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September Weather in Sisak, Croatia

Last updated: August 23, 2025

In September, the average temperature in Sisak, Croatia is a mild 18°C (65°F). However, be prepared for a range, as the temperature can dip to a minimum of 3°C (37°F) and soar to a maximum of 35°C (95°F). Expect 97 mm (3.8 in) of precipitation spread over 8 days, with average humidity sitting comfortably at 62%.

September Temperature in Sisak

In September in Sisak, the average temperature is 18°C (65°F). Maximums can reach 35°C (95°F), and minimums can be as low as 3°C (37°F). This climate makes Sisak an ideal destination for travelers seeking mild weather with the possibility of warm days and cool nights.

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

The chart illustrates September temperature patterns in Sisak, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sisak, September typically has an average temperature of 18°C (65°F), with highs reaching up to 35°C (95°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec354146556372747564554639
Data source: Temperature data for Sisak 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 Sisak

In Sisak in September, the total precipitation amount is 97 mm (3.8 in), occurring over a span of 8 days.

September Precipitation Trends in Sisak

The chart displays monthly precipitation patterns in Sisak, 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 Sisak, September typically receives around 97 mm (3.8 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec4466556710880797197818584
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Sisak

In Sisak in September, humidity is 62%. With an average temperature of 18°C (65°F), this humidity feels like a warm embrace, making outdoor activities enjoyable yet mildly sticky, perfect for leisurely strolls but a bit challenging for vigorous excursions.

September Average Humidity in Sisak

This chart illustrates the average monthly humidity levels in Sisak, 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 Sisak is approximately 62%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%83%75%72%70%69%64%51%62%81%87%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Sisak

In Sisak in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Sisak, you can refer to this Hourly UV Index in Sisak.

Maximum UV Index Levels in Sisak for September

The chart shows the monthly maximum UV Index (UVI) for Sisak 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 Sisak typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689986532
Data source: Sisak 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 Sisak Compares to Other Months

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

This table compares monthly weather conditions in Sisak, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (35°F)44 mm (1.7 inches)89%low
February Weather5°C (41°F)66 mm (2.6 inches)83%moderate
March Weather8°C (47°F)55 mm (2.2 inches)75%moderate
April Weather13°C (55°F)67 mm (2.6 inches)72%high
May Weather17°C (63°F)108 mm (4.2 inches)70%very high
June Weather22°C (73°F)80 mm (3.1 inches)69%very high
July Weather23°C (75°F)79 mm (3.1 inches)64%very high
August Weather24°C (75°F)71 mm (2.8 inches)51%very high
September Weather18°C (65°F)97 mm (3.8 inches)62%high
October Weather13°C (55°F)81 mm (3.2 inches)81%moderate
November Weather8°C (47°F)85 mm (3.3 inches)87%moderate
December Weather4°C (39°F)84 mm (3.3 inches)88%low

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