September weather forecastArendal, Norway
September
Weather in September
September signifies the arrival of fall in Arendal. Locals notice a drop in average temperatures to 15.2°C (59.4°F). As the leaves begin to change, the landscapes of the city display a riot of colors. With shorter days and longer nights, September ushers in the start of the harvest season. The cooling weather and vibrant foliage present an entirely new facet of Arendal's beauty.Temperature
September indicates a minor shift in the average high-temperature, from August's comfortable 18.3°C (64.9°F) to a mild 15.2°C (59.4°F). Recording a slight drop from the daily maximum, Arendal notes an average low temperature of 11°C (51.8°F) in the month of September.Humidity
In Arendal, Norway, the average relative humidity in September is 78%.Rainfall
In Arendal, in September, it is raining for 12.6 days, with typically 65mm (2.56") of accumulated precipitation. Throughout the year, there are 137.7 rainfall days, and 744mm (29.29") of precipitation is accumulated.Snowfall
May through September are months without snowfall in Arendal, Norway.Sea temperature
In Arendal, the average seawater temperature in September is 15.9°C (60.6°F).Note: Swimming is not enjoyable for most people in water that is 15.9°C (60.6°F). As the temperature descends from 21°C (69.8°F) to 15°C (59°F), breathing control becomes harder.
Daylight
The average length of the day in September in Arendal is 12h and 49min.On the first day of the month, sunrise is at 06:25 and sunset at 20:24. On the last day of September, sunrise is at 07:28 and sunset at 19:01 CEST.
Sunshine
In Arendal, Norway, the average sunshine in September is 7.8h.UV index
The average daily maximum UV index in September in Arendal is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: The UV index of 4 in September translates into these instructions:
Adopt protective measures - Suggestions to resist sunburn are offered. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Arendal, Norway
- Average high temperature in September: 15.2°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 (1.3°C).
- Average low temperature in September: 11°C
The month with the highest average low temperature is July (13.6°C).
The coldest month (with the lowest average low temperature) is February (-1.5°C).
Average pressure in September
Arendal, Norway
- Average pressure in September: 1012.9mbar
The month with the highest atmospheric pressure is April (1014.6mbar).
The month with the lowest atmospheric pressure is December (1007.8mbar).
Average wind speed in September
Arendal, Norway
- Average wind speed in September: 18.3km/h
The windiest month (with the highest average wind speed) is November (21.1km/h).
The calmest month (with the lowest average wind speed) is June (15.5km/h).
Average humidity in September
Arendal, Norway
- Average humidity in September: 78%
The month with the highest relative humidity is February (86%).
The months with the lowest relative humidity are May and June (70%).
Average rainfall in September
Arendal, Norway
- Average rainfall in September: 65mm
The wettest month (with the highest rainfall) is November (88mm).
The driest month (with the least rainfall) is April (29mm).
Average rainfall days in September
Arendal, Norway
- Average rainfall days in September: 12.6 days
The month with the highest number of rainy days is November (15.5 days).
The month with the least rainy days is February (8 days).
Average snowfall in September
Arendal, Norway
- Average snowfall in September: 0mm
The month with the highest snowfall is January (130mm).
The months with the least snowfall are May, June, July, August and September (0mm).
Average snowfall days in September
Arendal, Norway
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average sea temperature in September
Arendal, Norway
- Average sea temperature in September: 15.9°C
The best month for swimming (with the highest average sea temperature) is August (18.2°C).
The coldest month (with the lowest average sea temperature) is March (3.4°C).
Average daylight in September /
Average sunshine in September
Arendal, Norway
- Average daylight in September: 12h and 48min
The month with the longest days is June (Average daylight: 18h and 12min).
The month with the shortest days is December (Average daylight: 6h and 30min).
- Average sunshine in September: 7h and 48min
The month with the most sunshine is June (Average sunshine: 11h and 24min).
The months with the least sunshine are January and December (Average sunshine: 3h and 12min).
Average sunshine days in September
Arendal, Norway
- Average sunshine days in September: 14.9 days
The month with the most sunshine days is April (19 days).
The month with the least sunshine days is November (10.8 days).
Average UV index in September
Arendal, Norway
- Average UV index in September: 4
The month with the highest UV index is July (UV index 5).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Arendal, Norway
- Average cloud cover in September: 44
The month with the most cloud cover is November (Cloud cover 63).
The month with the least cloud cover is July (Cloud cover 35).
Average visibility in September
Arendal, Norway
- Average visibility in September: 10km
The months with the highest visibility are April, May, June, July, August and September (10km).
The months with the lowest visibility are January, February, March, October, November and December (9km).
