September weather forecastTerni, Italy
September
Weather in September
September in Terni is a transition period where the heat of summer slowly fades into autumn. There's a perceptible change from the highs of August, and while warm weather is still present, the excessive heat is replaced with more temperate conditions. The weather begins to recalibrate, reducing the maximum temperature to 24.7°C (76.5°F). This sees the city take on a fresh look, with the cultural landscape adapting to the seasonal shift. The progression into September introduces a climate gentle enough for sightseeing, leading to the cooler months of October.Temperature
During the transition into September, Terni observes a decrease in the average high-temperature, falling from a hot 30.8°C (87.4°F) in August to a moderately hot 24.7°C (76.5°F). An average nighttime temperature of 12.9°C (55.2°F) is recorded in Terni during September.Humidity
In Terni, the average relative humidity in September is 69%.Rainfall
In Terni, during September, the rain falls for 10.7 days and regularly aggregates up to 30mm (1.18") of precipitation. Throughout the year, there are 137.2 rainfall days, and 415mm (16.34") of precipitation is accumulated.Snowfall
In Terni, snow does not fall in January, March through October.Daylight
In September, the average length of the day in Terni is 12h and 29min.On the first day of September in Terni, sunrise is at 06:34 and sunset at 19:43. On the last day of the month, sunrise is at 07:06 and sunset at 18:52 CEST.
Sunshine
The average sunshine in September in Terni, Italy, is 10.8h.UV index
In Terni, Italy, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: A maximum UV index of 5 in September translates into the following recommendations:
Act with care - Obligation to protect against skin and eye damage is highlighted. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Terni, Italy
- Average high temperature in September: 24.7°C
The warmest month (with the highest average high temperature) is August (30.8°C).
The month with the lowest average high temperature is January (8.8°C).
- Average low temperature in September: 12.9°C
The month with the highest average low temperature is August (16.3°C).
The coldest month (with the lowest average low temperature) is January (1.3°C).
Average pressure in September
Terni, Italy
- Average pressure in September: 1015.6mbar
The month with the highest atmospheric pressure is December (1018.5mbar).
The month with the lowest atmospheric pressure is July (1013.8mbar).
Average wind speed in September
Terni, Italy
- Average wind speed in September: 7.8km/h
The windiest month (with the highest average wind speed) is February (10.7km/h).
The calmest months (with the lowest average wind speed) are July and August (7.1km/h).
Average humidity in September
Terni, Italy
- Average humidity in September: 69%
The month with the highest relative humidity is November (81%).
The month with the lowest relative humidity is August (59%).
Average rainfall in September
Terni, Italy
- Average rainfall in September: 30mm
The wettest month (with the highest rainfall) is November (55mm).
The driest month (with the least rainfall) is August (19mm).
Average rainfall days in September
Terni, Italy
- Average rainfall days in September: 10.7 days
The month with the highest number of rainy days is May (15.7 days).
The month with the least rainy days is August (7.8 days).
Average snowfall in September
Terni, Italy
- Average snowfall in September: 0mm
The month with the highest snowfall is February (22mm).
The months with the least snowfall are January, March, April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Terni, Italy
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.4 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Terni, Italy
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 10h and 48min
The months with the most sunshine are July and August (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 0min).
Average sunshine days in September
Terni, Italy
- Average sunshine days in September: 16.5 days
The month with the most sunshine days is August (20.9 days).
The month with the least sunshine days is May (12.6 days).
Average UV index in September
Terni, Italy
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 2).
Average cloud cover in September
Terni, Italy
- Average cloud cover in September: 20
The month with the most cloud cover is February (Cloud cover 37).
The month with the least cloud cover is August (Cloud cover 11).
Average visibility in September
Terni, Italy
- Average visibility in September: 9km
The months with the highest visibility are June, July and August (10km).
The months with the lowest visibility are January, February, March, April, May, September, October, November and December (9km).
