, hot all year round, with a relatively dry season in January and February and two very rainy periods, from April to June and from September to mid-December.
The city is located on the west coast of Sri Lanka, about 30 km (18 mi) north of Colombo.
We are in the rainiest part of the coast, the one that receives abundant rains even in the period that runs from April to June.
Temperatures are quite stable, however, during the day they are a bit higher from January to April. During this period, the temperature gradually increases, and with it showers and thunderstorms, which become frequent in April.
, which brings abundant rains especially in the first part (mid-May-mid-June) and in the last one (September). In fact, in July and August, the monsoon moves north and mainly affects India, while in Sri Lanka the rains are not very frequent, however, in Negombo and on the south-west coast, they still amount to around 80/100 mm (3.2/4 in) per month.
From October to mid-December, the rains are frequent and abundant because tropical depressions often form in Sri Lanka.
period, is the coolest of the year, especially in the first part, it is also a dry period because we are on the western side, protected by the mountains.
. Typically, on the Indian Ocean north of the Equator, cyclones occur from April to December, although Sri Lanka is usually only affected in November and December, and more rarely in May. In fact, usually in mid-May, sometimes there can be heavy rains, caused by cyclones that form in the Bay of Bengal, even if they are at the beginning of their life. However, since the sea is warm all year round, in theory they can also form from January to March, perhaps in a light form (such as tropical storms).
The best time to visit Negombo is from January to late February or mid-March, since it is the dry season.
In the months of July and August, there is another quite good period, in which the rains are relatively rare, however, this depends on the years, moreover, the sun shines less frequently and the sea is often rough, since the wind carried by the monsoon blows from the southwest.
. Here are the average temperatures.
January is generally a warm to hot, muggy month. The average temperature is of
27.1 °C, with a minimum of
22.2 °C and a maximum of
32 °C.

On the coldest nights of the month, the temperature usually drops to around
19 °C.

On the warmest days of the month, the temperature usually reaches around
34 °C.

Precipitation amounts to
53.6 mm, distributed over 4 days.
The day lasts on average 11 hours and 50 minutes.
The average humidity is 73%. Hence, the air is normally humid.
The average wind speed is of
14.8 kph.

The average sea temperature is of
27.6 °C. Therefore, the sea is pleasantly warm and allows long swims.
February is generally a very hot, muggy month. The average temperature is of
27.6 °C, with a minimum of
22.6 °C and a maximum of
32.7 °C.

On the coldest nights of the month, the temperature usually drops to around
20 °C.

On the warmest days of the month, the temperature usually reaches around
35.5 °C.

Precipitation amounts to
56.4 mm, distributed over 4 days.
The day lasts on average 11 hours and 55 minutes.
The average humidity is 72%. Hence, the air is normally humid.
The average wind speed is of
12.3 kph.

The average sea temperature is of
28 °C. Therefore, the sea is pleasantly warm and allows long swims.
March is generally a very hot, muggy month. The average temperature is of
28.2 °C, with a minimum of
23.8 °C and a maximum of
32.7 °C.

On the coldest nights of the month, the temperature usually drops to around
21.5 °C.

On the warmest days of the month, the temperature usually reaches around
35 °C.

Precipitation amounts to
105.1 mm, distributed over 7 days.
The day lasts on average 12 hours and 5 minutes.
The average humidity is 76%. Hence, the air is normally humid.
The average wind speed is of
9.7 kph.

The average sea temperature is of
28.9 °C. Therefore, the sea is pleasantly warm and allows long swims.
April is generally a very hot, muggy month. The average temperature is of
28.5 °C, with a minimum of
24.6 °C and a maximum of
32.4 °C.

On the coldest nights of the month, the temperature usually drops to around
22.5 °C.

On the warmest days of the month, the temperature usually reaches around
33.5 °C.

Precipitation amounts to
216.1 mm, distributed over 12 days.
The day lasts on average 12 hours and 20 minutes.
The average humidity is 80%. Hence, the air is normally humid.
The average wind speed is of
9.5 kph.

The average sea temperature is of
29.7 °C. Therefore, the sea is pleasantly warm and allows long swims.
May, the hottest month of the year, is generally a very hot, muggy month. The average temperature is of
28.6 °C, with a minimum of
25.6 °C and a maximum of
31.7 °C.

