August weather forecastJoetsu, Japan

August

Weather in August

The last month of the summer, August, is another warm month in Joetsu, Japan, with an average temperature ranging between min 20.9°C (69.6°F) and max 27.8°C (82°F).

Temperature

August brings the highest temperatures, with an average high of 27.8°C (82°F) and an average low of 20.9°C (69.6°F).

Heat index

For most parts of August, the heat index is calculated to be a tropical 32°C (89.6°F). Uninterrupted exposure and activity might result in fatigue, potentially causing heat cramps.
For clarity, heat index numbers account for light winds and areas under shade. Heat index values may be hiked up by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'feels like' or 'real feel', is a single figure representing how weather conditions feel when combining temperature and humidity. Factors including metabolic differences, physical activity, and clothing are additional elements that influence the individual's temperature experience. The sun, when shining directly, can have a significant impact on the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Kids are usually in more danger than grown-ups as they tend to sweat less. Plus, their bigger skin surface in relation to their small frames and increased heat generation due to their activity level make them more susceptible.

Humidity

The average relative humidity in August is 80%.

Rainfall

In Joetsu, during August, the rain falls for 19.4 days and regularly aggregates up to 109mm (4.29") of precipitation. In Joetsu, during the entire year, the rain falls for 200.6 days and collects up to 1190mm (46.85") of precipitation.

Snowfall

May through October are months without snowfall in Joetsu.

Sea temperature

August is the month with the warmest seawater in Joetsu, with an average sea temperature of 27°C (80.6°F).
Note: Water activities in temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are pleasurable, without feeling uncomfortable even during extended periods.

Daylight

In August, the average length of the day is 13h and 34min.
On the first day of August, sunrise is at 04:52 and sunset at 18:54. On the last day of the month, sunrise is at 05:17 and sunset at 18:17 JST.

Sunshine

With an average of 10.3h of sunshine, August has the most sunshine of the year in Joetsu, Japan.

UV index

The months with the highest UV index in Joetsu are June through August, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for the average person.
Note: In August, a daily maximum UV index of 6 leads to the following instructions:
Ward off overexposure. Defence against solar harm is crucial. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

Updated: Jan 31, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

In Joetsu, temperatures reach their average annual highs in August, measuring 27.8°C (82°F) and a minimum average of 20.9°C (69.6°F).

An average high-temperature, in August, in Joetsu, is 27.8°C (82°F) and the average low-temperature is 20.9°C (69.6°F). In August, the average heat index (a.k.a. 'real feel', 'feels like'), which factors the actual air temperature with the relative humidity, is calculated to be 32°C (89.6°F).

In August, the average relative humidity is 80%.

In Joetsu, in August, it is raining for 19.4 days, with typically 109mm (4.29") of accumulated precipitation.

In Joetsu, Japan, snow does not fall in May through October.

The month with the warmest seawater in Joetsu, Japan, is August, with an average sea temperature of 27°C (80.6°F).

In August, the average sea temperature in Joetsu is 27°C (80.6°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.

In August, the average day length is 13h and 34min.

On the first day of August in Joetsu, Japan, sunrise is at 04:52 and sunset at 18:54. On the last day of the month, sunrise is at 05:17 and sunset at 18:17 JST.

With an average of 10.3h of sunshine, August has the most sunshine of the year.

In Joetsu, Japan, the average sunshine duration in August is 10.3h.

The months with the highest UV index are June through August, with an average maximum UV index of 6.

The average daily maximum UV index in August in Joetsu, Japan, is 6. A UV Index reading of 6 to 7 represents a high health risk from exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year J F M A M J J August S O N D

Jul

August

Sep

Average high temperature

26.2°C

27.8°C

23.3°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

8.6km/h

9.5km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

7.4

8.3

11.5

Average UV index

Average cloud cover

Average visibility

Average temperature in August
Joetsu, Japan

Average high temperature in August: 27.8°C

The warmest month (with the highest average high temperature) is August (27.8°C).
The month with the lowest average high temperature is January (2.8°C).

Average low temperature in August: 20.9°C

The month with the highest average low temperature is August (20.9°C).
The coldest month (with the lowest average low temperature) is February (-1.9°C).

Average pressure in August
Joetsu, Japan

Average pressure in August: 1010.2mbar

The month with the highest atmospheric pressure is November (1019.2mbar).
The month with the lowest atmospheric pressure is June (1009.2mbar).

Average wind speed in August
Joetsu, Japan

Average wind speed in August: 7.7km/h

The windiest months (with the highest average wind speed) are January and December (15.4km/h).
The calmest months (with the lowest average wind speed) are July and August (7.7km/h).

Average humidity in August
Joetsu, Japan

Average humidity in August: 80%

The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is May (74%).

Average rainfall in August
Joetsu, Japan

Average rainfall in August: 109mm

The wettest month (with the highest rainfall) is July (142mm).
The driest month (with the least rainfall) is May (57mm).

Average rainfall days in August
Joetsu, Japan

Average rainfall days in August: 19.4 days

The month with the highest number of rainy days is July (21.6 days).
The month with the least rainy days is February (10.3 days).

Average snowfall in August
Joetsu, Japan

Average snowfall in August: 0mm

The month with the highest snowfall is January (466mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).

Average snowfall days in August
Joetsu, Japan

Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (17.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average sea temperature in August
Joetsu, Japan

Average sea temperature in August: 27°C

The best month for swimming (with the highest average sea temperature) is August (27°C).
The coldest month (with the lowest average sea temperature) is March (10.3°C).

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

Average daylight in August: 13h and 36min

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).

Average sunshine in August: 10h and 18min

The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 2h and 42min).

Average sunshine days in August
Joetsu, Japan

Average sunshine days in August: 8.3 days

The month with the most sunshine days is May (15.1 days).
The month with the least sunshine days is January (4.3 days).

Average UV index in August
Joetsu, Japan

Average UV index in August: 6

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).