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September Weather in Karlshamn, Sweden

Last updated: August 27, 2025

In Karlshamn, Sweden, the average temperature in September hovers around 14°C (57°F), with a minimum of 2°C (36°F) and a maximum reaching 23°C (73°F). Expect about 64 mm (2.5 in) of precipitation spread across 12 days, contributing to an average humidity level of 82%.

September Temperature in Karlshamn

In September in Karlshamn, the average temperature is 14°C (57°F). Maximum temperatures can reach 23°C (73°F), while minimum temperatures may drop as low as 2°C (36°F). It's a great time to visit if you enjoy mild weather and the possibility of layering clothing for both warmth and comfort.

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

The chart illustrates September temperature patterns in Karlshamn, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Karlshamn, September typically has an average temperature of 14°C (57°F), with highs reaching up to 23°C (73°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec353437435161636357504337
Data source: Temperature data for Karlshamn 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 Karlshamn

In Karlshamn in September, the total precipitation amount is 64 mm (2.5 in) over the course of 12 days.

September Precipitation Trends in Karlshamn

The chart displays monthly precipitation patterns in Karlshamn, 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 Karlshamn, September typically receives around 64 mm (2.5 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec516259345250688264845777
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Karlshamn

In Karlshamn in September, humidity is 82%. With an average temperature of 14°C (57°F), this humidity feels like a thick blanket enveloping you, making outdoor activities uncomfortable and travel more challenging due to the heavy, damp air.

September Average Humidity in Karlshamn

This chart illustrates the average monthly humidity levels in Karlshamn, 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 Karlshamn is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec92%91%89%82%70%65%65%71%82%90%92%91%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Karlshamn

In Karlshamn in September, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Karlshamn.

Maximum UV Index Levels in Karlshamn for September

The chart shows the monthly maximum UV Index (UVI) for Karlshamn 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 Karlshamn typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123567765311
Data source: Karlshamn 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 Karlshamn Compares to Other Months

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

This table compares monthly weather conditions in Karlshamn, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (35°F)51 mm (2.0 inches)92%low
February Weather1°C (35°F)62 mm (2.5 inches)91%low
March Weather3°C (37°F)59 mm (2.3 inches)89%moderate
April Weather6°C (43°F)34 mm (1.3 inches)82%moderate
May Weather11°C (52°F)52 mm (2.0 inches)70%high
June Weather16°C (62°F)50 mm (2.0 inches)65%high
July Weather17°C (64°F)68 mm (2.7 inches)65%high
August Weather17°C (63°F)82 mm (3.2 inches)71%high
September Weather14°C (57°F)64 mm (2.5 inches)82%moderate
October Weather10°C (50°F)84 mm (3.3 inches)90%moderate
November Weather6°C (43°F)57 mm (2.2 inches)92%low
December Weather3°C (37°F)77 mm (3.0 inches)91%low

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