Casterton – water temperature at Glenelg River
This page provides up-to-date information about the water temperature at Casterton, located on the Glenelg River in Victoria. 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 Glenelg River at Casterton today is 13°C.
Water Temperature in Glenelg River at Casterton: 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 Casterton 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 Casterton will be 11.6°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 | 14.9°C | 12.0°C | |
| Apr 29 | 14.8°C | 12.0°C | |
| Apr 30 | 13.8°C | 12.0°C | |
| May 1 | 13.6°C | 12.0°C | |
| May 2 | 14.1°C | 12.0°C | |
| May 3 | 14.0°C | 12.0°C | |
| May 4 | 13.9°C | 12.0°C | |
| May 5 | 13.8°C | 12.0°C | |
| May 6 | 13.3°C | 12.0°C | 13.3°C |
| May 7 | 12.0°C | 13.1°C | |
| May 8 | 12.0°C | 12.8°C | |
| May 9 | 12.0°C | 12.6°C | |
| May 10 | 12.0°C | 12.3°C | |
| May 11 | 12.0°C | 12.1°C | |
| May 12 | 12.0°C | 11.8°C | |
| May 13 | 12.0°C | 11.6°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 | 19°C | 22°C | 24°C |
| February | 18°C | 20°C | 23°C |
| March | 15°C | 18°C | 21°C |
| April | 13°C | 15°C | 17°C |
| May | 10°C | 12°C | 14°C |
| June | 9°C | 10°C | 11°C |
| July | 9°C | 9°C | 10°C |
| August | 9°C | 11°C | 12°C |
| September | 12°C | 13°C | 15°C |
| October | 14°C | 16°C | 18°C |
| November | 16°C | 18°C | 21°C |
| December | 17°C | 20°C | 22°C |
Location & Local Information
Casterton sits along the upper reaches of the Glenelg River in south-west Victoria, where the water is fresh and influenced by the region’s mild, temperate climate. Water temperatures here change steadily with the seasons. In summer, from December to February, the river around Casterton usually sits at about 18–22°C, occasionally feeling a little warmer in slow pools during hot weather. Spring and autumn are cooler, with temperatures generally in the 14–18°C range. Winter brings the coldest conditions, often dropping to around 10–13°C, which feels brisk but manageable on a clear day. Being further upstream, the water here tends to be slightly cooler and clearer than in the lower river.
Swimming Conditions
Swimming in the Glenelg River at Casterton is allowed and is a familiar summer pastime for locals. When the weather warms up, the water temperature is comfortable enough for a proper swim, especially in calmer sections with easy access. The river’s gentle flow makes it more approachable than many faster Victorian rivers, and water quality is usually good. That said, care is still needed. After rain, currents can pick up and visibility can drop, and there are deep holes and submerged logs in places. Choosing settled weather and well-known spots helps make swimming around Casterton both enjoyable and safe.