Izu Temperature by Month
Izu in Shizuoka, Japan sees significant seasonal temperature differences, with daytime highs between 10°C (50°F) in January and 30°C (86°F) in August, averaging 20°C (68°F) annually. Explore the full monthly breakdown below.
Izu Monthly Temperatures
In Izu, temperatures can shift dramatically between warm in summer and cold in winter. Nights follow the same pattern, with lows ranging from 24°C (75°F) in August to 4°C (39°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Izu 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 165 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Izu vs Japan
The map below shows the annual temperature across Japan. You can also select individual months if you want to compare a specific time of year.
very warm
warm
pleasant
moderate
cold
very cold
Izu vs World: Temperature Compared
Izu's average annual maximum temperature is 20°C (68°F). To put that in context, here's how it compares to a few well-known destinations:
Rome, Italy averages 20°C (68°F) annually, with reliably warm summers and comfortable winters.
Glasgow, Scotland averages 13°C (55°F) a year — mild but often grey, with cold winters and rarely hot summers.
Boston, USA averages 16°C (61°F) annually, with four distinct seasons and cold winters that rival northern Europe.
Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate — hot dry summers and mild wet winters.
What Does the Temperature Feel Like in Izu?
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 Izu, January is the coolest month, with average highs of 10°C (50°F) and humidity around 62% — considered high. In August, the warmest month, temperatures average 30°C (86°F) with 80% humidity — conditions that feel very 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 Izu this rarely lasts long on the ground.
For more on Izu's weather — including monthly rainfall, sunshine hours, and humidity — visit our Izu climate page.
