September weather forecast
Riville, France

September

Weather in September

The first month of the autumn, September, is also an enjoyable month in Riville, France, with an average temperature fluctuating between 14.6°C (58.3°F) and 17.9°C (64.2°F).

Temperature

A minimal variation is noted in Riville's average high-temperature at the onset of September, reaching a still enjoyable 17.9°C (64.2°F) from August's 19.3°C (66.7°F). An average low-temperature of 14.6°C (58.3°F) characterizes Riville's September nights.

Humidity

September is the least humid month, with an average relative humidity of 78%.

Rainfall

In Riville, during September, the rain falls for 14 days and regularly aggregates up to 37mm (1.46") of precipitation. Throughout the year, there are 185.9 rainfall days, and 521mm (20.51") of precipitation is accumulated.

Snowfall

In Riville, snow does not fall in May through November.

Daylight

In September, the average length of the day in Riville is 12h and 36min.
On the first day of September in Riville, sunrise is at 07:14 and sunset at 20:41. On the last day of the month, sunrise is at 07:56 and sunset at 19:38 CEST.

Sunshine

In Riville, the average sunshine in September is 7.3h.

UV index

The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the average person.
Note: A daily high UV index of 4 in September leads to these guidelines:
Exercise prevention - Warding off sunburn is urged. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

Frequently asked questions

What is the average September temperature in Riville?
An average high-temperature, in September, in Riville, is 17.9°C (64.2°F) and the average low-temperature is 14.6°C (58.3°F).
What is the least humid month in Riville?
With an average relative humidity of 78%, September is the least humid month.
What is the average humidity in September in Riville?
The average relative humidity in September in Riville is 78%.
How much does it rain in Riville in September?
In Riville, during September, the rain falls for 14 days and regularly aggregates up to 37mm (1.46") of precipitation.
When it does not snow in Riville?
May through November are months without snowfall in Riville.
How many hours of daylight does Riville have in September?
In September, the average day length in Riville is 12h and 36min.
What time are sunrise and sunset in September in Riville?
On the first day of September in Riville, sunrise is at 07:14 and sunset at 20:41. On the last day of the month, sunrise is at 07:56 and sunset at 19:38 CEST.
How many hours of sunshine does Riville have in September?
The average sunshine duration in September in Riville is 7.3h.
How high is the UV index in September in Riville?
In September, the average daily maximum UV index in Riville, France, is 4. A UV Index of 3 to 5 symbolizes a moderate vulnerability 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 - Riville, France
Average temperature in September
Riville, France
  • Average high temperature in September: 17.9°C

The warmest month (with the highest average high temperature) is August (19.3°C).
The months with the lowest average high temperature are January and February (8.1°C).

  • Average low temperature in September: 14.6°C

The month with the highest average low temperature is August (16°C).
The coldest month (with the lowest average low temperature) is February (5.2°C).

Average pressure in September - Riville, France
Average pressure in September
Riville, France
  • Average pressure in September: 1018mbar

The month with the highest atmospheric pressure is September (1018mbar).
The month with the lowest atmospheric pressure is November (1012.2mbar).

Average wind speed in September - Riville, France
Average wind speed in September
Riville, France
  • Average wind speed in September: 20.2km/h

The windiest month (with the highest average wind speed) is December (29.2km/h).
The calmest months (with the lowest average wind speed) are July and August (18km/h).

Average humidity in September - Riville, France
Average humidity in September
Riville, France
  • Average humidity in September: 78%

The month with the highest relative humidity is June (83%).
The month with the lowest relative humidity is September (78%).

Average rainfall in September - Riville, France
Average rainfall in September
Riville, France
  • Average rainfall in September: 37mm

The wettest months (with the highest rainfall) are November and December (58mm).
The driest month (with the least rainfall) is April (25mm).

Average rainfall days in September - Riville, France
Average rainfall days in September
Riville, France
  • Average rainfall days in September: 14 days

The month with the highest number of rainy days is December (18.5 days).
The month with the least rainy days is April (12.6 days).

Average snowfall in September - Riville, France
Average snowfall in September
Riville, France
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (6mm).
The months with the least snowfall are May, June, July, August, September, October and November (0mm).

Average snowfall days in September - Riville, France
Average snowfall days in September
Riville, France
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (1.7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in September / Average sunshine in September - Riville, France
Average daylight in September /
Average sunshine in September
Riville, France
  • Average daylight in September: 12h and 4min

The month with the longest days is June (Average daylight: 16h and 12min).
The month with the shortest days is December (Average daylight: 8h and 12min).

  • Average sunshine in September: 7h and 2min

The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is November (Average sunshine: 3h and 54min).

Average sunshine days in September - Riville, France
Average sunshine days in September
Riville, France
  • Average sunshine days in September: 13.1 days

The month with the most sunshine days is May (14.3 days).
The month with the least sunshine days is December (8.9 days).

Average UV index in September - Riville, France
Average UV index in September
Riville, France
  • Average UV index in September: 4

The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February and November (UV index 2).

Average cloud cover in September - Riville, France
Average cloud cover in September
Riville, France
  • Average cloud cover in September: 42

The months with the most cloud cover are November and December (Cloud cover 61).
The month with the least cloud cover is July (Cloud cover 39).

Average visibility in September - Riville, France
Average visibility in September
Riville, France
  • Average visibility in September: 10km

The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (10km).
The month with the lowest visibility is January (9km).

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