September Weather in Kamisu, Japan

Last updated: August 23, 2025

In Kamisu, Japan, the average temperature in September is a pleasant 24°C (75°F). You'll experience a range of temperatures with a minimum of 18°C (65°F) and a maximum of 30°C (87°F). Expect some rain, as 182 mm (7.2 in) of precipitation typically falls over 16 days. The climate is quite humid, with an average humidity of 83%, making it essential to stay hydrated during your stay!

September Temperature in Kamisu

In September, in Kamisu, the average temperature is 24°C (75°F). Maximum can reach 30°C (87°F) and minimum can be as low as 18°C (65°F). This mild climate makes it an ideal destination for travelers seeking pleasant weather and outdoor activities.

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

The chart illustrates September temperature patterns in Kamisu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kamisu, September typically has an average temperature of 24°C (75°F), with highs reaching up to 30°C (87°F) and lows dropping to around 18°C (65°F).

Data source: Temperature data for Kamisu generated using information from the Copernicus Climate Change Service.

September Precipitation in Kamisu

In Kamisu in September, the precipitation amount is 182 mm (7.2 in) over the course of 16 days.

September Precipitation Trends in Kamisu

The chart displays monthly precipitation patterns in Kamisu, 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 Kamisu, September typically receives around 182 mm (7.2 inches) of precipitation spread over approximately 16 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Kamisu

In Kamisu in September, humidity is 83%. With an average temperature of 24°C (75°F), this humidity feels like a warm blanket enveloping you, which can be quite stifling for traveling. You may find yourself frequently seeking shade or air conditioning, and it's wise to stay hydrated while exploring.

September Average Humidity in Kamisu

This chart illustrates the average monthly humidity levels in Kamisu, 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 Kamisu is approximately 83%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Kamisu

In Kamisu 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 Kamisu.

Maximum UV Index Levels in Kamisu for September

The chart shows the monthly maximum UV Index (UVI) for Kamisu 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 Kamisu typically reaches 9, which falls under the very high exposure category.

Data source: Kamisu 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 Kamisu Compares to Other Months

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

This table compares monthly weather conditions in Kamisu, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	8°C (46°F)	64 mm (2.5 inches)	70%	moderate
February Weather	8°C (47°F)	60 mm (2.4 inches)	69%	moderate
March Weather	11°C (52°F)	163 mm (6.4 inches)	68%	high
April Weather	14°C (57°F)	128 mm (5.1 inches)	73%	very high
May Weather	18°C (65°F)	152 mm (6.0 inches)	81%	extreme
June Weather	21°C (70°F)	174 mm (6.9 inches)	88%	extreme
July Weather	24°C (76°F)	196 mm (7.7 inches)	94%	extreme
August Weather	26°C (79°F)	97 mm (3.8 inches)	87%	very high
September Weather	24°C (75°F)	182 mm (7.2 inches)	83%	very high
October Weather	20°C (68°F)	279 mm (11.0 inches)	78%	high
November Weather	15°C (60°F)	127 mm (5.0 inches)	74%	moderate
December Weather	10°C (51°F)	93 mm (3.7 inches)	72%	moderate