Heathrow Weather in September

September is one of the excellent months to visit Heathrow, with daytime temperatures of 20°C (68°F) and lows of 11°C (52°F) at night. Some rainfall is typical for this time of year.

Rainfall in Heathrow in September

Looking at the last 30 years, the data shows about 12 days with rain, averaging 54 mm (2.1 in) for the month. Expect a fairly normal spread of rainfall this month, with no particular pattern of very heavy or very persistent showers.

Temperature in Heathrow in September

The excellent temperature in Heathrow in September makes it a solid month to visit, with 20°C (68°F) during the day and 11°C (52°F) at night. Conditions are often most pleasant around the middle of the day. At 11°C (52°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.

Sunshine in Heathrow in September

The month experiences a moderate amount of sunlight, with 155 hours of sunshine. This provides a nice balance between sunshine and clouds.

Wind Speed in Heathrow in September

September has wind speeds averaging 3 m/s (6 knots). You can expect comfortable light winds that steadily move flags and feel mild throughout the day. Since this is an average, daily conditions vary from gentle winds to more active breezes.

If your ideal day consists of dry skies and pleasant temperatures, June, July, August and September typically offer the best circumstances for Heathrow.