London vs Dublin

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.

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

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

London reaches an average high of 19°C (66°F) and drops to 11°C (52°F) at night during September. The daily temperature range is 8°C, meaning moderate variation throughout the day.

Dublin averages 17°C (63°F) for the high and 11°C (52°F) for the low, with a daily range of 6°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.

London receives approximately 48 mm of rainfall across 9 rain days during September. You can expect rain roughly every other day.

Dublin sees 70 mm over 12 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%.