September Weather in Hayakawa, Japan

Last updated: August 23, 2025

In September, the average temperature in Hayakawa, Japan hovers around 19°C (66°F), with a minimum dipping to 9°C (48°F) and a peak of 30°C (87°F). Expect 243 mm (9.6 in) of precipitation spread over 21 days, contributing to an average humidity of a muggy 86%. Be prepared for a blend of warmth and moisture during this month!

September Temperature in Hayakawa

In September in Hayakawa, the average temperature is 19°C (66°F). Maximums can reach 30°C (87°F), while minimums can drop as low as 9°C (48°F). This makes it an ideal time for outdoor activities and exploring the local attractions.

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

The chart illustrates September temperature patterns in Hayakawa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hayakawa, September typically has an average temperature of 19°C (66°F), with highs reaching up to 30°C (87°F) and lows dropping to around 9°C (48°F).

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

September Precipitation in Hayakawa

In Hayakawa in September, the total precipitation amount is 243 mm (9.6 in) over the course of 21 days.

September Precipitation Trends in Hayakawa

The chart displays monthly precipitation patterns in Hayakawa, 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 Hayakawa, September typically receives around 243 mm (9.6 inches) of precipitation spread over approximately 21 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 Hayakawa

In Hayakawa in September, humidity is 86%. With an average temperature of 19°C (66°F), this humidity feels like a warm blanket enveloping you, making travel slightly uncomfortable as the air feels heavy and sticking to your skin.

September Average Humidity in Hayakawa

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

In Hayakawa in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Hayakawa.

Maximum UV Index Levels in Hayakawa for September

The chart shows the monthly maximum UV Index (UVI) for Hayakawa 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 Hayakawa typically reaches 10, which falls under the very high exposure category.

Data source: Hayakawa 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 Hayakawa Compares to Other Months

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

This table compares monthly weather conditions in Hayakawa, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-1°C (30°F)	65 mm (2.6 inches)	76%	moderate
February Weather	0°C (32°F)	80 mm (3.1 inches)	74%	high
March Weather	4°C (40°F)	182 mm (7.2 inches)	70%	very high
April Weather	9°C (48°F)	179 mm (7.0 inches)	74%	very high
May Weather	14°C (57°F)	191 mm (7.5 inches)	81%	extreme
June Weather	17°C (63°F)	222 mm (8.7 inches)	88%	extreme
July Weather	21°C (70°F)	451 mm (17.8 inches)	93%	extreme
August Weather	23°C (73°F)	227 mm (8.9 inches)	90%	extreme
September Weather	19°C (66°F)	243 mm (9.6 inches)	86%	very high
October Weather	13°C (56°F)	330 mm (13.0 inches)	83%	high
November Weather	7°C (45°F)	80 mm (3.1 inches)	80%	high
December Weather	2°C (35°F)	77 mm (3.0 inches)	78%	moderate