What is the weather like in Dublin in September?

Expect temperatures between 11°C and 17°C with 27% average rain probability and about 8 hours of sunshine daily.

What is the weather like in Dublin in September?

Dublin in September scores 61/100 based on 30 years of climate data. Worthwhile timing with some trade-offs.

Who should visit Dublin in September?

September in Dublin is ideal for: Cultural tourists, Business travelers.

Dublin Weather in September | 30-Year Forecast

Avg High

17°C

Hottest around day 5

Avg Low

11°C

Coolest around day 26

Rainy Days

15days

27% avg rain chance

Sunshine

8hrs/day

Autumn season

Sea Temperature in September

Irish Sea

15°C

Monthly Average

Water Feel

💧Refreshing

Consider a wetsuit for extended swimming

Swim Rating

🏄Cool, wetsuits recommended

Based on average sea surface temperature

Body of Water

Irish Sea

Dublin coastline

Essential Travel Info for Dublin

🗓️ Best Time to Visit 📖 Travel Guide 🍴 Food Guide

Currency

EUR

€ Euro

Language

English

+1 more

Driving

Left side

Connect

As of July 2024, all of the city and its...

Safety

Very High Safety

GPI: 1.288

Travel Intelligence

Exclusive flight analytics & health data for Dublin

Smart Flight Estimator

Airport-to-Airport Logistics

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Flight Connectivity Analysis

Airport traffic data & seasonal patterns

Well Connected

68/ 100

Traffic Index

Popular destination

Peak Daily Arrivals

slots per day

Peak

Jun

Low

Jul

Monthly Traffic Distribution

270

Jan

335

Feb

353

Mar

371

Apr

408

May

414

Jun

243

Jul

398

Aug

385

Sep

364

Oct

319

Nov

332

Dec

Traffic Level

Low Season

Key Connections

London Heathrow (LHR)

Manchester (MAN)

Amsterdam Schiphol (AMS)

Birmingham (BHX)

Edinburgh (EDI)

Health & Safety Advisory

CDC travel health recommendations

6 Recommendations

COVID-19

All eligible travelers should be up to date with their COVID-19 vaccines. Please seeYour COVID-19 Vaccinationfor more information.

Hepatitis A

Consider hepatitis A vaccination for most travelers. It is recommended for travelers who will be doing higher risk activities, such as visiting smaller cities, villages, or rural areas where a traveler might get infected through food or water. It is recommended for travelers who plan on eating street food.

Hepatitis B

Recommended for unvaccinated travelers younger than 60 years old traveling to Ireland. Unvaccinated travelers 60 years and older may get vaccinated before traveling to Ireland.

Measles

Cases of measles are on the rise worldwide. Travelers are at risk of measles if they have not been fully vaccinated at least two weeks prior to departure, or have not had measles in the past, and travel internationally to areas where measles is spreading.All international travelers should be fully vaccinated against measles with the measles-mumps-rubella (MMR) vaccine, including an early dose for infants 6–11 months, according toCDC’s measles vaccination recommendations for international travel.

Rabies

Dogs infected with rabies are not commonly found in Ireland.If rabies exposures occur while in Ireland, rabies vaccines are typically available throughout most of the country.Rabies pre-exposure vaccination considerations include whether travelers 1) will be performing occupational or recreational activities that increase risk for exposure to potentially rabid animals and 2) might have difficulty getting prompt access to safe post-exposure prophylaxis.Please consult with a healthcare provider to determine whether you should receive pre-exposure vaccination before travel.For more information, seecountry rabies status assessments.

Yellow Fever

CDC recommendations:Vaccine isnotrecommended.Country entry requirements:Vaccine isnotrequired.Updated April 23, 2025

Source: CDC Travelers' Health

View Complete Health Guide

Is September a Good Time to Visit Dublin?

👌Worthwhile timing with some trade-offs(61/100)

Short Answer

Dublin in September features 15°C seas - too cold for swimming but stunning for coastal walks. Air temperatures average 17°C with 27% rain probability.

Decision Factors

Vaccinations required

Yellow Fever

Very high humidity

82% average humidity

Peak tourist season

93% of annual peak - expect crowds and peak prices

Cold sea - swimming challenging

15°C sea temperature - Polar Plunge

Health precautions needed

Be aware of: Leptospirosis, Hantavirus, Parvovirus B19

Exceptional dining scene

47 Michelin-listed restaurants

Good For

🏛️
Cultural tourists
Comfortable conditions for exploring museums and sites
💼
Business travelers
Climate-controlled meetings unaffected by weather

Who Should Avoid

🏖️
Beach lovers
Sea temperature only 15°C - too cold for comfortable swimming
💰
Budget travelers
Peak season means premium prices everywhere
👴
Elderly travelers
82% humidity creates difficult conditions

"According to 30YearWeather's analysis of 30 years of NASA POWER satellite data,Dublin in September averages 17°C with 27% precipitation probability."

📊 Source: 30YearWeather.com🛰️ Data: NASA POWER (1991-2021)View Methodology →

Frequently Asked Questions: Dublin in September

What are the temperatures in Dublin in September?

Daytime highs average 17°C, nights drop to 11°C. Temperatures remain fairly consistent.

How many rainy days in Dublin in September?

Expect around 15 days with measurable rainfall. Rain is unlikely to disrupt plans.

What to wear in Dublin in September?

Layers are key. A medium-weight jacket and closed-toe shoes.

Is September peak season in Dublin?

This is shoulder season—moderate prices and manageable crowds.

Dublin Weather in September

Sea Temperature in September

Dublin September Weather Calendar

Essential Travel Info for Dublin

Travel Intelligence

Smart Flight Estimator

Flight Connectivity Analysis

Monthly Traffic Distribution

Key Connections

Health & Safety Advisory

COVID-19

Hepatitis A

Hepatitis B

Measles

Rabies

Yellow Fever

Is September a Good Time to Visit Dublin?

Decision Factors

Good For

Who Should Avoid

Related Guides

Frequently Asked Questions: Dublin in September

What are the temperatures in Dublin in September?

How many rainy days in Dublin in September?

What to wear in Dublin in September?

Is September peak season in Dublin?