September Weather in Tachiarai, Japan

Last updated: August 23, 2025

In Tachiarai, Japan, the average temperature in September is a pleasant 24°C (76°F). Expect a refreshing minimum of 13°C (56°F) and a warm maximum reaching 35°C (96°F). However, be prepared for a fair amount of rain, with 206 mm (8.1 in) of precipitation spread over 15 days. The air is quite humid, with an average humidity level of 84%, contributing to the overall lush and vibrant atmosphere of the region.

September Temperature in Tachiarai

In September in Tachiarai, the average temperature is 24°C (76°F). Maximums can reach 35°C (96°F), and minimums can drop as low as 13°C (56°F). This makes it an ideal time for travelers to enjoy a variety of outdoor activities and pleasant weather in Tachiarai.

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

The chart illustrates September temperature patterns in Tachiarai, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tachiarai, September typically has an average temperature of 24°C (76°F), with highs reaching up to 35°C (96°F) and lows dropping to around 13°C (56°F).

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

September Precipitation in Tachiarai

In Tachiarai in September, the total precipitation amount is 206 mm (8.1 in) over the course of 15 days.

September Precipitation Trends in Tachiarai

The chart displays monthly precipitation patterns in Tachiarai, 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 Tachiarai, September typically receives around 206 mm (8.1 inches) of precipitation spread over approximately 15 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Tachiarai

In Tachiarai in September humidity is 84%. With an average temperature of 24°C (76°F), this humidity feels like a warm, damp embrace that can make outdoor activities feel sticky and uncomfortable, requiring frequent breaks in the shade and plenty of hydration for travelers.

September Average Humidity in Tachiarai

This chart illustrates the average monthly humidity levels in Tachiarai, 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 Tachiarai is approximately 84%, 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 Tachiarai

In Tachiarai in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Tachiarai.

Maximum UV Index Levels in Tachiarai for September

The chart shows the monthly maximum UV Index (UVI) for Tachiarai 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 Tachiarai typically reaches 11, which falls under the extreme exposure category.

Data source: Tachiarai 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 Tachiarai Compares to Other Months

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

This table compares monthly weather conditions in Tachiarai, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	6°C (43°F)	58 mm (2.3 inches)	75%	moderate
February Weather	7°C (45°F)	80 mm (3.1 inches)	71%	high
March Weather	11°C (52°F)	121 mm (4.8 inches)	71%	very high
April Weather	15°C (59°F)	115 mm (4.5 inches)	78%	extreme
May Weather	20°C (68°F)	163 mm (6.4 inches)	84%	extreme
June Weather	23°C (74°F)	199 mm (7.8 inches)	86%	extreme
July Weather	27°C (81°F)	367 mm (14.4 inches)	92%	extreme
August Weather	28°C (83°F)	303 mm (11.9 inches)	91%	extreme
September Weather	24°C (76°F)	206 mm (8.1 inches)	84%	extreme
October Weather	19°C (67°F)	113 mm (4.5 inches)	83%	high
November Weather	13°C (56°F)	52 mm (2.1 inches)	81%	high
December Weather	8°C (46°F)	68 mm (2.7 inches)	79%	moderate