Everything below is collected in one spot so you do not have to cross-check Bilbao climate: monthly averages by hand. The gap between Feb and Aug is 11.3 C here: 9.8 C against 21.1 C. No month dominates: the wettest is Nov at 4.86 mm/day, the driest Jul at 1.14 mm/day. Taken together that is roughly 1,004 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. Exact monthly values are in the table; links below cover adjacent locations and years.
Annual mean temperature 15.0 C
Warmest month Aug (21.1 C)
Coldest month Feb (9.8 C)
Wettest month Nov (4.86 mm/day)
All-time record high 36.0 C
All-time record low -0.1 C
Annual precipitation 1,000 mm / year
Coordinates 43.26271, -2.92528
Population 347,342
Average monthly temperature and rainfall in Bilbao
Month
Mean temp (C)
Rain (mm/day)
Record high (C)
Record low (C)
Jan
10.0
4.07
19.8
2.3
Feb
9.8
3.46
20.2
1.0
Mar
11.2
3.03
21.4
0.9
Apr
12.8
2.65
25.2
6.7
May
15.1
2.08
28.2
7.8
Jun
18.2
1.87
33.8
11.8
Jul
20.3
1.14
34.5
13.8
Aug
21.1
1.16
36.0
15.1
Sep
19.7
1.78
31.2
12.9
Oct
17.2
3.05
27.8
7.1
Nov
13.1
4.86
23.6
5.3
Dec
10.8
3.87
18.9
-0.1
What the Bilbao climate table shows
Values are multi-decadal climatological averages for the 43.26271, -2.92528 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 4.86 mm/day in a month?
Rain is recorded as a daily mean, so 4.86 mm/day is roughly 148 mm across a 30-day month.