Hamilton (ON) Temperature by Month

The average annual maximum temperature in Hamilton, Ontario, Canada is 14°C (57°F), with daytime highs ranging from 1°C (34°F) in January to 27°C (81°F) in July. This page covers monthly averages, day-night differences, and how Hamilton compares to cities worldwide.

Visitors to Hamilton will encounter a climate influenced by big temperature differences across the year. Nighttime temperatures range from 17°C (63°F) in July to -8°C (18°F) in January.

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

Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM. July, the city's warmest month, sees 305 hours of sunshine.

The chart below shows the average temperature throughout the year:

Hamilton's average annual maximum temperature is 14°C (57°F). To put that in context, here's how it compares to a few well-known destinations:

Seville, Spain averages 23°C (73°F) a year, one of the warmer cities in Western Europe, with long hot summers.

Glasgow, Scotland averages 13°C (55°F) a year, mild but often grey, with cold winters and rarely hot summers.

Boston, USA averages 16°C (61°F) annually, with four distinct seasons and cold winters that rival northern Europe.

Tokyo, Japan averages 21°C (70°F) a year, with hot summers, cool winters, and a well-defined cherry blossom spring.

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 Hamilton this rarely lasts long on the ground.

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