Lake Keretā – current water temperature and swimming conditions

This page provides information about the current water temperature at Lake Keretā in Auckland 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

16.2°C

Today

18.9°C

Yesterday

19.1°C

A Week Ago

The water temperature in Lake Keretā today is 16°C.

Water Temperature in Lake Keretā: 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

Water temperatures in Lake Keretā 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 Keretā will be 14.4°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 7	16.6°C	14.1°C
May 8	18.4°C	14.1°C
May 9	19.1°C	14.1°C
May 10	19.1°C	14.1°C
May 11	19.2°C	14.1°C
May 12	19.2°C	14.1°C
May 13	18.9°C	14.1°C
May 14	18.9°C	14.1°C
May 15	16.2°C	14.1°C	16.2°C
May 16		14.1°C	15.9°C
May 17		14.1°C	15.7°C
May 18		14.1°C	15.4°C
May 19		14.1°C	15.2°C
May 20		14.1°C	14.9°C
May 21		14.1°C	14.6°C
May 22		14.1°C	14.4°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	17°C	21°C	25°C
February	17°C	22°C	26°C
March	15°C	19°C	23°C
April	12°C	16°C	20°C
May	9°C	13°C	17°C
June	6°C	11°C	16°C
July	5°C	10°C	14°C
August	8°C	12°C	16°C
September	8°C	13°C	17°C
October	11°C	15°C	19°C
November	13°C	17°C	21°C
December	16°C	20°C	24°C

Lake Keretā: Weather Forecast

May 15

9°C / 16°C

mainly clear

rain: 0% | wind: 14 km/h

May 16

8°C / 17°C

clear sky

rain: 0% | wind: 15 km/h

May 17

9°C / 16°C

mainly clear

rain: 0% | wind: 15 km/h

May 18

10°C / 16°C

mainly clear

rain: 6% | wind: 19 km/h

May 19

11°C / 17°C

mainly clear

rain: 6% | wind: 20 km/h

Location & Local Information

Lake Keretā, in the Auckland Region west of Waiuku, is a small, shallow coastal dune lake surrounded by farmland and native vegetation. Its water temperature reflects the mild upper North Island climate and its limited 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 increase. In summer, particularly in January and February, shallow areas can reach about 20–25°C on hot, settled days. By autumn, temperatures usually ease back to between 15 and 20°C. Because the lake is shallow, wind and rainfall can quickly influence surface temperature and clarity.

Swimming Conditions

Swimming is allowed at Lake Keretā, and it can be pleasant during the warmer months when water temperatures exceed 20°C. The most comfortable conditions are typically in mid to late summer on calm days with light winds. However, water quality can vary at times due to nutrient levels and occasional algal blooms during prolonged warm periods. Swimmers should use established access points and check current water quality information before entering the lake. Choosing settled weather conditions helps ensure a safer and more enjoyable freshwater swimming experience.

Nearby Lakes

Frequently Asked Questions

What is the current water temperature in Lake Keretā?

The water temperature in Lake Keretā today is 16°C.

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

In summer, water temperatures in Lake Keretā at Wangi Wangi typically range from 16°C to 26°C.

Is it possible to swim in Lake Keretā (Auckland Region)?

Yes — you can swim in Lake Keretā in fine weather, with sheltered areas that are calm in summer, though the water is often cool outside the warmest months. Always check Auckland Council or local signage for water‑quality notices, be mindful of submerged hazards and changeable weather, supervise weaker swimmers or children, and prefer lifeguarded spots or a personal flotation device if you’re unsure.