A consolidated reference for Jeddah climate: monthly averages, rebuilt from public data on a schedule. Expect 23.4 C at the coldest (Jan) and 34.5 C at the warmest (Jul) — a 11.1 C spread. Expect a wet season rather than rain year-round: Nov brings 0.40 mm/day against 0.01 mm/day in Jul. Taken together that is roughly 38 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. Use the table for exact numbers, or the related pages below for neighbouring locations and periods.
Annual mean temperature 29.9 C
Warmest month Jul (34.5 C)
Coldest month Jan (23.4 C)
Wettest month Nov (0.40 mm/day)
All-time record high 49.1 C
All-time record low 12.1 C
Annual precipitation 36 mm / year
Coordinates 21.4901, 39.1862
Population 4,697,000
Average monthly temperature and rainfall in Jeddah
Month
Mean temp (C)
Rain (mm/day)
Record high (C)
Record low (C)
Jan
23.4
0.22
34.5
12.1
Feb
24.6
0.03
37.7
13.2
Mar
26.7
0.03
39.5
13.8
Apr
29.8
0.16
42.0
16.7
May
32.8
0.06
46.4
18.8
Jun
34.1
0.03
49.1
23.5
Jul
34.5
0.01
48.4
25.3
Aug
34.3
0.01
48.3
26.1
Sep
33.6
0.04
46.1
25.1
Oct
31.6
0.10
43.4
21.4
Nov
28.2
0.40
39.1
14.4
Dec
25.3
0.15
36.2
13.9
What the Jeddah climate table shows
Values are multi-decadal climatological averages for the 21.4901, 39.1862 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 0.40 mm/day in a month?
Rain is recorded as a daily mean, so 0.40 mm/day is roughly 12 mm across a 30-day month.