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Weather extremes

How extreme does Weymouth's weather get?

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

Based on 33 years of daily weather observations (1992–present), from the Isle Of Portland station 11 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 Weymouth has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
86°F Aug 10, 2003

That is about 19°F hotter than a normal August afternoon in Weymouth (typical high near 67°F).

The three most extreme on record

1 86°F Aug 10, 2003
2 85°F Aug 12, 2025
3 84°F Aug 8, 2020
❄️ Coldest night
23°F Jan 27, 1996

About 18°F colder than a normal January night in Weymouth (typical low near 42°F).

The three most extreme on record

1 23°F Jan 27, 1996
2 24°F Jan 3, 1997
3 24°F Feb 28, 2018
🌧️ Most rain in one day
11.86 in Oct 18, 2005

More rain in a single day than Weymouth usually gets in the whole month of October (typical October total about 3.5 in).

The three most extreme on record

1 11.86 in Oct 18, 2005
2 9.88 in Aug 15, 2004
3 5.44 in Feb 8, 2008

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 86°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Weymouth's record heat sits well above even a hot day for the season — August's 86°F is about 19°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, Weymouth's warmest days reach the high 60s°F and its coldest nights drop to the low 40s°F. But across the record it has gone as high as 86°F and as low as 23°F. A single day has delivered over 12 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 — 1991–2020 normals computed from 29 years of daily observations at Isle OF Portland, a weather station, about 11 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →