Izu, located on the scenic Izu Peninsula in Shizuoka Prefecture, enjoys a humid subtropical climate with four distinct seasons. Summers are hot, humid, and rainy, while winters are mild and relatively dry. The region is famous for its hot springs, beaches, and lush landscapes, with abundant rainfall and sunshine shaping its year-round appeal.
The best times to travel section shows how the months compare for a visit, so you can find the time of year that fits what you want to do.
Background colors of the months:
The color shows the typical temperature: yellow (hot), green (mild) and blue (cold). How strong the color is shows the travel season: full color means high season, soft color means shoulder season and soft-striped means off season.
Weather symbols:
Each month has one symbol showing what the weather is typically like, such as hot and sunny, freezing or a rainy or snowy season. Use them to quickly spot months that match the weather you want, or to avoid the ones that don't.
Crowdedness:
The people icon shows how busy the place usually is. The more people, the more crowded it gets.
Additional notes:
The gray info boxes point out special things worth knowing, like recurring weather issues or seasonal events.
Izu’s climate is characterized by warm, humid summers and mild, relatively dry winters. Average maximum temperatures peak at 30°C in August, while January is the coldest month with highs around 10°C and lows near 4°C. The area receives significant annual rainfall, averaging about 2,200 mm, with the wettest month being June (up to 275 mm). Rainy days are common from late spring to early autumn, but the region also enjoys ample sunshine, especially in winter and late summer. Humidity is high throughout the year, peaking at over 80% in July and September, and dropping to around 62% in January. Winds are generally moderate, with the windiest months in late winter and early spring, averaging up to 18 km/h. Sunshine hours are highest in January and August, with over 200 hours per month, while September is cloudier with shorter sunny periods. Snowfall is rare and usually limited to higher elevations.
Spring and autumn are particularly pleasant, with mild temperatures (14–24°C) and lower humidity, making these seasons ideal for sightseeing, hiking, and enjoying cherry blossoms or autumn foliage. Summers are popular for beach activities, though visitors should be prepared for high humidity and occasional typhoons. Winters, while cooler, are mild compared to much of Japan and offer clear days perfect for enjoying hot springs and views of Mount Fuji. The maritime influence moderates temperature extremes, providing a comfortable climate for outdoor activities most of the year.
| Average climate data for Izu, Japan | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Average maximum temperature (°F) | 48 | 50 | 55 | 61 | 69 | 73 | 80 | 83 | 78 | 70 | 62 | 53 | 83 |
| Average minimum temperature (°F) | 40 | 41 | 45 | 53 | 60 | 66 | 73 | 76 | 71 | 62 | 54 | 45 | 40 |
| Average precipitation (inch) | 2 | 3 | 5 | 6 | 4 | 6 | 6 | 2 | 6 | 7 | 4 | 3 | 53 |
| Average rainfall days (days) | 10 | 14 | 17 | 17 | 15 | 18 | 15 | 12 | 17 | 17 | 15 | 12 | 180 |
| Average snowfall (inch) | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| Average snowfall days (days) | 1 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 |
| Average relative humidity (%) | 67 | 70 | 70 | 74 | 78 | 83 | 85 | 83 | 80 | 78 | 74 | 69 | 76 |
| Average wind speed (mph) | 11 | 10 | 11 | 11 | 9 | 8 | 9 | 8 | 9 | 10 | 10 | 11 | 10 |
| Average daily daylight hours (h) | 10 | 10 | 12 | 13 | 14 | 14 | 14 | 13 | 12 | 11 | 10 | 9 | 12 |
| Average daily sunshine hours (h) | 6 | 5 | 6 | 8 | 9 | 8 | 9 | 10 | 7 | 6 | 5 | 6 | 7 |
| Average cloud coverage (%) | 29 | 44 | 44 | 44 | 39 | 48 | 43 | 33 | 43 | 45 | 39 | 32 | 40 |
| Average UV index | 3 | 3 | 4 | 5 | 5 | 6 | 6 | 6 | 5 | 4 | 4 | 3 | 4 |
The best times to visit Izu are in spring (April to May) and autumn (October to November). These months offer mild temperatures, lower humidity, and abundant sunshine, making them perfect for sightseeing, enjoying cherry blossoms or autumn foliage, and outdoor activities. Rainfall is moderate and weather conditions are generally stable.
