Terni Temperature by Month
The average annual maximum temperature in Terni, Umbria, Italy is 19°C (66°F), with daytime highs ranging from 10°C (50°F) in January to 31°C (88°F) in August. This page covers monthly averages, day-night differences, and how Terni compares to cities worldwide.
Terni Monthly Temperatures
In Terni, temperatures can shift dramatically between very warm in summer and cold in winter. Nights follow the same pattern, with lows ranging from 18°C (64°F) in August to 1°C (34°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Terni by month:
The minimum temperature is often recorded between 4 AM and 6 AM, while the highest temperature is usually reached at 3 PM, when the sun's heating effect is strongest. August, the warmest month, gets 254 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Terni vs Italy
The map below shows the annual temperature across Italy. You can also select individual months if you want to compare a specific time of year.
very warm
warm
pleasant
moderate
cold
very cold
Terni vs World: Temperature Compared
Terni's average annual maximum temperature is 19°C (66°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.
San Francisco, USA averages 19°C (66°F) annually, but with little seasonal variation — summers are often cool and foggy, winters mild.
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 Terni?
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 Terni, January is the coolest month, with average highs of 10°C (50°F) and humidity around 83% — considered very high. In August, the warmest month, temperatures average 31°C (88°F) with 69% 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 Terni this rarely lasts long on the ground.
For more on Terni's weather — including monthly rainfall, sunshine hours, and humidity — visit our Terni climate page.
