17.09
thu
thu
Day
81°F
NE 16 mph
Precip.
40%
40%
Night
81°F
NE 17 mph
Precip.
43%
43%
18.09
fri
fri
Day
81°F
NE 14 mph
Precip.
54%
54%
Night
82°F
NE 17 mph
Precip.
50%
50%
19.09
sat
sat
Day
82°F
NE 16 mph
Precip.
27%
27%
Night
81°F
NE 17 mph
Precip.
77%
77%
20.09
sun
sun
Day
81°F
NE 17 mph
Precip.
76%
76%
Night
81°F
NE 17 mph
Precip.
71%
71%
21.09
mon
mon
Day
81°F
NE 19 mph
Precip.
49%
49%
Night
81°F
NE 19 mph
Precip.
61%
61%
22.09
tue
tue
Day
81°F
NE 19 mph
Precip.
46%
46%
Night
82°F
NE 19 mph
Precip.
36%
36%
23.09
wed
wed
Day
82°F
NE 19 mph
Precip.
42%
42%
Night
82°F
NE 21 mph
Precip.
35%
35%
Sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 84.3°F. The highest and lowest sea temperatures during the month were 85.5°F and 83.1°F.
Sea water temperature in October, °F
Show year:
2025
2024
2023
The average sea water temperature in October of 2025 was 83.8°F. The highest and lowest sea temperatures during the month were 84.9°F and 82.9°F.
Air temperature in Negombo, °F
Precipitation total in Negombo, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Negombo
Negombo on a weather map
Places in Sri Lanka:
Name
°F
24 Hours Forecast
Negombo
Local time: 13:05
September 17, thursday
1500
81°F
NE
16 mph
16 mph
1800
81°F
NE
19 mph
19 mph
2100
81°F
NE
19 mph
19 mph
September 18, friday
0000
81°F
NE
17 mph
17 mph
0300
81°F
NE
16 mph
16 mph
0600
81°F
NE
14 mph
14 mph
0900
81°F
NE
14 mph
14 mph
1200
81°F
NE
14 mph
14 mph
