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September Weather in Karijoki, Finland

Last updated: August 23, 2025

In Karijoki, Finland, the average temperature in September hovers around 11°C (51°F), with extremes ranging from a chilly -2°C (29°F) to a pleasant 24°C (75°F). Expect 78 mm (3.1 in) of precipitation spread over 13 days, contributing to an average humidity level of 88%.

September Temperature in Karijoki

In September in Karijoki, the average temperature is 11°C (51°F). The maximum can reach 24°C (75°F), and the minimum can be as low as -2°C (29°F). Be prepared for a variety of weather conditions, making it essential to pack layers for your trip.

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

The chart illustrates September temperature patterns in Karijoki, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Karijoki, September typically has an average temperature of 11°C (51°F), with highs reaching up to 24°C (75°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec252329384860635951423528
Data source: Temperature data for Karijoki 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 Karijoki

In Karijoki in September, the precipitation amount is 78 mm (3.1 in) spread over 13 days.

September Precipitation Trends in Karijoki

The chart displays monthly precipitation patterns in Karijoki, 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 Karijoki, September typically receives around 78 mm (3.1 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec4146464343597810778796462
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Karijoki

In Karijoki in September humidity is 88%. With an average temperature of 11°C (51°F), this humidity feels like traveling through a damp, heavy blanket, making every step slightly more laborious and the air thick with moisture, which can be quite uncomfortable for exploration.

September Average Humidity in Karijoki

This chart illustrates the average monthly humidity levels in Karijoki, 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 Karijoki is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec95%93%91%85%77%75%80%82%88%92%92%93%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Karijoki

In Karijoki 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 Karijoki, you can check the information here.

Maximum UV Index Levels in Karijoki for September

The chart shows the monthly maximum UV Index (UVI) for Karijoki 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 Karijoki typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec113456653211
Data source: Karijoki 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 Karijoki Compares to Other Months

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

This table compares monthly weather conditions in Karijoki, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (26°F)41 mm (1.6 inches)95%low
February Weather-5°C (24°F)46 mm (1.8 inches)93%low
March Weather-2°C (29°F)46 mm (1.8 inches)91%moderate
April Weather3°C (38°F)43 mm (1.7 inches)85%moderate
May Weather9°C (49°F)43 mm (1.7 inches)77%moderate
June Weather15°C (60°F)58 mm (2.3 inches)74%high
July Weather17°C (63°F)78 mm (3.1 inches)80%high
August Weather15°C (60°F)107 mm (4.2 inches)82%moderate
September Weather11°C (51°F)78 mm (3.1 inches)88%moderate
October Weather6°C (42°F)79 mm (3.1 inches)92%low
November Weather2°C (35°F)64 mm (2.5 inches)92%low
December Weather-2°C (29°F)62 mm (2.5 inches)93%low

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