September Weather in Moratuwa, Sri Lanka

Last updated: August 31, 2025

The average temperature in Moratuwa, Sri Lanka during September hovers around 27°C (81°F). Expect a minimum of 23°C (73°F) and a maximum of 31°C (89°F). However, be prepared for generous precipitation, with an average of 251 mm (9.9 in) spread over 28 days, and a humidity level that can feel quite tropical at 82%.

September Temperature in Moratuwa

In September, in Moratuwa, the average temperature is 27°C (81°F). The maximum can reach 31°C (89°F), while the minimum can drop to as low as 23°C (73°F). This warm climate makes Moratuwa a perfect destination for travelers seeking pleasant weather.

September Weather in Moratuwa: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Moratuwa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Moratuwa, September typically has an average temperature of 27°C (81°F), with highs reaching up to 31°C (89°F) and lows dropping to around 23°C (73°F).

Data source: Temperature data for Moratuwa generated using information from the Copernicus Climate Change Service.

September Precipitation in Moratuwa

In Moratuwa in September, the total precipitation amount is 251 mm (9.9 in) accumulated over the course of 28 days.

September Precipitation Trends in Moratuwa

The chart displays monthly precipitation patterns in Moratuwa, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Moratuwa, September typically receives around 251 mm (9.9 inches) of precipitation spread over approximately 28 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Moratuwa

In Moratuwa in September humidity is 82%. With an average temperature of 27°C (81°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities feel more exhausting, and leaving you longing for the relief of air-conditioned spaces during your travels.

September Average Humidity in Moratuwa

This chart illustrates the average monthly humidity levels in Moratuwa, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Moratuwa is approximately 82%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Moratuwa

In Moratuwa in September, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Moratuwa, you can check here.

Maximum UV Index Levels in Moratuwa for September

The chart shows the monthly maximum UV Index (UVI) for Moratuwa in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Moratuwa typically reaches 14, which falls under the extreme exposure category.

Data source: Moratuwa September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How September Weather in Moratuwa Compares to Other Months

Weather in Moratuwa varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Moratuwa, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Moratuwa, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	27°C (81°F)	87 mm (3.4 inches)	77%	extreme
February Weather	28°C (82°F)	87 mm (3.4 inches)	73%	extreme
March Weather	28°C (83°F)	159 mm (6.3 inches)	74%	extreme
April Weather	28°C (83°F)	154 mm (6.1 inches)	74%	extreme
May Weather	28°C (82°F)	306 mm (12.1 inches)	76%	extreme
June Weather	28°C (82°F)	287 mm (11.3 inches)	82%	extreme
July Weather	27°C (81°F)	212 mm (8.4 inches)	82%	extreme
August Weather	27°C (81°F)	249 mm (9.8 inches)	83%	extreme
September Weather	27°C (81°F)	251 mm (9.9 inches)	82%	extreme
October Weather	27°C (80°F)	352 mm (13.9 inches)	81%	extreme
November Weather	27°C (80°F)	323 mm (12.7 inches)	80%	extreme
December Weather	27°C (80°F)	207 mm (8.2 inches)	80%	very high