September Weather in Hamatonbetsu, Japan

Last updated: August 23, 2025

In September, the average temperature in Hamatonbetsu, Japan hovers around 17°C (63°F), with potential lows of 11°C (53°F) and highs reaching 25°C (78°F). Expect 76 mm (3.0 in) of precipitation spread over approximately 10 days, contributing to a notably high average humidity of 86%.

September Temperature in Hamatonbetsu

In September in Hamatonbetsu, the average temperature is 17°C (63°F). Maximums can reach 25°C (78°F), while minimums can drop to as low as 11°C (53°F). It’s a perfect time to explore the outdoors while enjoying mild weather.

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

The chart illustrates September temperature patterns in Hamatonbetsu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hamatonbetsu, September typically has an average temperature of 17°C (63°F), with highs reaching up to 25°C (78°F) and lows dropping to around 11°C (53°F).

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

September Precipitation in Hamatonbetsu

In Hamatonbetsu in September, the total precipitation amount is 76 mm (3.0 in) spread over a period of 10 days.

September Precipitation Trends in Hamatonbetsu

The chart displays monthly precipitation patterns in Hamatonbetsu, 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 Hamatonbetsu, September typically receives around 76 mm (3.0 inches) of precipitation spread over approximately 10 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 Hamatonbetsu

In Hamatonbetsu in September humidity is 86%. With an average temperature of 17°C (63°F), this humidity feels like a heavy blanket wrapping around you, making the air feel thick and slightly stifling for traveling, as every step requires more effort and even a gentle breeze feels refreshing amidst the muggy atmosphere.

September Average Humidity in Hamatonbetsu

This chart illustrates the average monthly humidity levels in Hamatonbetsu, 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 Hamatonbetsu is approximately 86%, 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 Hamatonbetsu

In Hamatonbetsu in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Hamatonbetsu.

Maximum UV Index Levels in Hamatonbetsu for September

The chart shows the monthly maximum UV Index (UVI) for Hamatonbetsu 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 Hamatonbetsu typically reaches 7, which falls under the high exposure category.

Data source: Hamatonbetsu 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 Hamatonbetsu Compares to Other Months

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

This table compares monthly weather conditions in Hamatonbetsu, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (25°F)	71 mm (2.8 inches)	87%	low
February Weather	-5°C (23°F)	55 mm (2.2 inches)	84%	moderate
March Weather	-1°C (31°F)	70 mm (2.7 inches)	83%	moderate
April Weather	4°C (39°F)	56 mm (2.2 inches)	84%	high
May Weather	8°C (46°F)	83 mm (3.3 inches)	88%	very high
June Weather	11°C (52°F)	92 mm (3.6 inches)	88%	very high
July Weather	16°C (61°F)	100 mm (3.9 inches)	93%	very high
August Weather	18°C (65°F)	164 mm (6.5 inches)	94%	very high
September Weather	17°C (63°F)	76 mm (3.0 inches)	86%	high
October Weather	12°C (54°F)	126 mm (5.0 inches)	79%	moderate
November Weather	5°C (41°F)	136 mm (5.4 inches)	77%	moderate
December Weather	-1°C (30°F)	129 mm (5.1 inches)	83%	low