Lake Joondalup – current water temperature and swimming conditions

This page provides information about the current water temperature at Lake Joondalup in Western Australia. Here you can view recent temperature trends on a 30-day chart, check typical monthly water temperature ranges, and compare today’s reading with historical averages for this date. A 7-day water temperature forecast, local weather conditions, and an overview of swimming suitability are also included.

Current Water Temperature

14.8°C

Today

15.9°C

Yesterday

18.0°C

A Week Ago

The water temperature in Lake Joondalup today is 15°C.

Water Temperature in Lake Joondalup: Daily Trends, Historical Records, and Forecast

⚠️ Lake temperatures between 10 and 15°C are cold but can be manageable for short swims on sunny, warm days. Shallow areas may feel slightly warmer, while deeper sections remain cold and slow to warm up. Most swimmers keep sessions brief, and wetsuits are often used for comfort. Wind and cooler air temperatures can quickly reduce how pleasant the swim feels.

Water Temperature Over the Last 30 Days

Water temperatures in Lake Joondalup 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 Lake Joondalup will be 17.5°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	18.0°C	17.9°C
Apr 29	18.0°C	17.9°C
Apr 30	18.0°C	17.9°C
May 1	18.0°C	17.9°C
May 2	18.0°C	17.9°C
May 3	16.6°C	17.9°C
May 4	16.1°C	17.9°C
May 5	15.9°C	17.9°C
May 6	14.8°C	17.9°C	14.8°C
May 7		17.9°C	15.2°C
May 8		17.9°C	15.6°C
May 9		17.9°C	16.0°C
May 10		17.9°C	16.4°C
May 11		17.9°C	16.7°C
May 12		17.9°C	17.1°C
May 13		17.9°C	17.5°C

* Current - Actual water temperature value

** Average - Average water temperature on this day in recent years

*** Forecast - Our water temperature forecast

Actual lake water temperatures may differ from the reported values by several degrees, particularly during periods of strong winds or rapid weather changes. Wind can mix surface and deeper layers in a lake, bringing cooler water to the surface, while shallow areas may warm more quickly under direct sunlight. Air temperature, sunshine, and cloud cover strongly influence how quickly a lake heats up or cools down. These factors can lead to noticeable temperature variations across different parts of the lake.

Our forecast is based on a proprietary mathematical model that considers real-time lake temperature observations, historical trends, seasonal cycles, wind strength and direction, and region-specific air temperature. To enhance accuracy, we also incorporate data from nearby monitored locations and comparable lakes within Australia.

Monthly Water Temperature Range (Min, Max & Average)

Month	Today	Yesterday	A Week Ago
January	18°C	23°C	32°C
February	18°C	23°C	33°C
March	18°C	22°C	33°C
April	18°C	21°C	27°C
May	14°C	18°C	21°C
June	12°C	18°C	22°C
July	11°C	18°C	22°C
August	13°C	19°C	22°C
September	14°C	19°C	22°C
October	16°C	20°C	26°C
November	19°C	22°C	33°C
December	18°C	22°C	33°C

Location & Local Information

Lake Joondalup sits north of Perth within a chain of coastal wetlands and is shaped by seasonal rainfall and the region’s Mediterranean climate. Being shallow, the lake’s water temperature responds quickly to air temperature and sunshine. In summer, the water can warm to around 20–26°C, sometimes feeling quite warm during prolonged hot spells. Spring and autumn are milder, usually sitting between 16–20°C, while winter temperatures commonly drop to about 12–15°C, giving the lake a cool feel, especially after cold nights. Wind and cloud cover can cause noticeable day-to-day changes, so conditions are rarely consistent for long.

Swimming Conditions

Swimming in Lake Joondalup is generally not allowed and not recommended. Although summer water temperatures may appear suitable, the lake is managed primarily as a conservation wetland rather than a recreational water body. Water quality can vary due to nutrient levels, urban runoff, and periods of algal growth, particularly in warmer months. The lake is also an important habitat for birdlife and other wildlife, and human swimming would disturb the ecosystem. After rainfall, conditions often deteriorate further, with reduced clarity and cooler water. Overall, Lake Joondalup is best appreciated for walking, cycling, and nature observation, with its seasonal water temperatures noted but swimming avoided in favour of safer, managed beaches and rivers nearby.

Nearby Lakes

Frequently Asked Questions

What is the current water temperature in Lake Joondalup?

The water temperature in Lake Joondalup today is 15°C.

What is the water temperature in Lake Joondalup during the summer months?

In summer, water temperatures in Lake Joondalup typically range from 18°C to 33°C.

Is it possible to swim in Lake Joondalup (Western Australia)?

You can swim in Lake Joondalup during the warmer months when water temperatures are pleasant, but it isn’t a designated or patrolled swimming area and conditions can change with algal blooms, stormwater runoff and seasonal variation. Always check local health and park advisories and on‑site signage before entering the water and take extra care as there are no lifeguards—if in doubt, choose a patrolled beach nearby.