Swan River – current river water temperature and swimming conditions
This page shows the current river water temperature at Swan River in Western Australia. You can explore recent temperature trends, typical monthly ranges, and historical averages for this date. The page also includes a 7-day water temperature forecast, local weather conditions, and an overview of how suitable the river is for swimming.
Current Water Temperature
The water temperature in Swan River today is 25°C.
Water Temperature in Swan River: Daily Trends, Historical Records, and Forecast
✅ River water between 20 and 25°C is ideal for swimming and offers very comfortable conditions for most people. Combined with warm air temperatures and settled weather, this range is perfect for extended swims and family-friendly activities. Rivers may still feel slightly cooler than lakes due to gentle currents, which many swimmers find refreshing. Even on partly cloudy days, swimming remains enjoyable.
Water Temperature Over the Last 30 Days
While water temperatures in Swan River declined overall during the past month, they have shown a noticeable rebound over the last week.
According to our forecast, the water temperature in Swan River will be 24.9°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 |
|---|---|---|---|
| Mar 12 | 22.5°C | 25.0°C | |
| Mar 13 | 22.3°C | 25.0°C | |
| Mar 14 | 24.2°C | 25.0°C | |
| Mar 15 | 24.0°C | 25.0°C | |
| Mar 16 | 23.4°C | 25.0°C | |
| Mar 17 | 23.4°C | 25.0°C | |
| Mar 18 | 24.4°C | 25.0°C | |
| Mar 19 | 24.3°C | 25.0°C | |
| Mar 20 | 24.5°C | 25.0°C | 24.5°C |
| Mar 21 | 25.0°C | 24.6°C | |
| Mar 22 | 25.0°C | 24.6°C | |
| Mar 23 | 25.0°C | 24.7°C | |
| Mar 24 | 25.0°C | 24.8°C | |
| Mar 25 | 25.0°C | 24.8°C | |
| Mar 26 | 25.0°C | 24.9°C | |
| Mar 27 | 25.0°C | 24.9°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 | 28°C | 29°C |
| February | 23°C | 27°C | 30°C |
| March | 21°C | 25°C | 32°C |
| April | 19°C | 21°C | 23°C |
| May | 15°C | 18°C | 19°C |
| June | 13°C | 16°C | 18°C |
| July | 12°C | 15°C | 16°C |
| August | 13°C | 15°C | 17°C |
| September | 14°C | 18°C | 21°C |
| October | 19°C | 21°C | 24°C |
| November | 23°C | 25°C | 28°C |
| December | 25°C | 27°C | 29°C |
Swan River: Water Temperature by Location
Fremantle
Perth
Location & Local Information
Source confluence Avon River with Wooroloo Brook
• location below Mount Mambup
• coordinates 31°44′34″S 116°4′3″E
• elevation 53 m (174 ft)
Mouth Indian Ocean
• location Fremantle
• coordinates 32°4′25″S 115°42′52″E
• elevation 0 m (0 ft)
Length 72 km (45 mi)
The Swan River winds its way through Perth and surrounding wetlands, shaped by a Mediterranean climate that brings warm, dry summers and mild winters. Water temperatures follow this seasonal pattern closely. In summer, the river typically warms to around 22–26°C, especially in the upper reaches and sheltered bays where the water is calmer and shallower. Spring and autumn usually sit in the 18–22°C range, which many people still find comfortable for a swim on a sunny day. During winter, temperatures commonly drop to about 14–17°C, making the water feel cool but not icy by Australian standards.
Swimming Conditions
Swimming in the Swan River is generally allowed, but conditions vary depending on location and time of year. Designated swimming areas and quieter sections away from heavy boat traffic are the preferred spots, particularly in summer when water temperatures are at their highest. The river is mostly slow-moving, which suits casual swimming, though tidal influence can affect water clarity and temperature closer to the estuary. After heavy rain, runoff can temporarily reduce water quality, so swimming is best avoided then. In settled conditions, the Swan River offers a relaxed and accessible swimming option, providing warm, sheltered water compared with the often windier and rougher conditions along the open coast.