Manganui River – current water temperature and swimming conditions

This page provides information about the current water temperature at Manganui River in Northland 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

16.6°C

Today

15.5°C

Yesterday

17.5°C

A Week Ago

The water temperature in Manganui River today is 17°C.

Water Temperature in Manganui River: Daily Trends, Historical Records, and Forecast

⚠️ A river temperature of 15 to 20°C is generally considered cool to comfortable for swimming in Australia. On warm, calm days, this range allows for relaxed swimming and longer time in the water. Comfort depends heavily on air temperature and sunshine, as cooler weather can still make the water feel chilly. This range is popular for river swimming during spring and early autumn.

Water Temperature Over the Last 30 Days

Water temperatures in Manganui 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 Manganui River will be 14.8°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	17.1°C	14.5°C
May 7	17.1°C	14.5°C
May 8	17.5°C	14.5°C
May 9	17.5°C	14.5°C
May 10	17.5°C	14.5°C
May 11	17.5°C	14.5°C
May 12	17.2°C	14.5°C
May 13	15.5°C	14.5°C
May 14	16.6°C	14.5°C	16.6°C
May 15		14.5°C	16.3°C
May 16		14.5°C	16.1°C
May 17		14.5°C	15.8°C
May 18		14.5°C	15.6°C
May 19		14.5°C	15.3°C
May 20		14.5°C	15.0°C
May 21		14.5°C	14.8°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	16°C	22°C	27°C
February	17°C	22°C	27°C
March	16°C	20°C	24°C
April	14°C	18°C	22°C
May	10°C	15°C	19°C
June	7°C	12°C	16°C
July	6°C	11°C	15°C
August	8°C	12°C	15°C
September	10°C	14°C	18°C
October	11°C	15°C	19°C
November	15°C	19°C	23°C
December	17°C	22°C	26°C

Manganui River: Weather Forecast

May 15

9°C / 17°C

light drizzle

rain: 17% | wind: 19 km/h

May 16

8°C / 17°C

light drizzle

rain: 38% | wind: 20 km/h

May 17

9°C / 16°C

light drizzle

rain: 9% | wind: 17 km/h

May 18

8°C / 16°C

light drizzle

rain: 72% | wind: 16 km/h

May 19

10°C / 17°C

light drizzle

rain: 62% | wind: 22 km/h

May 20

10°C / 18°C

overcast

rain: 8% | wind: 23 km/h

Location & Local Information

The Manganui River in the Northland Region flows through warm, subtropical countryside before reaching the coast. As a northern lowland river, its water temperature reflects the region’s generally mild climate. In winter, temperatures are usually around 11–15°C, remaining milder than many rivers further south. During spring, the river gradually warms to approximately 15–19°C. In summer, particularly in January and February, calmer pools and slower-moving stretches can reach about 20–25°C on hot Northland days. In autumn, temperatures typically ease back to between 16 and 20°C. Heavy rainfall can temporarily lower water temperatures and increase flow, especially in narrower sections.

Swimming Conditions

Swimming is allowed in suitable parts of the Manganui River, and it can be an appealing freshwater option during the warmer months. The most comfortable conditions are generally in mid to late summer when water temperatures exceed 20°C and flows are steady. However, swimmers should be mindful of changing depths, submerged branches and moderate currents in some reaches. After significant rainfall, the river can rise quickly and water clarity may decrease, making conditions less suitable for swimming. Choosing recognised, calm spots and checking local water quality information beforehand helps ensure a safer and more enjoyable experience.

Nearby Rivers

Frequently Asked Questions

What is the current water temperature in Manganui River?

The water temperature in Manganui River today is 17°C.

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

In summer, water temperatures in Manganui River at Wangi Wangi typically range from 16°C to 27°C.

Is it possible to swim in Manganui River (Northland Region)?

Yes — some stretches of the Manganui River in the Northland Region are popular for swimming, especially in sheltered pools during summer, but suitability varies with access, depth and flow. The water is often cool outside the warmest weeks and conditions can change quickly after rain, so check local signs and advice, avoid strong currents, don’t swim alone and use a lifejacket or wetsuit if you’re unsure.