Monthly climate averages for Killester, Ireland. Based on 10-year ERA5 reanalysis data.
Cfb Oceanic
Climate OverviewKillester, Ireland in August has mild conditions, with highs averaging 18.6°C (65°F) and noticeably cooler mornings. Rain falls on about 13 days this month. Sea temperature stays cool at 17.2°C (63°F).
This month falls at the end of Summer.
Temperatures remain fairly steady throughout August, with daily highs around 18°C (64°F).
August sees fairly even rainfall, totalling about 74 mm across the month.
The warmest days tend to fall around the 13th, averaging 19.5°C (67°F).
Daily averages based on historical data (2016–2025)
Keep afternoons flexible as tropical showers are common — they typically clear within an hour.
Rain usually comes in shorter passing showers rather than all-day rain.
1 of the last 5 yearly records were warmer than this month's long-run average.
| 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 |
Dress in layers — a mix of long sleeves, light sweaters, and a versatile jacket works best for changeable conditions.
A waterproof jacket or compact umbrella is recommended for occasional showers.
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