How extreme does Coleraine's weather get?

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

Based on 14 years of daily weather observations (2011–present), from the Magilligan No 2 station 17 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 Coleraine has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day

86°F Jul 12, 2025

The three most extreme on record

1 86°F Jul 12, 2025recent

2 83°F Jun 20, 2025

3 83°F Jul 13, 2025

❄️ Coldest night

17°F Jan 31, 2019

The three most extreme on record

1 17°F Jan 31, 2019

2 19°F Dec 13, 2022

3 21°F Feb 25, 2013

🌧️ Most rain in one day

1.68 in Aug 31, 2019

The three most extreme on record

1 1.68 in Aug 31, 2019

2 1.59 in Aug 8, 2021

3 1.49 in Nov 15, 2015

In plain terms

Across the record, Coleraine has reached as high as 86°F and as low as 17°F. A single day has delivered over 2 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 26 years of daily observations at Portglenone, a weather station, about 33 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →

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