On the coldest nights of the month, the temperature usually drops to around
23.5 °C.

On the warmest days of the month, the temperature usually reaches around
33 °C.

Precipitation amounts to
281.3 mm, distributed over 15 days.
The day lasts on average 12 hours and 30 minutes.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is of
13.6 kph.

The average sea temperature is of
29.2 °C. Therefore, the sea is pleasantly warm and allows long swims.
June is generally a very hot, muggy month. The average temperature is of
28.2 °C, with a minimum of
25.6 °C and a maximum of
30.8 °C.

On the coldest nights of the month, the temperature usually drops to around
23.5 °C.

On the warmest days of the month, the temperature usually reaches around
32.5 °C.

Precipitation amounts to
157.9 mm, distributed over 14 days.
The day lasts on average 12 hours and 30 minutes.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is of
15.4 kph.

The average sea temperature is of
28.1 °C. Therefore, the sea is pleasantly warm and allows long swims.
July is generally a very hot, muggy month. The average temperature is of
28.1 °C, with a minimum of
25.6 °C and a maximum of
30.6 °C.

On the coldest nights of the month, the temperature usually drops to around
22.5 °C.

On the warmest days of the month, the temperature usually reaches around
31.5 °C.

Precipitation amounts to
91.7 mm, distributed over 8 days.
The day lasts on average 12 hours and 30 minutes.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is of
15.5 kph.

The average sea temperature is of
27.3 °C. Therefore, the sea is pleasantly warm and allows long swims.
August is generally a very hot, muggy month. The average temperature is of
28 °C, with a minimum of
25.5 °C and a maximum of
30.6 °C.

On the coldest nights of the month, the temperature usually drops to around
23.5 °C.

On the warmest days of the month, the temperature usually reaches around
31.5 °C.

Precipitation amounts to
96.9 mm, distributed over 8 days.
The day lasts on average 12 hours and 20 minutes.
The average humidity is 80%. Hence, the air is normally humid.
The average wind speed is of
15.7 kph.

The average sea temperature is of
27.2 °C. Therefore, the sea is pleasantly warm and allows long swims.
September is generally a very hot, muggy month. The average temperature is of
27.8 °C, with a minimum of
25 °C and a maximum of
30.7 °C.

On the coldest nights of the month, the temperature usually drops to around
23 °C.

On the warmest days of the month, the temperature usually reaches around
32 °C.

Precipitation amounts to
214.4 mm, distributed over 14 days.
The day lasts on average 12 hours and 5 minutes.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is of
13.8 kph.

The average sea temperature is of
27.6 °C. Therefore, the sea is pleasantly warm and allows long swims.
October is generally a warm to hot, muggy month. The average temperature is of
27.4 °C, with a minimum of
24.2 °C and a maximum of
30.6 °C.

On the coldest nights of the month, the temperature usually drops to around
22.5 °C.

On the warmest days of the month, the temperature usually reaches around
32 °C.

Precipitation amounts to
362.2 mm, distributed over 18 days.
The day lasts on average 12 hours and 0 minutes.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is of
10.6 kph.

The average sea temperature is of
28.1 °C. Therefore, the sea is pleasantly warm and allows long swims.
November is generally a warm to hot, muggy month. The average temperature is of
27.2 °C, with a minimum of
23.4 °C and a maximum of
30.9 °C.

On the coldest nights of the month, the temperature usually drops to around
21.5 °C.

On the warmest days of the month, the temperature usually reaches around
33.5 °C.

Precipitation amounts to
304.6 mm, distributed over 16 days.
The day lasts on average 11 hours and 50 minutes.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is of
9.2 kph.

The average sea temperature is of
28.5 °C. Therefore, the sea is pleasantly warm and allows long swims.
December, the least warm month of the year, is generally a warm to hot, muggy month. The average temperature is of
27 °C, with a minimum of
22.9 °C and a maximum of
31.1 °C.

On the coldest nights of the month, the temperature usually drops to around
20.5 °C.

On the warmest days of the month, the temperature usually reaches around
33 °C.

Precipitation amounts to
130.8 mm, distributed over 8 days.
The day lasts on average 11 hours and 40 minutes.
The average humidity is 78%. Hence, the air is normally humid.
The average wind speed is of
13 kph.

The average sea temperature is of
28 °C. Therefore, the sea is pleasantly warm and allows long swims.