Mount Lavinia Weather in September
Mount Lavinia in September sees very high daytime temperatures of 30°C (86°F) and nighttime lows of 25°C (77°F). As part of the rainy season, showers are frequent and often heavy. Budget around 264 mm (10 in) of rainfall for the month.
Rainfall in Mount Lavinia in September
As part of the rainy season, Mount Lavinia sees around 14 days of rain in September, with an average of 264 mm (10 in). With high rainfall totals spread across the month, individual showers can be very heavy. Waterproof gear is strongly recommended.
Temperature in Mount Lavinia in September
September in Mount Lavinia brings very high temperatures, with highs of 30°C (86°F) and nights around 25°C (77°F). If you're spending a lot of time outdoors, it helps to plan around the warmer part of the day. Nights are warm at 25°C (77°F). It's worth making sure your accommodation has decent ventilation or air conditioning.
Sunshine in Mount Lavinia in September
With about 189 hours of sunshine, the area enjoys a nice balance of sun and rainy moments, creating a pleasant environment.
Wind Speed in Mount Lavinia in September
September sees wind speeds averaging 2 m/s (4 knots). You'll typically experience pleasant light breezes that move leaves slightly and feel refreshing. As an average, expect variation from very calm days to periods with more apparent air movement.
Average water temperature in September
The water is 28°C (82°F) this month — warm enough that getting in requires no effort at all. Good conditions for swimming, snorkeling, or just floating around.If you prefer dry days with pleasant temperatures, September may not be the ideal month to visit Mount Lavinia. Our weather planner can help you explore destinations with more pleasant weather conditions.
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 Mount Lavinia's climate page.
Mount Lavinia Temperature in September
Min Temperature
25°C (77°F)
Max Temperature
30°C (86°F)
Water Temperature
28°C (82°F) *
Chance of Rain
45%
Precipitation
264 mm (10 in)
Rainy days
14 days
Humidity
76% *
Windspeed
2 m/s (4 knots) *
Sunshine
189 hours *
Percentage Sunshine
*
Daily Historical Temperatures
46-year average (1976-2025)
Based on our historical records, temperatures in Mount Lavinia 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 Mount Lavinia in September
Browse day-by-day weather records for Mount Lavinia spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Mount Lavinia historical weather extremes in September
Based on 27 years of weather observations (1998-2025), these are the most extreme conditions recorded in Mount Lavinia.
- The hottest September day on record in Mount Lavinia reached 35°C (95°F) (September 24, 2013).
- Mount Lavinia experienced its chilliest September day on September 24, 2000, reaching only 25°C (77°F).
- The coldest night in September in Mount Lavinia 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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tolerable
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What to Wear in Mount Lavinia in September
Warm but pleasant conditions in Mount Lavinia 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. The water temperature sits at about 28°C (82°F), making it perfect for swimming and water activities. Don't forget to pack your favorite swimwear and perhaps some snorkel gear. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Mount Lavinia 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 Mount Lavinia's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Mount Lavinia climate overview or explore weather in Sri Lanka.
