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September Weather in Shiroishi, Japan

Last updated: August 23, 2025

In Shiroishi, Japan, the average temperature in September is a pleasant 20°C (68°F). However, temperatures can vary widely, with minimums dipping to 7°C (45°F) and maximums soaring to 34°C (93°F). Expect about 140 mm (5.5 in) of precipitation spread over 14 days, contributing to an average humidity of 84%. Always be prepared for shifting weather patterns during your visit!

September Temperature in Shiroishi

In September in Shiroishi, the average temperature is 20°C (68°F). Maximum temperatures can reach 34°C (93°F), while minimums can drop as low as 7°C (45°F). Be prepared for a range of temperatures to ensure a comfortable and enjoyable travel experience.

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

The chart illustrates September temperature patterns in Shiroishi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Shiroishi, September typically has an average temperature of 20°C (68°F), with highs reaching up to 34°C (93°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec313241496066737668574636
Data source: Temperature data for Shiroishi 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 Shiroishi

In Shiroishi in September, the precipitation amount is 140 mm (5.5 in) over the course of 14 days.

September Precipitation Trends in Shiroishi

The chart displays monthly precipitation patterns in Shiroishi, 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 Shiroishi, September typically receives around 140 mm (5.5 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec79691121091061002451831401944687
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Shiroishi

In Shiroishi in September humidity is 84%. With an average temperature of 20°C (68°F), this humidity feels like a warm, enveloping blanket, making travel a challenge as the air clings to your skin, and every step feels heavier in the mugginess.

September Average Humidity in Shiroishi

This chart illustrates the average monthly humidity levels in Shiroishi, 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 Shiroishi is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%75%72%73%80%87%93%90%84%80%77%77%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Shiroishi

In Shiroishi 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 Shiroishi.

Maximum UV Index Levels in Shiroishi for September

The chart shows the monthly maximum UV Index (UVI) for Shiroishi 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 Shiroishi typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101011119643
Data source: Shiroishi 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 Shiroishi Compares to Other Months

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

This table compares monthly weather conditions in Shiroishi, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)79 mm (3.1 inches)76%moderate
February Weather0°C (33°F)69 mm (2.7 inches)75%moderate
March Weather5°C (41°F)112 mm (4.4 inches)72%high
April Weather9°C (49°F)109 mm (4.3 inches)73%very high
May Weather16°C (60°F)106 mm (4.2 inches)80%very high
June Weather19°C (66°F)100 mm (3.9 inches)87%very high
July Weather23°C (74°F)245 mm (9.6 inches)92%extreme
August Weather24°C (76°F)183 mm (7.2 inches)90%extreme
September Weather20°C (68°F)140 mm (5.5 inches)84%very high
October Weather14°C (58°F)194 mm (7.6 inches)80%high
November Weather8°C (47°F)46 mm (1.8 inches)77%moderate
December Weather2°C (36°F)87 mm (3.4 inches)77%moderate

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