Negombo Weather in September
September in Negombo averages 30°C (86°F) during the day and 26°C (79°F) at night. September is part of the rainy season, with around 245 mm (9.6 in) of rainfall and frequent showers.
Rainfall in Negombo in September
Negombo is in the rainy season in September, with rain on around 12 days and an average of 245 mm (9.6 in). With high rainfall totals spread across the month, individual showers can be very heavy. Waterproof gear is strongly recommended.
Temperature in Negombo in September
Negombo in September gets highs of 30°C (86°F) during the day and drops to 26°C (79°F) at night. Conditions stay fairly consistent through the month, making it easier to plan what to wear. With overnight lows of 26°C (79°F), evenings and nights remain warm. Light clothing and an open window or fan can help you sleep comfortably.
Sunshine in Negombo in September
The month experiences a moderate amount of sunlight, with 189 hours of sunshine. This provides a nice balance between sunshine and rain.Our weather planner can help you find worldwide destinations with pleasant weather during this period. January and February typically offer the best weather for Negombo.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Sri Lanka, check out our Negombo's climate page.
Negombo Temperature in September
Min Temperature
26°C (79°F)
Max Temperature
30°C (86°F)
Chance of Rain
39%
Precipitation
245 mm (9.6 in)
Rainy days
12 days
Humidity
76% *
Sunshine
189 hours *
Percentage Sunshine
*
Daily Historical Temperatures
46-year average (1976-2025)
Based on our historical records, temperatures in Negombo typically stay consistent throughout September, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 26°C (79°F).
Average temperatures in September
Daily Historical Precipitation
46-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Negombo in September
Browse day-by-day weather records for Negombo spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Negombo historical weather extremes in September
Our historical data for Negombo spans 1998 to 2025, revealing these weather extremes.
- Negombo recorded its highest September temperature of 34°C (93°F) on September 18, 2019.
- On September 24, 2000, Negombo saw its coldest September day with temperatures maxing out at 25°C (77°F).
- The coldest night in September in Negombo was on September 9, 2007, with a minimum of 22°C (72°F).
Best Places in Sri Lanka in September
Find out more about the weather in Sri Lanka and which places have the best travel conditions in this month. See all of Sri Lanka in September →
perfect weather
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What to Wear in Negombo in September
Warm but pleasant conditions in Negombo in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. It's going to pour! Pack a good poncho and prepare for very wet conditions. Sunglasses could come in handy during the sunnier parts of your trip.What To Do in Negombo in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Sri Lanka, check out our Negombo's climate page.
Temperature Rainfall Sunshine Humidity
See the full Negombo climate overview or explore weather in Sri Lanka.
