Nepean River Water Temperature Today
Nepean River, a river swimming spot in New South Wales, Australia. The water reaches comfortable swimming temperatures in high summer, and is mild even in winter.
In August Nepean River averages about 13°C, peaking near 25°C in January, February, March and dropping to roughly 13°C at its coldest.
River and swimming-hole temperatures are modelled from long-term monthly averages and refined with live air temperature, wind and UV. Moving water reacts faster to the weather than a lake or the sea.
Nepean River water temperature by month
| Month | Average water temperature | Swimming |
|---|---|---|
| January | 24.2°C | hot |
| February | 25.0°C | hot |
| March | 24.2°C | hot |
| April | 22.0°C | warm |
| May | 19.0°C | mild |
| June | 16.0°C | mild |
| July | 13.8°C | cool |
| August | 13.0°C | cool |
| September | 13.8°C | cool |
| October | 16.0°C | mild |
| November | 19.0°C | mild |
| December | 22.0°C | warm |
Nepean River swim conditions FAQ
What is the water temperature in Nepean River right now?
In August the water in Nepean River averages about 13°C. We refine that long-term average with today's air temperature, because this river responds quickly to the weather.
When is the best time to swim in Nepean River?
The comfortable swim season — 18°C or warmer — runs through January, February, March, April, May, November, December, with the warmest water in January, February, March at around 25°C.
Can you swim in Nepean River in winter?
Yes, but winter temperatures drop to roughly 13°C. Below 12°C, cold-water shock is the main risk: enter slowly, never swim alone, and limit time in the water.
Is Nepean River safe for swimming?
Moving and inland water carries different risks from the sea: check flow after rain, avoid weirs and undercut banks, look for submerged rocks before jumping, and respect local access rules and water-quality notices.
Water safety tips
- Check the flow rate after heavy rain — inland water can rise and speed up within hours.
- Never jump before checking depth and submerged rocks; levels change through the season.
- Enter slowly to control cold-water shock, and get out before you start shivering.
- Swim with someone else and agree an exit point downstream before you start.
Swim season here: January, February, March, April, May, November, December.
Nearby swim spots
More swim spots in Australia
- Bells Rapids water temperature
- Murray River water temperature
- Yarra River water temperature
- Ovens River water temperature
- Mitta Mitta River water temperature
- Hawkesbury River water temperature
- Bermagui River water temperature
- Jenolan River water temperature
- All rivers & swimming holes
- All lake water temperatures
- Sea temperatures in Australia