September weather forecastHorten, Norway
September
Weather in September
Horten begins to experience the onset of Autumn in September. With an average high of 15.3°C (59.5°F), the temperature drop is evident. The slight chill in the air, the shorter days and the changing autumnal foliage suggest of winters fast approaching. Moreover, the city sees another increase in rainfall, fostering the growth of late blooming plants.Temperature
In September, the meteorological conditions change slightly, with the average high-temperature moving from a refreshing 18.6°C (65.5°F) in August to a mild 15.3°C (59.5°F). September nights reflect a consistent temperature dip to a fresh 10.6°C (51.1°F), a slight descent from daytime peaks.Humidity
In September, the average relative humidity in Horten is 78%.Rainfall
In Horten, during September, the rain falls for 12.8 days and regularly aggregates up to 64mm (2.52") of precipitation. In Horten, during the entire year, the rain falls for 146.5 days and collects up to 650mm (25.59") of precipitation.Snowfall
May through September are months without snowfall in Horten.Sea temperature
In Horten, Norway, the average seawater temperature in September is 15.8°C (60.4°F).Note: Swimming in 15.8°C (60.4°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).
Daylight
In Horten, the average length of the day in September is 12h and 50min.On the first day of the month, sunrise is at 06:15 and sunset at 20:19. On the last day of September, in Horten, sunrise is at 07:22 and sunset at 18:53 CEST.
Sunshine
The average sunshine in September in Horten is 8.3h.UV index
In Horten, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: The daily high UV index of 4 during September translates into the following recommendations:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Horten, Norway
- Average high temperature in September: 15.3°C
The warmest month (with the highest average high temperature) is July (19.2°C).
The month with the lowest average high temperature is February (0.1°C).
- Average low temperature in September: 10.6°C
The month with the highest average low temperature is July (13.8°C).
The coldest month (with the lowest average low temperature) is February (-3.3°C).
Average pressure in September
Horten, Norway
- Average pressure in September: 1012.7mbar
The month with the highest atmospheric pressure is April (1014.4mbar).
The month with the lowest atmospheric pressure is December (1008mbar).
Average wind speed in September
Horten, Norway
- Average wind speed in September: 16.3km/h
The windiest months (with the highest average wind speed) are November and December (19.2km/h).
The calmest month (with the lowest average wind speed) is July (13.6km/h).
Average humidity in September
Horten, Norway
- Average humidity in September: 78%
The month with the highest relative humidity is February (85%).
The months with the lowest relative humidity are April and May (72%).
Average rainfall in September
Horten, Norway
- Average rainfall in September: 64mm
The wettest month (with the highest rainfall) is November (76mm).
The driest month (with the least rainfall) is April (26mm).
Average rainfall days in September
Horten, Norway
- Average rainfall days in September: 12.8 days
The month with the highest number of rainy days is August (16.3 days).
The month with the least rainy days is February (7.3 days).
Average snowfall in September
Horten, Norway
- Average snowfall in September: 0mm
The month with the highest snowfall is January (131mm).
The months with the least snowfall are May, June, July, August and September (0mm).
Average snowfall days in September
Horten, Norway
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in September
Horten, Norway
- Average sea temperature in September: 15.8°C
The best month for swimming (with the highest average sea temperature) is August (18.4°C).
The coldest month (with the lowest average sea temperature) is March (2.8°C).
Average daylight in September /
Average sunshine in September
Horten, Norway
- 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 18min
The month with the most sunshine is June (Average sunshine: 11h and 36min).
The month with the least sunshine is December (Average sunshine: 3h and 24min).
Average sunshine days in September
Horten, Norway
- Average sunshine days in September: 15 days
The month with the most sunshine days is April (18.3 days).
The month with the least sunshine days is February (11.8 days).
Average UV index in September
Horten, Norway
- 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, October, November and December (UV index 2).
Average cloud cover in September
Horten, Norway
- Average cloud cover in September: 42
The month with the most cloud cover is February (Cloud cover 60).
The months with the least cloud cover are June, July and August (Cloud cover 36).
Average visibility in September
Horten, Norway
- Average visibility in September: 10km
The months with the highest visibility are May, June, July, August and September (10km).
The month with the lowest visibility is February (8km).
