What is the weather like in London in September?

Expect temperatures between 11°C and 19°C with 21% average rain probability and about 8 hours of sunshine daily.

What is the weather like in London in September?

London in September scores 64/100 based on 30 years of climate data. A reasonable choice for your trip.

Who should visit London in September?

September in London is ideal for: Outdoor enthusiasts, Cultural tourists, Honeymoon couples, Business travelers.

London Weather in September | 30-Year Forecast

Avg High

19°C

Hottest around day 4

Avg Low

11°C

Coolest around day 30

Rainy Days

4days

21% avg rain chance

Sunshine

8hrs/day

Autumn season

Travel Intelligence

Exclusive flight analytics & health data for London

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Airport-to-Airport Logistics

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Flight Connectivity Analysis

Airport traffic data & seasonal patterns

Major Hub

100/ 100

Traffic Index

Extremely busy airport

Peak Daily Arrivals

slots per day

Peak

Oct

Low

Jan

Monthly Traffic Distribution

650

Jan

657

Feb

662

Mar

736

Apr

739

May

2568

Jun

2601

Jul

2591

Aug

2479

Sep

2634

Oct

2238

Nov

2434

Dec

Traffic Level

Low Season

Key Connections

New York John F Kennedy (JFK)

Dublin (DUB)

Frankfurt-am-Main (FRA)

Amsterdam Schiphol (AMS)

Madrid Adolfo Suárez –Barajas (MAD)

Health & Safety Advisory

CDC travel health recommendations

8 Recommendations

COVID-19

All eligible travelers should be up to date with their COVID-19 vaccines. Please seeYour COVID-19 Vaccinationfor more information.

Hepatitis A

Consider hepatitis A vaccination for most travelers. It is recommended for travelers who will be doing higher risk activities, such as visiting smaller cities, villages, or rural areas where a traveler might get infected through food or water. It is recommended for travelers who plan on eating street food.

Hepatitis B

Recommended for unvaccinated travelers younger than 60 years old traveling to the United Kingdom. Unvaccinated travelers 60 years and older may get vaccinated before traveling to the United Kingdom.

Measles

Cases of measles are on the rise worldwide. Travelers are at risk of measles if they have not been fully vaccinated at least two weeks prior to departure, or have not had measles in the past, and travel internationally to areas where measles is spreading.All international travelers should be fully vaccinated against measles with the measles-mumps-rubella (MMR) vaccine, including an early dose for infants 6–11 months, according toCDC’s measles vaccination recommendations for international travel.

Polio

In the United Kingdom poliovirus has been identified in the past year.Travelers to the United Kingdom are at increased risk of exposure to poliovirus.Vaccine recommendations: Adults traveling to the United Kingdom who received a complete polio vaccination series as children may receive a single lifetime booster dose of inactivated polio vaccine; travelers who are unvaccinated or not fully vaccinated should receive a complete polio vaccination series before travel. Children who are not fully vaccinated will be considered for anaccelerated vaccination schedule.

Rabies

Dogs infected with rabies are not commonly found in the United Kingdom.If rabies exposures occur while in the United Kingdom, rabies vaccines are typically available throughout most of the country.Rabies pre-exposure vaccination considerations include whether travelers 1) will be performing occupational or recreational activities that increase risk for exposure to potentially rabid animals and 2) might have difficulty getting prompt access to safe post-exposure prophylaxis.Please consult with a healthcare provider to determine whether you should receive pre-exposure vaccination before travel.For more information, seecountry rabies status assessments.

+2 more

Source: CDC Travelers' Health

View Complete Health Guide

Is September a Good Time to Visit London?

👌A reasonable choice for your trip(64/100)

Short Answer

Popular September in London offers 19°C and 21% rain chance - excellent conditions that attract maximum visitors. Book 3-6 months ahead for best rates.

Decision Factors

Vaccinations required

Yellow Fever

Peak tourist season

94% of annual peak - expect crowds and peak prices

Health precautions needed

Be aware of: Leptospirosis, Hantavirus, Tuberculosis (TB)

Plenty of sunshine

8h of sunshine daily

Good For

🥾
Outdoor enthusiasts
Ideal hiking conditions: 19.2°C, 21% rain chance
🏛️
Cultural tourists
Comfortable conditions for exploring museums and sites
💑
Honeymoon couples
Wedding score 94/100 with romantic weather conditions
💼
Business travelers
Climate-controlled meetings unaffected by weather

Who Should Avoid

💰
Budget travelers
Peak season means premium prices everywhere
👴
Elderly travelers
78% humidity creates difficult conditions

"According to 30YearWeather's analysis of 30 years of NASA POWER satellite data,London in September averages 19°C with 21% precipitation probability."

📊 Source: 30YearWeather.com🛰️ Data: NASA POWER (1991-2021)View Methodology →

Frequently Asked Questions: London in September

What are the temperatures in London in September?

Daytime highs average 19°C, nights drop to 11°C. Temperatures remain fairly consistent.

How many rainy days in London in September?

Expect around 4 days with measurable rainfall. Rain is unlikely to disrupt plans.

What to wear in London in September?

Layers are key. A medium-weight jacket and closed-toe shoes.

Is September peak season in London?

This is typically peak season with higher prices. Book 2-3 months ahead.

London Weather in September

London September Weather Calendar