Onjuku Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Onjuku.
Climate overview of Onjuku
Temperatures in Onjuku, Chiba, Japan, vary greatly throughout the year. August is the hottest month at 30°C (86°F), while January is the coldest at 12°C (54°F).
With around 1790 mm (70 in) of annual rainfall, Onjuku has a notably wet climate. However, this rainfall is not evenly distributed, the city has warm summers and cold winters. The wettest month is October. January is the sunniest month, averaging 6.4 hours of sunshine per day.
Onjuku Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Onjuku - and find the best time to visit.
Monthly Temperature in Onjuku
The climate in Onjuku is known for significant temperature differences throughout the year, making the weather dynamic. Average daytime temperatures reach a comfortable 30°C (86°F) in August. In January, the coolest month of the year, temperatures drop to a chilly 12°C (54°F).
At night, temperatures range from around 25°C (77°F) in August to 6°C (43°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Onjuku
Onjuku has a notably wet climate with abundant precipitation, recording 1790 mm (70 in) of rainfall per year. Onjuku can be quite wet during October, receiving approximately 232 mm (9.1 in) of precipitation over 17 rainy days.
In contrast, during the driest month (December), you will experience much drier conditions, with 100 mm (3.9 in) of precipitation spread across 12 rainy days. For more details, please visit our Onjuku Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Onjuku
Onjuku experiences moderate variation in sunshine hours across the seasons. With 6.4 hours daily sunshine in January, it dips to 4.1 hours in June, offering a balanced mix of sunny and overcast days.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Humidity in Onjuku by Month
The relative humidity is high throughout the year in Onjuku.
The city experiences its highest humidity in July, reaching 77%. In January, the humidity drops to its lowest level at 53%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Onjuku
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May and July
- Warmest weather: July and August
- Most sunshine: January and August
- Fewest rainy days: January, February and December
- Seasonal pattern: Warm summers and cold winters
Frequently asked questions about the climate in Onjuku
What is the best time to visit Onjuku?
May and July typically offer the most optimal weather in Onjuku. In contrast, January and February tend to have less optimal conditions. Onjuku has warm summers and cold winters.
What temperatures can I expect in Onjuku?
Daytime highs range from 12°C (54°F) in January to 30°C (86°F) in August. Nighttime lows range from 6°C (43°F) to 25°C (77°F). Temperatures vary considerably through the year.
How much rain does Onjuku get?
Annual rainfall is around 1790 mm (70 in). October is the wettest month with 232 mm (9.1 in), while December is the driest with 100 mm (3.9 in).
How sunny is Onjuku?
Onjuku receives around 1,957 hours of sunshine per year. January is the sunniest month with 193 hours, while June is the cloudiest with just 124 hours.
Onjuku 3-Day Forecast
Onjuku on the map
Onjuku is highlighted - select any city to see its climate.
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