This page is a single place to check Colombo climate: monthly averages. Colombo runs from 25.4 C in Jan to 27.6 C in Apr, a swing of 2.2 C. Rain is spread through the year, with Nov the wettest month at 10.15 mm/day and Jan the driest at 2.44 mm/day. Taken together that is roughly 1,994 mm of rain a year for the grid cell. Every run re-reads the source and only rewrites this page when a figure actually changed. Scroll for the month-by-month figures, or jump to a neighbouring location from the links below.
Annual mean temperature 26.4 C
Warmest month Apr (27.6 C)
Coldest month Jan (25.4 C)
Wettest month Nov (10.15 mm/day)
All-time record high 35.5 C
All-time record low 18.2 C
Annual precipitation 1,997 mm / year
Coordinates 6.9355, 79.8487
Population 648,034
Average monthly temperature and rainfall in Colombo
Month
Mean temp (C)
Rain (mm/day)
Record high (C)
Record low (C)
Jan
25.4
2.44
33.6
18.2
Feb
26.2
2.51
34.2
19.0
Mar
27.4
3.70
35.5
21.1
Apr
27.6
7.52
34.1
23.6
May
27.3
7.21
32.1
23.8
Jun
26.6
4.78
30.5
23.8
Jul
26.1
3.19
30.2
23.2
Aug
26.1
3.64
30.2
23.3
Sep
26.2
5.40
30.9
23.4
Oct
26.2
9.41
31.9
22.1
Nov
26.1
10.15
31.3
20.7
Dec
25.6
5.65
31.5
18.9
What the Colombo climate table shows
Values are multi-decadal climatological averages for the 6.9355, 79.8487 grid cell, not a single year. Rain is the daily mean, so a value of 2.00 mm/day is about 60 mm across a 30-day month. Averages smooth over extremes, so use them for planning rather than for what to pack for next Tuesday.
Frequently asked questions
How much rain is 10.15 mm/day in a month?
Rain is recorded as a daily mean, so 10.15 mm/day is roughly 309 mm across a 30-day month.
Does Colombo get the same every year?
Close to it. Averaging decades smooths variation, so treat these as typical rather than guaranteed.