August weather forecast
Nagano, Japan

August continues the trend of soaring temperatures in Nagano, Japan, although comparatively cooler than July. The temperatures level off slightly, but the humidity persists, retaining the summer heat wave. This period highlights a decrease in rainfall, yet the occasional shower can cool the air momentarily. Though warm, the city's vibrant greenery strikes a welcoming contrast under the summer skies. Furthermore, the Night Carnival, a highlight of August, turns the city into a festive wonderland with beautifully lit streets.

Temperature

In Nagano, Japan, the peak average temperatures are observed in August, with a high of 31°C (87.8°F) and a low of 21.3°C (70.3°F).

Heat index

In August, the heat index is computed to be a torrid 38°C (100.4°F). Exercise increased caution, heat cramps and heat exhaustion are potential hazards. Continuous activity could lead to heatstroke.
It is important to note that the heat index values are for shaded areas and light wind scenarios. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', joins air temperature with relative humidity to produce a temperature perception for humans. The individual's experience of temperature can be shaped by numerous aspects such as metabolic variations, physical exertion, and attire. 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 especially vital to children. Juveniles often do not understand the need to recuperate and rehydrate. Thirst is a delayed symptom of dehydration - hence, it is vital to maintain hydration, particularly during ongoing physical activities.
Perspiration is essential for the human body; it facilitates cooling through the process of sweat evaporation. An increase in relative humidity retards evaporation, subsequently reducing the body's heat removal rate and leading to a sensation of being overly warm. When the body's heat gain surpasses its removal capacity, body temperature starts to climb, leading to potential heat-related ailments.

Humidity

In August, the average relative humidity is 72%.

Rainfall

In Nagano, in August, it is raining for 9.8 days, with typically 98mm (3.86") of accumulated precipitation. Throughout the year, in Nagano, there are 129.8 rainfall days, and 933mm (36.73") of precipitation is accumulated.

Snowfall

In Nagano, snow does not fall in May through October.

Daylight

In Nagano, Japan, the average length of the day in August is 13h and 32min.
On the first day of August, sunrise is at 04:53 and sunset at 18:53. On the last day of the month, sunrise is at 05:17 and sunset at 18:17 JST.

Sunshine

In August, the average sunshine is 6.6h.