September Weather in Niimi, Japan

Last updated: August 23, 2025

In September, the average temperature in Niimi, Japan is a pleasant 22°C (71°F), with temperatures ranging from a minimum of 11°C (52°F) to a maximum of 32°C (90°F). Expect 229 mm (9.0 in) of precipitation spread over 14 days, contributing to an average humidity of 87%. Plan your visit accordingly to enjoy the best of what this destination has to offer!

September Temperature in Niimi

In September in Niimi, the average temperature is 22°C (71°F). Maximums can reach 32°C (90°F) and minimums can be as low as 11°C (52°F). This makes it an ideal time for travelers to enjoy a pleasant climate while exploring the diverse attractions of Niimi.

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

The chart illustrates September temperature patterns in Niimi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Niimi, September typically has an average temperature of 22°C (71°F), with highs reaching up to 32°C (90°F) and lows dropping to around 11°C (52°F).

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

September Precipitation in Niimi

In Niimi in September, the total precipitation amount is 229 mm (9.0 in), spread over a period of 14 days.

September Precipitation Trends in Niimi

The chart displays monthly precipitation patterns in Niimi, 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 Niimi, September typically receives around 229 mm (9.0 inches) of precipitation spread over approximately 14 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 Niimi

In Niimi in September, humidity is 87%. With an average temperature of 22°C (71°F), this humidity feels like a warm, enveloping blanket that can drain your energy quickly, making outdoor activities feel heavier and less refreshing for traveling.

September Average Humidity in Niimi

This chart illustrates the average monthly humidity levels in Niimi, 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 Niimi is approximately 87%, 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 Niimi

In Niimi 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 Niimi.

Maximum UV Index Levels in Niimi for September

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

Data source: Niimi 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 Niimi Compares to Other Months

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

This table compares monthly weather conditions in Niimi, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (37°F)	52 mm (2.1 inches)	82%	moderate
February Weather	3°C (38°F)	59 mm (2.3 inches)	79%	high
March Weather	8°C (46°F)	116 mm (4.5 inches)	73%	very high
April Weather	12°C (54°F)	127 mm (5.0 inches)	74%	very high
May Weather	17°C (63°F)	115 mm (4.5 inches)	84%	extreme
June Weather	21°C (69°F)	186 mm (7.3 inches)	86%	extreme
July Weather	25°C (77°F)	356 mm (14.0 inches)	92%	extreme
August Weather	26°C (79°F)	242 mm (9.5 inches)	92%	extreme
September Weather	22°C (71°F)	229 mm (9.0 inches)	87%	very high
October Weather	16°C (61°F)	181 mm (7.1 inches)	85%	high
November Weather	10°C (50°F)	37 mm (1.5 inches)	84%	moderate
December Weather	4°C (40°F)	62 mm (2.4 inches)	82%	moderate