London, United Kingdom — Weather in September 2026

Climate Overview

London, United Kingdom in September has mild conditions, with highs averaging 19.5°C (67°F) and noticeably cooler mornings. Rain falls on about 11 days this month.

This month falls at the beginning of Autumn.

Daily highs in September gradually drop from around 21°C (69°F) at the start to 17°C (63°F) by month's end.

Rainfall is heaviest during the last third of the month, while the middle tends to be drier.

Expect around 7.9h of sunshine at the start of September, decreasing to 6.7h by the end.

Wind speeds pick up through the month, from 17 km/h (11 mph) to 21 km/h (13 mph).

The warmest days tend to fall around the 6th, averaging 21.3°C (70°F).

Compared to August, this month is about 3°C cooler with 2 more rainy days. Temperatures begin dropping heading into October.

Monthly September Averages

Temperature

20°C / 12°C

Feels Like

18°C / 10°C

Rain

11 days · 56 mm

Sunshine

7.8h / day

Humidity

78% — Humid

Wind

19 km/h

Wind Direction

WSW (239°)

Gusts

40 km/h

Daylight

12.6 h

Cloud Cover

66%

Clear Sky Days

1.9

UV Index

4 — Moderate

Dew Point

12°C — Comfortable

Moon Phase

Waxing Crescent · 11%

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

HighLow

Daily Precipitation

Rainfall

Daily Sunshine

Sunshine

Daily Wind Speed

Wind Speed

Sun Position

Sunrise 06:36

Daylight 12.7h

Sunset 19:18

Compare Months

Month	Temp	Feels Like	Rain	Sun	Humidity	UV	Status	Details
January	7°C / 2°C	4°C / -2°C	11days (59 mm) Wet	3.6h Poor	88% Very Muggy	1.1 Low	Poor	View Details
February	9°C / 3°C	5°C / -1°C	10days (50 mm) Wet	4.8h Fair	83% Humid	1.6 Low	Poor	View Details
March	11°C / 4°C	7°C / 0°C	12days (55 mm) Wet	6.5h Fair	80% Humid	3.4 Moderate	Poor	View Details
April	14°C / 5°C	11°C / 2°C	9days (41 mm) Wet	9.4h Good	75% Muggy	4.8 Moderate	Fair	View Details
May best	18°C / 9°C	16°C / 6°C	10days (53 mm) Wet	10.5h Excellent	74% Muggy	5.6 High	Good	View Details
June best	21°C / 12°C	20°C / 11°C	9days (62 mm) Wet	11h Excellent	73% Muggy	6.4 High	Excellent	View Details
July best	23°C / 14°C	22°C / 13°C	10days (55 mm) Wet	10.5h Excellent	71% Muggy	5.6 High	Excellent	View Details
August best	22°C / 14°C	21°C / 13°C	9days (53 mm) Wet	9.7h Good	74% Muggy	5.3 High	Excellent	View Details
September best	20°C / 12°C	18°C / 10°C	11days (56 mm) Wet	7.8h Good	78% Humid	4 Moderate	Good	View Details
October	15°C / 9°C	13°C / 7°C	11days (72 mm) Wet	5.7h Fair	83% Humid	2.4 Moderate	Fair	View Details
November	11°C / 5°C	8°C / 2°C	11days (66 mm) Wet	4.2h Fair	87% Very Muggy	1.3 Low	Poor	View Details
December	9°C / 4°C	5°C / 0°C	11days (65 mm) Wet	2.8h Poor	89% Very Muggy	0.8 Low	Poor	View Details

What to Wear

Dress in layers — a mix of long sleeves, light sweaters, and a versatile jacket works best for changeable conditions.

A waterproof jacket or compact umbrella is recommended for occasional showers.

Packing List

Warm evening layerUmbrellaWaterproof jacketComfortable walking shoes

Frequently Asked Questions

Expand all

Is September a good time to visit London?

September is typically good for visiting London, with average highs of 20°C (67°F) and around 11 rainy days. London, United Kingdom in September has mild conditions, with highs averaging 19.5°C (67°F) and noticeably cooler mornin

Does it rain a lot in London in September?

London typically sees around 11 rainy days in September with 56 mm (2.2 in) of total rainfall. Pack a waterproof jacket.

Does it get cold at night in London in September?

Nights in London during September are cool at around 12°C (53°F). Bring a jacket or sweater for evenings.

What should I pack for London in September?

With highs of 20°C (67°F) and lows of 12°C (53°F) in September, we recommend: Warm evening layer, Umbrella, Waterproof jacket, Comfortable walking shoes. Comfortable walking shoes are essential.

Is September among the best months weather-wise in London?

Yes, September offers some of the best weather conditions in London with comfortable temperatures and lower chances of rain.

What is the UV index in London in September?

The average UV index in London during September is 4 (moderate). Sunscreen and sunglasses are recommended during midday hours.

How many hours of daylight are there in London in September?

London gets approximately 13 hours of daylight per day in September, with around 8 hours of sunshine.

Does it snow in London in September?

Snow is uncommon in London during September based on 10-year climate averages.

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