September weather forecastAlster, Sweden

September

Weather in September

The first month of the autumn, September, is still a refreshing month in Alster, Sweden, with an average temperature varying between 10°C (50°F) and 15.6°C (60.1°F).

Temperature

As September arrives, Alster's weather displays a minor decrease in high-temperatures, transitioning from August's comfortable 19.8°C (67.6°F) to a still refreshing 15.6°C (60.1°F). In September, the recorded average low-temperature is a fresh 10°C (50°F).

Humidity

In September, the average relative humidity is 78%.

Rainfall

In Alster, in September, it is raining for 13.9 days, with typically 40mm (1.57") of accumulated precipitation. In Alster, during the entire year, the rain falls for 151 days and collects up to 477mm (18.78") of precipitation.

Snowfall

In Alster, snow does not fall in June through September.

Daylight

In Alster, the average length of the day in September is 12h and 50min.
On the first day of the month, sunrise is at 06:03 and sunset at 20:07. On the last day of September, sunrise is at 07:09 and sunset at 18:41 CEST.

Sunshine

In September, the average sunshine is 8h.

UV index

The average daily maximum UV index in September in Alster, Sweden, is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum UV index of 3 during September leads to these instructions:
Take measures. Individuals with light skin might experience burns in under 30 minutes. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Opt for tightly woven and loose clothing to enhance protection from the Sun.

Updated: Jul 26, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

The high-temperature, in September, in Alster, is 15.6°C (60.1°F), while the low-temperature averages to 10°C (50°F).

The average relative humidity in September is 78%.

In Alster, during September, the rain falls for 13.9 days and regularly aggregates up to 40mm (1.57") of precipitation.

In Alster, snow does not fall in June through September.

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

In Alster, Sweden, the average day length in September is 12h and 50min.

On the first day of September, sunrise is at 06:03 and sunset at 20:07. On the last day of the month, sunrise is at 07:09 and sunset at 18:41 CEST.

In Alster, the average sunshine duration in September is 8h.

In Alster, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a medium health risk from exposure to the Sun's UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

19.8°C

15.6°C

9.6°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

14.2km/h

15.6km/h

17.2km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

12.4

13.9

12.7

Average UV index

Average cloud cover

Average visibility

Average temperature in September
Alster, Sweden

Average high temperature in September: 15.6°C

The warmest month (with the highest average high temperature) is July (20.8°C).
The month with the lowest average high temperature is January (-0.3°C).

Average low temperature in September: 10°C

The month with the highest average low temperature is July (13.3°C).
The coldest month (with the lowest average low temperature) is February (-3.8°C).

Average pressure in September
Alster, Sweden

Average pressure in September: 1013.2mbar

The months with the highest atmospheric pressure are April and May (1014.2mbar).
The month with the lowest atmospheric pressure is December (1008mbar).

Average wind speed in September
Alster, Sweden

Average wind speed in September: 14.9km/h

The windiest month (with the highest average wind speed) is December (16.7km/h).
The calmest month (with the lowest average wind speed) is July (12.7km/h).

Average humidity in September
Alster, Sweden

Average humidity in September: 78%

The month with the highest relative humidity is February (88%).
The month with the lowest relative humidity is May (69%).

Average rainfall in September
Alster, Sweden

Average rainfall in September: 40mm

The wettest month (with the highest rainfall) is July (57mm).
The driest month (with the least rainfall) is April (16mm).

Average rainfall days in September
Alster, Sweden

Average rainfall days in September: 13.9 days

The month with the highest number of rainy days is July (17.4 days).
The months with the least rainy days are January and February (7.1 days).

Average snowfall in September
Alster, Sweden

Average snowfall in September: 0mm

The month with the highest snowfall is January (108mm).
The months with the least snowfall are June, July, August and September (0mm).

Average snowfall days in September
Alster, Sweden

Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (12 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Alster, Sweden

Average daylight in September: 12h and 48min

The month with the longest days is June (Average daylight: 18h and 30min).
The month with the shortest days is December (Average daylight: 6h and 12min).

Average sunshine in September: 8h and 0min

The month with the most sunshine is June (Average sunshine: 12h and 42min).
The month with the least sunshine is December (Average sunshine: 3h and 12min).