July weather forecast
Hiroshima, Japan

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Weather in July

July in Hiroshima brings the year's highest temperature, soaring to 30.8°C (87.4°F), offering a hot, summer environment during the peak travel season. As the rainfall continues at a high pace, the high humidity intensifies the perceived heat. Despite the monsoon-like conditions, Hiroshima endures significant sunshine hours, creating a steamy atmosphere. Nights also stay warm, offering little respite from the day's heat. The sea temperature begins to climb, making it an ideal time for water sports and beach activities.

Temperature

A soft shift in the average high-temperature is noticeable in July, transitioning from a moderately hot 27.2°C (81°F) in June to a hot 30.8°C (87.4°F). The temperature in Hiroshima dips to an average of 23.8°C (74.8°F) during July nights.

Heat index

For July, the heat index is appraised at a torrid 38°C (100.4°F). Undertake additional safety actions, risk of heat cramps and heat exhaustion is significant. Persistent activity may induce heatstroke.
Heat index specifics point out values are for conditions of shade and a slight breeze. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a metric representing the sensation of warmth when air temperature and moisture come together. Additional elements encompassing metabolic differences, the degree of physical activity, and attire can impact the individual's perception of temperature. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Younglings frequently fail to recognize the requirement to rest and rehydrate. Thirst emerges late in dehydration - it is imperative to keep hydration levels high, particularly during extended physical exertions.
To achieve cooling, the human body employs perspiration, relying on the subsequent evaporation of sweat. In situations of high air temperature combined with high humidity (significant heat index), the body's ability to perspire is reduced, heightening the sense of warmth. Excessive heat that's not properly managed leads to increased body temperatures and resultant health issues.

Humidity

The most humid month in Hiroshima is July, with an average relative humidity of 74%.

Rainfall

The month with the most rainfall in Hiroshima is July, when the rain falls for 17 days and typically aggregates up to 259mm (10.2") of precipitation.

Snowfall

April through November are months without snowfall in Hiroshima.

Sea temperature

In Hiroshima, the average seawater temperature in July is 24.6°C (76.3°F).
Note: Imagine a swim in 24.6°C (76.3°F) waters. How you'd feel depends on your cold sensitivity, the sun's rays, the caress of the wind, and the warmth enveloping you. Comparatively, Olympic swimmers train in waters between 25°C (77°F) and 28°C (82.4°F).

Daylight

In Hiroshima, the average length of the day in July is 14h and 12min.
On the first day of the month, sunrise is at 05:01 and sunset at 19:26. On the last day of July, in Hiroshima, sunrise is at 05:20 and sunset at 19:12 JST.

Sunshine

In Hiroshima, the average sunshine in July is 5.8h.

UV index

July is the month with the highest UV index in Hiroshima, with an average maximum UV index of 11. A UV Index estimate of 11, and higher, represents an excessive health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The daily high UV index of 11 during July translates into the following recommendations:
Carry out all crucial safety measures, unprotected skin may burn instantly. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. Enhance your sun protection with tightly woven, yet airy clothing. Even if the day is cloudy, sunscreen with SPF of at least 30 should be applied generously and reapplied often, particularly after swimming or outdoor exercise. Stay vigilant! UV rays get a boost in intensity due to sand and water reflections.

Frequently asked questions

How hot is it in Hiroshima in July?

In Hiroshima, 30.8°C (87.4°F) is the average high-temperature and 23.8°C (74.8°F) is the average low-temperature during July. The average heat index (a.k.a. 'feels like', 'real feel'), which factors the actual air temperature with the relative humidity, in July is appraised at 38°C (100.4°F).

What is the most humid month in Hiroshima?

July is the most humid month in Hiroshima, with an average relative humidity of 74%.

What is the average humidity in July in Hiroshima?

The average relative humidity in July is 74%.

What is the rainiest month in Hiroshima?

July is the month with the most rainfall in Hiroshima. Rain falls for 17 days and accumulates 259mm (10.2") of precipitation.

How many days does it rain in July in Hiroshima?

In July, in Hiroshima, Japan, the rain falls for 17 days. Throughout July, 259mm (10.2") of precipitation is accumulated.

When it does not snow in Hiroshima?

April through November are months without snowfall.

How warm is the water in July in Hiroshima?

In Hiroshima, Japan, in July, the average water temperature is 24.6°C (76.3°F). A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 24.6°C (76.3°F) water.

How many hours of daylight does Hiroshima have in July?

The average day length in July in Hiroshima, Japan, is 14h and 12min.

What time are sunrise and sunset in July in Hiroshima?

On the first day of July, sunrise is at 05:01 and sunset at 19:26. On the last day of the month, sunrise is at 05:20 and sunset at 19:12 JST.

How many hours of sunshine does Hiroshima have in July?

In Hiroshima, the average sunshine duration in July is 5.8h.

When is the highest UV index in Hiroshima?

The month with the highest UV index is July, with an average maximum UV index of 11.

What is the UV index reading in July in Hiroshima?

In July, the average daily maximum UV index is 11. A UV Index of 11, and more, symbolizes an extreme health vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average UV index

Average temperature in July
Hiroshima, Japan

Average temperature in July - Hiroshima, Japan
  • Average high temperature in July: 30.8°C

The warmest month (with the highest average high temperature) is August (32.5°C).
The month with the lowest average high temperature is January (9.7°C).

  • Average low temperature in July: 23.8°C

The month with the highest average low temperature is August (24.8°C).
The coldest month (with the lowest average low temperature) is January (1.7°C).

Average humidity in July
Hiroshima, Japan

Average humidity in July - Hiroshima, Japan
  • Average humidity in July: 74%

The month with the highest relative humidity is July (74%).
The month with the lowest relative humidity is April (63%).

Average rainfall in July
Hiroshima, Japan

Average rainfall in July - Hiroshima, Japan
  • Average rainfall in July: 258.6mm

The wettest month (with the highest rainfall) is July (258.6mm).
The driest month (with the least rainfall) is December (41.2mm).

Average rainfall days in July
Hiroshima, Japan

Average rainfall days in July - Hiroshima, Japan
  • Average rainfall days in July: 17 days

The month with the highest number of rainy days is January (19 days).
The month with the least rainy days is October (12 days).

Average snowfall in July
Hiroshima, Japan

Average snowfall in July - Hiroshima, Japan
  • Average snowfall in July: 0mm

The month with the highest snowfall is January (50mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).

Average snowfall days in July
Hiroshima, Japan

Average snowfall days in July - Hiroshima, Japan
  • Average snowfall days in July: 0 days

The month with the highest number of snowfall days is January (8.7 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

Average sea temperature in July
Hiroshima, Japan

Average sea temperature in July - Hiroshima, Japan
  • Average sea temperature in July: 24.6°C

The best month for swimming (with the highest average sea temperature) is August (26.8°C).
The coldest month (with the lowest average sea temperature) is February (12.4°C).

Average daylight in July /
Average sunshine in July
Hiroshima, Japan

Average daylight in July / Average sunshine in July - Hiroshima, Japan
  • Average daylight in July: 14h and 1min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in July: 5h and 5min

The month with the most sunshine is August (Average sunshine: 6h and 48min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).

Average UV index in July
Hiroshima, Japan

Average UV index in July - Hiroshima, Japan
  • Average UV index in July: 11

The month with the highest UV index is July (UV index 11).
The months with the lowest UV index are January and December (UV index 3).

Hiroshima, Japan

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