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Weather extremes

How extreme does Shūnan's weather get?

The hottest, coldest, wettest and snowiest days Shūnan has recorded — the outer limits of what its weather can do, and how far they sit beyond a normal day.

Based on 34 years of daily weather observations (1991–present), from the Yamaguchi station 34 km away. Updated through August 2025 — an all-time extreme only changes when a more extreme day actually occurs, so some dates are old. That is normal, not stale data.

The four kinds of extreme

The hottest, coldest, wettest and snowiest single days Shūnan has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
102°F Jul 25, 2018

That is about 14°F hotter than a normal July afternoon in Shūnan (typical high near 88°F).

The three most extreme on record

1 102°F Jul 25, 2018
2 102°F Aug 8, 2024
3 102°F Jul 19, 2018
❄️ Coldest night
18°F Jan 23, 2004

About 14°F colder than a normal January night in Shūnan (typical low near 32°F).

The three most extreme on record

1 18°F Jan 23, 2004
2 19°F Jan 25, 2016
3 19°F Jan 22, 2004
🌧️ Most rain in one day
9.06 in Sep 19, 2022

More rain in a single day than Shūnan usually gets in the whole month of September (typical September total about 6.6 in).

The three most extreme on record

1 9.06 in Sep 19, 2022recent
2 8.11 in Aug 14, 2021
3 7.80 in Aug 10, 2025

How hot and cold it gets, month by month

The shaded band is the normal range of daily temperatures for each month. The dots show the most extreme it has ever been — so you can see how far beyond a normal day the records really sit.

-10°10°30°50°70°90°110°130° all-time high 102°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Shūnan's record heat sits well above even a hot day for the season — July's 102°F is about 14°F beyond a normal hot afternoon. Its record cold is just as far below a normal winter night — the dots mark how rare each extreme really is.

In plain terms

In a normal year, Shūnan's warmest days reach the low 90s°F and its coldest nights drop to the low 30s°F. But across the record it has gone as high as 102°F and as low as 18°F. A single day has delivered over 9 inches of rain. Those are the outer edges worth knowing if you are moving here, planning a trip, or thinking about a house.
Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Otake, about 40 km from the city centre.

How we build these numbers →