Unawatuna Weather in September
September in Unawatuna averages 29°C (84°F) during the day and 26°C (79°F) at night. September is part of the rainy season, with around 262 mm (10 in) of rainfall and frequent showers.
Rainfall in Unawatuna in September
As part of the rainy season, Unawatuna sees around 12 days of rain in September, with an average of 262 mm (10 in). Rainy season showers here are typically intense, often clearing quickly but coming down hard while they last.
Temperature in Unawatuna in September
Temperatures in Unawatuna in September top out at 29°C (84°F) and drop to 26°C (79°F) overnight. Overall, the month follows a fairly predictable daily temperature pattern. At 26°C (79°F) overnight, it stays warm after dark. Light, breathable clothing and good airflow in your room make a noticeable difference.
Sunshine in Unawatuna in September
You can expect a moderate amount of sunlight, with approximately 180 hours. Even though this month is part of the wet season, you can still see the sun occasionally.If you prefer dry days with pleasant temperatures, September may not be the ideal month to visit Unawatuna. 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 Unawatuna's climate page.
Unawatuna Temperature in September
Min Temperature
26°C (79°F)
Max Temperature
29°C (84°F)
Chance of Rain
40%
Precipitation
262 mm (10 in)
Rainy days
12 days
Sunshine
180 hours *
Percentage Sunshine
*
Historical weather for Unawatuna in September
Browse day-by-day weather records for Unawatuna spanning 25 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Unawatuna historical weather extremes in September
Based on 21 years of weather observations in Unawatuna between 2004 and 2025, these are the recorded extremes.
- The warmest day in September was on September 17, 2020, with a maximum of 37°C (99°F).
- On September 6, 2004, Unawatuna saw its coldest September day with temperatures maxing out at 26°C (79°F).
- The coldest night in September in Unawatuna was on September 26, 2022, with a minimum of 14°C (57°F).
- The wettest day in September Unawatuna was on September 5, 2017 with 133 mm (5.2 in) of precipitation.
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
What to Wear in Unawatuna in September
Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Also bring a poncho, it will rain a lot! Waterproof everything you can. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Unawatuna 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 Unawatuna's climate page.
See the full Unawatuna climate overview or explore weather in Sri Lanka.
