August weather forecast
Matsuyama, Japan

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Weather in August

The weather in Matsuyama in August echoes July’s high summer conditions, but there are certain clear departures as well. The temperatures endure at a high 29.2°C (84.6°F), making it the hottest month of the year. With rainfall lessening to 68mm (2.68") over 20.3 days, August continues with fewer showers when compared to the prior month. Despite the high temperatures, the month manages to maintain a decent amount of sunshine lasting up to 10.8 hours per day. This month, synonymous with hot summer days and warm nights, slowly prepares the city for the impending seasonal transition.

Temperature

Matsuyama's warmest month, August, registers temperatures that range from a high of 29.2°C (84.6°F) to a low of 23.4°C (74.1°F).

Heat index

The heat index value during August is calculated to be a torrid 35°C (95°F). More protective measures are required - heat exhaustion and heat cramps are likely. Heatstroke may follow lengthy activity.
When considering the heat index, it's pivotal to note it is for shade and mild wind conditions. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. This effect is personal, shaped by the individual's physical activity and heat sensitivity, influenced by factors including wind, clothing, and metabolic variances. Direct sunlight exposure should be noted as it has the potential to increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Kids are usually more vulnerable than adults, given their lesser sweating ability. Along with their larger skin surface relative to their small stature and the excess heat due to their activity, their risk is amplified.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. Relative humidity in excess curtails evaporation, therefore reducing heat dissipation from the body, leading to feelings of excess heat. Excessive heat that's not properly managed leads to increased body temperatures and resultant health issues.

Humidity

The average relative humidity in August in Matsuyama is 80%.

Rainfall

In August, in Matsuyama, the rain falls for 20.3 days. Throughout August, 68mm (2.68") of precipitation is accumulated. Throughout the year, in Matsuyama, there are 162.8 rainfall days, and 749mm (29.49") of precipitation is accumulated.

Snowfall

In Matsuyama, snow does not fall in March through November.

Sea temperature

August is the month with the warmest seawater in Matsuyama, with an average sea temperature of 27.2°C (81°F).
Note: For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

In August, the average length of the day is 13h and 23min.
On the first day of August in Matsuyama, sunrise is at 05:20 and sunset at 19:09. On the last day of the month, sunrise is at 05:42 and sunset at 18:36 JST.

Sunshine

With an average of 10.8h of sunshine, August has the most sunshine of the year in Matsuyama, Japan.

UV index

In August, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: The daily high UV index of 6 during August translates into the following recommendations:
Employ safeguards and advocate sun safety protocols. Shielding against skin and eye damage is crucial. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Be alert! The reflection of water and sand augments UV radiation intensity.
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Frequently asked questions

What time of the year is the hottest in Matsuyama?

August temperatures in Matsuyama tend to peak at an average high of 29.2°C (84.6°F) and dip to a low of 23.4°C (74.1°F).

How hot does it get in Matsuyama in August?

The average high-temperature, in August, in Matsuyama, is 29.2°C (84.6°F), while the average low-temperature is 23.4°C (74.1°F). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which represents the influence of relative humidity on air temperature, in August is calculated to be 35°C (95°F).

What is the average humidity in August in Matsuyama?

In Matsuyama, Japan, the average relative humidity in August is 80%.

How much does it rain in Matsuyama in August?

In Matsuyama, Japan, in August, during 20.3 rainfall days, 68mm (2.68") of precipitation is typically accumulated.

When it does not snow in Matsuyama?

March through November are months without snowfall in Matsuyama.

When is the sea warmest in Matsuyama?

The month with the warmest seawater is August, with an average sea temperature of 27.2°C (81°F).

How warm is the water in August in Matsuyama?

In Matsuyama, in August, the average water temperature is 27.2°C (81°F). For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

What is the average length of the day in August in Matsuyama?

The average day length in August is 13h and 23min.

When are sunrise and sunset in August in Matsuyama?

On the first day of August in Matsuyama, Japan, sunrise is at 05:20 and sunset at 19:09. On the last day of the month, sunrise is at 05:42 and sunset at 18:36 JST.

What month has the most sunshine in Matsuyama?

