Killyleagh, United Kingdom experiences average highs of 13°C (55°F) and lows of 8°C (46°F) throughout the year. Rainfall is frequent, averaging about 14 rainy days per month. Average highs have warmed by 0.7°C (1.3°F) across the available records.
Killyleagh, United Kingdom Weather & Climate 2026
Monthly climate averages for Killyleagh, United Kingdom. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Jul 
Wetter season: Aug–Dec At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
4.4/10
Best: May, June, July, August, September
UV Index
3
Low
Temperature 13°C / 8°C
Feels Like 10°C / 5°C
Rainy Days 14
Rainfall 82 mm
Sunshine 7 h
Humidity 81%
Wind Speed 25 km/h
Dew Point 7°C
Snow Days 1 days
Frost Days 1 days
Hottest Month
18°C
July
Avg Low13°C
Rain14days
Coldest Month
4°C
January
Avg High8°C
Rain13days
Driest Month
11days
April
Avg High11°C
Avg Low6°C
Windiest Month
31 km/h
February (Gusts 53)
Sea Temperature
8°C – 16°C
Warmest water: August (
16.1°C
)
Worst Time to Visit
Consider avoiding January, February, March, December due to very cold temperatures, frequent rain.
Sun Position
Sunrise 04:49
Daylight 17.2h
Sunset 22:00
Live conditions—
Killyleagh on the map · live conditions
Killyleagh, United Kingdom
- Continent
- Europe
- Country
- United Kingdom
- City
- Killyleagh
- Population
- 2.6K
- Coordinates
- 54.40°, -5.65°
Seasonal Breakdown
Spring
Mar–May
Avg High 12°C
Avg Low 7°C
Rain 12 days/mo
1/3 best months
Summer
Jun–Aug
Avg High 18°C
Avg Low 13°C
Rain 14 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 13°C
Avg Low 10°C
Rain 15 days/mo
1/3 best months
Winter
Dec–Feb
Avg High 8°C
Avg Low 5°C
Rain 14 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 8°C / 4°C . Feb: 8°C / 5°C . Mar: 9°C / 5°C . Apr: 11°C / 6°C . May: 14°C / 9°C . Jun: 17°C / 12°C . Jul: 18°C / 13°C . Aug: 18°C / 13°C . Sep: 16°C / 12°C . Oct: 13°C / 10°C . Nov: 10°C / 7°C . Dec: 9°C / 6°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 73 mm. Feb: 80 mm. Mar: 73 mm. Apr: 58 mm. May: 58 mm. Jun: 75 mm. Jul: 87 mm. Aug: 94 mm. Sep: 94 mm. Oct: 101 mm. Nov: 93 mm. Dec: 96 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 83%. Feb: 80%. Mar: 80%. Apr: 78%. May: 78%. Jun: 78%. Jul: 80%. Aug: 81%. Sep: 81%. Oct: 81%. Nov: 82%. Dec: 84%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 28 km/h . Feb: 31 km/h . Mar: 26 km/h . Apr: 24 km/h . May: 21 km/h . Jun: 21 km/h . Jul: 20 km/h . Aug: 22 km/h . Sep: 25 km/h . Oct: 27 km/h . Nov: 28 km/h . Dec: 29 km/h .
Sunshine
Sunshine
Sunshine: Jan: 4h. Feb: 5h. Mar: 7h. Apr: 9h. May: 11h. Jun: 10h. Jul: 9h. Aug: 9h. Sep: 7h. Oct: 5h. Nov: 4h. Dec: 3h.
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 8°C . Feb: 8°C . Mar: 8°C . Apr: 10°C . May: 13°C . Jun: 15°C . Jul: 15°C . Aug: 16°C . Sep: 15°C . Oct: 14°C . Nov: 12°C . Dec: 9°C .
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 1. Feb: UV 2. Mar: UV 3. Apr: UV 4. May: UV 5. Jun: UV 6. Jul: UV 5. Aug: UV 5. Sep: UV 3. Oct: UV 2. Nov: UV 1. Dec: UV 1.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 1 days. Feb: 2 days. Mar: 1 days. Apr: 0 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 0 days. Dec: 1 days.
