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September Weather in Halikko, Finland

Last updated: August 23, 2025

In September, the average temperature in Halikko, Finland is a mild 12°C (53°F). Be prepared for a temperature range that can dip as low as -3°C (27°F) at its coldest and rise to a pleasant 24°C (75°F) at its warmest. During this month, expect 58 mm (2.3 in) of precipitation over approximately 12 days, coupled with high humidity levels averaging around 90%.

September Temperature in Halikko

In September in Halikko, the average temperature is 12°C (53°F). Maximums can reach 24°C (75°F), while minimums can be as low as -3°C (27°F). This varied climate makes Halikko an intriguing destination for travelers seeking both mild days and crisp nights.

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

The chart illustrates September temperature patterns in Halikko, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Halikko, September typically has an average temperature of 12°C (53°F), with highs reaching up to 24°C (75°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec272531395061646153443730
Data source: Temperature data for Halikko 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 Halikko

In Halikko in September, the precipitation amount is 58 mm (2.3 in) spread over 12 days.

September Precipitation Trends in Halikko

The chart displays monthly precipitation patterns in Halikko, 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 Halikko, September typically receives around 58 mm (2.3 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec504448385551788958765369
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Halikko

In Halikko in September, humidity is 90%. With an average temperature of 12°C (53°F), this humidity feels like a damp chill that clings to your skin, making outdoor adventures uncomfortable and travel plans less appealing.

September Average Humidity in Halikko

This chart illustrates the average monthly humidity levels in Halikko, 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 Halikko is approximately 90%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec97%95%93%87%75%75%80%83%90%93%94%95%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Halikko

In Halikko in September, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Halikko for better planning.

Maximum UV Index Levels in Halikko for September

The chart shows the monthly maximum UV Index (UVI) for Halikko 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 Halikko typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123457754211
Data source: Halikko 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 Halikko Compares to Other Months

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

This table compares monthly weather conditions in Halikko, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (28°F)50 mm (2.0 inches)97%low
February Weather-4°C (25°F)44 mm (1.7 inches)95%low
March Weather-1°C (31°F)47 mm (1.9 inches)93%moderate
April Weather4°C (39°F)38 mm (1.5 inches)86%moderate
May Weather10°C (50°F)55 mm (2.2 inches)75%moderate
June Weather16°C (62°F)51 mm (2.0 inches)75%high
July Weather18°C (64°F)78 mm (3.1 inches)80%high
August Weather16°C (61°F)89 mm (3.5 inches)83%moderate
September Weather12°C (53°F)58 mm (2.3 inches)90%moderate
October Weather7°C (44°F)76 mm (3.0 inches)93%low
November Weather3°C (38°F)53 mm (2.1 inches)94%low
December Weather-1°C (30°F)69 mm (2.7 inches)95%low

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