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September Weather in Shiozawa, Japan

Last updated: August 23, 2025

In Shiozawa, Japan, the average temperature in September hovers around 19°C (67°F), with minimums dipping to 6°C (43°F) and peaks reaching 31°C (89°F). Expect substantial precipitation, totaling 223 mm (8.8 in) over approximately 19 days. Additionally, the environment is characterized by a high average humidity of 89%, making for a uniquely lush atmosphere.

September Temperature in Shiozawa

In September in Shiozawa, the average temperature is 19°C (67°F), with maximums reaching 31°C (89°F) and minimums dropping to as low as 6°C (43°F). Be prepared for a pleasant mix of warm days and cooler nights while traveling during this time.

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

The chart illustrates September temperature patterns in Shiozawa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Shiozawa, September typically has an average temperature of 19°C (67°F), with highs reaching up to 31°C (89°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec272837465864727566564432
Data source: Temperature data for Shiozawa 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 Shiozawa

In Shiozawa in September, the total precipitation amount is 223 mm (8.8 in), which occurs over the course of 19 days.

September Precipitation Trends in Shiozawa

The chart displays monthly precipitation patterns in Shiozawa, 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 Shiozawa, September typically receives around 223 mm (8.8 inches) of precipitation spread over approximately 19 days.
JanFebMarAprMayJunJulAugSepOctNovDec199185174167181201376238223256145226
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Shiozawa

In Shiozawa in September, humidity is 89%. With an average temperature of 19°C (67°F), this humidity feels like a warm, muggy blanket enveloping you, making outdoor activities uncomfortable and encouraging travelers to seek shaded areas or indoor attractions during the hottest parts of the day.

September Average Humidity in Shiozawa

This chart illustrates the average monthly humidity levels in Shiozawa, 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 Shiozawa 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 Shiozawa

In Shiozawa in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Shiozawa.

Maximum UV Index Levels in Shiozawa for September

The chart shows the monthly maximum UV Index (UVI) for Shiozawa 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 Shiozawa typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec4589101111119753
Data source: Shiozawa 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 Shiozawa Compares to Other Months

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

This table compares monthly weather conditions in Shiozawa, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (28°F)199 mm (7.8 inches)88%moderate
February Weather-2°C (29°F)185 mm (7.3 inches)86%moderate
March Weather3°C (37°F)174 mm (6.9 inches)81%very high
April Weather8°C (46°F)167 mm (6.6 inches)78%very high
May Weather15°C (58°F)181 mm (7.1 inches)81%very high
June Weather18°C (64°F)201 mm (7.9 inches)88%extreme
July Weather22°C (73°F)376 mm (14.8 inches)92%extreme
August Weather24°C (75°F)238 mm (9.4 inches)92%extreme
September Weather19°C (67°F)223 mm (8.8 inches)89%very high
October Weather13°C (56°F)256 mm (10.1 inches)87%high
November Weather6°C (44°F)145 mm (5.7 inches)85%moderate
December Weather0°C (32°F)226 mm (8.9 inches)86%moderate

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