swimming Conditions
Swimming is not generally recommended at Lake Rotomahana. While parts of the lake may reach comfortable temperatures in summer, geothermal vents, variable lakebed conditions and limited public shoreline access mean it is not a designated swimming destination. Boat tours operate on the lake, but recreational swimming is uncommon. Visitors seeking a water-based experience in the area are more likely to explore guided tours or nearby designated swimming lakes. Checking local guidance before entering the water is essential due to the geothermal environment.