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Polonnaruwa Weather in September
September in Polonnaruwa brings extremely high temperatures, with daytime highs of 36°C (97°F) and nights around 26°C (79°F). Expect around 58 mm (2.3 in) of rainfall during the month.
Rainfall in Polonnaruwa in September
Historically, the month has about 9 days of rain, averaging 58 mm (2.3 in) in total. A fairly balanced picture this month, some wet days but nothing too extreme in terms of intensity.
Temperature in Polonnaruwa in September
Daytime highs in Polonnaruwa in September reach 36°C (97°F), with nights around 26°C (79°F). Sunshine and humidity can make it feel even warmer than the raw temperature suggests. With lows around 26°C (79°F), the nights are warm enough that a sheet is usually all you need for bedding.September in Polonnaruwa has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.
Polonnaruwa Temperature in September
Min Temperature
26°C (79°F)
Max Temperature
36°C (97°F)
Chance of Rain
29%
Precipitation
58 mm (2.3 in)
Rainy days
9 days
Polonnaruwa Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Polonnaruwa - and find the best time to visit.
Daily Historical Temperatures
45-year average (1976-2025)
Based on our historical records, temperatures in Polonnaruwa typically stay consistent throughout September, with daily highs averaging around 36°C (97°F). Nights are warm, with lows around 25°C (77°F).
Average temperatures in September
Daily Historical Precipitation
45-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather records for Polonnaruwa in September
Browse day-by-day weather records for Polonnaruwa spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Polonnaruwa historical weather extremes in September
Based on 22 years of weather observations in Polonnaruwa between 2004 and 2026, these are the recorded extremes.
- The hottest September day on record in Polonnaruwa reached 43°C (109°F) (September 12, 2026).
- Polonnaruwa experienced its chilliest September day on September 2, 2004, reaching only 25°C (77°F).
- Nighttime temperatures dropped to 22°C (72°F) on September 6, 2020, marking the coldest September night on record.
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
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Polonnaruwa in September
Get ready for hot weather in September! Lightweight, breathable fabrics are your best friend during this month. Cotton and linen shirts, shorts, sundresses, and sandals will keep you comfortable. Light colors help reflect the heat, avoid wearing black. Rain is likely on several days, so bring a good rain jacket.
What To Do in Polonnaruwa in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Camping7/10
Polonnaruwa 3-Day Forecast
More climate data for Polonnaruwa
See the full Polonnaruwa climate overview or explore weather in Sri Lanka.
Popular in September
Where to go in September - average daytime high across popular destinations.
Colombo
30°C (86°F) Galle29°C (84°F) Mirissa29°C (84°F) Hikkaduwa29°C (84°F) Negombo30°C (86°F) Kandy
29°C (84°F) Unawatuna29°C (84°F) Nuwara Eliya28°C (82°F) Bucket list
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