Dublin Weather in September
Ireland · Oceanic climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
September in Dublin sees average temperatures ranging from a low of 11.7°C (53.1°F) to a high of 17.3°C (63.1°F), with a mean of 14.5°C (58.1°F). Compared to the annual average of 11.0°C (51.8°F), this month is 3.5°C warmer than the yearly norm. Precipitation averages 88.1mm, making it approximately 9.0mm wetter than the monthly average of 79.0mm. The city receives an average of 8.3 hours of sunshine per day during September, with relative humidity averaging 81.5%. Wind speeds reach an average maximum of 22.6 km/h. For travelers, this month offers a temperature experience in Dublin, with wetter-than-average conditions compared to the rest of the year.
Dublin's weather is a choose-your-own-adventure where every chapter includes rain. I packed a 'waterproof' jacket once — it wasn't. Bring serious rain gear: Gore-Tex or equivalent, year-round. The good news: rain rarely lasts long. My favorite window is May-June: 15°C, 7 hours of sun, and the pubs still have that winter coziness. August can be oddly humid. Skip January — 5°C, 70mm of rain, 8 hours of daylight if you're lucky. October has a melancholic charm but bring layers. Always pack for four seasons in one day, genuinely.
September vs Adjacent Months
| Metric | August | September | October |
|---|---|---|---|
| Mean Temp | 16.1°C (61.0°F) | 14.5°C (58.1°F) | 12.2°C (54.0°F) |
| Rainfall | 85.2mm | 88.1mm | 117.3mm |
| Sunshine | 9.8 hrs | 8.3 hrs | 6.2 hrs |
| Humidity | 78.8% | 81.5% | 80.8% |
| Wind | 22.4 km/h | 22.6 km/h | 26.5 km/h |
| Rainy Days | 20.4 | 19.2 | 21.8 |
Seasonal Context
September falls in Autumn in the Northern Hemisphere. Autumn sees temperatures gradually cooling from summer highs. For travelers visiting Dublin in September, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Dublin in September?
The average temperature in Dublin during September ranges from 11.7°C (53.1°F) to 17.3°C (63.1°F), with a mean of 14.5°C (58.1°F).
How much does it rain in Dublin in September?
Dublin receives an average of 88.1mm of precipitation in September, spread across approximately 19.2 rainy days.
What should I pack for Dublin in September?
Based on September weather data, pack warm layers, a medium jacket, and waterproof outerwear.
Is September a good time to visit Dublin?
September is a cooler month, suitable for travelers who prefer mild weather and fewer crowds. Pack warm layers and enjoy indoor attractions.
Other Months for Dublin
Cities with Similar September Climate (Oceanic)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 53.35°, -6.26°. Timezone: Europe/Dublin. Last updated: 2026-07-30.