Rakaia River – current water temperature and swimming conditions

This page provides information about the current water temperature at Rakaia River in Canterbury 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

11.9°C

Today

11.9°C

Yesterday

10.6°C

A Week Ago

The water temperature in Rakaia River today is 12°C.

Water Temperature in Rakaia 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 Rakaia River have been on a steady rise over the past month and have continued to climb over the last week.

According to our forecast, the water temperature in Rakaia River will be 8.9°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
Oct 8	10.5°C	8.5°C
Oct 9	10.9°C	8.5°C
Oct 10	10.6°C	8.5°C
Oct 11	10.8°C	8.5°C
Oct 12	10.3°C	8.5°C
Oct 13	10.4°C	8.5°C
Oct 14	11.0°C	8.5°C
Oct 15	11.9°C	8.5°C
Oct 16	11.9°C	8.5°C	11.9°C
Oct 17		8.5°C	11.5°C
Oct 18		8.5°C	11.1°C
Oct 19		8.5°C	10.6°C
Oct 20		8.5°C	10.2°C
Oct 21		8.5°C	9.8°C
Oct 22		8.5°C	9.4°C
Oct 23		8.5°C	8.9°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	10°C	15°C	19°C
February	9°C	14°C	19°C
March	9°C	14°C	18°C
April	6°C	10°C	14°C
May	3°C	8°C	13°C
June	2°C	6°C	10°C
July	1°C	5°C	9°C
August	2°C	6°C	10°C
September	4°C	8°C	11°C
October	4°C	9°C	13°C
November	6°C	11°C	15°C
December	8°C	13°C	17°C

Rakaia River: Weather Forecast

October 17

2°C / 17°C

fog

rain: 0% | wind: 11 km/h

October 18

7°C / 19°C

fog

rain: 0% | wind: 12 km/h

October 19

8°C / 21°C

mainly clear

rain: 6% | wind: 16 km/h

October 20

8°C / 21°C

clear sky

rain: 10% | wind: 18 km/h

October 21

9°C / 21°C

clear sky

rain: 15% | wind: 10 km/h

Location & Local Information

Source Southern Alps Length 150 kilometres

The Rakaia River in the Canterbury Region is one of the South Island’s large braided rivers, flowing from the Southern Alps to the Pacific Ocean. Fed by alpine snow and glacier melt, its water remains cool throughout much of the year. In winter, temperatures are typically around 6–9°C, reflecting its mountain origins. During spring, snowmelt can keep the river chilly, generally between 8 and 12°C. In summer, especially in January and February, water temperatures in lower, slower-moving reaches may rise to around 14–18°C, though it often feels cooler due to the strong current. In autumn, temperatures usually sit between 10 and 15°C before dropping again as winter approaches. Sudden weather changes in the Alps can quickly affect both temperature and flow.

Swimming Conditions

Swimming is allowed in the Rakaia River, but it requires care and local knowledge. The river has powerful currents, shifting gravel channels and cold alpine water, even in summer. While some sheltered side braids and calm edges may be suitable for a brief dip when temperatures reach the mid to high teens, the main channel is generally not ideal for casual swimming. Conditions can change rapidly after rain or snowmelt, so checking river levels and exercising caution is essential before entering the water.

Nearby Rivers

Frequently Asked Questions

What is the current water temperature in Rakaia River?

The water temperature in Rakaia River today is 12°C.

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

In summer, water temperatures in Rakaia River at Wangi Wangi typically range from 8°C to 19°C.

Is it possible to swim in Rakaia River (Canterbury Region)?

Generally you should not swim in the Rakaia River — it’s a wide, braided, glacial‑fed river with very cold water (often 4–12°C even in summer), strong currents and hidden channels/undertows that can quickly overwhelm swimmers. If you do decide to enter the river, stick to sheltered backwaters or recognised swimming holes, check local signage and river reports, never swim alone and consider a wetsuit or lifejacket because conditions and water levels can change rapidly.