Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
Karlby in September undergoes a slight reduction in the average high-temperature, shifting from August's 18.1°C (64.6°F) to a still refreshing 14.9°C (58.8°F). September nights in Karlby register a minor temperature decline, steadying at a still refreshing 13.2°C (55.8°F).Humidity
August through October, with an average relative humidity of 78%, are the least humid months in Karlby.Rainfall
The month with the most rainfall in Karlby is September, when the rain falls for 14.2 days and typically aggregates up to 38mm (1.5") of precipitation.Snowfall
In Karlby, Finland, snow does not fall in June through September.Daylight
In Karlby, the average length of the day in September is 12h and 52min.On the first day of September, sunrise is at 06:32 and sunset at 20:39. On the last day of the month, sunrise is at 07:40 and sunset at 19:11 EEST.
Sunshine
The average sunshine in September is 8.1h.UV index
In Karlby, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the average person.Note: In September, a regular UV index of 4 translates into these guidelines:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Enhance your sun protection with tightly woven, yet airy clothing.
Frequently asked questions
What are September temperatures in Karlby?
What are the least humid months in Karlby?
What is the average humidity in September in Karlby?
What is the rainiest month in Karlby?
How many days does it rain in September in Karlby?
When it does not snow in Karlby?
Does it snow in Karlby in September?
What is the average length of the day in September in Karlby?
What time are sunrise and sunset in September in Karlby?
How many hours of sunshine does Karlby have in September?
What is the UV index reading in September in Karlby?
Average temperature in September
Karlby, Finland
- Average high temperature in September: 14.9°C
The warmest month (with the highest average high temperature) is August (18.1°C).
The month with the lowest average high temperature is February (0.3°C).
- Average low temperature in September: 13.2°C
The month with the highest average low temperature is August (16.3°C).
The coldest month (with the lowest average low temperature) is February (-1.7°C).
Average pressure in September
Karlby, Finland
- Average pressure in September: 1013.3mbar
The month with the highest atmospheric pressure is May (1015mbar).
The month with the lowest atmospheric pressure is December (1007.8mbar).
Average wind speed in September
Karlby, Finland
- Average wind speed in September: 26.4km/h
The windiest month (with the highest average wind speed) is December (34.1km/h).
The calmest month (with the lowest average wind speed) is July (21.2km/h).
Average humidity in September
Karlby, Finland
- Average humidity in September: 78%
The months with the highest relative humidity are February and March (84%).
The months with the lowest relative humidity are August, September and October (78%).
Average rainfall in September
Karlby, Finland
- Average rainfall in September: 38mm
The wettest month (with the highest rainfall) is September (38mm).
The driest month (with the least rainfall) is April (12mm).
Average rainfall days in September
Karlby, Finland
- Average rainfall days in September: 14.2 days
The month with the highest number of rainy days is August (14.8 days).
The month with the least rainy days is February (5.8 days).
Average snowfall in September
Karlby, Finland
- Average snowfall in September: 0mm
The month with the highest snowfall is January (41mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Karlby, Finland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Karlby, Finland
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 18h and 42min).
The month with the shortest days is December (Average daylight: 6h and 6min).
- Average sunshine in September: 8h and 1min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 2h and 0min).
Average sunshine days in September
Karlby, Finland
- Average sunshine days in September: 12.9 days
The month with the most sunshine days is May (19.3 days).
The month with the least sunshine days is December (8.9 days).
Average UV index in September
Karlby, Finland
- Average UV index in September: 4
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March and December (UV index 1).
Average cloud cover in September
Karlby, Finland
- Average cloud cover in September: 41
The months with the most cloud cover are January and December (Cloud cover 71).
The months with the least cloud cover are July and August (Cloud cover 33).
Average visibility in September
Karlby, Finland
- Average visibility in September: 10km
The months with the highest visibility are April, May, June, July, August, September and October (10km).
The months with the lowest visibility are January, February, March, November and December (9km).
Karlby, Finland
Weather forecast for your location
2. Allow the app to use your location