With an average of 10.8h of sunshine, August has the most sunshine of the year in Matsuyama.

How many hours of sunshine does Matsuyama have in August?

The average sunshine duration in August in Matsuyama, Japan, is 10.8h.

What is the UV index intensity in August in Matsuyama?

In Matsuyama, the average daily maximum UV index in August is 6. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover

Average temperature in August
Matsuyama, Japan

Average temperature in August - Matsuyama, Japan
  • Average high temperature in August: 29.2°C

The warmest month (with the highest average high temperature) is August (29.2°C).
The month with the lowest average high temperature is January (8°C).

  • Average low temperature in August: 23.4°C

The month with the highest average low temperature is August (23.4°C).
The coldest month (with the lowest average low temperature) is January (2.9°C).

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Average pressure in August
Matsuyama, Japan

Average pressure in August - Matsuyama, Japan
  • Average pressure in August: 1009.1mbar

The month with the highest atmospheric pressure is January (1021mbar).
The month with the lowest atmospheric pressure is June (1008.4mbar).

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Average wind speed in August
Matsuyama, Japan

Average wind speed in August - Matsuyama, Japan
  • Average wind speed in August: 6.9km/h

The windiest month (with the highest average wind speed) is January (12.2km/h).
The calmest month (with the lowest average wind speed) is June (6.6km/h).

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Average humidity in August
Matsuyama, Japan

Average humidity in August - Matsuyama, Japan
  • Average humidity in August: 80%

The month with the highest relative humidity is July (84%).
The months with the lowest relative humidity are January, February and March (72%).

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Average rainfall in August
Matsuyama, Japan

Average rainfall in August - Matsuyama, Japan
  • Average rainfall in August: 68mm

The wettest month (with the highest rainfall) is June (149mm).
The driest month (with the least rainfall) is January (24mm).

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Average rainfall days in August
Matsuyama, Japan

Average rainfall days in August - Matsuyama, Japan
  • Average rainfall days in August: 20.3 days

The month with the highest number of rainy days is July (21.3 days).
The month with the least rainy days is January (8.3 days).

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Average snowfall in August
Matsuyama, Japan

Average snowfall in August - Matsuyama, Japan
  • Average snowfall in August: 0mm

The month with the highest snowfall is December (6mm).
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0mm).

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Average snowfall days in August
Matsuyama, Japan

Average snowfall days in August - Matsuyama, Japan
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (1.3 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).

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Average sea temperature in August
Matsuyama, Japan

Average sea temperature in August - Matsuyama, Japan
  • Average sea temperature in August: 27.2°C

The best month for swimming (with the highest average sea temperature) is August (27.2°C).
The coldest month (with the lowest average sea temperature) is February (14.7°C).

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Average daylight in August /
Average sunshine in August
Matsuyama, Japan

Average daylight in August / Average sunshine in August - Matsuyama, Japan
  • Average daylight in August: 13h 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: 10h and 0min).

  • Average sunshine in August: 10h and 5min

The month with the most sunshine is August (Average sunshine: 10h and 48min).
The month with the least sunshine is January (Average sunshine: 5h and 12min).

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Average sunshine days in August
Matsuyama, Japan

Average sunshine days in August - Matsuyama, Japan
  • Average sunshine days in August: 6.4 days

The month with the most sunshine days is January (20.3 days).
The month with the least sunshine days is August (6.4 days).

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Average UV index in August
Matsuyama, Japan

Average UV index in August - Matsuyama, Japan
  • Average UV index in August: 6

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January and December (UV index 2).

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Average cloud cover in August
Matsuyama, Japan

Average cloud cover in August - Matsuyama, Japan
  • Average cloud cover in August: 30

The month with the most cloud cover is January (Cloud cover 43).
The month with the least cloud cover is August (Cloud cover 30).

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Average visibility in August
Matsuyama, Japan

Average visibility in August - Matsuyama, Japan
  • Average visibility in August: 10km

The months with the highest visibility are January, February, March, August, September, October, November and December (10km).
The months with the lowest visibility are April, May, June and July (9km).

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Matsuyama, Japan

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