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September Weather in Seltjarnarnes, Iceland

Last updated: August 23, 2025

In Seltjarnarnes, Iceland, the average temperature in September hovers around 8°C (47°F). Expect chilly days, with a minimum of -2°C (29°F) and a maximum reaching 15°C (60°F). Be prepared for frequent rain, as the region receives approximately 164 mm (6.5 in) of precipitation over 20 days. Additionally, enjoy the crisp air with an average humidity level of 92%!

September Temperature in Seltjarnarnes

In September in Seltjarnarnes, the average temperature is 8°C (47°F), with maximums reaching 15°C (60°F) and minimums dropping as low as -2°C (29°F). This mild yet variable climate makes it essential for travelers to pack layers to stay comfortable throughout the day.

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

The chart illustrates September temperature patterns in Seltjarnarnes, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Seltjarnarnes, September typically has an average temperature of 8°C (47°F), with highs reaching up to 15°C (60°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec323234394449525247413533
Data source: Temperature data for Seltjarnarnes 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 Seltjarnarnes

In Seltjarnarnes in September, the total precipitation amount is 164 mm (6.5 in) occurring over the course of 20 days.

September Precipitation Trends in Seltjarnarnes

The chart displays monthly precipitation patterns in Seltjarnarnes, 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 Seltjarnarnes, September typically receives around 164 mm (6.5 inches) of precipitation spread over approximately 20 days.
JanFebMarAprMayJunJulAugSepOctNovDec11412510312111392758316496105106
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Seltjarnarnes

In Seltjarnarnes 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 Seltjarnarnes

This chart illustrates the average monthly humidity levels in Seltjarnarnes, 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 Seltjarnarnes 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 Seltjarnarnes

In Seltjarnarnes 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 Seltjarnarnes, you can check the information here.

Maximum UV Index Levels in Seltjarnarnes for September

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

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

This table compares monthly weather conditions in Seltjarnarnes, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)113 mm (4.5 inches)96%low
February Weather0°C (33°F)125 mm (4.9 inches)95%low
March Weather1°C (34°F)103 mm (4.1 inches)94%low
April Weather4°C (40°F)121 mm (4.8 inches)87%moderate
May Weather7°C (44°F)113 mm (4.4 inches)85%moderate
June Weather9°C (49°F)92 mm (3.6 inches)81%high
July Weather11°C (53°F)75 mm (3.0 inches)86%high
August Weather11°C (52°F)83 mm (3.3 inches)88%moderate
September Weather8°C (47°F)164 mm (6.5 inches)92%moderate
October Weather5°C (42°F)96 mm (3.8 inches)93%low
November Weather2°C (35°F)105 mm (4.1 inches)94%low
December Weather0°C (33°F)106 mm (4.2 inches)95%low

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