Yamaguchi Temperature by Month
The average annual maximum temperature in Yamaguchi, Yamaguchi, Japan is 21°C (70°F), with daytime highs ranging from 10°C (50°F) in January to 32°C (90°F) in August. This page covers monthly averages, day-night differences, and how Yamaguchi compares to cities worldwide.
Yamaguchi Monthly Temperatures
The climate in Yamaguchi is known for significant temperature differences throughout the year. At night, this contrast is just as clear, with lows ranging from 24°C (75°F) in August to 2°C (36°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Yamaguchi by month:
Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM. August, the city's warmest month, sees 198 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Yamaguchi 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
warm
pleasant
moderate
cold
very cold
Yamaguchi vs World: Temperature Compared
Yamaguchi's average annual maximum temperature is 21°C (70°F). To put that in context, here's how it compares to a few well-known destinations:
Lisbon, Portugal averages 21°C (70°F) annually — warm summers, mild winters, and rain mainly in the cooler months.
Glasgow, Scotland averages 13°C (55°F) a year — mild but often grey, with cold winters and rarely hot summers.
San Francisco, USA averages 19°C (66°F) annually, but with little seasonal variation — summers are often cool and foggy, winters mild.
Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate — hot dry summers and mild wet winters.
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 Yamaguchi's weather — including monthly rainfall, sunshine hours, and humidity — visit our Yamaguchi climate page.
