September weather forecast
Castellanza, Italy

September

Weather in September

September, the first month of the autumn in Castellanza, is still a pleasant month, with an average temperature varying between 22.8°C (73°F) and 13.6°C (56.5°F).

Temperature

In Castellanza, entering September brings a subtle temperature decrement, reducing from August's moderately hot 27.7°C (81.9°F) to an agreeable 22.8°C (73°F). An average nighttime temperature of 13.6°C (56.5°F) is witnessed throughout September.

Humidity

In September, the average relative humidity in Castellanza is 72%.

Rainfall

In Castellanza, Italy, in September, it is raining for 14.8 days, with typically 72mm (2.83") of accumulated precipitation. Throughout the year, in Castellanza, Italy, there are 178.4 rainfall days, and 1147mm (45.16") of precipitation is accumulated.

Snowfall

In Castellanza, Italy, snow does not fall in April through October.

Daylight

In Castellanza, Italy, the average length of the day in September is 12h and 32min.
On the first day of September, sunrise is at 06:46 and sunset at 20:02. On the last day of the month, sunrise is at 07:22 and sunset at 19:06 CEST.

Sunshine

The average sunshine in September is 9.6h.

UV index

In Castellanza, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: In September, the maximum UV index of 5 suggests these recommendations:
Take precautions - Protection against sunburn is recommended. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.

Frequently asked questions

What are September temperatures in Castellanza?
September temperatures in Castellanza vary between a high-temperature of 22.8°C (73°F) and a low-temperature of 13.6°C (56.5°F). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, in August is calculated to be 30°C (86°F).
What is the average humidity in September in Castellanza?
In Castellanza, Italy, the average relative humidity in September is 72%.
How many days does it rain in September in Castellanza?
In September, in Castellanza, the rain falls for 14.8 days. Throughout September, 72mm (2.83") of precipitation is accumulated.
When it does not snow in Castellanza?
In Castellanza, snow does not fall in April through October.
How many hours of daylight does Castellanza have in September?
The average day length in September in Castellanza is 12h and 32min.
When is the sunrise / sunset in September in Castellanza?
On the first day of September in Castellanza, Italy, sunrise is at 06:46 and sunset at 20:02. On the last day of the month, sunrise is at 07:22 and sunset at 19:06 CEST.
How long on average sun shines in September in Castellanza?
In Castellanza, the average sunshine duration in September is 9.6h.
What is the UV index intensity in September in Castellanza?
The average daily maximum UV index in September in Castellanza, Italy, is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from exposure to the Sun's UV radiation.
Average high temperature
Average low temperature
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility
Average temperature in September - Castellanza, Italy
Average temperature in September
Castellanza, Italy
  • Average high temperature in September: 22.8°C

The warmest month (with the highest average high temperature) is July (27.9°C).
The month with the lowest average high temperature is January (5.6°C).

  • Average low temperature in September: 13.6°C

The month with the highest average low temperature is August (17.7°C).
The coldest month (with the lowest average low temperature) is January (0.6°C).

Average pressure in September - Castellanza, Italy
Average pressure in September
Castellanza, Italy
  • Average pressure in September: 1017.3mbar

The month with the highest atmospheric pressure is December (1020.2mbar).
The month with the lowest atmospheric pressure is April (1014.7mbar).

Average wind speed in September - Castellanza, Italy
Average wind speed in September
Castellanza, Italy
  • Average wind speed in September: 5.7km/h

The windiest month (with the highest average wind speed) is March (6.8km/h).
The calmest month (with the lowest average wind speed) is December (5.4km/h).

Average humidity in September - Castellanza, Italy
Average humidity in September
Castellanza, Italy
  • Average humidity in September: 72%

The month with the highest relative humidity is November (79%).
The months with the lowest relative humidity are April, July and August (70%).

Average rainfall in September - Castellanza, Italy
Average rainfall in September
Castellanza, Italy
  • Average rainfall in September: 72mm

The wettest month (with the highest rainfall) is November (172mm).
The driest month (with the least rainfall) is January (33mm).

Average rainfall days in September - Castellanza, Italy
Average rainfall days in September
Castellanza, Italy
  • Average rainfall days in September: 14.8 days

The month with the highest number of rainy days is May (20.3 days).
The month with the least rainy days is January (8.7 days).

Average snowfall in September - Castellanza, Italy
Average snowfall in September
Castellanza, Italy
  • Average snowfall in September: 0mm

The month with the highest snowfall is February (48mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).

Average snowfall days in September - Castellanza, Italy
Average snowfall days in September
Castellanza, Italy
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (3 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 - Castellanza, Italy
Average daylight in September /
Average sunshine in September
Castellanza, Italy
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).

  • Average sunshine in September: 9h and 4min

The month with the most sunshine is July (Average sunshine: 11h and 36min).
The month with the least sunshine is November (Average sunshine: 5h and 6min).

Average sunshine days in September - Castellanza, Italy
Average sunshine days in September
Castellanza, Italy
  • Average sunshine days in September: 13.4 days

The month with the most sunshine days is December (19.5 days).
The month with the least sunshine days is June (5.9 days).

Average UV index in September - Castellanza, Italy
Average UV index in September
Castellanza, Italy
  • Average UV index in September: 5

The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in September - Castellanza, Italy
Average cloud cover in September
Castellanza, Italy
  • Average cloud cover in September: 28

The month with the most cloud cover is November (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 22).

Average visibility in September - Castellanza, Italy
Average visibility in September
Castellanza, Italy
  • Average visibility in September: 9km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).

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