September weather forecastRunnaby, Sweden
September
Weather in September
September, the first month of the autumn in Runnaby, is still a refreshing month, with an average temperature varying between 8.6°C (47.5°F) and 15.8°C (60.4°F).Temperature
The shift from August to September coincides with a small decrease in the average high-temperature, down to a refreshing 15.8°C (60.4°F) from an agreeable 20.4°C (68.7°F). Throughout the month of September, Runnaby expects an average low of 8.6°C (47.5°F).Humidity
The average relative humidity in September in Runnaby is 80%.Rainfall
In September, in Runnaby, the rain falls for 9 days. Throughout September, 13mm (0.51") of precipitation is accumulated. Throughout the year, in Runnaby, Sweden, there are 104.5 rainfall days, and 149mm (5.87") of precipitation is accumulated.Snowfall
June through September are months without snowfall in Runnaby.Daylight
In Runnaby, Sweden, the average length of the day in September is 12h and 50min.On the first day of the month, sunrise is at 05:57 and sunset at 20:01. On the last day of September, sunrise is at 07:03 and sunset at 18:35 CEST.
Sunshine
In Runnaby, the average sunshine in September is 7.6h.UV index
In Runnaby, Sweden, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: In September, an average UV index of 3 transforms into the following instructions:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Runnaby, Sweden
- Average high temperature in September: 15.8°C
The warmest month (with the highest average high temperature) is July (21.8°C).
The month with the lowest average high temperature is January (-1.1°C).
- Average low temperature in September: 8.6°C
The month with the highest average low temperature is July (12.3°C).
The coldest months (with the lowest average low temperature) are January and February (-4.5°C).
Average pressure in September
Runnaby, Sweden
- Average pressure in September: 1013.4mbar
The month with the highest atmospheric pressure is May (1014.5mbar).
The month with the lowest atmospheric pressure is December (1008.1mbar).
Average wind speed in September
Runnaby, Sweden
- Average wind speed in September: 11.8km/h
The windiest month (with the highest average wind speed) is December (12.8km/h).
The calmest month (with the lowest average wind speed) is August (10.6km/h).
Average humidity in September
Runnaby, Sweden
- Average humidity in September: 80%
The months with the highest relative humidity are January and February (91%).
The month with the lowest relative humidity is May (69%).
Average rainfall in September
Runnaby, Sweden
- Average rainfall in September: 13mm
The wettest month (with the highest rainfall) is July (20mm).
The driest month (with the least rainfall) is April (6mm).
Average rainfall days in September
Runnaby, Sweden
- Average rainfall days in September: 9 days
The month with the highest number of rainy days is July (13.6 days).
The month with the least rainy days is February (4.5 days).
Average snowfall in September
Runnaby, Sweden
- Average snowfall in September: 0mm
The month with the highest snowfall is March (39mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Runnaby, Sweden
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (11.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Runnaby, 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 18min).
- Average sunshine in September: 7h and 36min
The month with the most sunshine is June (Average sunshine: 12h and 12min).
The month with the least sunshine is February (Average sunshine: 2h and 54min).
Average sunshine days in September
Runnaby, Sweden
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is March (19 days).
The months with the least sunshine days are February and December (15.4 days).
Average UV index in September
Runnaby, Sweden
- Average UV index in September: 3
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January and February (UV index 1).
Average cloud cover in September
Runnaby, Sweden
- Average cloud cover in September: 49
The month with the most cloud cover is February (Cloud cover 71).
The month with the least cloud cover is June (Cloud cover 43).
Average visibility in September
Runnaby, Sweden
- Average visibility in September: 8km
The months with the highest visibility are April, May, June, July and August (9km).
The months with the lowest visibility are January and February (7km).