The least favorable time to visit Izu is during the rainy season in June and September, when humidity and rainfall are at their highest. Summer (July–August) can also be hot and muggy, with occasional typhoons and high UV levels. Winter, while mild, is less appealing for warm-weather activities.
Izu’s average annual temperature ranges from 6°C in January to 29°C in August. The hottest month is August (average high 30°C), while January is the coldest (average high 10°C, low 4°C).
Yes, Izu receives about 2,200 mm of rainfall annually. The wettest months are June and September, with June seeing up to 275 mm of rain. Winters are much drier.
Snow is rare in Izu, especially at lower elevations. Most winter days are mild and dry, though higher mountain areas may occasionally see light snowfall.
Cherry blossoms typically bloom from late March to early April in Izu. This is a popular time for visitors, with many parks and riverside areas hosting hanami (blossom viewing) events.
Typhoons can occasionally impact Izu, especially from late summer to early autumn. While direct hits are rare, travelers should monitor weather forecasts during this period for potential disruptions.
Pack light layers for spring and autumn, breathable clothing and rain gear for summer, and a warm jacket for winter. Sun protection is essential in summer due to high UV levels.
Izu enjoys abundant sunshine, especially in winter and late summer, with 7–10 hours of daylight per day. January and August are the sunniest months.
The warmest month, with the highest average maximum temperature, is August (83.3 °F). The month with the lowest average maximum temperature is January (48.1 °F). Overall, the average maximum temperature over the whole year is 65 °F.
The month with the highest average minimum temperature is August (75.6 °F). The coldest month, with the lowest average minimum temperature, is January (39.9 °F). Overall, the average minimum temperature over the whole year is 57.1 °F.
The wettest month, with the highest amount of precipitation, is October (6.7 inch). The driest month, with the least amount of precipitation, is August (2 inch). Over the whole year there are 53.3 inch of rainfall on average.
The month with the most days of rain is June (17.9 days). The month with the fewest days of rain is January (9.7 days). Over the whole year there are 180 days of rain on average.
The month with the most snowfall is February (0.9 inch). The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0 inch). Over the whole year there are 1.1 inch of snowfall on average.
The month with the most days of snowfall is February (2.1 days). The months with the fewest days of snowfall are April, May, June, July, August and October (0 days). Over the whole year there are 3.6 days of snowfall on average.
The month with the highest average relative humidity is July (85.5 %). The month with the lowest average relative humidity is January (67.1 %). The overall average relative humidity over the whole year is 75.9 %.
The windiest month, with the highest average wind speed, is March (11.3 mph). The calmest month, with the lowest average wind speed, is June (8.4 mph). The overall average wind speed over the whole year is 9.9 mph.
The month with the cloudiest skies, so the highest cloud coverage, is June (48.2 %). The month with the clearest skies, so the lowest cloud coverage, is January (29.4 %). Over the whole year there is an average cloud coverage of 40.2 %.
The month with the longest days, so the most daylight, is June (Average daylight: 14 h). The month with the shortest days, so the least daylight, is December (Average daylight: 9.1 h). Over the whole year there are 11.9 h of daylight per day on average.
The month with the most sunshine per day is August (Average sunshine: 10.2 h). The month with the least sunshine per day is February (Average sunshine: 4.9 h). Over the whole year there are 7.1 h of sunlight per day on average.
The months with the highest average UV index are June, July and August (UV index: 6). The months with the lowest average UV index are January, February and December (UV index: 3). Over the whole year the average UV index is 4.5.
