Newmarket (ON) Temperature by Month
The average annual maximum temperature in Newmarket, Ontario, Canada is 14°C (57°F), with daytime highs ranging from -1°C (30°F) in January to 27°C (81°F) in July. This page covers monthly averages, day-night differences, and how Newmarket compares to cities worldwide.
Newmarket Monthly Temperatures
Visitors to Newmarket will encounter a climate influenced by big temperature differences across the year. Nighttime temperatures range from 15°C (59°F) in July to -11°C (12°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Newmarket by month:
The coolest part of the day is typically between 4 AM and 6 AM, while 3 PM is usually the warmest, when solar heating is at its peak. July, the city's warmest month, averages 280 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Newmarket vs Canada
The map below shows the annual temperature across Canada. You can also select individual months if you want to compare a specific time of year.
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Newmarket vs World: Temperature Compared
Newmarket'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:
Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.
Toronto, Canada averages 13°C (55°F) annually, with cold snowy winters balanced by genuinely warm summers.
New York City, USA averages 17°C (63°F) a year, with hot humid summers and cold winters that bring regular snowfall.
Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate — hot dry summers and mild wet winters.
What Does the Temperature Feel Like in Newmarket?
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 Newmarket, January is the coolest month, with average highs of -1°C (30°F) and humidity around 80% — considered very high. In July, the warmest month, temperatures average 27°C (81°F) with 82% humidity — conditions that feel very 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 Newmarket this rarely lasts long on the ground.
For more on Newmarket's weather — including monthly rainfall, sunshine hours, and humidity — visit our Newmarket climate page.
