What is the weather like in Colombo in September?

Expect temperatures between 25°C and 28°C with 77% average rain probability and about 8 hours of sunshine daily.

What is the weather like in Colombo in September?

Colombo in September scores 47/100 based on 30 years of climate data. Requires preparation but many visit successfully.

Who should visit Colombo in September?

September in Colombo is ideal for: Business travelers, Adventure seekers.

Colombo Weather in September | 30-Year Forecast

Avg High

28°C

Hottest around day 30

Avg Low

25°C

Coolest around day 1

Rainy Days

30days

77% avg rain chance

Sunshine

8hrs/day

Autumn season

Sea Temperature in September

Indian Ocean

28.8°C

Monthly Average

Water Feel

🌴Tropical

Perfect for swimming and water sports

Swim Rating

✅Excellent for swimming

Based on average sea surface temperature

Body of Water

Indian Ocean

Colombo coastline

Essential Travel Info for Colombo

🗓️ Best Time to Visit 📖 Travel Guide 🍴 Food Guide

Currency

LKR

Rs රු Sri Lankan rupee

Language

Sinhala

+1 more

Driving

Left side

Connect

SIM cards for unlocked phones may be pur...

Safety

Moderate Safety

GPI: 2.02

Travel Intelligence

Exclusive flight analytics & health data for Colombo

Smart Flight Estimator

Airport-to-Airport Logistics

unlock smart flight estimates

Add your home location in settings to see airport details.

Flight Connectivity Analysis

Airport traffic data & seasonal patterns

Low Traffic

37/ 100

Traffic Index

Quieter airport

Peak Daily Arrivals

slots per day

Peak

Jan

Low

Oct

Monthly Traffic Distribution

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Traffic Level

Low Season

Key Connections

Dubai (DXB)

Malé (MLE)

Chennai (MAA)

Doha Hamad (DOH)

Kuala Lumpur (KUL)

Health & Safety Advisory

CDC travel health recommendations

9 Recommendations

COVID-19

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

Chikungunya

There is anoutbreak of chikungunyain Sri Lanka.Chikungunya vaccinationis recommended for people traveling to an area with a chikungunya outbreak.

Hepatitis A

Recommended for unvaccinated travelers one year old or older going to Sri Lanka.Infants 6 to 11 months old should also be vaccinated against Hepatitis A. The dose does not count toward the routine 2-dose series.Travelers allergic to a vaccine component should receive a single dose of immune globulin, which provides effective protection for up to 2 months depending on dosage given.Unvaccinated travelers who are over 40 years old, are immunocompromised, or have chronic medical conditions planning to depart to a risk area in less than 2 weeks should get the initial dose of vaccine and at the same appointment receive immune globulin.

Hepatitis B

Recommended for unvaccinated travelers younger than 60 years old traveling to Sri Lanka. Unvaccinated travelers 60 years and older may get vaccinated before traveling to Sri Lanka.

Japanese Encephalitis

Recommended for travelers whoAre moving to an area with Japanese encephalitis to liveSpend long periods of time, such as a month or more, in areas with Japanese encephalitisFrequently travel to areas with Japanese encephalitisConsider vaccination for travelersSpending less than a month in areas with Japanese encephalitis but will be doing activities that increase risk of infection, such as visiting rural areas, hiking or camping, or staying in places without air conditioning, screens, or bed netsGoing to areas with Japanese encephalitis who are uncertain of their activities or how long they will be thereNot recommended for travelers planning short-term travel to urban areas or travel to areas with no clear Japanese encephalitis season.

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.

+3 more

Source: CDC Travelers' Health

View Complete Health Guide

Is September a Good Time to Visit Colombo?

🤔Requires preparation but many visit successfully(47/100)

Short Answer

Storm season alert for Colombo in September: beyond the 29°C, 77% rain averages, hurricane risk requires travel insurance and schedule flexibility.

Decision Factors

Cyclone season active

Indian Ocean zone - expect potential cyclone activity

Oppressive heat and humidity

28.5°C with 86% humidity - challenging conditions

High rainfall period

77% rain probability, 7.6mm average

Vaccinations required

Yellow Fever

Feels significantly hotter than 28.5°C

Heat index: 35°C due to 86% humidity

Warm tropical seas

28.8°C sea temperature - Tropical Bath

Good For

💼
Business travelers
Climate-controlled meetings unaffected by weather
🎯
Adventure seekers
1.6m waves - good for surfing and water sports

Who Should Avoid

💰
Budget travelers
Peak season means premium prices everywhere
👴
Elderly travelers
86% humidity creates difficult conditions
🥾
Outdoor enthusiasts
77% rain probability disrupts outdoor activities
📸
Photographers
84% cloud cover limits natural light opportunities

"According to 30YearWeather's analysis of 30 years of NASA POWER satellite data,Colombo in September averages 28°C with 77% precipitation probability."

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

Frequently Asked Questions: Colombo in September

What are the temperatures in Colombo in September?

Daytime highs average 28°C, nights drop to 25°C. Temperatures remain fairly consistent.

How many rainy days in Colombo in September?

Expect around 30 days with measurable rainfall. Definitely pack rain gear.

What to wear in Colombo in September?

Comfortable casual wear with a light jacket for evenings.

Is September peak season in Colombo?

This is off-peak season. Expect lower prices and fewer crowds.

Colombo Weather in September