September weather forecast
Terni, Italy

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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.

Frequently asked questions

What are September temperatures in Terni?

September temperatures vary between a high-temperature of 24.7°C (76.5°F) and a low-temperature of 12.9°C (55.2°F). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which combines air temperature and relative humidity, in August is appraised at 34°C (93.2°F).

What is the average humidity in September in Terni?

In Terni, the average relative humidity in September is 69%.

How much does it rain in Terni in September?

In Terni, Italy, in September, it is raining for 10.7 days, with typically 30mm (1.18") of accumulated precipitation.

When it does not snow in Terni?

In Terni, snow does not fall in January, March through October.

What is the average length of the day in September in Terni?

In September, the average day length in Terni, Italy, is 12h and 29min.

What time are sunrise and sunset in September in Terni?

In September, on the first day of the month, sunrise is at 06:34 and sunset at 19:43. On the last day of the month, in Terni, Italy, sunrise is at 07:06 and sunset at 18:52 CEST.

How long on average sun shines in September in Terni?

In September, the average sunshine duration is 10.8h.

What is the UV index reading in September in Terni?

In September, the average daily maximum UV index in Terni is 5. A UV Index of 3 to 5 symbolizes a medium hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover

Average temperature in September
Terni, Italy

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / Average sunshine in September - Terni, Italy
  • Average daylight in September: 12h and 3min

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 5min

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 - 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 - 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 - 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 - 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).

Terni, Italy

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