October Weather in Isumi, Japan

Last updated: August 23, 2025

In October, the average temperature in Isumi, Japan hovers around 21°C (69°F), providing a pleasant climate for outdoor activities. Expect minimum temperatures to drop to 14°C (57°F), while highs can reach up to 27°C (81°F). However, be prepared for some rain, as the area receives an average precipitation of 292 mm (11.5 in) over 17 days. With an average humidity of 78%, the air carries a refreshing, albeit slightly moist, ambiance.

October Temperature in Isumi

In October in Isumi, the average temperature is 21°C (69°F), with maximums reaching 27°C (81°F) and minimums dipping as low as 14°C (57°F). This pleasant climate makes it an ideal time for outdoor activities and exploring the local attractions.

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

The chart illustrates October temperature patterns in Isumi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Isumi, October typically has an average temperature of 21°C (69°F), with highs reaching up to 27°C (81°F) and lows dropping to around 14°C (57°F).

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

October Precipitation in Isumi

In Isumi in October, the precipitation amount is 292 mm (11.5 in) during a total of 17 days.

October Precipitation Trends in Isumi

The chart displays monthly precipitation patterns in Isumi, 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 Isumi, October typically receives around 292 mm (11.5 inches) of precipitation spread over approximately 17 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 Isumi

In Isumi in October, humidity is 78%. With an average temperature of 21°C (69°F), this humidity feels like a warm embrace that clings to your skin, making outdoor activities feel more intense and leaving you yearning for refreshing breezes or a cool drink as you explore.

October Average Humidity in Isumi

This chart illustrates the average monthly humidity levels in Isumi, 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 Isumi is approximately 78%, 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 Isumi

In Isumi in October, 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 Isumi.

Maximum UV Index Levels in Isumi for October

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

Data source: Isumi 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 Isumi Compares to Other Months

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

This table compares monthly weather conditions in Isumi, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (48°F)	77 mm (3.0 inches)	70%	moderate
February Weather	9°C (48°F)	68 mm (2.7 inches)	69%	moderate
March Weather	12°C (54°F)	180 mm (7.1 inches)	68%	very high
April Weather	15°C (59°F)	117 mm (4.6 inches)	73%	very high
May Weather	19°C (67°F)	140 mm (5.5 inches)	81%	extreme
June Weather	22°C (72°F)	206 mm (8.1 inches)	88%	extreme
July Weather	25°C (78°F)	206 mm (8.1 inches)	94%	extreme
August Weather	27°C (81°F)	113 mm (4.5 inches)	87%	extreme
September Weather	25°C (77°F)	214 mm (8.4 inches)	83%	very high
October Weather	21°C (69°F)	292 mm (11.5 inches)	78%	high
November Weather	16°C (62°F)	142 mm (5.6 inches)	74%	moderate
December Weather	11°C (53°F)	114 mm (4.5 inches)	72%	moderate