Marmong Picnic Area – water temperature at Lake Macquarie

This page provides up-to-date information about the water temperature at Marmong Picnic Area, located on the Lake Macquarie 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

14.9°C

Today

15.0°C

Yesterday

15.8°C

A Week Ago

The water temperature in Lake Macquarie at Marmong Picnic Area today is 15°C.

Water Temperature in Lake Macquarie at Marmong Picnic Area: 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 Marmong Picnic Area 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 Marmong Picnic Area will be 13.9°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
Jun 13	15.7°C	13.8°C
Jun 14	15.7°C	13.8°C
Jun 15	15.8°C	13.8°C
Jun 16	15.9°C	13.8°C
Jun 17	15.9°C	13.8°C
Jun 18	15.8°C	13.8°C
Jun 19	15.7°C	13.8°C
Jun 20	15.0°C	13.8°C
Jun 21	14.9°C	13.8°C	14.9°C
Jun 22		13.8°C	14.8°C
Jun 23		13.8°C	14.6°C
Jun 24		13.8°C	14.5°C
Jun 25		13.8°C	14.3°C
Jun 26		13.8°C	14.2°C
Jun 27		13.8°C	14.0°C
Jun 28		13.8°C	13.9°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	20°C	26°C	28°C
February	18°C	24°C	28°C
March	16°C	24°C	27°C
April	19°C	21°C	24°C
May	15°C	17°C	20°C
June	12°C	14°C	16°C
July	12°C	13°C	15°C
August	13°C	14°C	17°C
September	16°C	18°C	19°C
October	18°C	21°C	23°C
November	21°C	23°C	25°C
December	21°C	25°C	27°C

Location & Local Information

Marmong Picnic Area sits on the western edge of Lake Macquarie, where water temperatures are strongly influenced by the lake’s broad, shallow layout. Over summer, from December through to February, the water here is usually in the range of about 22–25 °C, making it feel pleasantly warm for a dip. In autumn, temperatures ease back to around 18–21 °C, while winter is noticeably cooler, often sitting between 13 and 16 °C. As spring arrives, the lake gradually warms again, commonly reaching 18–21 °C by late October, depending on sunshine and wind conditions.

Swimming Conditions

Swimming at Marmong Picnic Area is allowed and fairly popular during the warmer months, particularly on calm days. The shoreline here is generally gentle, with quiet water and very little current, which makes it suitable for relaxed swimming rather than anything energetic. It’s not a formal swimming enclosure, so conditions can vary with wind and boat activity, and the water can feel cooler just off the edge in deeper sections. Water quality is usually fine for recreation, though occasional algae alerts can occur in hot, still periods. Overall, Marmong is best suited to casual summer swimming combined with picnicking, rather than being a dedicated swimming spot year-round.

Nearby Places

Frequently Asked Questions

What is the current water temperature in Lake Macquarie at Marmong Picnic Area?

The water temperature in Lake Macquarie at Marmong Picnic Area today is 15°C.

What is the water temperature in Lake Macquarie at Marmong Picnic Area during the summer months?

In summer, water temperatures in Lake Macquarie at Marmong Picnic Area typically range from 18°C to 28°C.

Is it possible to swim in Lake Macquarie at Marmong Picnic Area (New South Wales)?

Yes — you can swim at Marmong Picnic Area on Lake Macquarie, but there are no lifeguards and conditions (tides, wind and water quality) can change, so take usual precautions. Water temperatures are generally cool outside summer (often mid-to-high teens °C) and warmer in summer (low twenties °C), so check local water quality alerts and signage before heading in.