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September Weather in Iwaizumi, Japan

Last updated: August 23, 2025

In September, the average temperature in Iwaizumi, Japan hovers around 18°C (65°F), with a comfortable range between a minimum of 7°C (44°F) and a maximum of 29°C (85°F). Expect significant precipitation of about 157 mm (6.2 in) spread over 14 days, contributing to a high average humidity of 86%. So, be prepared for a mix of warmth and moisture during your visit!

September Temperature in Iwaizumi

In September in Iwaizumi, the average temperature is 18°C (65°F), with maximums reaching 29°C (85°F) and minimums dropping as low as 7°C (44°F). This pleasant climate makes it an ideal time for travelers to explore and enjoy outdoor activities.

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

The chart illustrates September temperature patterns in Iwaizumi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Iwaizumi, September typically has an average temperature of 18°C (65°F), with highs reaching up to 29°C (85°F) and lows dropping to around 7°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec282837445561697164544433
Data source: Temperature data for Iwaizumi 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 Iwaizumi

In Iwaizumi in September, the precipitation amount is 157 mm (6.2 in) spread over a duration of 14 days.

September Precipitation Trends in Iwaizumi

The chart displays monthly precipitation patterns in Iwaizumi, 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 Iwaizumi, September typically receives around 157 mm (6.2 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec49671021191061081781991572004563
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Iwaizumi

In Iwaizumi in September humidity is 86%. With an average temperature of 18°C (65°F), this humidity feels like you’re wrapped in a warm, heavy blanket, making outdoor activities feel quite muggy and sticky for traveling.

September Average Humidity in Iwaizumi

This chart illustrates the average monthly humidity levels in Iwaizumi, 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 Iwaizumi is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%79%77%75%80%87%92%92%86%82%79%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Iwaizumi

In Iwaizumi 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 Iwaizumi.

Maximum UV Index Levels in Iwaizumi for September

The chart shows the monthly maximum UV Index (UVI) for Iwaizumi 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 Iwaizumi typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346991110119643
Data source: Iwaizumi 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 Iwaizumi Compares to Other Months

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

This table compares monthly weather conditions in Iwaizumi, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)49 mm (1.9 inches)80%moderate
February Weather-2°C (29°F)67 mm (2.6 inches)79%moderate
March Weather3°C (37°F)102 mm (4.0 inches)77%high
April Weather7°C (45°F)119 mm (4.7 inches)75%very high
May Weather13°C (55°F)106 mm (4.2 inches)80%very high
June Weather16°C (61°F)108 mm (4.3 inches)87%extreme
July Weather20°C (69°F)178 mm (7.0 inches)92%very high
August Weather22°C (71°F)199 mm (7.8 inches)92%extreme
September Weather18°C (65°F)157 mm (6.2 inches)86%very high
October Weather12°C (55°F)200 mm (7.9 inches)82%high
November Weather6°C (44°F)45 mm (1.8 inches)79%moderate
December Weather0°C (33°F)63 mm (2.5 inches)80%moderate

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