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September Weather in Semboku, Japan

Last updated: August 23, 2025

In September, the average temperature in Semboku, Japan is a comfortable 18°C (65°F), with daily variations ranging from a cool 4°C (40°F) to a warm 30°C (87°F). Expect 170 mm (6.7 in) of precipitation spread over 16 days, contributing to an average humidity of 86%. Prepare for a delightful, if slightly damp, experience in this beautiful destination!

September Temperature in Semboku

In September in Semboku, the average temperature is 18°C (65°F). The maximum can reach 30°C (87°F), and the minimum can be as low as 4°C (40°F). It’s a great time to explore Semboku while enjoying mild weather and some warm days.

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

The chart illustrates September temperature patterns in Semboku, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Semboku, September typically has an average temperature of 18°C (65°F), with highs reaching up to 30°C (87°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec252634445663717264534129
Data source: Temperature data for Semboku 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 Semboku

In Semboku in September, the total precipitation amount is 170 mm (6.7 in) spread over 16 days.

September Precipitation Trends in Semboku

The chart displays monthly precipitation patterns in Semboku, 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 Semboku, September typically receives around 170 mm (6.7 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec105140141170160182237238170179134153
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Semboku

In Semboku 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 Semboku

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

In Semboku 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 Semboku.

Maximum UV Index Levels in Semboku for September

The chart shows the monthly maximum UV Index (UVI) for Semboku 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 Semboku typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346991010119643
Data source: Semboku 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 Semboku Compares to Other Months

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

This table compares monthly weather conditions in Semboku, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)105 mm (4.1 inches)80%moderate
February Weather-3°C (26°F)140 mm (5.5 inches)79%moderate
March Weather1°C (34°F)141 mm (5.6 inches)77%high
April Weather6°C (44°F)170 mm (6.7 inches)75%very high
May Weather13°C (56°F)160 mm (6.3 inches)80%very high
June Weather17°C (63°F)182 mm (7.2 inches)87%very high
July Weather21°C (71°F)237 mm (9.3 inches)92%very high
August Weather22°C (73°F)238 mm (9.4 inches)92%extreme
September Weather18°C (65°F)170 mm (6.7 inches)86%very high
October Weather12°C (54°F)179 mm (7.1 inches)82%high
November Weather5°C (42°F)134 mm (5.3 inches)79%moderate
December Weather-1°C (30°F)153 mm (6.0 inches)80%moderate

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