Heidelberg Temperature by Month
Heidelberg, Victoria, Australia has an average annual maximum temperature of 20°C (68°F), ranging from 14°C (57°F) in July to 27°C (81°F) in January. Below you'll find a full monthly breakdown and a comparison with cities worldwide.
Heidelberg Monthly Temperatures
The climate in Heidelberg is dynamic, ranging widely from moderate in winter to comfortable in summer. Nights are significantly colder, with lows dropping 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 Heidelberg by month:
From around 4 AM to 6 AM temperatures are at their lowest; by 3 PM they've climbed to their daily peak. January, the warmest month, averages 276 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Heidelberg vs Australia
The map below shows the annual temperature across Australia. You can also select individual months if you want to compare a specific time of year.
very warm
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moderate
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Heidelberg vs World: Temperature Compared
Heidelberg's average annual maximum temperature is 20°C (68°F). To put that in context, here's how it compares to a few well-known destinations:
Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.
Interlaken, Switzerland averages 8°C (46°F) a year, with cold winters and cool summers thanks to its Alpine setting.
Boston, USA averages 16°C (61°F) annually, with four distinct seasons and cold winters that rival northern Europe.
Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.
What Does the Temperature Feel Like in Heidelberg?
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 Heidelberg, July is the coolest month, with average highs of 14°C (57°F) and humidity around 63% — considered high. In January, the warmest month, temperatures average 27°C (81°F) with 44% humidity — conditions that feel moderate. 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.
Whether a city sits on the coast or deep inland makes a significant difference to its climate. Coastal areas tend to have more stable temperatures year-round — large bodies of water absorb heat slowly in summer and release it gradually in winter, keeping extremes in check. Cities far from the sea don't benefit from that buffer, which is why continental climates tend to have hotter summers and colder winters than their coastal counterparts at the same latitude.
For more on Heidelberg's weather — including monthly rainfall, sunshine hours, and humidity — visit our Heidelberg climate page.
