September weather forecastAosta, Italy

September

Weather in September

September, the first month of the autumn in Aosta, is also a fresh month, with an average temperature fluctuating between 3.4°C (38.1°F) and 12°C (53.6°F).

Temperature

The start of September involves a subtle temperature drop, shifting from an enjoyable 16.3°C (61.3°F) in August to a cool 12°C (53.6°F). An average nighttime temperature of 3.4°C (38.1°F) is noted in Aosta during the month of September.

Humidity

In September, the average relative humidity is 80%.

Rainfall

The month with the least rainfall is September, when the rain falls for 19.8 days and typically collects 77mm (3.03") of precipitation.

Snowfall

In Aosta, snow does not fall in June through September.

Daylight

The average length of the day in September is 12h and 32min.
On the first day of the month, sunrise is at 06:52 and sunset at 20:08. On the last day of September, sunrise is at 07:28 and sunset at 19:12 CEST.

Sunshine

In September, the average sunshine is 8.5h.

UV index

In September, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: In September, the maximum UV index of 2 suggests this advice:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Employ a wide-brim hat for potent defense against up to 50% of UV rays.

Updated: Jan 30, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

September temperatures in Aosta, Italy, vary between a high-temperature of 12°C (53.6°F) and a low-temperature of 3.4°C (38.1°F).

In September, the average relative humidity in Aosta is 80%.

The month with the least rainfall in Aosta, Italy, is September, when the rain falls for 19.8 days and typically collects 77mm (3.03") of precipitation.

In Aosta, in September, during 19.8 rainfall days, 77mm (3.03") of precipitation is typically accumulated.

In Aosta, Italy, snow does not fall in June through September.

In Aosta, in September, it doesn't snow. In October, it regularly snows.

The average day length in September in Aosta, Italy, is 12h and 32min.

In September, on the first day of the month, sunrise is at 06:52 and sunset at 20:08. On the last day of the month, sunrise is at 07:28 and sunset at 19:12 CEST.

In Aosta, Italy, the average sunshine duration in September is 8.5h.

In Aosta, Italy, the average daily maximum UV index in September is 2. A UV Index estimate of 2, and below, represents a low health risk from unprotected exposure to UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

16.3°C

12°C

7.5°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

6.3km/h

6.4km/h

7.7km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

6.8

8.2

11.7

Average UV index

Average cloud cover

Average visibility

Average temperature in September
Aosta, Italy

Average high temperature in September: 12°C

The warmest month (with the highest average high temperature) is July (16.5°C).
The month with the lowest average high temperature is January (-2.7°C).

Average low temperature in September: 3.4°C

The months with the highest average low temperature are July and August (6.5°C).
The coldest months (with the lowest average low temperature) are January and February (-10.8°C).

Average pressure in September
Aosta, Italy

Average pressure in September: 1017.8mbar

The month with the highest atmospheric pressure is December (1020.7mbar).
The month with the lowest atmospheric pressure is April (1014.9mbar).

Average wind speed in September
Aosta, Italy

Average wind speed in September: 6.1km/h

The windiest month (with the highest average wind speed) is December (9km/h).
The calmest month (with the lowest average wind speed) is August (5.6km/h).

Average humidity in September
Aosta, Italy

Average humidity in September: 80%

The month with the highest relative humidity is March (87%).
The months with the lowest relative humidity are July and August (77%).

Average rainfall in September
Aosta, Italy

Average rainfall in September: 77mm

The wettest month (with the highest rainfall) is May (181mm).
The driest month (with the least rainfall) is September (77mm).

Average rainfall days in September
Aosta, Italy

Average rainfall days in September: 19.8 days

The month with the highest number of rainy days is May (27 days).
The month with the least rainy days is December (14.9 days).

Average snowfall in September
Aosta, Italy

Average snowfall in September: 0mm

The month with the highest snowfall is February (175mm).
The months with the least snowfall are June, July, August and September (0mm).

Average snowfall days in September
Aosta, Italy

Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (10.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Aosta, Italy

Average daylight in September: 12h and 30min

The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 48min).

Average sunshine in September: 8h and 30min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is November (Average sunshine: 5h and 12min).