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Weather extremes

How extreme does Shiogama's weather get?

The hottest, coldest, wettest and snowiest days Shiogama 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 Sendai station 13 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 Shiogama has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
111°F Aug 14, 1994

That is about 29°F hotter than a normal August afternoon in Shiogama (typical high near 83°F).

The three most extreme on record

1 111°F Aug 14, 1994
2 99°F Aug 1, 2018
3 99°F Aug 15, 2007
❄️ Coldest night
18°F Jan 8, 2021

About 11°F colder than a normal January night in Shiogama (typical low near 29°F).

The three most extreme on record

1 18°F Jan 8, 2021recent
2 18°F Jan 9, 2021
3 19°F Feb 4, 2006
🌧️ Most rain in one day
10.61 in Sep 11, 2015

More rain in a single day than Shiogama usually gets in the whole month of September (typical September total about 7.6 in).

The three most extreme on record

1 10.61 in Sep 11, 2015
2 6.59 in Sep 22, 2011
3 5.89 in Oct 14, 2014

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 111°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Shiogama's record heat sits well above even a hot day for the season — August's 111°F is about 29°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, Shiogama's warmest days reach the low 80s°F and its coldest nights drop to the high 20s°F. But across the record it has gone as high as 111°F and as low as 18°F. A single day has delivered over 11 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 Shiogama, about 3 km from the city centre.

How we build these numbers →