Grafton – water temperature at Clarence River

This page provides up-to-date information about the water temperature at Grafton, located on the Clarence River in New South Wales. Here you can check current conditions, view recent temperature trends, explore typical monthly ranges, and compare today’s reading with historical averages for this date. The page also includes a 7-day water temperature forecast, local weather information, and swimming conditions.

Current Water Temperature

15.1°C

Today

15.0°C

Yesterday

16.0°C

A Week Ago

The water temperature in Clarence River at Grafton today is 15°C.

Water Temperature in Clarence River at Grafton: 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 Grafton 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 Grafton will be 15.2°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
Jun 13	16.1°C	15.0°C
Jun 14	16.0°C	15.0°C
Jun 15	16.0°C	15.0°C
Jun 16	16.1°C	15.0°C
Jun 17	16.0°C	15.0°C
Jun 18	15.9°C	15.0°C
Jun 19	15.7°C	15.0°C
Jun 20	15.0°C	15.0°C
Jun 21	15.1°C	15.0°C	15.1°C
Jun 22		15.0°C	15.1°C
Jun 23		15.0°C	15.1°C
Jun 24		15.0°C	15.1°C
Jun 25		15.0°C	15.2°C
Jun 26		15.0°C	15.2°C
Jun 27		15.0°C	15.2°C
Jun 28		15.0°C	15.2°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 Australia to improve accuracy.

Monthly Water Temperature Range (Min, Max & Average)

Month	Today	Yesterday	A Week Ago
January	25°C	27°C	29°C
February	23°C	26°C	29°C
March	21°C	24°C	27°C
April	18°C	21°C	25°C
May	13°C	18°C	22°C
June	11°C	15°C	18°C
July	10°C	14°C	16°C
August	12°C	16°C	20°C
September	15°C	20°C	22°C
October	20°C	23°C	25°C
November	22°C	25°C	27°C
December	25°C	26°C	28°C

Location & Local Information

Grafton sits well upstream on the broad bends of the Clarence River, where the river feels more relaxed and less tidal than closer to the coast. Water temperatures here reflect the warm subtropical climate of northern New South Wales. In summer, from December to February, the river around Grafton is usually a comfortable 22–26°C, and in slow pools it can feel a touch warmer during extended hot weather. Spring and autumn are mild, with water temperatures generally in the 18–23°C range. Winter is cooler but still fairly gentle by Australian standards, typically sitting around 15–19°C, especially in deeper sections where temperatures don’t change too quickly.

Swimming Conditions

Swimming in the Clarence River at Grafton is allowed and quite common, particularly in summer when air temperatures climb and the river becomes a natural place to cool off. Locals often use familiar river beaches and calmer stretches where the current is manageable and access is easy. In the warmer months, the water temperature is usually pleasant enough for a proper swim, not just a quick dip. As with any large river, conditions can vary. After heavy rain, flows can increase and visibility can drop, and there are deep holes and submerged snags to watch out for. With sensible spot choice and settled weather, swimming around Grafton is both enjoyable and refreshing.

Nearby Places

Frequently Asked Questions

What is the current water temperature in Clarence River at Grafton?

The water temperature in Clarence River at Grafton today is 15°C.

What is the water temperature in Clarence River at Grafton during the summer months?

In summer, water temperatures in Clarence River at Grafton typically range from 23°C to 29°C.

Is it possible to swim in Clarence River at Grafton (New South Wales)?

Yes — you can swim in the Clarence River at Grafton in many calm spots, but conditions change with tides, currents, river flow and submerged hazards so stick to sheltered or marked swimming areas. Always check local council or NSW Health water-quality warnings and signage, avoid swimming after heavy rain, keep clear of boat channels and strong currents, and swim with a mate or wear a lifejacket if unsure.