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Weather extremes

How extreme does Barreiro's weather get?

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

Based on 28 years of daily weather observations (1997–present), from the Montijo station 6 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 Barreiro has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
109°F Aug 4, 2018

That is about 24°F hotter than a normal August afternoon in Barreiro (typical high near 85°F).

The three most extreme on record

1 109°F Aug 4, 2018
2 108°F Aug 1, 2003
3 108°F Jun 17, 2017
❄️ Coldest night
27°F Jan 13, 2021

About 19°F colder than a normal January night in Barreiro (typical low near 45°F).

The three most extreme on record

1 27°F Jan 13, 2021recent
2 27°F Jan 20, 2017
3 28°F Jan 12, 2021
🌧️ Most rain in one day
11.89 in Mar 17, 2002

More rain in a single day than Barreiro usually gets in the whole month of March (typical March total about 2.5 in).

The three most extreme on record

1 11.89 in Mar 17, 2002
2 4.21 in Jan 16, 2002
3 3.19 in Jan 19, 2002

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°130° all-time high 109°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Barreiro's record heat sits well above even a hot day for the season — August's 109°F is about 24°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, Barreiro's warmest days reach the mid-80s°F and its coldest nights drop to the mid-40s°F. But across the record it has gone as high as 109°F and as low as 27°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 Lisboa Geofisica, a weather station, about 9 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →