Gampaha Weather in September

During September, Gampaha experiences very high daytime temperatures of 31°C (88°F) and cooler nights around 25°C (77°F). September sits within the rainy season, so expect regular and often heavy rainfall.

Rainfall in Gampaha in September

As part of the rainy season, Gampaha sees around 13 days of rain in September, with an average of 263 mm (10 in). Rainy season showers here are typically intense, often clearing quickly but coming down hard while they last.

Temperature in Gampaha in September

In September, expect very high temperatures in Gampaha, with highs of 31°C (88°F) and lows of 25°C (77°F) at night. Sunshine and humidity can make it feel even warmer than the raw temperature suggests. With lows around 25°C (77°F), the nights are warm enough that a sheet is usually all you need for bedding.

Sunshine in Gampaha in September

The area enjoys a balanced 189 hours of sunlight, ensuring it's neither too rainy nor too sunny.

September in Gampaha has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations in the world.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Sri Lanka, check out our Gampaha's climate page.

Gampaha Temperature in September

Min Temperature 25°C (77°F)  

Max Temperature 31°C (88°F)  

Chance of Rain 44%  

Precipitation 263 mm (10 in)  

Rainy days 13 days  

Humidity 76% *  

Sunshine 189 hours *  

Percentage Sunshine *  

* Data from: Colombo, Sri Lanka (25 KM, 15 Miles).

What to Wear in Gampaha 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. Sunglasses could come in handy during the sunnier parts of your trip.

What To Do in Gampaha in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

7/10

Cycling

7/10

Walking

7/10

Camping

6/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Sri Lanka, check out our Gampaha's climate page.

More climate data for Gampaha

Temperature Rainfall Sunshine Humidity

See the full Gampaha climate overview or explore weather in Sri Lanka.