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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.
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).
Gampaha Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Gampaha - and find the best time to visit.
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 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.
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Swimming7/10 -
Cycling7/10 -
Walking7/10 -
Camping6/10 -
Outdoor sports7/10
Gampaha 3-Day Forecast
More climate data for Gampaha
Temperature Rainfall Sunshine Humidity
See the full Gampaha 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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