Hillsborough Temperature by Month

The average annual maximum temperature in Hillsborough, Down County, United Kingdom is 14°C (57°F), with daytime highs ranging from 9°C (48°F) in January to 19°C (66°F) in July. This page covers monthly averages, day-night differences, and how Hillsborough compares to cities worldwide.

The moderate changes in the climate in Hillsborough ensure gradual weather shifts through each season. At night, temperatures drop to between 12°C (54°F) and 3°C (37°F) depending on the time of year.

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

Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM. July, the warmest month, sees 148 hours of sunshine.

The chart below shows the average temperature throughout the year:

Hillsborough'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:

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

Zermatt, Switzerland averages just 4°C (39°F) annually due to its altitude, with very cold winters and cool summers even at its warmest.

Beijing, China averages 20°C (68°F) annually, but with big seasonal swings, very cold winters and hot summers.

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 Hillsborough, January is the coolest month, with average highs of 9°C (48°F) and humidity around 89%, considered 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.

For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained, so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.

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