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September Weather in Iwase, Japan

Last updated: August 23, 2025

In Iwase, Japan, the average temperature in September reaches a comfortable 23°C (74°F). However, you can expect a temperature range where the minimum can drop to 12°C (54°F) and the maximum soars to 35°C (95°F). During this month, the area receives an average precipitation of 157 mm (6.2 in) spread over 17 days, contributing to a high average humidity of 89%.

September Temperature in Iwase

In September in Iwase, the average temperature is 23°C (74°F). The maximum can reach 35°C (95°F), and the minimum can be as low as 12°C (54°F). This makes Iwase an ideal destination for travelers looking for warm weather with a comfortable range of temperatures.

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

The chart illustrates September temperature patterns in Iwase, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Iwase, September typically has an average temperature of 23°C (74°F), with highs reaching up to 35°C (95°F) and lows dropping to around 12°C (54°F).
JanFebMarAprMayJunJulAugSepOctNovDec394149576672788274645443
Data source: Temperature data for Iwase 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 Iwase

In Iwase in September, the precipitation amount is 157 mm (6.2 in) spread over 17 days.

September Precipitation Trends in Iwase

The chart displays monthly precipitation patterns in Iwase, 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 Iwase, September typically receives around 157 mm (6.2 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec38371241121231322181141572256350
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Iwase

In Iwase in September humidity is 89%. With an average temperature of 23°C (74°F), this humidity feels like a warm, heavy blanket enveloping you, making traveling feel stifling and exhausting as you navigate the thick air.

September Average Humidity in Iwase

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

In Iwase 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 Iwase.

Maximum UV Index Levels in Iwase for September

The chart shows the monthly maximum UV Index (UVI) for Iwase 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 Iwase typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101011109653
Data source: Iwase 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 Iwase Compares to Other Months

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

This table compares monthly weather conditions in Iwase, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (39°F)38 mm (1.5 inches)88%moderate
February Weather5°C (42°F)37 mm (1.5 inches)86%moderate
March Weather9°C (49°F)124 mm (4.9 inches)81%high
April Weather14°C (57°F)112 mm (4.4 inches)78%very high
May Weather19°C (67°F)123 mm (4.8 inches)81%very high
June Weather22°C (72°F)132 mm (5.2 inches)88%very high
July Weather26°C (79°F)218 mm (8.6 inches)92%extreme
August Weather28°C (82°F)114 mm (4.5 inches)92%very high
September Weather23°C (74°F)157 mm (6.2 inches)89%very high
October Weather18°C (64°F)225 mm (8.8 inches)87%high
November Weather12°C (54°F)63 mm (2.5 inches)85%moderate
December Weather6°C (43°F)50 mm (1.9 inches)86%moderate

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