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
September
Weather in September
Temperature
As September unfolds in Úlfsá, the average high-temperature reaches a still chilly 6.6°C (43.9°F), hinting at a slight fluctuation from the previous month. Throughout September, a modest shift from daytime highs is anticipated, with an average low-temperature of 3.9°C (39°F).Humidity
In September, the average relative humidity is 87%.Rainfall
In Úlfsá, during September, the rain falls for 17.6 days and regularly aggregates up to 55mm (2.17") of precipitation. Throughout the year, in Úlfsá, there are 124.6 rainfall days, and 664mm (26.14") of precipitation is accumulated.Snowfall
January through June, August through December are months with snowfall. In September, it is snowing for 1.5 days. Throughout September, 15mm (0.59") of snow is accumulated. In Úlfsá, during the entire year, snow falls for 96.2 days and aggregates up to 1214mm (47.8") of snow.Sea temperature
In Úlfsá, the average seawater temperature in September is 6°C (42.8°F).Note: Unprotected swimming in 6°C (42.8°F) is dangerous due to potential cold shock. Especially when temperatures go below 10°C (50°F), leading to hyperventilation.
Daylight
In Úlfsá, the average length of the day in September is 13h and 6min.On the first day of September, sunrise is at 06:10 and sunset at 20:54. On the last day of the month, sunrise is at 07:42 and sunset at 19:02 GMT.
Sunshine
The average sunshine in September is 3.5h.UV index
In September, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum daily UV index of 2 in September interprets into the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it cold during September?
What is the average humidity in September?
How many days does it rain in September?
How many days does it snow in September?
How cold is the water in September?
How many hours of daylight does Úlfsá have in September?
When are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September in Úlfsá?
Average temperature in September
Úlfsá, Iceland
- Average high temperature in September: 6.6°C
The warmest month (with the highest average high temperature) is July (9.5°C).
The month with the lowest average high temperature is March (-1°C).
- Average low temperature in September: 3.9°C
The month with the highest average low temperature is July (6.3°C).
The coldest month (with the lowest average low temperature) is December (-4.3°C).
Average pressure in September
Úlfsá, Iceland
- Average pressure in September: 1003.4mbar
The month with the highest atmospheric pressure is June (1014.7mbar).
The month with the lowest atmospheric pressure is January (997.3mbar).
Average wind speed in September
Úlfsá, Iceland
- Average wind speed in September: 17.4km/h
The windiest months (with the highest average wind speed) are February and December (25.2km/h).
The calmest month (with the lowest average wind speed) is June (13.4km/h).
Average humidity in September
Úlfsá, Iceland
- Average humidity in September: 87%
The months with the highest relative humidity are January, February, October and December (88%).
The month with the lowest relative humidity is June (81%).
Average rainfall in September
Úlfsá, Iceland
- Average rainfall in September: 55mm
The wettest month (with the highest rainfall) is January (88mm).
The driest month (with the least rainfall) is June (20mm).
Average rainfall days in September
Úlfsá, Iceland
- Average rainfall days in September: 17.6 days
The month with the highest number of rainy days is September (17.6 days).
The month with the least rainy days is December (6.5 days).
Average snowfall in September
Úlfsá, Iceland
- Average snowfall in September: 15mm
The month with the highest snowfall is March (249mm).
The month with the least snowfall is July (0mm).
Average snowfall days in September
Úlfsá, Iceland
- Average snowfall days in September: 1.5 days
The month with the highest number of snowfall days is March (17.5 days).
The month with the least snowfall days is July (0 days).
Average sea temperature in September
Úlfsá, Iceland
- Average sea temperature in September: 6°C
The best months for swimming (with the highest average sea temperature) are July and August (7°C).
The coldest months (with the lowest average sea temperature) are January, February, March and April (3°C).
Average daylight in September /
Average sunshine in September
Úlfsá, Iceland
- Average daylight in September: 13h and 1min
The month with the longest days is July (Average daylight: 21h and 0min).
The month with the shortest days is December (Average daylight: 3h and 6min).
- Average sunshine in September: 3h and 3min
The month with the most sunshine is August (Average sunshine: 5h and 48min).
The month with the least sunshine is June (Average sunshine: 0h and 24min).
Average sunshine days in September
Úlfsá, Iceland
- Average sunshine days in September: 9.5 days
The month with the most sunshine days is June (18 days).
The month with the least sunshine days is February (6.7 days).
Average UV index in September
Úlfsá, Iceland
- Average UV index in September: 2
The month with the highest UV index is July (UV index 3).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 1).
Average cloud cover in September
Úlfsá, Iceland
- Average cloud cover in September: 74
The month with the most cloud cover is March (Cloud cover 81).
The month with the least cloud cover is June (Cloud cover 65).
Average visibility in September
Úlfsá, Iceland
- Average visibility in September: 9km
The months with the highest visibility are May, June, July, August, September and October (9km).
The months with the lowest visibility are January, February, March, April, November and December (8km).
