Coleraine in Summer
In summer (June, July and August), Coleraine sees average daytime highs around 14°C and overnight lows near 12°C, with 285 mm of rain over about 47 wet days across the season. It is the warmest season of the year and the 3rd-wettest season.
Over the season highs climb from about 12°C in early June to 15°C by late August. The sky is clear or mostly clear about 11% of the time across summer, and the air most often feels dry.
Summer is Coleraine's best season of the year to visit on our travel score. Coleraine has little temperature swing across the year, so its calendar seasons blur — the season framing matters less here than for a place with four distinct seasons. For the whole year in context, see Coleraine's year-round climate.
- Avg daytime high
- 14°C
- warmest season of the year
- Avg overnight low
- 12°C
- Rainfall
- 285 mm
- 47 wet days
- Avg wind
- 20 km/h
- Travel score
- 3.4
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Coleraine in Summer
Over the season highs climb from about 12°C in early June to 15°C by late August.
A typical summer day in Coleraine reaches about 14°C and drops to 12°C overnight. The warmest of the three months is August, the coolest June.
Coleraine weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 8° / 6° | 124 | 20.3 | 0.6 | 7.5 | 1.0 |
| Feb | 8° / 5° | 100 | 16.9 | 1 | 9.2 | 0.9 |
| Mar | 8° / 6° | 91 | 16 | 0.8 | 11.4 | 1.1 |
| Apr | 9° / 7° | 78 | 13.9 | 0.2 | 13.8 | 1.6 |
| May | 11° / 9° | 71 | 13.4 | 0 | 15.8 | 2.3 |
| Jun | 13° / 11° | 86 | 14.6 | 0 | 17 | 2.9 |
| Jul | 14° / 13° | 95 | 16.1 | 0 | 16.5 | 3.5 |
| Aug | 15° / 13° | 104 | 16.2 | 0 | 14.7 | 3.7 |
| Sep | 14° / 12° | 101 | 16.3 | 0 | 12.5 | 3.5 |
| Oct | 12° / 10° | 139 | 18.9 | 0 | 10.2 | 2.6 |
| Nov | 10° / 8° | 149 | 20.8 | 0.2 | 8.1 | 1.7 |
| Dec | 9° / 6° | 147 | 20 | 0.7 | 7 | 1.3 |
Cloud cover in Summer
The sky is clear or mostly clear about 11% of the time across summer.
Chance of precipitation in Summer
Coleraine gets around 285 mm of rain over 47 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 20 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 16 h 42 min in early June to 13 h 42 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 4.4 kWh/m².
Is summer a good time to visit Coleraine?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a weaker month for outdoor sightseeing in Coleraine.
What to pack for Coleraine in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Coleraine sees daytime highs around 14°C and nights near 12°C. Pack rain gear. Worth having: a warm layer, sun protection and a windbreaker. About 47 days see rain.
Sea temperature near Coleraine in Summer
The nearest coast averages about 12°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 27 km away) is warmest in September at about 14°C and coldest in March near 8°C.
The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 9 | 8 | 8 | 8 | 9 | 11 | 13 | 14 | 14 | 13 | 12 | 10 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 9 | Bracing |
| Feb | 8 | Bracing |
| Mar | 8 | Bracing |
| Apr | 8 | Bracing |
| May | 9 | Bracing |
| Jun | 11 | Bracing |
| Jul | 13 | Bracing |
| Aug | 14 | Bracing |
| Sep | 14 | Bracing |
| Oct | 13 | Bracing |
| Nov | 12 | Bracing |
| Dec | 10 | Bracing |
UV index in Coleraine in Summer
Clear-sky midday UV across summer averages around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Coleraine peaks around July 12 at about 5 (high) — a little sun protection helps at midday. It bottoms out near January 1 at about 0 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 5 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 0 | 1 | 2 | 3 | 5 | 5 | 5 | 4 | 3 | 2 | 1 | 0 |
| Level | Low | Low | Moderate | Moderate | High | Moderate | High | Moderate | Moderate | Low | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 0 | Low |
| Feb | 1 | Low |
| Mar | 2 | Moderate |
| Apr | 3 | Moderate |
| May | 5 | High |
| Jun | 5 | Moderate |
| Jul | 5 | High |
| Aug | 4 | Moderate |
| Sep | 3 | Moderate |
| Oct | 2 | Low |
| Nov | 1 | Low |
| Dec | 0 | Low |
Where is Coleraine?
Coleraine sits at 55.1°N, 6.7°W, 5 m above sea level, in United Kingdom. The nearest listed city is Ballymena, 39 km away.
Topography around Coleraine
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Coleraine.
Within 3 km, the terrain around Coleraine has only modest variations in elevation — a maximum elevation change of 82 m around an average of 30 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 385 m; within 80 km, large variations in elevation — a maximum elevation change of 675 m.
The land around Coleraine is covered by grassland (54%) and trees (22%) within 3 km, grassland (57%) and water (24%) within 16 km, and grassland (46%) and water (46%) within 80 km.
United Kingdom travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type D / G / M
- 230 V · 50 Hz
- Prices
- ≈ 89% of US
- price level, 2025
- GDP per capita
- $57,602
- 2025
- Happiness
- 6.7 / 10
- World Happiness, 2025
- Safe drinking water
- 100%
- of population, 2024
- Homicide rate
- 1.1
- per 100k, 2021
- Road deaths
- 3.2
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Coleraine (55.1333°, -6.6667°, elevation 5 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.