September Weather in Karlstad, United States

Last updated: June 24, 2025

In September, the average temperature in Karlstad, United States hovers around 14°C (58°F). During this month, temperatures can dip as low as -3°C (26°F) and soar up to 31°C (88°F). Expect 76 mm (3.0 in) of precipitation over approximately 10 days, accompanied by an average humidity of 75%. Stay prepared for a mix of mild and potentially warm days!

September Temperature in Karlstad

In September in Karlstad, the average temperature is 14°C (58°F). Maximum temperatures can reach 31°C (88°F), while the minimum can drop as low as -3°C (26°F). Travelers should be prepared for a wide range of temperatures during this month.

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

The chart illustrates September temperature patterns in Karlstad, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Karlstad, September typically has an average temperature of 14°C (58°F), with highs reaching up to 31°C (88°F) and lows dropping to around -3°C (26°F).
JanFebMarAprMayJunJulAugSepOctNovDec7625375467716758422515
Data source: Temperature data for Karlstad 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 Karlstad

In Karlstad in September, the total precipitation amount is 76 mm (3.0 in) spread over a period of 10 days.

September Precipitation Trends in Karlstad

The chart displays monthly precipitation patterns in Karlstad, 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 Karlstad, September typically receives around 76 mm (3.0 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec182124345488757376842933
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Karlstad

In Karlstad in September humidity is 75%. With an average temperature of 14°C (58°F), this humidity feels like a lingering blanket of warmth, making travel both refreshing and a bit stifling, as the moisture in the air may leave you feeling slightly sticky while enjoying outdoor adventures.

September Average Humidity in Karlstad

This chart illustrates the average monthly humidity levels in Karlstad, 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 Karlstad is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec94%91%90%81%74%75%75%77%75%78%87%93%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Karlstad

In Karlstad in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Karlstad.

Maximum UV Index Levels in Karlstad for September

The chart shows the monthly maximum UV Index (UVI) for Karlstad 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 Karlstad typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235789887422
Data source: Karlstad 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 Karlstad Compares to Other Months

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

This table compares monthly weather conditions in Karlstad, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-14°C (8°F)18 mm (0.7 inches)94%low
February Weather-15°C (6°F)20 mm (0.8 inches)91%moderate
March Weather-4°C (25°F)24 mm (0.9 inches)90%moderate
April Weather3°C (38°F)34 mm (1.3 inches)81%high
May Weather12°C (55°F)54 mm (2.1 inches)74%very high
June Weather19°C (67°F)88 mm (3.5 inches)75%very high
July Weather21°C (71°F)75 mm (2.9 inches)74%very high
August Weather19°C (67°F)73 mm (2.9 inches)77%very high
September Weather14°C (58°F)76 mm (3.0 inches)75%high
October Weather6°C (42°F)83 mm (3.3 inches)78%moderate
November Weather-4°C (25°F)29 mm (1.1 inches)87%low
December Weather-10°C (15°F)33 mm (1.3 inches)93%low

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