Portage (IN) Temperature by Month

The average annual maximum temperature in Portage, Indiana, United States of America is 15°C (59°F), with daytime highs ranging from 0°C (32°F) in January to 28°C (82°F) in July. This page covers monthly averages, day-night differences, and how Portage compares to cities worldwide.

Depending on the time of the year, temperatures range from warm to very cold in Portage. Nighttime lows follow the same pattern, ranging from 18°C (64°F) to -8°C (18°F).

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

The coldest point of the day usually falls between 4 AM and 6 AM, with temperatures peaking around 3 PM.

The chart below shows the average temperature throughout the year:

Portage's average annual maximum temperature is 15°C (59°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.

Queenstown, New Zealand averages 10°C (50°F) annually, remember seasons are flipped, so its coldest months fall in June and July.

Osaka, Japan averages 22°C (72°F) annually, with hot humid summers, mild winters, and pleasant spring and autumn seasons.

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

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 Portage this rarely lasts long on the ground.

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