July Weather in Isumi, Japan

Last updated: August 23, 2025

In Isumi, Japan, the average temperature in July hovers around 25°C (78°F). However, temperatures can dip to a minimum of 20°C (68°F) and soar up to a maximum of 31°C (87°F). Be prepared for 206 mm (8.1 in) of precipitation spread across approximately 16 days, and experience a high average humidity of 94%.

July Temperature in Isumi

In July in Isumi, the average temperature is 25°C (78°F), with maximums reaching up to 31°C (87°F) and minimums dropping as low as 20°C (68°F). This pleasant climate makes it an ideal time for exploring and enjoying outdoor activities.

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

The chart illustrates July 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, July typically has an average temperature of 25°C (78°F), with highs reaching up to 31°C (87°F) and lows dropping to around 20°C (68°F).

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

July Precipitation in Isumi

In Isumi in July, the precipitation amount is 206 mm (8.1 in) spread over 16 days.

July Precipitation Trends in Isumi

The chart displays monthly precipitation patterns in Isumi, with values for each month alongside July’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how July’s conditions compare to those of other months. In Isumi, July typically receives around 206 mm (8.1 inches) of precipitation spread over approximately 16 days.

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

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Millimeters (mm) Inches (in)

July Humidity in Isumi

In Isumi in July humidity is 94%. With an average temperature of 25°C (78°F), this humidity feels like stepping into a warm, damp embrace, making travel challenging as the air weighs heavily, inviting sweat to bead on your skin and leaving you feeling sticky and lethargic.

July Average Humidity in Isumi

This chart illustrates the average monthly humidity levels in Isumi, with July’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In July, average humidity in Isumi is approximately 94%, offering insight into how humid the weather typically is during this month.

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

July UV Index in Isumi

In Isumi in July, 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 July

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

Data source: Isumi July 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 July 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 July’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 July’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