Okayama weather in May
Temperature, sea and sunshine in May: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in May
Excellent
Best time to visit: April – June, September – November
What is the weather like in Okayama in May?
In May, Okayama is warm: daytime highs average 23 °C, and nights cool down to about 15 °C. The sea averages 17.3 °C – bracing, so a wetsuit helps for longer swims. The sun shines for around 7 hours a day. Rain is frequent, with about 10 rainy days and 124 mm in total. All in all, May is an excellent month for a holiday in Okayama.
May compared
How the weather changes from April to June. Tap a month to open it.
More details for May
- Daylight
- 13 h 57 min05:02 – 18:59
- UV index
- 10 · very highclear sky, noon (estimate)All months
- Muggy days
- 2 daysdew point 18 °C or moreAll months
- Wind
- 19 km/haverage daily peakAll months
- Cloud cover
- 63 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Time zone
- UTC+9Asia/Tokyo
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %65 %
- Few rainy daysweight 30 %61 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in May
- Wetsuit for longer swims
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
- Rain jacket or umbrella
Okayama in May: quick answers
Is Okayama hot in May?
Warm rather than hot: in May, daytime highs in Okayama average 23 °C and nights cool to about 15 °C.
Can you swim in Okayama in May?
Only if you don't mind cold water: in May the sea averages just 17.3 °C. Comfortable swimming is possible from June to October.
Does it rain much in Okayama in May?
Rain is frequent, with about 10 rainy days and 124 mm in total.
Okayama month by month
The whole year in OkayamaAll destinations: JapanWhere to go in MaySea temperature in May
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences