Colombo in September
In September, Colombo averages 30°C (86°F) during the day and 25°C (77°F) at night, with frequent rain — about 16 days of the month see precipitation (170 mm total).
ShoulderConditions are warm and beach-friendly. Expect daily rain or showers, often in heavy bursts.
September offers comfortable temperatures in Colombo, with some rain to plan around.
How September compares to the rest of the year in Colombo
September is in the middle of the year for warmth in Colombo (7th of 12) and moderately rainy compared to the rest of the year (5th of 12). Daytime temperature matches the city's annual average. September runs 1°C warmer than August (29°C) and stays flat into October.
September sunrise & sunset in Colombo
Times shown for Colombo local time (Asia/Colombo), calculated for the 15th of September. They shift by a few minutes day to day across the month.
Photography light in Colombo — September
Golden-hour and blue-hour windows for the 15th of September, in Colombo's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Colombo in September
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on September's tier (Shoulder) and Colombo's popularity.
Crowds & pricing — September in Colombo
Colombo is in a shoulder season month — fewer crowds, slightly lower prices, and a calmer atmosphere than peak weeks. Most major sights stay open with normal hours, though a handful of seasonal restaurants or boat trips may run reduced schedules. Many regulars consider these months the best time to visit because you trade a small amount of weather reliability for a much more pleasant on-the-ground experience.
Sun & mosquito risk — September in Colombo
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Colombo in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 31°C / 88°F | 22°C / 72°F | 75 mm | 8 | 0 |
| February | 31°C / 88°F | 22°C / 72°F | 65 mm | 6 | 0 |
| March | 32°C / 90°F | 23°C / 73°F | 135 mm | 10 | 0 |
| April | 32°C / 90°F | 24°C / 75°F | 235 mm | 15 | 0 |
| May | 31°C / 88°F | 25°C / 77°F | 395 mm | 21 | 0 |
| June | 30°C / 86°F | 25°C / 77°F | 225 mm | 19 | 0 |
| July | 29°C / 84°F | 25°C / 77°F | 135 mm | 15 | 0 |
| August | 29°C / 84°F | 25°C / 77°F | 115 mm | 15 | 0 |
| September | 30°C / 86°F | 25°C / 77°F | 170 mm | 16 | 0 |
| October | 30°C / 86°F | 24°C / 75°F | 360 mm | 21 | 0 |
| November | 30°C / 86°F | 23°C / 73°F | 330 mm | 18 | 0 |
| December | 30°C / 86°F | 23°C / 73°F | 165 mm | 12 | 0 |
Other cities with similar September weather
🌍 See the full ranked list of climate twins for Colombo in September →
Frequently asked questions
How hot is Colombo in September?
In September, Colombo averages a high of 30°C (86°F) and a low of 25°C (77°F) — generally hot.
Does it rain a lot in Colombo in September?
September is quite rainy in Colombo, with about 16 rainy days on average.
Is September a good time to visit Colombo?
September is hot but on the rainy side. It suits travelers who are comfortable with hot weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Colombo in September?
Pack lightweight, breathable clothing, sunglasses and sunscreen, plus a compact umbrella or rain jacket. See the full September packing list for Colombo for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.