Climate Insights for Terni

The climate in Terni is temperate. The average annual temperature is 13°C and approximately 1103mm of precipitation falls per year. Terni receives a notable amount of rainfall throughout the year, including during its driest month. Terni is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, June. The coldest months are January, December, February, when temperatures can drop to 0°C. Light snow can occur between January and December.

Temperatures in Terni vary considerably across the year, with a 29°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 29°C and the mean temperature sits around 23°C. January is the coolest month, with minimum temperatures around 0°C and an average of 4°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs. The sharpest temperature change occurs between May and June, with a 5°C shift in average temperatures.

Terni is a moderately rainy area, receiving approximately 1103mm of precipitation annually, which averages out to around 92mm per month. The wettest month is November, averaging 137mm of rainfall. December and May also tend to see above-average precipitation. The driest month is July, with just 34mm. That's 103mm less than November, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall. Light snowfall can occur between January and December, totalling around 42cm annually. January is the snowiest month with approximately 13cm.

Terni is relatively calm, with an average annual wind speed of 2km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is March, averaging 2km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 0km/h between the calmest and windiest months.

It is currently summer in Terni, which began on June 21, 2026. Terni is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 29°C, while the coldest stretch bottoms out in January near 0°C. Autumn is next, beginning on September 23, 2026 — 93 days from now.

The best time to visit Terni is during June, July and August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 22°C with modest rainfall averaging 47mm per month. By contrast, January can be quite cold with temperatures dropping to 0°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Terni based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.