October Weather in Seiyo, Japan

Last updated: August 23, 2025

In October, the average temperature in Seiyo, Japan hovers around 18°C (64°F), with a minimum of 4°C (40°F) and a comfortable maximum of 29°C (85°F). Expect about 213 mm (8.4 in) of precipitation over 11 days, contributing to a high average humidity of 82%.

October Temperature in Seiyo

In October in Seiyo, the average temperature is 18°C (64°F). Maximums can reach 29°C (85°F), and minimums can be as low as 4°C (40°F). It's a great time for travelers to enjoy mild weather while exploring the area's attractions.

October Weather in Seiyo: Daily Temperature Highs, Lows, and Averages

The chart illustrates October temperature patterns in Seiyo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Seiyo, October typically has an average temperature of 18°C (64°F), with highs reaching up to 29°C (85°F) and lows dropping to around 4°C (40°F).

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

October Precipitation in Seiyo

In Seiyo in October, the total precipitation amount is 213 mm (8.4 in) across 11 days.

October Precipitation Trends in Seiyo

The chart displays monthly precipitation patterns in Seiyo, with values for each month alongside October’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October’s conditions compare to those of other months. In Seiyo, October typically receives around 213 mm (8.4 inches) of precipitation spread over approximately 11 days.

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

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Millimeters (mm) Inches (in)

October Humidity in Seiyo

In Seiyo in October humidity is 82%. With an average temperature of 18°C (64°F), this humidity feels like a warm, muggy embrace that can make exploring the area feel stifling, leaving travelers drenched in sweat and longing for respite in the shade.

October Average Humidity in Seiyo

This chart illustrates the average monthly humidity levels in Seiyo, with October’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In October, average humidity in Seiyo is approximately 82%, offering insight into how humid the weather typically is during this month.

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

October UV Index in Seiyo

In Seiyo in October, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Seiyo.

Maximum UV Index Levels in Seiyo for October

The chart shows the monthly maximum UV Index (UVI) for Seiyo in October, 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 October, the maximum UV index in Seiyo typically reaches 8, which falls under the very high exposure category.

Data source: Seiyo October 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 October Weather in Seiyo Compares to Other Months

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

This table compares monthly weather conditions in Seiyo, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (40°F)	60 mm (2.4 inches)	74%	moderate
February Weather	5°C (41°F)	97 mm (3.8 inches)	70%	high
March Weather	9°C (49°F)	140 mm (5.5 inches)	70%	very high
April Weather	14°C (57°F)	140 mm (5.5 inches)	76%	very high
May Weather	18°C (65°F)	174 mm (6.8 inches)	82%	extreme
June Weather	22°C (71°F)	236 mm (9.3 inches)	86%	extreme
July Weather	25°C (78°F)	409 mm (16.1 inches)	91%	extreme
August Weather	27°C (80°F)	219 mm (8.6 inches)	88%	extreme
September Weather	23°C (74°F)	229 mm (9.0 inches)	85%	extreme
October Weather	18°C (64°F)	213 mm (8.4 inches)	82%	very high
November Weather	11°C (52°F)	62 mm (2.4 inches)	79%	high
December Weather	6°C (43°F)	69 mm (2.7 inches)	77%	moderate