September weather forecastVallanes, Iceland
September
Weather in September
The first month of the autumn, September, is also a frosty month in Vallanes, Iceland, with an average temperature ranging between min 4°C (39.2°F) and max 8.5°C (47.3°F).Temperature
September's arrival brings an average high-temperature of a chilly 8.5°C (47.3°F), slightly deviating from August's 11°C (51.8°F). Vallanes sustains an average of approximately a cold 4°C (39.2°F) during September nights, with little variation from daytime highs.Humidity
In September, the average relative humidity is 84%.Rainfall
In Vallanes, Iceland, in September, during 18.1 rainfall days, 56mm (2.2") of precipitation is typically accumulated. In Vallanes, during the entire year, the rain falls for 196.9 days and collects up to 966mm (38.03") of precipitation.Snowfall
January through July, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.8 snowfall days, it receives 2mm (0.08") of snow. Throughout the year, there are 115.7 snowfall days, and 2085mm (82.09") of snow is accumulated.Daylight
The average length of the day in September is 13h and 4min.On the first day of September, sunrise is at 05:38 and sunset at 20:17. On the last day of the month, sunrise is at 07:06 and sunset at 18:29 GMT.
Sunshine
In Vallanes, the average sunshine in September is 5.2h.UV index
In September, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for the ordinary person.Note: In September, the average maximum UV index of 2 translates into the following recommendations:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Vallanes, Iceland
- Average high temperature in September: 8.5°C
The warmest month (with the highest average high temperature) is July (11.8°C).
The month with the lowest average high temperature is December (-1.2°C).
- Average low temperature in September: 4°C
The month with the highest average low temperature is July (6.8°C).
The coldest month (with the lowest average low temperature) is December (-6.2°C).
Average pressure in September
Vallanes, Iceland
- Average pressure in September: 1003.8mbar
The month with the highest atmospheric pressure is June (1014.4mbar).
The month with the lowest atmospheric pressure is January (998.7mbar).
Average wind speed in September
Vallanes, Iceland
- Average wind speed in September: 14.6km/h
The windiest month (with the highest average wind speed) is December (18.7km/h).
The calmest month (with the lowest average wind speed) is July (11.9km/h).
Average humidity in September
Vallanes, Iceland
- Average humidity in September: 84%
The months with the highest relative humidity are January, February, November and December (89%).
The month with the lowest relative humidity is June (77%).
Average rainfall in September
Vallanes, Iceland
- Average rainfall in September: 56mm
The wettest month (with the highest rainfall) is December (145mm).
The driest month (with the least rainfall) is June (38mm).
Average rainfall days in September
Vallanes, Iceland
- Average rainfall days in September: 18.1 days
The month with the highest number of rainy days is July (19.5 days).
The month with the least rainy days is March (12.8 days).
Average snowfall in September
Vallanes, Iceland
- Average snowfall in September: 2mm
The month with the highest snowfall is March (430mm).
The month with the least snowfall is August (0mm).
Average snowfall days in September
Vallanes, Iceland
- Average snowfall days in September: 0.8 days
The month with the highest number of snowfall days is March (19.5 days).
The month with the least snowfall days is August (0 days).
Average daylight in September /
Average sunshine in September
Vallanes, Iceland
- Average daylight in September: 13h and 6min
The month with the longest days is June (Average daylight: 21h and 54min).
The month with the shortest days is December (Average daylight: 3h and 48min).
- Average sunshine in September: 5h and 12min
The month with the most sunshine is May (Average sunshine: 7h and 12min).
The month with the least sunshine is December (Average sunshine: 1h and 24min).
Average sunshine days in September
Vallanes, Iceland
- Average sunshine days in September: 8.6 days
The month with the most sunshine days is August (10.3 days).
The month with the least sunshine days is February (3.5 days).
Average UV index in September
Vallanes, Iceland
- Average UV index in September: 2
The month with the highest UV index is June (UV index 3).
The months with the lowest UV index are January, February, March and December (UV index 1).
Average cloud cover in September
Vallanes, Iceland
- Average cloud cover in September: 63
The months with the most cloud cover are February and November (Cloud cover 70).
The month with the least cloud cover is June (Cloud cover 61).
Average visibility in September
Vallanes, Iceland
- Average visibility in September: 9km
The months with the highest visibility are June, July and September (9km).
The months with the lowest visibility are February, March and December (7km).
