Howth weather in September 2026

Expect daytime maximum temperatures of 17°C in Howth, Ireland in September based on long-term weather averages. There are 4 hours of sunshine per day on average with 16 days with some rainfall and typically 64 mm of rainfall in the month.

  • 17°C maximum daytime temperature in September in Howth17
    17°C max day temperature
  • 4 hours of sunshine per day
  • 16 days with some rainfall in September in Howth16
    16 days with some rainfall
  • 10°C minimum night-time temperature in September in Howth10
    10°C min night temperature
  • 13 hours of daylight per day in September in Howth13
    13 hours of daylight per day
  • No heat & humidity in September in Howth0
    No heat & humidity
  • 64 mm monthly rainfall in September in Howth64
    64 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Howth4
    4 (Moderate) UV index
  • 14°C sea temperature in September in Howth14
    14°C sea temperature

More about Howth

Howth by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Ireland

KLM: Low fares on long haul from £345 return

  • Save on return flights to worldwide destinations
  • Book flights to Abu Dhabi, Jo'burg, Tokyo & more
  • Plus more flights to the Americas, Middle East & Europe
Go to KLM deal >>

View all KLM offers

The September weather guide for Ireland (Howth) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

Back to top

More about Ireland

How warm is it in Howth in September?

Daytime temperatures usually reach 17°C in Howth in September, falling to 10°C at night.

How sunny is it in Howth in September?

There are normally 4 hours of bright sunshine each day in Howth in September - that's 33% of daylight hours.

How warm is the sea around Howth in September?

The average sea temperature around Howth in September is 14°C.

Does it rain in Howth in September?

There are usually 16 days with some rain in Howth in September and the average monthly rainfall is 64mm.

Howth September sunrise & sunset times

Browse the sunrise and sunset times for Howth in September 2026. Select a month to view Howth sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Tuesday, 1st September 2026 05:33 19:14
Tuesday, 15th September 2026 05:58 18:40
Wednesday, 30th September 2026 06:24 18:03

Related posts

Popular travel offers

Explore holiday destinations

More holidays

Save with latest deals & discounts

More deals

Airport parking

More parking

Airport lounges

More lounges

Top ^