Okayama, known as the 'Land of Sunshine,' enjoys a mild, humid subtropical climate with four distinct seasons. Summers are hot and humid, winters are cool but rarely snowy, and the city receives abundant sunshine throughout the year. Seasonal changes bring varied temperatures and rainfall, making Okayama a comfortable and attractive destination for travellers year-round.
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 colours of the months:
The colour shows the typical temperature: yellow (hot), green (mild) and blue (cold). How strong the colour is shows the travel season: full colour means high season, soft colour 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 grey info boxes point out special things worth knowing, like recurring weather issues or seasonal events.
Okayama features a humid subtropical climate, with clear seasonal changes. Summers (June to August) are hot and humid, with average daytime highs reaching 32–33°C in August and nights staying warm around 24°C. The rainy season, known as 'tsuyu,' peaks in June and July, bringing heavy rainfall – up to 187 mm in June – and high humidity, though typhoon impacts are less severe than in other parts of Japan. Despite the summer heat, sea breezes from the Seto Inland Sea often provide some relief, especially in the evenings.
Spring (March to May) and autumn (September to November) are especially pleasant, with mild temperatures ranging from 13°C to 25°C and lower humidity. These seasons are ideal for outdoor activities, cherry blossom viewing in early April, and enjoying the vibrant autumn foliage. Winters (December to February) are cool but generally mild, with daytime highs around 9–11°C and lows near 0–3°C. Snowfall is rare and usually light, so disruptions are minimal.
Okayama is famous for its abundant sunshine, receiving over 2,000 hours annually. The sunniest months are from April to September, with daily sunshine averaging 6–7 hours. Winds are typically gentle, though early spring can bring brisk breezes. Humidity peaks in July at around 74–80%, but overall, the climate remains comfortable for most of the year, making Okayama a great place for sightseeing and outdoor enjoyment.
| Average climate data for Okayama, Japan | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Average maximum temperature (°C) | 9 | 10 | 13 | 20 | 24 | 28 | 31 | 33 | 29 | 23 | 17 | 12 | 33 |
| Average minimum temperature (°C) | 1 | 1 | 4 | 10 | 15 | 19 | 24 | 25 | 21 | 14 | 8 | 3 | 1 |
| Average precipitation (mm) | 35 | 50 | 87 | 94 | 125 | 170 | 162 | 87 | 133 | 80 | 51 | 31 | 1,105 |
| Average rainfall days (days) | 18 | 17 | 18 | 15 | 14 | 17 | 17 | 13 | 17 | 14 | 14 | 15 | 189 |
| Average snowfall (mm) | 10 | 10 | 10 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 30 |
| Average relative humidity (%) | 64 | 64 | 63 | 61 | 63 | 69 | 74 | 69 | 69 | 68 | 70 | 66 | 67 |
| Average water temperature (°C) | 15 | 13 | 14 | 15 | 18 | 22 | 25 | 27 | 26 | 23 | 20 | 17 | 20 |
| Average daily daylight hours (h) | 10 | 10 | 12 | 13 | 14 | 14 | 14 | 13 | 12 | 11 | 10 | 9 | 12 |
| Average daily sunshine hours (h) | 4 | 5 | 5 | 6 | 6 | 5 | 5 | 6 | 5 | 5 | 5 | 5 | 5 |
| Average UV index | 3 | 4 | 6 | 8 | 9 | 10 | 11 | 10 | 8 | 6 | 3 | 2 | 7 |
The best time to visit Okayama is during spring (April–May) and autumn (October–November). These periods offer mild, comfortable temperatures, lower humidity, and beautiful natural scenery, such as cherry blossoms and autumn foliage. Rainfall is moderate and sunshine is abundant, making outdoor sightseeing and activities especially enjoyable.
The least favourable time to visit Okayama is during the rainy season from June to July and the peak of summer in August. High humidity, frequent heavy rainfall, and temperatures above 30°C can make outdoor activities uncomfortable. Occasional typhoons may also disrupt travel plans during late summer.
Okayama has a humid subtropical climate with four distinct seasons. Winters are mild, summers are hot and humid, and the city is known for its abundant sunshine and moderate rainfall throughout the year.
Snowfall in Okayama is rare and typically light. When it occurs, snow usually melts quickly due to the mild temperatures and coastal influences, so significant accumulation is uncommon.
The rainy season, known as tsuyu, occurs from June to July. During this period, Okayama experiences higher humidity and frequent rainfall, contributing to nearly a third of the annual precipitation.
In summer, average daytime highs range from 31°C to 33°C, with nights staying warm around 23–24°C. High humidity is common, but evening sea breezes can provide some relief.
Yes, spring in Okayama (late March to early April) is ideal for cherry blossom viewing. The city’s parks and gardens, such as Korakuen, are popular spots for enjoying the seasonal blooms.
Okayama is one of Japan’s sunniest cities, enjoying over 2,000 hours of sunshine each year. The sunniest months are from April to September, with daily averages of 6–7 hours.
While Okayama is less prone to typhoons than Japan’s Pacific coast, occasional typhoons can bring heavy rain and strong winds, especially in late summer. However, severe disruptions are relatively rare.
The warmest month, with the highest average maximum temperature, is August (32.8 °C). The month with the lowest average maximum temperature is January (9 °C). Overall, the average maximum temperature over the whole year is 20.6 °C.
The month with the highest average minimum temperature is August (24.8 °C). The coldest month, with the lowest average minimum temperature, is January (1 °C). Overall, the average minimum temperature over the whole year is 12.1 °C.
The month with the highest average water temperature is August (27.3 °C). The month with the lowest average water temperature is February (13.4 °C). Overall, the average water temperature over the whole year is 19.6 °C.
The wettest month, with the highest amount of precipitation, is June (170 mm). The driest month, with the least amount of precipitation, is December (31.2 mm). Over the whole year there are 1,105.1 mm of rainfall on average.
The month with the most days of rain is January (18.1 days). The month with the fewest days of rain is August (13 days). Over the whole year there are 188.9 days of rain on average.
The month with the most snowfall is February (10 mm). The months with the least snowfall are April, May, June, July, August, September, October, November and December (0 mm). Over the whole year there are 29.9 mm of snowfall on average.
The month with the highest average relative humidity is July (73.6 %). The month with the lowest average relative humidity is April (61 %). The overall average relative humidity over the whole year is 66.7 %.
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 May (Average sunshine: 6 h). The month with the least sunshine per day is January (Average sunshine: 4.2 h). Over the whole year there are 5.2 h of sunlight per day on average.
The month with the highest average UV index is July (UV index: 11). The month with the lowest average UV index is December (UV index: 2). Over the whole year the average UV index is 6.7.
