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September Weather in Istra, Russian Federation

Last updated: August 27, 2025

In September, the average temperature in Istra, Russian Federation is a mild 12°C (54°F). Expect temperatures to vary; while the minimum can dip to 0°C (32°F), the maximum can reach a warm 28°C (83°F). Be prepared for some rain, as the area receives an average precipitation of 62 mm (2.4 in) over approximately 10 days. With an average humidity of 86%, the air will feel quite moist, so pack accordingly!

September Temperature in Istra

In September in Istra, the average temperature is 12°C (54°F). Maximum temperatures can reach 28°C (83°F), while minimums can drop as low as 0°C (32°F). This moderate climate makes Istra an ideal destination for travelers seeking a mix of warm and cool weather.

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

The chart illustrates September temperature patterns in Istra, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Istra, September typically has an average temperature of 12°C (54°F), with highs reaching up to 28°C (83°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec222330425462656354443325
Data source: Temperature data for Istra 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 Istra

In Istra in September, the total precipitation amount is 62 mm (2.4 in) over a period of 10 days.

September Precipitation Trends in Istra

The chart displays monthly precipitation patterns in Istra, 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 Istra, September typically receives around 62 mm (2.4 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec4246435274831106962574662
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Istra

In Istra in September, humidity is 86%. With an average temperature of 12°C (54°F), this humidity feels like a damp blanket wrapping around you, making outdoor activities uncomfortable and travel challenging due to the heavy, muggy atmosphere.

September Average Humidity in Istra

This chart illustrates the average monthly humidity levels in Istra, 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 Istra is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec97%95%92%83%75%76%79%78%86%91%95%94%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Istra

In Istra in September, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Istra.

Maximum UV Index Levels in Istra for September

The chart shows the monthly maximum UV Index (UVI) for Istra 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 Istra typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124567765321
Data source: Istra 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 Istra Compares to Other Months

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

This table compares monthly weather conditions in Istra, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)42 mm (1.7 inches)97%low
February Weather-5°C (23°F)46 mm (1.8 inches)95%low
March Weather-1°C (30°F)43 mm (1.7 inches)92%moderate
April Weather5°C (42°F)52 mm (2.1 inches)83%moderate
May Weather12°C (54°F)74 mm (2.9 inches)75%high
June Weather17°C (63°F)83 mm (3.3 inches)76%high
July Weather18°C (65°F)109 mm (4.3 inches)79%high
August Weather17°C (63°F)69 mm (2.7 inches)78%high
September Weather12°C (54°F)62 mm (2.4 inches)86%moderate
October Weather7°C (44°F)57 mm (2.2 inches)91%moderate
November Weather1°C (33°F)46 mm (1.8 inches)95%low
December Weather-4°C (25°F)62 mm (2.4 inches)94%low

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