August Weather in Isumi, Japan

Last updated: August 23, 2025

In Isumi, Japan, the average temperature in August hovers around 27°C (81°F), with minimums dipping to 22°C (72°F) and maximums reaching up to 31°C (89°F). Expect an average precipitation of 113 mm (4.5 in) spread across 13 days, and be prepared for a high humidity level of 87%. Stay cool and enjoy the tropical vibes!

August Temperature in Isumi

In August in Isumi, the average temperature is 27°C (81°F). The maximum can reach 31°C (89°F) and the minimum can be as low as 22°C (72°F). This pleasant climate makes it an ideal time for outdoor activities and sightseeing.

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

The chart illustrates August 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, August typically has an average temperature of 27°C (81°F), with highs reaching up to 31°C (89°F) and lows dropping to around 22°C (72°F).

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

August Precipitation in Isumi

In Isumi in August, the precipitation amount is 113 mm (4.5 in) accumulated over 13 days.

August Precipitation Trends in Isumi

The chart displays monthly precipitation patterns in Isumi, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Isumi, August typically receives around 113 mm (4.5 inches) of precipitation spread over approximately 13 days.

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

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Millimeters (mm) Inches (in)

August Humidity in Isumi

In Isumi in August, humidity is 87%. With an average temperature of 27°C (81°F), this humidity feels like walking through a warm, damp blanket, making traveling feel heavy and exhausting.

August Average Humidity in Isumi

This chart illustrates the average monthly humidity levels in Isumi, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Isumi is approximately 87%, offering insight into how humid the weather typically is during this month.

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

August UV Index in Isumi

In Isumi in August, 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 Isumi.

Maximum UV Index Levels in Isumi for August

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

Data source: Isumi August 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 August 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 August’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 August’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