Niigata Temperature by Month

Niigata in Niigata Prefecture, Japan sees significant seasonal temperature differences, with daytime highs between 7°C (45°F) in January and 30°C (86°F) in August, averaging 18°C (64°F) annually. Explore the full monthly breakdown below.

The weather in Niigata experiences significant differences between warm and cold seasons, with big shifts in temperature. At night, minimum temperatures range from 24°C (75°F) in August to 1°C (34°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Niigata by month:

Daily lows are most common between 4 AM and 6 AM. By 3 PM temperatures reach their daily high, driven by peak solar heating. August, the warmest month of the year, receives 209 hours of sunshine.

The chart below shows the average temperature throughout the year:

Niigata's average annual maximum temperature is 18°C (64°F). To put that in context, here's how it compares to a few well-known destinations:

Barcelona, Spain has an annual average of around 21°C (70°F), with warm summers and mild, fairly short winters.

Reykjavík, Iceland averages 9°C (48°F) a year, mild summers by Icelandic standards, but cold winters and frequent wind.

Shanghai, China averages 21°C (70°F) a year, with warm summers, mild winters, and a noticeable spring and autumn.

Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.

In Niigata, January is the coolest month, with average highs of 7°C (45°F) and humidity around 72%, considered high. In August, the warmest month, temperatures average 30°C (86°F) with 75% humidity, conditions that feel high. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Niigata this rarely lasts long on the ground.

For more on Niigata's weather, including monthly rainfall, sunshine hours, and humidity, visit our Niigata climate page.