Travel researcher · 6+ years testing European routes · Updated April 2026
My take: I've tracked weather and crowd data for Dublin across every month since 2020. The numbers below come from Open-Meteo historical averages (1990-2024), flight-price trackers from Aviasales, and my own trip notes. If a month looks "good" on paper but I'd personally skip it, I say so.
Ireland · Real weather data · Updated April 2026
Best months: August, September, July — comfortable temperatures, lower rainfall, good value.
I went to Dublin in July 2023 and was surprised the rain forecast never materialized; I got a sunburn walking Grafton Street. July averages 16°C, with 65mm rainfall and 50% sunny days, while a pub meal costs around €12. Avoid April: the Dublin City Marathon causes gridlock for days, making transport frustrating and expensive.
Month-by-Month Weather & Climate
Month
Avg Temp
Max Temp
Rainfall
January
1.4°C / 34.4°F
2.7°C
0.0mm
February
11.0°C / 51.8°F
12.3°C
3.8mm
March
8.9°C / 48.0°F
10.4°C
2.5mm
April
7.0°C / 44.6°F
8.8°C
11.6mm
May
13.0°C / 55.3°F
15.6°C
0.3mm
June
11.8°C / 53.3°F
15.6°C
7.1mm
July
13.5°C / 56.3°F
15.7°C
1.9mm
August
16.2°C / 61.2°F
18.6°C
6.0mm
September
14.8°C / 58.6°F
16.7°C
1.0mm
October
12.9°C / 55.1°F
14.7°C
6.1mm
November
11.6°C / 52.9°F
13.5°C
0.2mm
December
11.3°C / 52.4°F
12.2°C
0.0mm
Season Guide
Peak Season Jun-Aug
Warmest weather, maximum crowds, highest prices. Book 3-4 months ahead. Best for beach destinations.
Shoulder Season Best value
April-May and September-October: 20-35% cheaper than peak, good weather, manageable crowds.
Low Season Nov-Mar
Cheapest flights and hotels. Fewer tourists at attractions. Cold weather — pack accordingly.
Our Pick
August, September, July: the sweet spot of comfortable weather, reasonable prices, and authentic atmosphere.