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September Weather in Alftanes, Iceland

Last updated: August 23, 2025

In September, the average temperature in Alftanes, Iceland hovers around 8°C (47°F), with lows dipping to -2°C (29°F) and highs reaching up to 16°C (60°F). Expect 163 mm (6.4 in) of precipitation over 22 days, contributing to an average humidity of 87%. Be prepared for a mix of brisk days and cozy indoor moments!

September Temperature in Alftanes

In September in Alftanes, the average temperature is 8°C (47°F), with maximums reaching up to 16°C (60°F) and minimums dropping as low as -2°C (29°F). Be sure to pack layers to stay comfortable while exploring.

September Weather in Alftanes: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Alftanes, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Alftanes, September typically has an average temperature of 8°C (47°F), with highs reaching up to 16°C (60°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec333335404449525247423634
Data source: Temperature data for Alftanes generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Alftanes

In Alftanes in September, the precipitation amount is 163 mm (6.4 in) over the course of 22 days.

September Precipitation Trends in Alftanes

The chart displays monthly precipitation patterns in Alftanes, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Alftanes, September typically receives around 163 mm (6.4 inches) of precipitation spread over approximately 22 days.
JanFebMarAprMayJunJulAugSepOctNovDec118135105138124978190163111112114
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Alftanes

In Alftanes in September, humidity is 87%. With an average temperature of 8°C (47°F), this humidity feels like a damp chill that clings to your skin, making outdoor exploration uncomfortably muggy despite the cool air.

September Average Humidity in Alftanes

This chart illustrates the average monthly humidity levels in Alftanes, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Alftanes is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%85%81%83%82%86%87%87%88%85%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Alftanes

In Alftanes in September, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Alftanes, you can check the information here.

Maximum UV Index Levels in Alftanes for September

The chart shows the monthly maximum UV Index (UVI) for Alftanes in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Alftanes typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec112356643211
Data source: Alftanes September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Alftanes Compares to Other Months

Weather in Alftanes varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Alftanes, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Alftanes, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (33°F)118 mm (4.6 inches)84%low
February Weather1°C (34°F)135 mm (5.3 inches)82%low
March Weather2°C (35°F)105 mm (4.1 inches)85%low
April Weather4°C (40°F)138 mm (5.4 inches)81%moderate
May Weather7°C (44°F)124 mm (4.9 inches)83%moderate
June Weather9°C (49°F)97 mm (3.8 inches)82%high
July Weather11°C (53°F)81 mm (3.2 inches)86%high
August Weather11°C (52°F)90 mm (3.6 inches)87%moderate
September Weather8°C (47°F)163 mm (6.4 inches)87%moderate
October Weather5°C (42°F)111 mm (4.4 inches)88%low
November Weather2°C (36°F)112 mm (4.4 inches)85%low
December Weather1°C (34°F)114 mm (4.5 inches)84%low

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