September weather forecast
Serravalle, San Marino

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Weather in September

September in Serravalle heralds the advent of autumn. A noticeable drop ensues in temperatures from the summer highs of August, easing back from the intense heat. The average amount of daylight diminishes slightly; however, this does little to affect the overall pleasant weather. Despite these changes, the consistent visibility remains, offering clear views of the city. September's atmospheric conditions reflect a gentle transition from summer to autumn, culminating in comparatively cooler days.

Temperature

September's arrival coincides with a soft drop in the average high-temperature, subtly decreasing from August's warm 28.9°C (84°F) to a still moderately hot 24.1°C (75.4°F). Serravalle's temperature in September lowers to a consistent average of 17.6°C (63.7°F) during the nights.

Humidity

In Serravalle, the average relative humidity in September is 67%.

Rainfall

In Serravalle, during September, the rain falls for 11.5 days and regularly aggregates up to 46mm (1.81") of precipitation. In Serravalle, during the entire year, the rain falls for 139.3 days and collects up to 509mm (20.04") of precipitation.

Snowfall

April through November are months without snowfall.

Daylight

In September, the average length of the day in Serravalle is 12h and 31min.
On the first day of the month, sunrise is at 06:33 and sunset at 19:45. On the last day of September, sunrise is at 07:07 and sunset at 18:52 CEST.

Sunshine

In September, the average sunshine is 10.3h.

UV index

In Serravalle, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: In September, the UV index of 5 transforms into the following advice:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. It's recommended to limit sun exposure when its radiation is at its peak during midday. During bright days, sunglasses that offer UVA and UVB defense are recommended.

Frequently asked questions

What is the average September temperature in Serravalle?

The high-temperature, in September, in Serravalle, records 24.1°C (75.4°F), while the low-temperature is 17.6°C (63.7°F). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, in August is calculated to be 31°C (87.8°F).

What is the average humidity in September in Serravalle?

In September, the average relative humidity is 67%.

How many days does it rain in September in Serravalle?

In Serravalle, San Marino, in September, during 11.5 rainfall days, 46mm (1.81") of precipitation is typically accumulated.

When it does not snow in Serravalle?

In Serravalle, snow does not fall in April through November.

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

The average day length in September in Serravalle, San Marino, is 12h and 31min.

When are sunrise and sunset in September in Serravalle?

In September, on the first day of the month, sunrise is at 06:33 and sunset at 19:45. On the last day of the month, in Serravalle, sunrise is at 07:07 and sunset at 18:52 CEST.

How many hours of sunshine does Serravalle have in September?

In September, the average sunshine duration in Serravalle is 10.3h.

How high is the UV index in September in Serravalle?

In Serravalle, San Marino, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health threat from unprotected exposure to UV radiation.
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
Serravalle, San Marino

Average temperature in September - Serravalle, San Marino
  • Average high temperature in September: 24.1°C

The warmest month (with the highest average high temperature) is August (28.9°C).
The month with the lowest average high temperature is January (9°C).

  • Average low temperature in September: 17.6°C

The month with the highest average low temperature is August (21.2°C).
The coldest month (with the lowest average low temperature) is January (5.3°C).

Average pressure in September
Serravalle, San Marino

Average pressure in September - Serravalle, San Marino
  • Average pressure in September: 1015.6mbar

The month with the highest atmospheric pressure is December (1018.8mbar).
The month with the lowest atmospheric pressure is July (1013.4mbar).

Average wind speed in September
Serravalle, San Marino

Average wind speed in September - Serravalle, San Marino
  • Average wind speed in September: 11.2km/h

The windiest month (with the highest average wind speed) is February (13.8km/h).
The calmest month (with the lowest average wind speed) is August (10.1km/h).

Average humidity in September
Serravalle, San Marino

Average humidity in September - Serravalle, San Marino
  • Average humidity in September: 67%

The month with the highest relative humidity is November (77%).
The month with the lowest relative humidity is August (61%).

Average rainfall in September
Serravalle, San Marino

Average rainfall in September - Serravalle, San Marino
  • Average rainfall in September: 46mm

The wettest month (with the highest rainfall) is May (69mm).
The driest month (with the least rainfall) is August (30mm).

Average rainfall days in September
Serravalle, San Marino

Average rainfall days in September - Serravalle, San Marino
  • Average rainfall days in September: 11.5 days

The month with the highest number of rainy days is May (14.8 days).
The month with the least rainy days is August (9.3 days).

Average snowfall in September
Serravalle, San Marino

Average snowfall in September - Serravalle, San Marino
  • Average snowfall in September: 0mm

The month with the highest snowfall is February (12mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).

Average snowfall days in September
Serravalle, San Marino

Average snowfall days in September - Serravalle, San Marino
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (1 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).

Average daylight in September /
Average sunshine in September
Serravalle, San Marino

Average daylight in September / Average sunshine in September - Serravalle, San Marino
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in September: 10h and 2min

The months with the most sunshine are July and August (Average sunshine: 11h and 36min).
The month with the least sunshine is February (Average sunshine: 5h and 18min).

Average sunshine days in September
Serravalle, San Marino

Average sunshine days in September - Serravalle, San Marino
  • Average sunshine days in September: 16 days

The month with the most sunshine days is August (18.7 days).
The month with the least sunshine days is May (12.6 days).

Average UV index in September
Serravalle, San Marino

Average UV index in September - Serravalle, San Marino
  • Average UV index in September: 5

The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is January (UV index 2).

Average cloud cover in September
Serravalle, San Marino

Average cloud cover in September - Serravalle, San Marino
  • Average cloud cover in September: 22

The months with the most cloud cover are January and February (Cloud cover 45).
The month with the least cloud cover is August (Cloud cover 13).

Average visibility in September
Serravalle, San Marino

Average visibility in September - Serravalle, San Marino
  • Average visibility in September: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

Serravalle, San Marino

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