Whangaehu River – current water temperature and swimming conditions

This page provides information about the current water temperature at Whangaehu River in Manawatū–Whanganui. 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

13.0°C

Today

13.4°C

Yesterday

15.1°C

A Week Ago

The water temperature in Whangaehu River today is 13°C.

Water Temperature in Whangaehu River: 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 Whangaehu River 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 Whangaehu River will be 12.1°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	13.2°C	12.0°C
May 7	13.2°C	12.0°C
May 8	15.1°C	12.0°C
May 9	15.2°C	12.0°C
May 10	15.2°C	12.0°C
May 11	15.2°C	12.0°C
May 12	15.0°C	12.0°C
May 13	13.4°C	12.0°C
May 14	13.0°C	12.0°C	13.0°C
May 15		12.0°C	12.9°C
May 16		12.0°C	12.8°C
May 17		12.0°C	12.6°C
May 18		12.0°C	12.5°C
May 19		12.0°C	12.4°C
May 20		12.0°C	12.3°C
May 21		12.0°C	12.1°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	17°C	22°C	27°C
February	13°C	20°C	27°C
March	13°C	19°C	24°C
April	10°C	15°C	19°C
May	8°C	12°C	16°C
June	4°C	9°C	14°C
July	4°C	9°C	13°C
August	6°C	10°C	13°C
September	8°C	12°C	16°C
October	10°C	15°C	19°C
November	11°C	17°C	23°C
December	14°C	20°C	25°C

Whangaehu River: Weather Forecast

May 15

4°C / 14°C

partly cloudy

rain: 0% | wind: 6 km/h

May 16

3°C / 13°C

partly cloudy

rain: 0% | wind: 10 km/h

May 17

3°C / 12°C

overcast

rain: 0% | wind: 7 km/h

May 18

5°C / 15°C

partly cloudy

rain: 0% | wind: 14 km/h

May 19

2°C / 15°C

mainly clear

rain: 0% | wind: 13 km/h

Location & Local Information

Source Crater lake • location Mount Ruapehu • coordinates 39°17′2″S 175°33′50″E • elevation 2,550 metres (8,370 ft) Mouth Tasman Sea • coordinates 40°2′28″S 175°6′0″E • elevation Sea level Length 161 kilometres

The Whangaehu River flows from the slopes of Mount Ruapehu across the central plateau and lower plains before reaching the Tasman Sea, making it a distinctive river within the Manawatū–Whanganui. Water temperature in the Whangaehu River is strongly influenced by its volcanic source and elevation. In summer, temperatures typically range from about 14–18 °C, feeling cool even on hot days. During spring and autumn, the water usually sits between 10–14 °C. In winter, temperatures often drop to around 6–9 °C, making the river very cold and limiting comfort for most people.

Swimming Conditions

Swimming in the Whangaehu River is allowed, but it is relatively uncommon compared with other rivers in the region. The river is known for its mineral-rich, often cloudy water and variable flow, which can affect both comfort and safety. In summer, short swims are possible in calm, shallow sections during settled weather, mainly for cooling off rather than extended swimming. After heavy rain or volcanic activity upstream, conditions can change quickly, with stronger currents and reduced water quality. Outside the warmer months, cold temperatures and increased flow generally discourage swimming altogether. Overall, the Whangaehu River offers limited summer swimming opportunities in suitable spots, while for much of the year it is better appreciated for its unique volcanic character and as part of the wider river landscape rather than as a regular swimming destination.

Nearby Rivers

Frequently Asked Questions

What is the current water temperature in Whangaehu River?

The water temperature in Whangaehu River today is 13°C.

What is the water temperature in Whangaehu River during the summer months?

In summer, water temperatures in Whangaehu River at Wangi Wangi typically range from 13°C to 27°C.

Is it possible to swim in Whangaehu River (Manawatū–Whanganui)?

Swimming is possible in some calmer lower reaches of the Whangaehu River, but the water is typically very cold year‑round—fed from Mount Ruapehu, snowmelt and springs—and the river can be fast, murky and changeable. Always check local council advisories and signage, avoid swimming after heavy rain or near known lahar paths, go with a buddy and use a wetsuit or lifejacket if you plan to enter the water.