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September Weather in Gardur, Iceland

Last updated: August 23, 2025

In September, the average temperature in Gardur, Iceland hovers around 9°C (49°F). Visitors should be prepared for a cool climate, as temperatures can dip to a minimum of 3°C (37°F) and peak at a comfortable 13°C (55°F). With an average precipitation of 178 mm (7.0 in) spread over 21 days, and a high average humidity of 85%, it's advisable to pack accordingly for a wet and chilly experience!

September Temperature in Gardur

In September in Gardur, the average temperature is 9°C (49°F). The maximum can reach 13°C (55°F), while the minimum can be as low as 3°C (37°F). Travelers should prepare for cool weather and dress in layers to stay comfortable during their visit.

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

The chart illustrates September temperature patterns in Gardur, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Gardur, September typically has an average temperature of 9°C (49°F), with highs reaching up to 13°C (55°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec363637404448515248443937
Data source: Temperature data for Gardur 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 Gardur

In Gardur in September, the precipitation amount is 178 mm (7.0 in) spread over a total of 21 days.

September Precipitation Trends in Gardur

The chart displays monthly precipitation patterns in Gardur, 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 Gardur, September typically receives around 178 mm (7.0 inches) of precipitation spread over approximately 21 days.
JanFebMarAprMayJunJulAugSepOctNovDec120125116131111817791179125126124
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Gardur

In Gardur in September humidity is 85%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill that seeps into your bones, making every step outside a challenge as the moisture in the air weighs heavily and lingers, transforming even simple outings into a quest for comfort.

September Average Humidity in Gardur

This chart illustrates the average monthly humidity levels in Gardur, 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 Gardur is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%77%82%80%85%85%87%88%85%85%81%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Gardur

In Gardur 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 Gardur, you can check the information here.

Maximum UV Index Levels in Gardur for September

The chart shows the monthly maximum UV Index (UVI) for Gardur 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 Gardur typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec112356643211
Data source: Gardur 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 Gardur Compares to Other Months

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

This table compares monthly weather conditions in Gardur, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (36°F)120 mm (4.7 inches)80%low
February Weather2°C (36°F)125 mm (4.9 inches)77%low
March Weather3°C (37°F)116 mm (4.6 inches)82%low
April Weather5°C (41°F)131 mm (5.2 inches)80%moderate
May Weather6°C (44°F)111 mm (4.4 inches)85%moderate
June Weather9°C (48°F)81 mm (3.2 inches)85%high
July Weather10°C (51°F)77 mm (3.0 inches)87%high
August Weather11°C (52°F)91 mm (3.6 inches)88%moderate
September Weather9°C (49°F)178 mm (7.0 inches)85%moderate
October Weather7°C (44°F)125 mm (4.9 inches)85%low
November Weather4°C (40°F)126 mm (5.0 inches)81%low
December Weather3°C (38°F)124 mm (4.9 inches)80%low

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