Climate Trends
Average highs have warmed by 0.7°C (1.3°F) across the available records. Average rainfall is trending wetter by about 12 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 19°C | Jul · 18°C |
| Coldest month | Jan 2025 · 4°C | Jan · 4°C |
| Wettest month | Nov 2025 · 137 mm | Oct · 101 mm |
| Windiest month | Feb 2025 · 30 km/h | Feb · 31 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Poor May best
Fair June best
Good July best
Good August best
Fair September best
Fair October
Poor November
Poor December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 8°C / 4°C | 4°C / 0°C | 13days (73 mm) Wet | 3.7h Poor | 83% Humid | 0.9 Low | Poor | View Details |
| February | 8°C / 5°C | 4°C / -1°C | 14days (80 mm) Wet | 5h Fair | 80% Humid | 1.5 Low | Poor | View Details |
| March | 9°C / 5°C | 5°C / 0°C | 14days (73 mm) Wet | 6.8h Fair | 80% Humid | 2.8 Moderate | Poor | View Details |
| April | 11°C / 6°C | 8°C / 2°C | 11days (58 mm) Wet | 8.9h Good | 78% Humid | 4 Moderate | Poor | View Details |
| May best | 14°C / 9°C | 12°C / 6°C | 12days (58 mm) Wet | 10.6h Excellent | 78% Humid | 5.4 High | Fair | View Details |
| June best | 17°C / 12°C | 15°C / 9°C | 14days (75 mm) Wet | 10.3h Excellent | 78% Humid | 5.6 High | Good | View Details |
| July best | 18°C / 13°C | 17°C / 11°C | 14days (87 mm) Wet | 9.4h Good | 80% Humid | 5.1 High | Good | View Details |
| August best | 18°C / 13°C | 17°C / 11°C | 15days (94 mm) Wet | 8.9h Good | 81% Humid | 4.8 Moderate | Fair | View Details |
| September best | 16°C / 12°C | 14°C / 9°C | 15days (94 mm) Wet | 7.3h Good | 81% Humid | 3.3 Moderate | Fair | View Details |
| October | 13°C / 10°C | 10°C / 6°C | 15days (101 mm) Wet | 5.2h Fair | 81% Humid | 1.9 Low | Poor | View Details |
| November | 10°C / 7°C | 7°C / 3°C | 15days (93 mm) Wet | 4h Fair | 82% Humid | 1.1 Low | Poor | View Details |
| December | 9°C / 6°C | 5°C / 1°C | 15days (96 mm) Wet | 2.8h Poor | 84% Humid | 0.6 Low | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Killyleagh are May, June, July, August, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Killyleagh, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Killyleagh is July, with average daytime highs of 18°C (64°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Killyleagh is January, with average overnight lows of 4°C (40°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Killyleagh is October, averaging 101mm of precipitation across 15 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Killyleagh runs through August, September, October, November, with the heaviest rainfall in August. Based on 10-year averages for Killyleagh.
Killyleagh receives approximately 83 sunshine hours per year. The sunniest month is May with around 11 hours. Based on climate data for Killyleagh.
The least favorable months to visit Killyleagh are January, February, March, December, primarily due to very cold temperatures, frequent rain. For the best conditions, consider May, June, July, August, September instead.
The annual average UV index in Killyleagh is 3, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Killyleagh is 81%, classified as humid. High humidity makes warm temperatures feel significantly hotter — lightweight, breathable clothing is recommended.
Sea temperatures in Summer average 12°C (54°F), which most swimmers will find too cold without a wetsuit.
Yes, Killyleagh receives snow. Months with snowfall average 1 snow days and 1 cm (0 in) of accumulation, with about 1 frost days during winter.
Average wind speeds in Killyleagh are 25 km/h (16 mph). The windiest month is February with peak winds reaching 31 km/h (19 mph) (gusts up to 53 km/h / 33 mph).
Killyleagh averages 1 clear-sky days per month with overall cloud cover around 72%. The clearest skies occur in April.
The annual average dew point in Killyleagh is 7°C (45°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Killyleagh has a Oceanic climate, classified as Cfb under the Köppen system. Temperate climates have mild winters and warm summers, with rainfall spread across the year and four distinct seasons.
The 'feels like' temperature in Killyleagh ranges from 5°C (41°F) to 10°C (50°F) on average. Wind chill makes winters feel noticeably colder than the actual temperature — layered clothing is recommended.
Yes, June is a great time to visit Killyleagh. It earns a climate score of 7/10 with Good.
For June in Killyleagh, pack Layered clothing, Light jacket, Umbrella, Waterproof jacket, Waterproof shoes. With average highs of 17°C (62°F) and 14 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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