Shimonoseki Temperature by Month
Shimonoseki in Yamaguchi, 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.
Shimonoseki Monthly Temperatures
Visitors to Shimonoseki will encounter a climate influenced by big temperature differences across the year. Nighttime temperatures range from 26°C (79°F) in August to 6°C (43°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Shimonoseki 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 198 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Shimonoseki 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
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moderate
cold
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Shimonoseki vs World: Temperature Compared
Shimonoseki'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:
Seville, Spain averages 23°C (73°F) a year — one of the warmer cities in Western Europe, with long hot summers.
Toronto, Canada averages 13°C (55°F) annually, with cold snowy winters balanced by genuinely warm summers.
Boston, USA averages 16°C (61°F) annually, with four distinct seasons and cold winters that rival northern Europe.
Melbourne, Australia averages 20°C (68°F) annually — known for unpredictable weather, with four seasons sometimes happening in one day.
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.
Whether a city sits on the coast or deep inland makes a significant difference to its climate. Coastal areas tend to have more stable temperatures year-round — large bodies of water absorb heat slowly in summer and release it gradually in winter, keeping extremes in check. Cities far from the sea don't benefit from that buffer, which is why continental climates tend to have hotter summers and colder winters than their coastal counterparts at the same latitude.
For more on Shimonoseki's weather — including monthly rainfall, sunshine hours, and humidity — visit our Shimonoseki climate page.
