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September Weather in Joniskis, Lithuania

Last updated: August 23, 2025

In Joniskis, Lithuania, the average temperature in September hovers around 13°C (57°F). Temperatures can range from a cool -1°C (31°F) to a warm 28°C (82°F). Expect 62 mm (2.4 in) of precipitation spread over 11 days, contributing to an average humidity of 87%. Prepare for a mix of mild weather and moisture!

September Temperature in Joniskis

In September in Joniskis, the average temperature is 13°C (57°F). Maximums can reach 28°C (82°F), while minimums can dip as low as -1°C (31°F). This variation in temperatures makes it essential for travelers to pack accordingly, ensuring they're prepared for both warm days and chilly nights.

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

The chart illustrates September temperature patterns in Joniskis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Joniskis, September typically has an average temperature of 13°C (57°F), with highs reaching up to 28°C (82°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec302935445364656456484032
Data source: Temperature data for Joniskis 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 Joniskis

In Joniskis in September, the precipitation amount is 62 mm (2.4 in) spread over 11 days.

September Precipitation Trends in Joniskis

The chart displays monthly precipitation patterns in Joniskis, 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 Joniskis, September typically receives around 62 mm (2.4 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec413445356453897462615249
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Joniskis

In Joniskis in September humidity is 87%. With an average temperature of 13°C (57°F), this humidity feels like a damp blanket wrapping around you, making it feel heavier and less comfortable for traveling, as every step seems to require more effort in the muggy air.

September Average Humidity in Joniskis

This chart illustrates the average monthly humidity levels in Joniskis, 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 Joniskis is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%91%90%87%72%76%76%80%87%91%92%93%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Joniskis

In Joniskis 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 Joniskis for better planning.

Maximum UV Index Levels in Joniskis for September

The chart shows the monthly maximum UV Index (UVI) for Joniskis 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 Joniskis typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123567764321
Data source: Joniskis 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 Joniskis Compares to Other Months

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

This table compares monthly weather conditions in Joniskis, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)41 mm (1.6 inches)93%low
February Weather-1°C (30°F)34 mm (1.4 inches)91%low
March Weather2°C (35°F)45 mm (1.8 inches)90%moderate
April Weather7°C (44°F)35 mm (1.4 inches)87%moderate
May Weather12°C (53°F)64 mm (2.5 inches)72%high
June Weather18°C (64°F)53 mm (2.1 inches)76%high
July Weather18°C (65°F)88 mm (3.5 inches)76%high
August Weather18°C (64°F)74 mm (2.9 inches)80%high
September Weather13°C (57°F)62 mm (2.4 inches)87%moderate
October Weather9°C (48°F)60 mm (2.4 inches)91%moderate
November Weather4°C (40°F)52 mm (2.0 inches)92%low
December Weather0°C (32°F)49 mm (1.9 inches)93%low

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