Bluffton (IN) Temperature by Month

The average annual maximum temperature in Bluffton, Indiana, United States of America is 16°C (61°F), with daytime highs ranging from 1°C (34°F) in January to 29°C (84°F) in July. This page covers monthly averages, day-night differences, and how Bluffton compares to cities worldwide.

Depending on the time of the year, temperatures range from comfortable to very cold in Bluffton. At night, minimum temperatures range from 17°C (63°F) in July to -9°C (16°F) in January.

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

Daily lows are most common between 4 AM and 6 AM. By 3 PM temperatures reach their daily high, driven by peak solar heating. July, the warmest month of the year, receives 345 hours of sunshine.

The chart below shows the average temperature throughout the year:

Bluffton's average annual maximum temperature is 16°C (61°F). To put that in context, here's how it compares to a few well-known destinations:

Lisbon, Portugal averages 21°C (70°F) annually, warm summers, mild winters, and rain mainly in the cooler months.

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

Shanghai, China averages 21°C (70°F) a year, with warm summers, mild winters, and a noticeable spring and autumn.

Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.

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 the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.

In Bluffton, January is the coolest month, with average highs of 1°C (34°F) and humidity around 75%, considered high. In July, the warmest month, temperatures average 29°C (84°F) with 68% humidity, conditions that feel high. 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 Bluffton this rarely lasts long on the ground.

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