London vs Paris

London and Paris are closely matched in September. Neither city has a clear advantage across all metrics. Your decision should come down to personal preference, cultural interests, and travel logistics rather than weather alone.

London is on the cooler side at 11°C, requiring warmer clothing. Paris is cooler at 11°C.

For travelers who prioritize dry weather, both cities are equally dry in September.

London reaches an average high of 11°C (52°F) and drops to -1°C (30°F) at night during September. The daily temperature range is 12°C, meaning significant temperature swings between day and night.

Paris averages 11°C (52°F) for the high and -1°C (30°F) for the low, with a daily range of 12°C. The two cities feel quite similar in terms of temperature.

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

London receives approximately 50 mm of rainfall across 4 rain days during September. Rain is occasional, so a light rain jacket should suffice.

Paris sees 50 mm over 4 rain days. Both cities are equally rainy this month.

Both cities share similar humidity levels at 65%.