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Weather extremes

How extreme does Nagasaki's weather get?

The hottest, coldest, wettest and snowiest days Nagasaki 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 Nagasaki station 2 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 Nagasaki has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
100°F Jul 23, 1994

That is about 14°F hotter than a normal July afternoon in Nagasaki (typical high near 86°F).

The three most extreme on record

1 100°F Jul 23, 1994
2 100°F Jul 24, 1994
3 99°F Aug 13, 2019
❄️ Coldest night
24°F Jan 25, 2016

About 14°F colder than a normal January night in Nagasaki (typical low near 38°F).

The three most extreme on record

1 24°F Jan 25, 2016
2 24°F Jan 24, 2016
3 26°F Jan 25, 2023
🌧️ Most rain in one day
9.37 in Mar 24, 2024

More rain in a single day than Nagasaki usually gets in the whole month of March (typical March total about 5.0 in).

The three most extreme on record

1 9.37 in Mar 24, 2024recent
2 8.15 in Jun 24, 2012
3 7.81 in Sep 12, 2020

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°30°50°70°90°110° all-time high 100°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Nagasaki's record heat sits well above even a hot day for the season — July's 100°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, Nagasaki's warmest days reach the high 80s°F and its coldest nights drop to the high 30s°F. But across the record it has gone as high as 100°F and as low as 24°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 Nagasaki, about 2 km from the city centre.

How we build these numbers →