September weather forecastBorgarnes, Iceland
September
Weather in September
September marks the arrival of autumn in Borgarnes, with the weather turning increasingly cool. While the temperature drops moderately, the showers begin to increase, with an average rainfall of 40mm (1.57"). The lush green landscapes begin their transformation into a riot of warm autumnal hues. Despite the reduction in daylight hours, September offers pleasant weather suitable for exploring the fall colors and majestic landscapes around Borgarnes. Cooler temperatures make long outdoor excursions more comfortable as the city prepares for the incoming winter.Temperature
Borgarnes's progression into September involves a gentle drop in the average high-temperature, from a fresh 12.8°C (55°F) in August to a chilly 9.6°C (49.3°F). In Borgarnes, the nightly September temperatures experience a slight descent from daily highs to an average low of 6.2°C (43.2°F).Humidity
The months with the highest humidity are January, February and September, with an average relative humidity of 82%.Rainfall
In September, in Borgarnes, Iceland, the rain falls for 17.8 days. Throughout September, 40mm (1.57") of precipitation is accumulated. In Borgarnes, during the entire year, the rain falls for 166.2 days and collects up to 416mm (16.38") of precipitation.Snowfall
June through September are months without snowfall in Borgarnes, Iceland.Sea temperature
In Borgarnes, the average seawater temperature in September is 9.2°C (48.6°F).Note: You can swim in 9.2°C (48.6°F) below 10°C (50°F) with proper thermal wear; failing that, the cold shock and respiratory challenges are nearly certain. A short span at 13°C (55.4°F) without it is tough.
Daylight
The average length of the day in September is 13h and 2min.On the first day of the month, sunrise is at 06:10 and sunset at 20:44. On the last day of September, in Borgarnes, sunrise is at 07:35 and sunset at 18:58 GMT.
Sunshine
In September, the average sunshine in Borgarnes, Iceland, is 4.5h.UV index
In Borgarnes, the average daily maximum UV index in September is 2. A UV Index estimate of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for the average person.Note: An average maximum UV index of 2 in September leads to these recommendations:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Boost your sun resistance with garments that are densely woven yet spacious.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Borgarnes, Iceland
- Average high temperature in September: 9.6°C
The warmest month (with the highest average high temperature) is July (13.5°C).
The month with the lowest average high temperature is December (1.3°C).
- Average low temperature in September: 6.2°C
The month with the highest average low temperature is July (9.1°C).
The coldest month (with the lowest average low temperature) is December (-2.4°C).
Average pressure in September
Borgarnes, Iceland
- Average pressure in September: 1002.9mbar
The month with the highest atmospheric pressure is June (1013.8mbar).
The month with the lowest atmospheric pressure is January (996.6mbar).
Average wind speed in September
Borgarnes, Iceland
- Average wind speed in September: 20.4km/h
The windiest month (with the highest average wind speed) is February (24.9km/h).
The calmest months (with the lowest average wind speed) are June and July (14.9km/h).
Average humidity in September
Borgarnes, Iceland
- Average humidity in September: 82%
The months with the highest relative humidity are January, February and September (82%).
The month with the lowest relative humidity is May (75%).
Average rainfall in September
Borgarnes, Iceland
- Average rainfall in September: 40mm
The wettest month (with the highest rainfall) is January (47mm).
The driest months (with the least rainfall) are June and July (25mm).
Average rainfall days in September
Borgarnes, Iceland
- Average rainfall days in September: 17.8 days
The month with the highest number of rainy days is September (17.8 days).
The month with the least rainy days is December (9.7 days).
Average snowfall in September
Borgarnes, Iceland
- Average snowfall in September: 0mm
The month with the highest snowfall is March (100mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Borgarnes, Iceland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is March (9.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in September
Borgarnes, Iceland
- Average sea temperature in September: 9.2°C
The best month for swimming (with the highest average sea temperature) is August (10.8°C).
The coldest month (with the lowest average sea temperature) is March (4.1°C).
Average daylight in September /
Average sunshine in September
Borgarnes, Iceland
- Average daylight in September: 13h and 0min
The month with the longest days is June (Average daylight: 21h and 12min).
The month with the shortest days is December (Average daylight: 4h and 12min).
- Average sunshine in September: 4h and 30min
The month with the most sunshine is August (Average sunshine: 7h and 24min).
The month with the least sunshine is January (Average sunshine: 2h and 24min).
Average sunshine days in September
Borgarnes, Iceland
- Average sunshine days in September: 8.8 days
The month with the most sunshine days is December (14.1 days).
The month with the least sunshine days is September (8.8 days).
Average UV index in September
Borgarnes, Iceland
- Average UV index in September: 2
The month with the highest UV index is July (UV index 4).
The months with the lowest UV index are January, February and November (UV index 1).
Average cloud cover in September
Borgarnes, Iceland
- Average cloud cover in September: 65
The months with the most cloud cover are March and April (Cloud cover 68).
The months with the least cloud cover are August and December (Cloud cover 60).
Average visibility in September
Borgarnes, Iceland
- Average visibility in September: 9km
The month with the highest visibility is June (10km).
The months with the lowest visibility are January, February, March, April, May, July, August, September, October, November and December (9km).
