Lake Rotoiti – current water temperature and swimming conditions

This page provides information about the current water temperature at Lake Rotoiti 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

14.2°C

Today

14.5°C

Yesterday

16.5°C

A Week Ago

The water temperature in Lake Rotoiti today is 14°C.

Water Temperature in Lake Rotoiti: 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 Rotoiti 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 Rotoiti 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	14.0°C	15.5°C
May 7	14.0°C	15.5°C
May 8	16.5°C	15.5°C
May 9	16.5°C	15.5°C
May 10	15.1°C	15.5°C
May 11	15.1°C	15.5°C
May 12	14.9°C	15.5°C
May 13	14.5°C	15.5°C
May 14	14.2°C	15.5°C	14.2°C
May 15		15.5°C	14.4°C
May 16		15.5°C	14.5°C
May 17		15.5°C	14.7°C
May 18		15.5°C	14.9°C
May 19		15.5°C	15.0°C
May 20		15.5°C	15.2°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 Rotoiti: Weather Forecast

May 15

6°C / 14°C

overcast

rain: 0% | wind: 12 km/h

May 16

6°C / 14°C

partly cloudy

rain: 0% | wind: 14 km/h

May 17

7°C / 14°C

overcast

rain: 2% | wind: 14 km/h

May 18

6°C / 15°C

overcast

rain: 2% | wind: 13 km/h

May 19

3°C / 14°C

overcast

rain: 2% | wind: 9 km/h

May 20

4°C / 12°C

overcast

rain: 11% | wind: 6 km/h

Location & Local Information

Lake Rotoiti, in the Bay of Plenty Region, lies east of Rotorua and is known for its sheltered bays and warm northern climate. As a relatively shallow lake compared with some alpine lakes further south, its water temperature responds readily to seasonal changes. In winter, surface temperatures are generally around 11–15°C. During spring, the lake gradually warms to approximately 15–19°C. In summer, particularly in January and February, near-shore areas and sheltered coves can reach about 20–24°C on warm, calm days, sometimes feeling even warmer in enclosed bays. By autumn, temperatures usually ease back to between 15 and 19°C. Wind and rainfall can cause short-term fluctuations, especially in more exposed sections.

Swimming Conditions

Swimming is allowed at many accessible points around Lake Rotoiti, including public reserves and small beaches, and it is a popular summer activity. The most comfortable conditions are typically in mid to late summer when water temperatures exceed 20°C and winds are light. However, swimmers should be mindful of boat traffic in busy areas and occasional changes in water quality during extended warm periods. Choosing recognised swimming spots and checking current water quality updates before entering the lake helps ensure safe and enjoyable freshwater swimming.

Nearby Lakes

Frequently Asked Questions

What is the current water temperature in Lake Rotoiti?

The water temperature in Lake Rotoiti today is 14°C.

What is the water temperature in Lake Rotoiti during the summer months?

In summer, water temperatures in Lake Rotoiti at Wangi Wangi typically range from 15°C to 25°C.

Is it possible to swim in Lake Rotoiti (Bay of Plenty Region)?

Yes — people commonly swim in Lake Rotoiti in summer, with surface temperatures often reaching the high teens to low twenties °C (typically warmest in Dec–Feb), though the water can feel chilly outside those months and down in deeper areas. Always check current water quality and weather advisories before entering, be mindful of submerged hazards and cold‑water shock, and consider a wetsuit or sticking to supervised spots for longer swims.