September weather forecastHafnir, Iceland
September
Weather in September
The first month of the autumn, September, is also a fresh month in Hafnir, Iceland, with an average temperature ranging between max 10.3°C (50.5°F) and min 8.4°C (47.1°F).Temperature
Hafnir experiences a minor change to a still fresh 10.3°C (50.5°F) in average high-temperature during September, closely reflecting August. With a barely noticeable fluctuation in temperature, Hafnir reaches an average low of 8.4°C (47.1°F) during the September nights.Humidity
The average relative humidity in September is 79%.Rainfall
In Hafnir, in September, it is raining for 19.9 days, with typically 86mm (3.39") of accumulated precipitation. Throughout the year, in Hafnir, there are 193.9 rainfall days, and 833mm (32.8") of precipitation is accumulated.Snowfall
June through September are months without snowfall in Hafnir.Daylight
In Hafnir, the average length of the day in September is 13h and 0min.On the first day of September, sunrise is at 06:15 and sunset at 20:45. On the last day of the month, sunrise is at 07:38 and sunset at 19:02 GMT.
Sunshine
The average sunshine in September in Hafnir is 4.8h.UV index
The average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for average individuals.Note: An average maximum UV index of 3 in September leads to these recommendations:
Undertake protective steps - Recommendations to avoid sunburn are issued. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Hafnir, Iceland
- Average high temperature in September: 10.3°C
The warmest months (with the highest average high temperature) are July and August (12.2°C).
The months with the lowest average high temperature are February, March and December (4.2°C).
- Average low temperature in September: 8.4°C
The month with the highest average low temperature is July (9.9°C).
The coldest months (with the lowest average low temperature) are March and December (1.3°C).
Average pressure in September
Hafnir, Iceland
- Average pressure in September: 1002.6mbar
The month with the highest atmospheric pressure is June (1013.7mbar).
The month with the lowest atmospheric pressure is January (996.1mbar).
Average wind speed in September
Hafnir, Iceland
- Average wind speed in September: 27.9km/h
The windiest month (with the highest average wind speed) is February (35km/h).
The calmest month (with the lowest average wind speed) is June (20.1km/h).
Average humidity in September
Hafnir, Iceland
- Average humidity in September: 79%
The months with the highest relative humidity are July and August (81%).
The month with the lowest relative humidity is December (74%).
Average rainfall in September
Hafnir, Iceland
- Average rainfall in September: 86mm
The wettest month (with the highest rainfall) is January (99mm).
The driest month (with the least rainfall) is June (35mm).
Average rainfall days in September
Hafnir, Iceland
- Average rainfall days in September: 19.9 days
The month with the highest number of rainy days is September (19.9 days).
The month with the least rainy days is June (12.5 days).
Average snowfall in September
Hafnir, Iceland
- Average snowfall in September: 0mm
The month with the highest snowfall is March (75mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Hafnir, Iceland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is March (8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Hafnir, Iceland
- Average daylight in September: 13h and 0min
The month with the longest days is June (Average daylight: 20h and 42min).
The month with the shortest days is December (Average daylight: 4h and 30min).
- Average sunshine in September: 4h and 48min
The month with the most sunshine is August (Average sunshine: 7h and 36min).
The month with the least sunshine is January (Average sunshine: 2h and 18min).
Average sunshine days in September
Hafnir, Iceland
- Average sunshine days in September: 8.5 days
The month with the most sunshine days is June (15 days).
The months with the least sunshine days are March and April (7.1 days).
Average UV index in September
Hafnir, Iceland
- Average UV index in September: 3
The month with the highest UV index is July (UV index 4).
The months with the lowest UV index are January, February, March, April, May, October, November and December (UV index 2).
Average cloud cover in September
Hafnir, Iceland
- Average cloud cover in September: 63
The month with the most cloud cover is March (Cloud cover 69).
The months with the least cloud cover are May, July and August (Cloud cover 60).
Average visibility in September
Hafnir, Iceland
- Average visibility in September: 9km
The months with the highest visibility are June and August (10km).
The months with the lowest visibility are January, February, March, April, May, July, September, October, November and December (9km).
