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September Weather in Katashina, Japan

Last updated: August 23, 2025

In Katashina, Japan, the average temperature in September hovers around 18°C (64°F), with a comfortable range between a minimum of 5°C (42°F) and a maximum of 28°C (83°F). Prepare for a wet month, as precipitation reaches 189 mm (7.5 in) over 21 days. With an average humidity of 89%, it's a good time to enjoy the lush greenery that follows the rain!

September Temperature in Katashina

In September in Katashina, the average temperature is 18°C (64°F). The maximum can reach 28°C (83°F), while the minimum can drop to as low as 5°C (42°F). It's an ideal time for travelers to enjoy a mix of warm days and cooler evenings, making it perfect for both outdoor adventures and cozy nights.

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

The chart illustrates September temperature patterns in Katashina, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Katashina, September typically has an average temperature of 18°C (64°F), with highs reaching up to 28°C (83°F) and lows dropping to around 5°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec272837455662697264544332
Data source: Temperature data for Katashina 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 Katashina

In Katashina in September, the precipitation amount is 189 mm (7.5 in) over a span of 21 days.

September Precipitation Trends in Katashina

The chart displays monthly precipitation patterns in Katashina, 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 Katashina, September typically receives around 189 mm (7.5 inches) of precipitation spread over approximately 21 days.
JanFebMarAprMayJunJulAugSepOctNovDec81781361341461832942111892466593
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Katashina

In Katashina in September, humidity is 89%. With an average temperature of 18°C (64°F), this humidity feels like a thick blanket enveloping you, making travel feel heavy and sluggish, as every step seems to weigh you down in the warm, muggy air.

September Average Humidity in Katashina

This chart illustrates the average monthly humidity levels in Katashina, 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 Katashina is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%81%79%81%88%92%92%89%87%85%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Katashina

In Katashina in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Katashina.

Maximum UV Index Levels in Katashina for September

The chart shows the monthly maximum UV Index (UVI) for Katashina 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 Katashina typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469101111111110753
Data source: Katashina 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 Katashina Compares to Other Months

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

This table compares monthly weather conditions in Katashina, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)80 mm (3.2 inches)88%moderate
February Weather-2°C (29°F)78 mm (3.1 inches)86%high
March Weather3°C (37°F)136 mm (5.4 inches)81%very high
April Weather7°C (45°F)134 mm (5.3 inches)78%very high
May Weather13°C (56°F)146 mm (5.7 inches)81%extreme
June Weather17°C (62°F)183 mm (7.2 inches)88%extreme
July Weather21°C (70°F)294 mm (11.6 inches)92%extreme
August Weather22°C (72°F)211 mm (8.3 inches)92%extreme
September Weather18°C (64°F)189 mm (7.5 inches)89%very high
October Weather12°C (54°F)246 mm (9.7 inches)87%high
November Weather6°C (43°F)65 mm (2.6 inches)85%moderate
December Weather0°C (32°F)93 mm (3.7 inches)86%moderate

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