Lake Atiamuri – current water temperature and swimming conditions

This page provides information about the current water temperature at Lake Atiamuri in Waikato 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

12.3°C

Today

14.0°C

Yesterday

14.3°C

A Week Ago

The water temperature in Waikato River at Lake Atiamuri today is 12°C.

Water Temperature in Waikato River at Lake Atiamuri: Daily Trends, Historical Records, and Forecast

⚠️ River water between 10 and 15°C is cold but manageable for short swims, especially on sunny days with warm air temperatures. The moving nature of a river can make the water feel colder than the actual reading, particularly in shaded or deeper sections. Casual swimming is usually brief, with wetsuits often preferred. Windy or cool weather can significantly reduce comfort, even when the air temperature is mild.

Water Temperature Over the Last 30 Days

Water temperatures in Lake Atiamuri 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 Atiamuri will be 13.4°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	12.2°C	15.0°C
May 8	12.2°C	15.0°C
May 9	14.3°C	15.0°C
May 10	14.3°C	15.0°C
May 11	14.6°C	15.0°C
May 12	14.6°C	15.0°C
May 13	14.3°C	15.0°C
May 14	14.0°C	15.0°C
May 15	12.3°C	15.0°C	12.3°C
May 16		15.0°C	12.5°C
May 17		15.0°C	12.6°C
May 18		15.0°C	12.8°C
May 19		15.0°C	13.0°C
May 20		15.0°C	13.1°C
May 21		15.0°C	13.3°C
May 22		15.0°C	13.4°C

* Current - Actual water temperature value

** Average - Average water temperature on this day in recent years

*** Forecast - Our water temperature forecast

Actual river water temperatures may vary by several degrees from the reported values, particularly after heavy rainfall or periods of changing weather. Rainfall, river flow rates, and runoff from cooler upstream areas can significantly affect water temperature, especially in flowing sections and shaded stretches. Air temperature and cloud cover also play an important role, with warm, sunny conditions helping rivers warm up more quickly. As a result, noticeable temperature differences can occur along the same river.

Our forecast is based on a proprietary mathematical model that takes into account real-time river temperature changes, historical data, seasonal patterns, river flow conditions, recent rainfall, and local air temperature. We also factor in broader weather conditions specific to each region of New Zealand to improve accuracy.

Monthly Water Temperature Range (Min, Max & Average)

Month	Today	Yesterday	A Week Ago
January	15°C	20°C	24°C
February	15°C	20°C	24°C
March	16°C	20°C	23°C
April	14°C	18°C	21°C
May	12°C	15°C	18°C
June	10°C	13°C	15°C
July	9°C	12°C	14°C
August	9°C	11°C	13°C
September	9°C	12°C	14°C
October	9°C	12°C	15°C
November	12°C	15°C	18°C
December	13°C	18°C	22°C

Lake Atiamuri: Weather Forecast

May 15

4°C / 15°C

clear sky

rain: 0% | wind: 10 km/h

May 16

4°C / 15°C

mainly clear

rain: 0% | wind: 10 km/h

May 17

5°C / 14°C

overcast

rain: 0% | wind: 15 km/h

May 18

6°C / 15°C

mainly clear

rain: 0% | wind: 10 km/h

May 19

2°C / 15°C

clear sky

rain: 0% | wind: 8 km/h

Location & Local Information

Lake Atiamuri is a narrow hydro lake formed on the Waikato River, located between Lake Whakamaru and Lake Arapuni in the Waikato Region. The lake’s water temperature reflects both seasonal weather patterns and the controlled flow of the river system. In summer, surface temperatures typically reach around 18–22 °C, making the water feel reasonably comfortable, particularly in sheltered areas. During spring and autumn, temperatures usually sit between 14–18 °C. In winter, the lake cools noticeably, with water temperatures commonly around 10–13 °C, which feels cold and limits the time most people are happy to spend in the water.

Swimming Conditions

Swimming in Lake Atiamuri is allowed and is generally more comfortable than in fast-flowing river sections, as the lake has calmer, slower-moving water. Summer is the best time for swimming, when warmer temperatures and stable conditions suit casual dips and longer swims. Access is more limited than at larger recreational lakes, and steep banks are common, so swimming is best done from known entry points. As with other hydro lakes, water levels can change, and conditions near outlets are not suitable for swimming. Overall, Lake Atiamuri offers pleasant summer swimming opportunities for those familiar with the area, while cooler months are better suited to short swims or enjoying the lake from the shoreline.

Nearby Places

Frequently Asked Questions

What is the current water temperature in Waikato River at Lake Atiamuri?

The water temperature in Waikato River at Lake Atiamuri today is 12°C.

What is the water temperature in Waikato River at Lake Atiamuri during the summer months?

In summer, water temperatures in Waikato River at Lake Atiamuri at Wangi Wangi typically range from 13°C to 24°C.

Is it possible to swim in Waikato River at Lake Atiamuri (Waikato Region)?

Yes — you can swim in the Waikato River at Lake Atiamuri, particularly in fair weather, but the water is often cool even in summer and can be uncomfortably cold outside the warmer months. Always check local signage and council notices (e.g. Waikato Regional Council) for water-quality and safety advisories, avoid the dam, slipways and boat lanes, and be mindful of strong currents and boat traffic.