Lake Rotomā – current water temperature and swimming conditions
This page provides information about the current water temperature at Lake Rotomā 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 Rotomā today is 15°C.
Water Temperature in Lake Rotomā: 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 Rotomā 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 Rotomā will be 15.4°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 | 14.4°C | 15.5°C | |
| May 7 | 14.4°C | 15.5°C | |
| May 8 | 16.8°C | 15.5°C | |
| May 9 | 16.8°C | 15.5°C | |
| May 10 | 15.3°C | 15.5°C | |
| May 11 | 15.3°C | 15.5°C | |
| May 12 | 15.1°C | 15.5°C | |
| May 13 | 14.8°C | 15.5°C | |
| May 14 | 14.6°C | 15.5°C | 14.6°C |
| May 15 | 15.5°C | 14.7°C | |
| May 16 | 15.5°C | 14.8°C | |
| May 17 | 15.5°C | 14.9°C | |
| May 18 | 15.5°C | 15.1°C | |
| May 19 | 15.5°C | 15.2°C | |
| May 20 | 15.5°C | 15.3°C | |
| May 21 | 15.5°C | 15.4°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 Rotomā: Weather Forecast
May 15
May 16
May 17
May 18
May 19
May 20
Location & Local Information
Lake Rotomā, in the Bay of Plenty Region between Rotorua and Whakatāne, is a clear volcanic lake known for its relatively good water quality and sheltered bays. Its water temperature reflects the warm eastern North Island climate and moderate depth. In winter, surface temperatures are generally around 11–15°C. During spring, the lake gradually warms to approximately 15–19°C as air temperatures rise. In summer, particularly in January and February, near-shore areas can reach about 20–24°C on calm, sunny days, while deeper water remains slightly cooler. By autumn, temperatures usually ease back to between 15 and 19°C. Wind and rainfall can cause short-term variations.
Swimming Conditions
Swimming is allowed at several accessible points around Lake Rotomā, including small beaches and reserve areas. It is a popular summer activity, especially when water temperatures exceed 20°C and winds are light. The gently sloping shorelines in some bays make entry straightforward. However, swimmers should be mindful of boat traffic and occasional weed growth in shallow sections. Checking local water quality updates before entering the lake is advisable, particularly after heavy rain. In settled summer conditions, Lake Rotomā offers comfortable freshwater swimming in a scenic setting.