McMahon's Beach – water temperature at Tweed River
This page provides up-to-date information about the water temperature at McMahon's Beach, located on the Tweed 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 Tweed River at McMahon's Beach today is 15°C.
Water Temperature in Tweed River at McMahon's Beach: 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
While water temperatures in McMahon's Beach declined overall during the past month, they have shown a noticeable rebound over the last week.
According to our forecast, the water temperature in McMahon's Beach 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 | 14.2°C | 15.3°C | |
| Jun 14 | 14.3°C | 15.3°C | |
| Jun 15 | 14.4°C | 15.3°C | |
| Jun 16 | 14.3°C | 15.3°C | |
| Jun 17 | 14.1°C | 15.3°C | |
| Jun 18 | 14.1°C | 15.3°C | |
| Jun 19 | 15.1°C | 15.3°C | |
| Jun 20 | 15.0°C | 15.3°C | |
| Jun 21 | 14.6°C | 15.3°C | 14.6°C |
| Jun 22 | 15.3°C | 14.7°C | |
| Jun 23 | 15.3°C | 14.8°C | |
| Jun 24 | 15.3°C | 14.9°C | |
| Jun 25 | 15.3°C | 15.0°C | |
| Jun 26 | 15.3°C | 15.0°C | |
| Jun 27 | 15.3°C | 15.1°C | |
| Jun 28 | 15.3°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 | 23°C | 26°C | 28°C |
| February | 22°C | 25°C | 28°C |
| March | 21°C | 24°C | 27°C |
| April | 18°C | 21°C | 24°C |
| May | 15°C | 18°C | 21°C |
| June | 14°C | 15°C | 17°C |
| July | 13°C | 15°C | 16°C |
| August | 14°C | 16°C | 19°C |
| September | 17°C | 19°C | 21°C |
| October | 19°C | 22°C | 24°C |
| November | 22°C | 24°C | 26°C |
| December | 23°C | 25°C | 27°C |
Location & Local Information
McMahon’s Beach sits along a quiet bend of the Tweed River in northern New South Wales, offering sheltered conditions that contrast with the open coast nearby. Water temperatures here reflect the region’s subtropical climate and are generally comfortable across much of the year. In summer, river temperatures typically rise to around 25–27 °C, making the water feel warm and inviting for long swims. Autumn often holds onto that warmth, with readings commonly between 23–25 °C and fairly stable conditions. Spring starts a little cooler at roughly 21–23 °C before warming steadily. Winter is the coolest period, but even then the river usually sits around 18–21 °C, which many locals still consider pleasant on sunny days.
Swimming Conditions
Swimming is allowed at McMahon’s Beach and is especially popular because of the calm river environment. With no ocean swell and generally gentle currents, it suits relaxed swimming and casual dips, particularly for those who prefer quieter water. The sheltered setting also means the river can feel slightly warmer than the nearby sea, adding to its appeal during the shoulder seasons. Swimmers should still stay aware of tides and occasional boat traffic, but overall McMahon’s Beach provides reliable water temperatures and easy swimming conditions for much of the year.