Dublin vs London

Based on sunshine hours, rain days, comfortable temperatures, and humidity levels, London edges ahead as the better destination in September. London offers 8 hours of daily sunshine with only 9 rain days, while Dublin sees 8 sunshine hours and 12 rain days.

Dublin sits in the comfortable travel range at 17°C. London is also comfortable at 19°C.

For travelers who prioritize dry weather, London is the stronger choice in September.

Dublin reaches an average high of 17°C (63°F) and drops to 11°C (52°F) at night during September. The daily temperature range is 6°C, meaning relatively stable temperatures from day to night.

London averages 19°C (66°F) for the high and 11°C (52°F) for the low, with a daily range of 8°C. The 2°C difference is noticeable but not dramatic.

Both cities are in the Northern Hemisphere, so they share the same seasonal pattern in September.

Dublin receives approximately 70 mm of rainfall across 12 rain days during September. You can expect rain roughly every other day.

London sees 48 mm over 9 rain days. That makes London the drier option by 3 rain days and 22 mm of total precipitation.

Both cities share similar humidity levels at 65%.