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September Weather in Semnice, Czech Republic

Last updated: August 23, 2025

In September, the average temperature in Semnice, Czech Republic is a mild 13°C (55°F), with a minimum dipping to 0°C (32°F) and a maximum reaching 28°C (83°F). Expect some wet days, as precipitation averages around 60 mm (2.4 in) over 10 days. You’ll also find the air quite humid, with an average humidity of 81%.

September Temperature in Semnice

In September in Semnice, the average temperature is 13°C (55°F). The maximum can reach 28°C (83°F), while the minimum can drop as low as 0°C (32°F). This range of temperatures makes it advisable for travelers to pack layers to comfortably enjoy both warm and cooler moments during their visit.

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

The chart illustrates September temperature patterns in Semnice, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Semnice, September typically has an average temperature of 13°C (55°F), with highs reaching up to 28°C (83°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec303237455262636455473833
Data source: Temperature data for Semnice 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 Semnice

In Semnice in September, the precipitation amount is 60 mm (2.4 in) accumulated over a period of 10 days.

September Precipitation Trends in Semnice

The chart displays monthly precipitation patterns in Semnice, 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 Semnice, September typically receives around 60 mm (2.4 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec565261408581809160603767
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Semnice

In Semnice in September, humidity is 81%. With an average temperature of 13°C (55°F), this humidity feels like a damp blanket wrapping around you, making strolls outdoors feel heavy and slightly oppressive, which may be less than ideal for travelers looking to explore comfortably.

September Average Humidity in Semnice

This chart illustrates the average monthly humidity levels in Semnice, 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 Semnice is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%89%87%81%71%75%74%76%81%85%88%92%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Semnice

In Semnice 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 Semnice, you can refer to this Hourly UV Index in Semnice.

Maximum UV Index Levels in Semnice for September

The chart shows the monthly maximum UV Index (UVI) for Semnice 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 Semnice typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235688876421
Data source: Semnice 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 Semnice Compares to Other Months

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

This table compares monthly weather conditions in Semnice, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)56 mm (2.2 inches)90%low
February Weather0°C (32°F)52 mm (2.0 inches)89%moderate
March Weather3°C (37°F)61 mm (2.4 inches)87%moderate
April Weather7°C (45°F)40 mm (1.6 inches)81%high
May Weather11°C (53°F)85 mm (3.3 inches)71%very high
June Weather17°C (63°F)81 mm (3.2 inches)75%very high
July Weather17°C (63°F)80 mm (3.1 inches)74%very high
August Weather18°C (64°F)91 mm (3.6 inches)76%high
September Weather13°C (55°F)60 mm (2.4 inches)81%high
October Weather8°C (47°F)60 mm (2.4 inches)85%moderate
November Weather3°C (38°F)37 mm (1.4 inches)88%low
December Weather0°C (33°F)67 mm (2.7 inches)92%low

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