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
The water temperature in Clarence River at Grafton today is 19°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 18.1°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 |
|---|---|---|---|
| Apr 28 | 20.1°C | 18.0°C | |
| Apr 29 | 20.0°C | 18.0°C | |
| Apr 30 | 19.9°C | 18.0°C | |
| May 1 | 19.3°C | 18.0°C | |
| May 2 | 19.5°C | 18.0°C | |
| May 3 | 19.4°C | 18.0°C | |
| May 4 | 19.3°C | 18.0°C | |
| May 5 | 19.3°C | 18.0°C | |
| May 6 | 19.4°C | 18.0°C | 19.4°C |
| May 7 | 18.0°C | 19.2°C | |
| May 8 | 18.0°C | 19.0°C | |
| May 9 | 18.0°C | 18.8°C | |
| May 10 | 18.0°C | 18.7°C | |
| May 11 | 18.0°C | 18.5°C | |
| May 12 | 18.0°C | 18.3°C | |
| May 13 | 18.0°C | 18.1°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 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.