Negombo is warm all year, but rain and sea conditions change a lot with the monsoons. This month-by-month guide uses long-term averages to help you choose the best time to visit, and explains what each season means for the beach and for boat trips on the lagoon.
In this guide
The quick answer
December to March is the best time to visit Negombo, with the least rain, sunny days and calmer seas. January and February are the driest months. The wettest months are May, October and November.
Negombo weather month by month
| Month | Avg rain (mm) | What to expect |
|---|---|---|
| January | 89 | Dry, sunny, calm sea. Peak season. |
| February | 69 | Driest month. Excellent for beach and boat trips. |
| March | 147 | Hot and mostly sunny, with occasional showers. |
| April | 231 | Hot and humid, with afternoon thunderstorms becoming more common. |
| May | 371 | Wettest month. South-west monsoon arrives; rough sea. |
| June | 224 | Monsoon season, frequent showers and rough sea. |
| July | 135 | Monsoon continues, but rain eases. Often sunny spells. |
| August | 109 | Fewer showers; sea still rough at times. |
| September | 160 | Changeable, with showers. |
| October | 348 | Second wet season, heavy afternoon rain. |
| November | 315 | Wet, with storms, improving towards the end of the month. |
| December | 147 | Rain eases; the dry season begins. |
Temperatures barely change: average highs are about 29–31°C all year, and nights stay warm at around 22–26°C. It is hottest from about February to May.
Understanding the monsoons
- North-east monsoon (about December to March): brings rain to the east and north of Sri Lanka, but this is the dry season on the west coast, including Negombo.
- First inter-monsoon (about March to May): hot, with afternoon thunderstorms.
- South-west monsoon (about May to September): brings rain and rough seas to the west coast. Many local fishermen fish in the lagoon instead of at sea during these months.
- Second inter-monsoon (about October to November): heavy afternoon rain across much of the island.
What the weather means for boat trips
The good news: our lagoon boat tours run all year. Negombo Lagoon is sheltered and shallow, so it stays calm even when the sea is rough. In the rainy months, showers often come in the afternoon, so morning tours tend to be drier. For the best sunsets, choose the Sunset Boat Tour between December and April.
What the weather means for the beach
The sea is calmest from about December to April. During the south-west monsoon, waves and currents can be strong and swimming is often unsafe. Always check conditions and follow local advice. See our guides to Negombo Beach and Negombo Beach Park.
What to pack
- Light, breathable clothing and a light rain jacket or umbrella (all year)
- Sun cream, sunglasses and a hat
- Insect repellent
- Modest clothing that covers shoulders and knees for churches and temples
Frequently asked questions
What is the best month to visit Negombo?
January and February are the driest months, and December to March is the best period overall.
What is the rainiest month in Negombo?
May is the wettest month on average, followed by October and November.
Can I take a boat tour in the rainy season?
Yes. Negombo Lagoon is sheltered and our tours run all year. Mornings are usually drier.
Is it hot in Negombo all year?
Yes. Average highs are around 29–31°C in every month.
Written by
Nalin Fernando
Nalin is the founder of Boat Tours Sri Lanka, a Negombo-based social enterprise that runs boat tours on the Negombo Lagoon with local guides. Nalin plans the tour routes and writes these guides from first-hand time on the lagoon, in the mangroves and around Negombo town.
