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September Weather in Grundarhverfi, Iceland

Last updated: August 23, 2025

In Grundarhverfi, Iceland, the average temperature in September hovers around 8°C (47°F). Expect chilly nights with a minimum temperature of -3°C (27°F), while daytime highs can reach up to 16°C (61°F). Be prepared for a wet month, as precipitation amounts typically hit 162 mm (6.4 in) over approximately 20 days. With an average humidity of 92%, don’t forget your umbrella and a warm jacket!

September Temperature in Grundarhverfi

In September in Grundarhverfi, the average temperature is 8°C (47°F). Maximums can reach 16°C (61°F) and minimums can be as low as -3°C (27°F). Be prepared for a range of temperatures and pack accordingly for your trip!

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

The chart illustrates September temperature patterns in Grundarhverfi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grundarhverfi, September typically has an average temperature of 8°C (47°F), with highs reaching up to 16°C (61°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec303133394449525246413431
Data source: Temperature data for Grundarhverfi 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 Grundarhverfi

In Grundarhverfi in September, the total precipitation amount is 162 mm (6.4 in), occurring over the course of 20 days.

September Precipitation Trends in Grundarhverfi

The chart displays monthly precipitation patterns in Grundarhverfi, 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 Grundarhverfi, September typically receives around 162 mm (6.4 inches) of precipitation spread over approximately 20 days.
JanFebMarAprMayJunJulAugSepOctNovDec11813110612311894768316394105107
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Grundarhverfi

In Grundarhverfi in September humidity is 92%. With an average temperature of 8°C (47°F), this humidity feels like a heavy blanket enveloping you, making outdoor activities uncomfortable and exhausting for travelers.

September Average Humidity in Grundarhverfi

This chart illustrates the average monthly humidity levels in Grundarhverfi, 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 Grundarhverfi is approximately 92%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec96%95%94%87%85%81%86%88%92%93%94%95%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Grundarhverfi

In Grundarhverfi 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 Grundarhverfi, you can check the information here.

Maximum UV Index Levels in Grundarhverfi for September

The chart shows the monthly maximum UV Index (UVI) for Grundarhverfi 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 Grundarhverfi typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec112456643211
Data source: Grundarhverfi 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 Grundarhverfi Compares to Other Months

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

This table compares monthly weather conditions in Grundarhverfi, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)118 mm (4.6 inches)96%low
February Weather-1°C (31°F)131 mm (5.1 inches)95%low
March Weather1°C (33°F)106 mm (4.2 inches)94%low
April Weather4°C (39°F)123 mm (4.8 inches)87%moderate
May Weather7°C (44°F)118 mm (4.6 inches)85%moderate
June Weather9°C (49°F)94 mm (3.7 inches)81%high
July Weather11°C (53°F)76 mm (3.0 inches)86%high
August Weather11°C (52°F)83 mm (3.3 inches)88%moderate
September Weather8°C (47°F)162 mm (6.4 inches)92%moderate
October Weather5°C (41°F)94 mm (3.7 inches)93%low
November Weather1°C (34°F)105 mm (4.1 inches)94%low
December Weather0°C (32°F)107 mm (4.2 inches)95%low

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