September weather forecast
Celje, Slovenia

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Weather in September

September in Celje embodies the shift from summer to fall, with its changing colors and cooling temperatures. September experiences the lowest wind speeds of the year, roughly around 5.8km/h (3.6mph), which creates a calm and tranquil environment. The gradual decrease in daylight hours signifies the onset of shorter days. Though the weather remains moderately warm, the evenings are noticeably cooler, introducing the beginnings of fall. The city’s lush greenery starts to transform into brilliant shades of gold and red as September proceeds, amplifying the beauty of Celje.

Temperature

Celje in September undergoes a mild reduction in the average high-temperature, shifting from August's warm 25.2°C (77.4°F) to a refreshing 19.3°C (66.7°F). An average low-temperature of 9.4°C (48.9°F) is recorded in the month of September.

Humidity

In Celje, the average relative humidity in September is 82%.

Rainfall

In Celje, during September, the rain falls for 15.1 days and regularly aggregates up to 77mm (3.03") of precipitation. In Celje, during the entire year, the rain falls for 179.3 days and collects up to 854mm (33.62") of precipitation.

Snowfall

May through September are months without snowfall.

Daylight

The average length of the day in September is 12h and 32min.
On the first day of September, sunrise is at 06:20 and sunset at 19:37. On the last day of the month, sunrise is at 06:56 and sunset at 18:40 CEST.

Sunshine

In Celje, the average sunshine in September is 8.9h.

UV index

The average daily maximum UV index in September in Celje is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: A maximum high UV index of 4 in September translates into the following recommendations:
Exercise caution. Those with pale skin may experience burns in less than half an hour. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.

Frequently asked questions

What are the temperatures in September?

In September, in Celje, the average high-temperature is 19.3°C (66.7°F), and the average low-temperature is 9.4°C (48.9°F).

What is the average humidity in September?

The average relative humidity in September is 82%.

How much does it rain in September?

In Celje, in September, it is raining for 15.1 days, with typically 77mm (3.03") of accumulated precipitation.

When it does not snow?

May through September are months without snowfall.

Does it snow in September?

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

How many hours of daylight does Celje have in September?

In September, the average day length is 12h and 32min.

What time are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 06:20 and sunset at 19:37. On the last day of the month, sunrise is at 06:56 and sunset at 18:40 CEST.

How long on average sun shines in September?

In September, the average sunshine duration is 8.9h.

What is the UV index reading in September?

In Celje, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from exposure to the Sun's 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 visibility

Average temperature in September
Celje, Slovenia

Average temperature in September - Celje, Slovenia
  • Average high temperature in September: 19.3°C

The warmest month (with the highest average high temperature) is August (25.2°C).
The month with the lowest average high temperature is January (2.6°C).

  • Average low temperature in September: 9.4°C

The month with the highest average low temperature is August (13°C).
The coldest month (with the lowest average low temperature) is January (-3°C).

Average pressure in September
Celje, Slovenia

Average pressure in September - Celje, Slovenia
  • Average pressure in September: 1017.8mbar

The month with the highest atmospheric pressure is December (1020.4mbar).
The months with the lowest atmospheric pressure are May and June (1015mbar).

Average wind speed in September
Celje, Slovenia

Average wind speed in September - Celje, Slovenia
  • Average wind speed in September: 5.8km/h

The windiest month (with the highest average wind speed) is March (8.1km/h).
The calmest month (with the lowest average wind speed) is August (5.5km/h).

Average humidity in September
Celje, Slovenia

Average humidity in September - Celje, Slovenia
  • Average humidity in September: 82%

The month with the highest relative humidity is November (87%).
The month with the lowest relative humidity is April (75%).

Average rainfall in September
Celje, Slovenia

Average rainfall in September - Celje, Slovenia
  • Average rainfall in September: 77mm

The wettest month (with the highest rainfall) is May (120mm).
The driest month (with the least rainfall) is January (33mm).

Average rainfall days in September
Celje, Slovenia

Average rainfall days in September - Celje, Slovenia
  • Average rainfall days in September: 15.1 days

The month with the highest number of rainy days is May (22.9 days).
The month with the least rainy days is January (8.6 days).

Average snowfall in September
Celje, Slovenia

Average snowfall in September - Celje, Slovenia
  • Average snowfall in September: 0mm

The month with the highest snowfall is February (185mm).
The months with the least snowfall are May, June, July, August and September (0mm).

Average snowfall days in September
Celje, Slovenia

Average snowfall days in September - Celje, Slovenia
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (8.6 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Celje, Slovenia

Average daylight in September / Average sunshine in September - Celje, Slovenia
  • Average daylight in September: 12h and 3min

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 42min).

  • Average sunshine in September: 8h and 5min

The months with the most sunshine are July and August (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).

Average sunshine days in September
Celje, Slovenia

Average sunshine days in September - Celje, Slovenia
  • Average sunshine days in September: 12.4 days

The month with the most sunshine days is December (16.9 days).
The month with the least sunshine days is May (5.9 days).

Average UV index in September
Celje, Slovenia

Average UV index in September - Celje, Slovenia
  • 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 and November (UV index 1).

Average cloud cover in September
Celje, Slovenia

Average cloud cover in September - Celje, Slovenia
  • Average cloud cover in September: 40

The month with the most cloud cover is February (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 27).

Average visibility in September
Celje, Slovenia

Average visibility in September - Celje, Slovenia
  • Average visibility in September: 8km

The months with the highest visibility are April, June, July and August (9km).
The months with the lowest visibility are January, February, October and November (7km).

Celje, Slovenia

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