Killester, Ireland experiences average highs of 13°C (55°F) and lows of 8°C (46°F) throughout the year. Rainfall is frequent, averaging about 13 rainy days per month. Average highs have warmed by 0.8°C (1.4°F) across the available records.
Killester, Ireland Weather & Climate 2026
Monthly climate averages for Killester, Ireland. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: Mar–Sep At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
5/10
Best: June, July, August, September
UV Index
3
Low
Temperature 13°C / 8°C
Feels Like 10°C / 5°C
Rainy Days 13
Rainfall 75 mm
Sunshine 7 h
Humidity 81%
Wind Speed 22 km/h
Dew Point 8°C
Snow Days 2 days
Frost Days 1 days
Hottest Month
19°C
July
Avg Low14°C
Rain14days
Coldest Month
4°C
January
Avg High8°C
Rain12days
Driest Month
12days
January
Avg High8°C
Avg Low4°C
Windiest Month
27 km/h
February (Gusts 57)
Sea Temperature
7°C – 17°C
Warmest water: August (
17.2°C
)
Worst Time to Visit
Consider avoiding January, February, March, December due to very cold temperatures, frequent rain.
Sun Position
Sunrise 04:57
Daylight 17h
Sunset 21:56
Live conditions—
Killester on the map · live conditions
Killester, Ireland
- Continent
- Europe
- Country
- Ireland
- City
- Killester
- Population
- 5.1K
- Coordinates
- 53.37°, -6.20°
Seasonal Breakdown
Spring
Mar–May
Avg High 12°C
Avg Low 7°C
Rain 13 days/mo
Summer
Jun–Aug
Avg High 18°C
Avg Low 13°C
Rain 14 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 14°C
Avg Low 9°C
Rain 13 days/mo
1/3 best months
Winter
Dec–Feb
Avg High 8°C
Avg Low 5°C
Rain 13 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: 9°C / 5°C . Mar: 10°C / 5°C . Apr: 12°C / 6°C . May: 15°C / 9°C . Jun: 17°C / 12°C . Jul: 19°C / 14°C . Aug: 19°C / 14°C . Sep: 17°C / 12°C . Oct: 14°C / 10°C . Nov: 10°C / 7°C . Dec: 9°C / 5°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 64 mm. Feb: 67 mm. Mar: 72 mm. Apr: 68 mm. May: 62 mm. Jun: 74 mm. Jul: 80 mm. Aug: 74 mm. Sep: 91 mm. Oct: 84 mm. Nov: 82 mm. Dec: 80 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 85%. Feb: 81%. Mar: 80%. Apr: 79%. May: 78%. Jun: 77%. Jul: 78%. Aug: 79%. Sep: 81%. Oct: 82%. Nov: 84%. Dec: 86%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 25 km/h . Feb: 27 km/h . Mar: 24 km/h . Apr: 21 km/h . May: 19 km/h . Jun: 19 km/h . Jul: 18 km/h . Aug: 20 km/h . Sep: 22 km/h . Oct: 24 km/h . Nov: 24 km/h . Dec: 25 km/h .
Sunshine
Sunshine
Sunshine: Jan: 4h. Feb: 5h. Mar: 7h. Apr: 9h. May: 11h. Jun: 11h. Jul: 10h. Aug: 9h. Sep: 8h. Oct: 6h. Nov: 4h. Dec: 3h.
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 7°C . Feb: 8°C . Mar: 8°C . Apr: 11°C . May: 14°C . Jun: 16°C . Jul: 17°C . Aug: 17°C . Sep: 16°C . Oct: 14°C . Nov: 11°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 6. Jun: UV 6. Jul: UV 5. Aug: UV 5. Sep: UV 4. 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: 2 days. Feb: 2 days. Mar: 2 days. Apr: 1 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 0.8°C (1.4°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 · 20°C | Jul · 19°C |
| Coldest month | Jan 2025 · 4°C | Jan · 4°C |
| Wettest month | Nov 2025 · 130 mm | Sep · 91 mm |
| Windiest month | Feb 2025 · 26 km/h | Feb · 27 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Fair May
Fair June best
Good July best
Excellent August best
Good September best
Good October
Fair November
Poor December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 8°C / 4°C | 4°C / 0°C | 12days (64 mm) Wet | 3.9h Poor | 85% Humid | 1 Low | Poor | View Details |
| February | 9°C / 5°C | 5°C / 0°C | 13days (67 mm) Wet | 5.2h Fair | 81% Humid | 1.6 Low | Poor | View Details |
| March | 10°C / 5°C | 6°C / 1°C | 14days (72 mm) Wet | 7.2h Good | 80% Humid | 3.2 Moderate | Poor | View Details |
| April | 12°C / 6°C | 8°C / 3°C | 13days (68 mm) Wet | 9.2h Good | 79% Humid | 4.3 Moderate | Fair | View Details |
| May | 15°C / 9°C | 13°C / 7°C | 12days (62 mm) Wet | 11.1h Excellent | 78% Humid | 5.5 High | Fair | View Details |
| June best | 17°C / 12°C | 16°C / 10°C | 14days (74 mm) Wet | 10.8h Excellent | 77% Humid | 5.9 High | Good | View Details |
| July best | 19°C / 14°C | 18°C / 12°C | 14days (80 mm) Wet | 10h Excellent | 78% Humid | 5.3 High | Excellent | View Details |
| August best | 19°C / 14°C | 17°C / 12°C | 13days (74 mm) Wet | 9.4h Good | 79% Humid | 4.9 Moderate | Good | View Details |
| September best | 17°C / 12°C | 15°C / 10°C | 14days (91 mm) Wet | 7.9h Good | 81% Humid | 3.6 Moderate | Good | View Details |
| October | 14°C / 10°C | 11°C / 7°C | 13days (84 mm) Wet | 6h Fair | 82% Humid | 2.2 Moderate | Fair | View Details |
| November | 10°C / 7°C | 7°C / 3°C | 13days (82 mm) Wet | 4.2h Fair | 84% Humid | 1.2 Low | Poor | View Details |
| December | 9°C / 5°C | 5°C / 1°C | 13days (80 mm) Wet | 3.1h Poor | 86% Very Muggy | 0.7 Low | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Killester are June, July, August, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Killester, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Killester is July, with average daytime highs of 19°C (66°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Killester is January, with average overnight lows of 4°C (39°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Killester is September, averaging 91mm of precipitation across 14 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Killester runs through March, June, July, September, with the heaviest rainfall in March. Based on 10-year averages for Killester.
Killester receives approximately 88 sunshine hours per year. The sunniest month is May with around 11 hours. Based on climate data for Killester.
The least favorable months to visit Killester are January, February, March, December, primarily due to very cold temperatures, frequent rain. For the best conditions, consider June, July, August, September instead.
The annual average UV index in Killester is 3, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Killester 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, Killester receives snow. Months with snowfall average 2 snow days and 3 cm (1 in) of accumulation, with about 1 frost days during winter.
Average wind speeds in Killester are 22 km/h (14 mph). The windiest month is February with peak winds reaching 27 km/h (17 mph) (gusts up to 57 km/h / 36 mph).
Killester averages 1 clear-sky days per month with overall cloud cover around 73%. The clearest skies occur in May.
The annual average dew point in Killester is 8°C (46°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Killester 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 Killester 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 Killester. It earns a climate score of 7/10 with Good.
For June in Killester, pack Layered clothing, Light jacket, Umbrella, Waterproof jacket, Waterproof shoes. With average highs of 17°C (63°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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