September weather forecastKeldur, Iceland
September
Weather in September
September, the first month of the autumn in Keldur, is still a cool month, with an average temperature fluctuating between 10.8°C (51.4°F) and 8.5°C (47.3°F).Temperature
Keldur experiences an average high-temperature of a still cool 10.8°C (51.4°F) in September, subtly different from August's 12.3°C (54.1°F). The temperature during September nights demonstrates a small drop from the daytime highs, settling to an average of 8.5°C (47.3°F).Humidity
The average relative humidity in September is 79%.Rainfall
In Keldur, during September, the rain falls for 21.5 days and regularly aggregates up to 105mm (4.13") of precipitation. In Keldur, during the entire year, the rain falls for 215.2 days and collects up to 1116mm (43.94") of precipitation.Snowfall
In Keldur, snow does not fall in June through September.Daylight
In Keldur, the average length of the day in September is 13h and 0min.On the first day of the month, sunrise is at 06:05 and sunset at 20:34. On the last day of September, sunrise is at 07:27 and sunset at 18:52 GMT.
Sunshine
The average sunshine in September in Keldur is 5.4h.UV index
In Keldur, Iceland, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: In September, the average maximum UV index of 3 translates into the following recommendations:
Act with care - The suggestion to avoid sunburn is emphasized. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Keldur, Iceland
- Average high temperature in September: 10.8°C
The warmest months (with the highest average high temperature) are July and August (12.3°C).
The month with the lowest average high temperature is December (4.5°C).
- Average low temperature in September: 8.5°C
The months with the highest average low temperature are July and August (9.7°C).
The coldest months (with the lowest average low temperature) are March and December (1.9°C).
Average pressure in September
Keldur, Iceland
- Average pressure in September: 1003.1mbar
The month with the highest atmospheric pressure is June (1013.8mbar).
The month with the lowest atmospheric pressure is January (996.8mbar).
Average wind speed in September
Keldur, Iceland
- Average wind speed in September: 27.2km/h
The windiest month (with the highest average wind speed) is February (34.7km/h).
The calmest month (with the lowest average wind speed) is July (19.5km/h).
Average humidity in September
Keldur, Iceland
- Average humidity in September: 79%
The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is December (73%).
Average rainfall in September
Keldur, Iceland
- Average rainfall in September: 105mm
The wettest month (with the highest rainfall) is January (130mm).
The driest month (with the least rainfall) is June (48mm).
Average rainfall days in September
Keldur, Iceland
- Average rainfall days in September: 21.5 days
The month with the highest number of rainy days is September (21.5 days).
The month with the least rainy days is June (15 days).
Average snowfall in September
Keldur, Iceland
- Average snowfall in September: 0mm
The month with the highest snowfall is March (115mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Keldur, Iceland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is March (7.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Keldur, Iceland
- Average daylight in September: 13h and 0min
The month with the longest days is June (Average daylight: 20h and 36min).
The month with the shortest days is December (Average daylight: 4h and 36min).
- Average sunshine in September: 5h and 24min
The months with the most sunshine are May, June and July (Average sunshine: 8h and 36min).
The month with the least sunshine is January (Average sunshine: 2h and 36min).
Average sunshine days in September
Keldur, Iceland
- Average sunshine days in September: 7.2 days
The month with the most sunshine days is June (12.8 days).
The month with the least sunshine days is March (5.8 days).
Average UV index in September
Keldur, 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, October, November and December (UV index 2).
Average cloud cover in September
Keldur, Iceland
- Average cloud cover in September: 58
The month with the most cloud cover is March (Cloud cover 65).
The months with the least cloud cover are May and August (Cloud cover 55).
Average visibility in September
Keldur, Iceland
- Average visibility in September: 9km
The months with the highest visibility are May and June (10km).
The months with the lowest visibility are January, February, March, April, July, August, September, October, November and December (9km).
