Mannum Temperature by Month

Mannum, South Australia, Australia has an average annual maximum temperature of 23°C (73°F), ranging from 16°C (61°F) in July to 30°C (86°F) in January. Below you'll find a full monthly breakdown and a comparison with cities worldwide.

In Mannum, temperatures can shift dramatically between warm in summer and mild in winter. Nights follow the same pattern, with lows ranging from 14°C (57°F) in January to 6°C (43°F) in July.

The chart below illustrates the average maximum day and minimum night temperatures in Mannum by month:

Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM. January, the warmest month, sees 326 hours of sunshine.

The chart below shows the average temperature throughout the year:

Mannum's average annual maximum temperature is 23°C (73°F). To put that in context, here's how it compares to a few well-known destinations:

Rome, Italy averages 20°C (68°F) annually, with reliably warm summers and comfortable winters.

Reykjavík, Iceland averages 9°C (48°F) a year, mild summers by Icelandic standards, but cold winters and frequent wind.

Chicago, USA averages 15°C (59°F) annually, known for extreme seasonal swings, from bitterly cold winters to warm summers.

Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In Mannum, July is the coolest month, with average highs of 16°C (61°F) and humidity around 60%, considered high. In January, the warmest month, temperatures average 30°C (86°F) with 36% humidity, conditions that feel low. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Mannum this rarely lasts long on the ground.

For more on Mannum's weather, including monthly rainfall, sunshine hours, and humidity, visit our Mannum climate page.