A consolidated reference for Bissau climate: monthly averages, rebuilt from public data on a schedule. Expect 22.9 C at the coldest (Jan) and 29.3 C at the warmest (May) — a 6.4 C spread. Expect a wet season rather than rain year-round: Aug brings 15.71 mm/day against 0.00 mm/day in Feb. Taken together that is roughly 1,541 mm of rain a year for the grid cell. The build runs on a schedule and caches the last good response, so the numbers stay put even when the upstream API is having a bad day. Use the table for exact numbers, or the related pages below for neighbouring locations and periods.
Annual mean temperature 26.5 C
Warmest month May (29.3 C)
Coldest month Jan (22.9 C)
Wettest month Aug (15.71 mm/day)
All-time record high 41.6 C
All-time record low 10.7 C
Annual precipitation 1,555 mm / year
Coordinates 11.86357, -15.59767
Population 439,704
Average monthly temperature and rainfall in Bissau
Month
Mean temp (C)
Rain (mm/day)
Record high (C)
Record low (C)
Jan
22.9
0.02
37.3
10.7
Feb
25.0
0.00
39.0
12.9
Mar
27.3
0.01
40.4
14.4
Apr
28.8
0.01
41.6
18.5
May
29.3
0.67
41.4
21.0
Jun
28.2
4.39
39.1
22.0
Jul
26.7
12.11
33.2
23.1
Aug
26.2
15.71
34.1
23.3
Sep
26.4
11.83
31.9
22.4
Oct
27.1
5.57
33.3
20.8
Nov
26.3
0.38
37.4
16.2
Dec
23.7
0.00
37.7
12.3
What the Bissau climate table shows
Values are multi-decadal climatological averages for the 11.86357, -15.59767 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
Why do the numbers differ from a weather app?
An app shows one location on one day. These are long-run averages, so they smooth out single hot or cold spells.
How much rain is 15.71 mm/day in a month?
Rain is recorded as a daily mean, so 15.71 mm/day is roughly 478 mm across a 30-day month.