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 sea temperature 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
September in Sundsvall brings a slight decrease in the average high-temperature, shifting from an enjoyable 18.7°C (65.7°F) in August to a moderate 14°C (57.2°F). Sundsvall usually reports an average low-temperature of 7.3°C (45.1°F) during the month of September.Humidity
In September, the average relative humidity in Sundsvall is 79%.Rainfall
In Sundsvall, in September, during 11.7 rainfall days, 32mm (1.26") of precipitation is typically accumulated. In Sundsvall, Sweden, during the entire year, the rain falls for 117.2 days and collects up to 384mm (15.12") of precipitation.Snowfall
June through September are months without snowfall in Sundsvall, Sweden.Sea temperature
In September, the average sea temperature is 12°C (53.6°F).Note: Diving into 12°C (53.6°F) is practical below 10°C (50°F), given you're wearing protective swim gear; without it, expect a quick onset of cold shock and a struggle to breathe. Merely touching waters at 13°C (55.4°F) feels ice-cold.
Daylight
The average length of the day in September in Sundsvall is 12h and 57min.On the first day of the month, sunrise is at 05:40 and sunset at 20:00. On the last day of September, sunrise is at 06:56 and sunset at 18:24 CEST.
Sunshine
In September, the average sunshine is 7.6h.UV index
In September, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: In September, a regular UV index of 3 translates into these guidelines:
Ensure safety - Recommendations to avert sunburn are presented. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Sundsvall?
What is the average humidity in September in Sundsvall?
How many days does it rain in September in Sundsvall?
When it does not snow in Sundsvall?
Does it snow in Sundsvall in September?
How cold is the water in September in Sundsvall?
How many hours of daylight does Sundsvall have in September?
What time are sunrise and sunset in September in Sundsvall?
How many hours of sunshine does Sundsvall have in September?
How high is the UV index in September in Sundsvall?
Average temperature in September
Sundsvall, Sweden
- Average high temperature in September: 14°C
The warmest month (with the highest average high temperature) is July (20.3°C).
The month with the lowest average high temperature is January (-3°C).
- Average low temperature in September: 7.3°C
The month with the highest average low temperature is July (11.4°C).
The coldest month (with the lowest average low temperature) is February (-6.9°C).
Average pressure in September
Sundsvall, Sweden
- Average pressure in September: 1011.9mbar
The month with the highest atmospheric pressure is May (1014.3mbar).
The month with the lowest atmospheric pressure is December (1005.9mbar).
Average wind speed in September
Sundsvall, Sweden
- Average wind speed in September: 10.5km/h
The windiest month (with the highest average wind speed) is January (11.9km/h).
The calmest month (with the lowest average wind speed) is August (9.5km/h).
Average humidity in September
Sundsvall, Sweden
- Average humidity in September: 79%
The month with the highest relative humidity is February (91%).
The month with the lowest relative humidity is June (66%).
Average rainfall in September
Sundsvall, Sweden
- Average rainfall in September: 32mm
The wettest month (with the highest rainfall) is July (45mm).
The driest month (with the least rainfall) is April (19mm).
Average rainfall days in September
Sundsvall, Sweden
- Average rainfall days in September: 11.7 days
The month with the highest number of rainy days is July (14 days).
The month with the least rainy days is February (4.2 days).
Average snowfall in September
Sundsvall, Sweden
- Average snowfall in September: 0mm
The month with the highest snowfall is January (217mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Sundsvall, Sweden
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (15.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in September
Sundsvall, Sweden
- Average sea temperature in September: 12°C
The best month for swimming (with the highest average sea temperature) is August (15°C).
The coldest months (with the lowest average sea temperature) are January, February and March (1°C).
Average daylight in September /
Average sunshine in September
Sundsvall, Sweden
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 19h and 48min).
The month with the shortest days is December (Average daylight: 5h and 12min).
- Average sunshine in September: 7h and 4min
The month with the most sunshine is June (Average sunshine: 12h and 18min).
The month with the least sunshine is December (Average sunshine: 1h and 42min).
Average sunshine days in September
Sundsvall, Sweden
- Average sunshine days in September: 16.5 days
The month with the most sunshine days is October (17.6 days).
The month with the least sunshine days is February (12.5 days).
Average UV index in September
Sundsvall, 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, February, November and December (UV index 1).
Average cloud cover in September
Sundsvall, Sweden
- Average cloud cover in September: 49
The month with the most cloud cover is February (Cloud cover 64).
The month with the least cloud cover is July (Cloud cover 42).
Average visibility in September
Sundsvall, Sweden
- Average visibility in September: 8km
The months with the highest visibility are April, May, June, July, August and October (9km).
The months with the lowest visibility are January, February and March (7km).
Sundsvall, Sweden
Weather forecast for your location
2. Allow the app to use your location