Lake Rotorua – current water temperature and swimming conditions
This page provides information about the current water temperature at Lake Rotorua 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 Rotorua today is 14°C.
Water Temperature in Lake Rotorua: 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 Rotorua 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 Rotorua will be 15.3°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 | 13.7°C | 15.5°C | |
| May 7 | 13.7°C | 15.5°C | |
| May 8 | 16.2°C | 15.5°C | |
| May 9 | 16.2°C | 15.5°C | |
| May 10 | 14.8°C | 15.5°C | |
| May 11 | 14.8°C | 15.5°C | |
| May 12 | 14.6°C | 15.5°C | |
| May 13 | 14.2°C | 15.5°C | |
| May 14 | 13.9°C | 15.5°C | 13.9°C |
| May 15 | 15.5°C | 14.1°C | |
| May 16 | 15.5°C | 14.3°C | |
| May 17 | 15.5°C | 14.5°C | |
| May 18 | 15.5°C | 14.7°C | |
| May 19 | 15.5°C | 14.9°C | |
| May 20 | 15.5°C | 15.1°C | |
| May 21 | 15.5°C | 15.3°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 | 16°C | 20°C | 24°C |
| February | 17°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 Rotorua: Water Temperature by Location
🔗 Rotorua
Lake Rotorua: Weather Forecast
May 15
May 16
May 17
May 18
May 19
May 20
Location & Local Information
Lake Rotorua, in the Bay of Plenty Region, is one of the North Island’s largest lakes and sits within a geothermally active landscape. Water temperatures vary through the year, influenced by climate, shallow depth and local geothermal inflows. In winter, surface temperatures are generally around 10–14°C. During spring, the lake gradually warms to approximately 14–18°C. In summer, especially in January and February, water temperatures commonly reach about 20–24°C, with sheltered bays sometimes feeling slightly warmer on calm, sunny days. In autumn, temperatures typically ease back to between 15 and 19°C. Short-term changes can occur due to wind mixing or heavy rainfall.
Swimming Conditions
Swimming is allowed in designated areas of Lake Rotorua, and it is a popular activity during the warmer months. The most comfortable conditions are usually in mid to late summer when temperatures exceed 20°C. However, swimmers should be aware that water quality can vary at times due to algal blooms, particularly during prolonged warm and calm periods. It is advisable to swim at recognised sites and check current water quality updates before entering the lake. With suitable conditions and stable weather, Lake Rotorua can offer pleasant freshwater swimming in a uniquely geothermal setting.