Highlands Ranch (CO) Temperature by Month
The average annual maximum temperature in Highlands Ranch, Colorado, United States of America is 18°C (64°F), with daytime highs ranging from 6°C (43°F) in December to 31°C (88°F) in July. This page covers monthly averages, day-night differences, and how Highlands Ranch compares to cities worldwide.
Highlands Ranch Monthly Temperatures
Depending on the time of the year, temperatures range from very warm to cold in Highlands Ranch. At night, minimum temperatures range from 15°C (59°F) in July to -8°C (18°F) in December.
The chart below illustrates the average maximum day and minimum night temperatures in Highlands Ranch 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 323 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Highlands Ranch vs the United States of America
The map below shows the annual temperature across the United States of America. You can also select individual months if you want to compare a specific time of year.
very warm
warm
pleasant
moderate
cold
very cold
Highlands Ranch vs World: Temperature Compared
Highlands Ranch's average annual maximum temperature is 18°C (64°F). To put that in context, here's how it compares to a few well-known destinations:
Rome, Italy averages 20°C (68°F) annually, with reliably warm summers and comfortable winters.
Reykjavík, Iceland averages 9°C (48°F) a year — mild summers by Icelandic standards, but cold winters and frequent wind.
Buenos Aires, Argentina averages 23°C (73°F) a year, with hot summers and mild winters — and seasons reversed compared to Europe.
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 Highlands Ranch?
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 Highlands Ranch, December is the coolest month, with average highs of 6°C (43°F) and humidity around 56% — considered moderate. In July, the warmest month, temperatures average 31°C (88°F) with 46% 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.
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 Highlands Ranch this rarely lasts long on the ground.
For more on Highlands Ranch's weather — including monthly rainfall, sunshine hours, and humidity — visit our Highlands Ranch climate page.
