One page for Onitsha climate: monthly averages, sourced from public APIs and refreshed automatically. Expect 24.4 C at the coldest (Jan) and 26.8 C at the warmest (Mar) — a 2.4 C spread. Expect a wet season rather than rain year-round: Sep brings 10.50 mm/day against 0.38 mm/day in Jan. Taken together that is roughly 1,699 mm of rain a year for the grid cell. Values come from a public open API; a successful result is cached so a later outage never blanks the page. The table underneath carries the per-month breakdown; the related pages cover the same dataset nearby.
Annual mean temperature 25.6 C
Warmest month Mar (26.8 C)
Coldest month Jan (24.4 C)
Wettest month Sep (10.50 mm/day)
All-time record high 35.4 C
All-time record low 11.8 C
Annual precipitation 1,705 mm / year
Coordinates 6.14978, 6.78569
Population 1,553,000
Average monthly temperature and rainfall in Onitsha
Month
Mean temp (C)
Rain (mm/day)
Record high (C)
Record low (C)
Jan
24.4
0.38
33.1
11.8
Feb
26.2
1.03
35.4
13.6
Mar
26.8
1.95
33.8
18.7
Apr
26.8
4.10
33.2
20.9
May
26.4
5.40
32.6
21.7
Jun
25.5
7.57
31.8
21.4
Jul
24.9
7.46
31.1
19.9
Aug
24.8
7.82
31.0
19.7
Sep
25.0
10.50
31.1
20.6
Oct
25.4
6.78
31.3
20.9
Nov
25.9
2.42
32.3
17.6
Dec
24.9
0.47
32.3
13.7
What the Onitsha climate table shows
Values are multi-decadal climatological averages for the 6.14978, 6.78569 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 10.50 mm/day in a month?
Rain is recorded as a daily mean, so 10.50 mm/day is roughly 319 mm across a 30-day month.
Does Onitsha get the same every year?
Close to it. Averaging decades smooths variation, so treat these as typical rather than guaranteed.