October weather forecast
Hiroshima, Japan

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Weather in October

October's weather in Hiroshima is notably cooler than September with temperatures reflecting strong autumnal vibes. A significant drop in rainfall, down to 88mm (3.46"), makes October a drier month compared to the preceding monsoon months. Daylight shrinks further than earlier in the year, marking the progress of autumn. Despite the shorter daylight hours, a fair amount of sunshine persists adding to the charm of autumn in Hiroshima. The UV index lowers even more, providing a pleasant atmosphere for outdoor activities without the worry of strong sun exposure.

Temperature

The onset of October in Hiroshima, Japan, comes with a shift in the average high-temperature, falling from a moderately hot 29°C (84.2°F) in September to a still warm 23.4°C (74.1°F). During October, Hiroshima experiences a consistent low-temperature average of 14.2°C (57.6°F).

Humidity

The average relative humidity in October in Hiroshima is 68%.

Rainfall

In October, the rain falls for 12 days. Throughout October, 88mm (3.46") of precipitation is accumulated. In Hiroshima, during the entire year, the rain falls for 190 days and collects up to 1538mm (60.55") of precipitation.

Snowfall

In Hiroshima, snow does not fall in April through November.

Sea temperature

In October, the average sea temperature is 23.2°C (73.8°F).
Note: If someone is sensitive to cold, the enjoyment of swimming in 23.2°C (73.8°F) water hinges on factors like sunshine, wind, and the current air temperature. (For context: Olympic swimming competitions are held in water temperatures of 25°C (77°F) to 28°C (82.4°F).)

Daylight

The average length of the day in October is 11h and 20min.
On the first day of October, sunrise is at 06:04 and sunset at 17:54. On the last day of the month, sunrise is at 06:29 and sunset at 17:18 JST.

Sunshine

In Hiroshima, the average sunshine in October is 5.9h.

UV index

In October, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: The maximum daily UV index of 6 during October translates into the following directions:
Uphold preventive measures and conform to sun safety guidelines. Defending against skin and eye harm is crucial. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Take caution! The UV rays from the Sun gain strength from sand and water reflections.

Frequently asked questions

What is the average October temperature in Hiroshima?

The high-temperature, in October, in Hiroshima, is 23.4°C (74.1°F), while the low-temperature averages to 14.2°C (57.6°F). In September, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which factors the actual air temperature with the relative humidity, is appraised at 33°C (91.4°F).

What is the average humidity in October in Hiroshima?

In Hiroshima, Japan, the average relative humidity in October is 68%.

How much does it rain in Hiroshima in October?

In Hiroshima, during October, the rain falls for 12 days and regularly aggregates up to 88mm (3.46") of precipitation.

When it does not snow in Hiroshima?

April through November are months without snowfall in Hiroshima.

What is the water temperature in October in Hiroshima?

In Hiroshima, Japan, the average seawater temperature in October is 23.2°C (73.8°F). Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 23.2°C (73.8°F) water may be enjoyable.

What is the average length of the day in October in Hiroshima?

In October, the average day length is 11h and 20min.

When is the sunrise / sunset in October in Hiroshima?

On the first day of October, sunrise is at 06:04 and sunset at 17:54. On the last day of the month, sunrise is at 06:29 and sunset at 17:18 JST.

How long on average sun shines in October in Hiroshima?

The average sunshine duration in October in Hiroshima is 5.9h.

What is the UV index intensity in October in Hiroshima?

The average daily maximum UV index in October in Hiroshima, Japan, is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average UV index

Average temperature in October
Hiroshima, Japan

Average temperature in October - Hiroshima, Japan
  • Average high temperature in October: 23.4°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 October: 14.2°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 October
Hiroshima, Japan

Average humidity in October - Hiroshima, Japan
  • Average humidity in October: 68%

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

Average rainfall in October
Hiroshima, Japan

Average rainfall in October - Hiroshima, Japan
  • Average rainfall in October: 87.9mm

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 October
Hiroshima, Japan

Average rainfall days in October - Hiroshima, Japan
  • Average rainfall days in October: 12 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 October
Hiroshima, Japan

Average snowfall in October - Hiroshima, Japan
  • Average snowfall in October: 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 October
Hiroshima, Japan

Average snowfall days in October - Hiroshima, Japan
  • Average snowfall days in October: 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 October
Hiroshima, Japan

Average sea temperature in October - Hiroshima, Japan
  • Average sea temperature in October: 23.2°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 October /
Average sunshine in October
Hiroshima, Japan

Average daylight in October / Average sunshine in October - Hiroshima, Japan
  • Average daylight in October: 11h and 2min

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 October: 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 October
Hiroshima, Japan

Average UV index in October - Hiroshima, Japan
  • Average UV index in October: 6

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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