September weather forecast
Altier, France

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Weather in September

The first month of the autumn, September, is still a comfortable month in Altier, France, with an average temperature fluctuating between 7.4°C (45.3°F) and 18.9°C (66°F).

Temperature

Altier's September weather shows a modest shift in high-temperatures, falling from August's moderately hot 23.8°C (74.8°F) to an enjoyable 18.9°C (66°F). Throughout September nights, Altier registers an average low-temperature of 7.4°C (45.3°F).

Humidity

In September, the average relative humidity is 76%.

Rainfall

In Altier, during September, the rain falls for 10.4 days and regularly aggregates up to 36mm (1.42") of precipitation. In Altier, during the entire year, the rain falls for 138.7 days and collects up to 637mm (25.08") of precipitation.

Snowfall

January through May, September through December are months with snowfall. September is the first month it typically snows in Altier. Throughout September, in the average 0.2 snowfall days, it receives 3mm (0.12") of snow. In Altier, during the entire year, snow falls for 53 days and aggregates up to 938mm (36.93") of snow.

Daylight

In Altier, the average length of the day in September is 12h and 31min.
On the first day of September, sunrise is at 07:07 and sunset at 20:20. On the last day of the month, sunrise is at 07:41 and sunset at 19:26 CEST.

Sunshine

In September, the average sunshine is 8.2h.

UV index

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the average person.
Note: In September, the average maximum UV index of 4 translates into the following recommendations:
Prioritize safety - Recommendations to avert sunburn are shared. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
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Frequently asked questions

What are the temperatures in Altier in September?

During September, Altier experiences an average high-temperature of 18.9°C (66°F) and a low-temperature of 7.4°C (45.3°F).

What is the average humidity in September in Altier?

In September, the average relative humidity is 76%.

How much does it rain in Altier in September?

In Altier, during September, the rain falls for 10.4 days and regularly aggregates up to 36mm (1.42") of precipitation.

When does it start to snow in Altier?

September is the first month it typically snows in Altier, France. Throughout September, in the average 0.2 snowfall days, it receives 3mm (0.12") of snow.

How many hours of daylight does Altier have in September?

The average day length in September in Altier, France, is 12h and 31min.

What time are sunrise and sunset in September in Altier?

On the first day of September in Altier, sunrise is at 07:07 and sunset at 20:20. On the last day of the month, sunrise is at 07:41 and sunset at 19:26 CEST.

How many hours of sunshine does Altier have in September?

The average sunshine duration in September in Altier, France, is 8.2h.

What is the UV index reading in September in Altier?

The average daily maximum UV index in September in Altier, France, is 4. A UV Index estimate of 3 to 5 represents a moderate health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Altier, France

Average temperature in September - Altier, France
  • Average high temperature in September: 18.9°C

The warmest month (with the highest average high temperature) is August (23.8°C).
The month with the lowest average high temperature is January (3.4°C).

  • Average low temperature in September: 7.4°C

The month with the highest average low temperature is July (10.8°C).
The coldest month (with the lowest average low temperature) is February (-3.3°C).

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Average pressure in September
Altier, France

Average pressure in September - Altier, France
  • Average pressure in September: 1018.1mbar

The month with the highest atmospheric pressure is December (1021.3mbar).
The month with the lowest atmospheric pressure is April (1015.3mbar).

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Average wind speed in September
Altier, France

Average wind speed in September - Altier, France
  • Average wind speed in September: 9km/h

The windiest month (with the highest average wind speed) is February (12.5km/h).
The calmest month (with the lowest average wind speed) is August (8.8km/h).

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Average humidity in September
Altier, France

Average humidity in September - Altier, France
  • Average humidity in September: 76%

The month with the highest relative humidity is November (89%).
The month with the lowest relative humidity is August (69%).

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Average rainfall in September
Altier, France

Average rainfall in September - Altier, France
  • Average rainfall in September: 36mm

The wettest month (with the highest rainfall) is November (103mm).
The driest month (with the least rainfall) is August (31mm).

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Average rainfall days in September
Altier, France

Average rainfall days in September - Altier, France
  • Average rainfall days in September: 10.4 days

The month with the highest number of rainy days is May (15.9 days).
The month with the least rainy days is February (7.1 days).

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Average snowfall in September
Altier, France

Average snowfall in September - Altier, France
  • Average snowfall in September: 3mm

The month with the highest snowfall is January (213mm).
The months with the least snowfall are June, July and August (0mm).

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Average snowfall days in September
Altier, France

Average snowfall days in September - Altier, France
  • Average snowfall days in September: 0.2 days

The month with the highest number of snowfall days is January (12.6 days).
The months with the least snowfall days are June, July and August (0 days).

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Average daylight in September /
Average sunshine in September
Altier, France

Average daylight in September / Average sunshine in September - Altier, France
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).

  • Average sunshine in September: 8h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is November (Average sunshine: 4h and 0min).

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Average sunshine days in September
Altier, France

Average sunshine days in September - Altier, France
  • Average sunshine days in September: 18.4 days

The month with the most sunshine days is September (18.4 days).
The month with the least sunshine days is November (11.4 days).

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Average UV index in September
Altier, France

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

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

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Average cloud cover in September
Altier, France

Average cloud cover in September - Altier, France
  • Average cloud cover in September: 40

The month with the most cloud cover is November (Cloud cover 66).
The month with the least cloud cover is August (Cloud cover 28).

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Average visibility in September
Altier, France

Average visibility in September - Altier, France
  • Average visibility in September: 8km

The month with the highest visibility is August (9km).
The months with the lowest visibility are January, October, November and December (7km).

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Altier, France

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