If you only need Riyadh climate: monthly averages, the figures and table here are the whole story. Riyadh runs from 13.8 C in Jan to 36.0 C in Jul, a swing of 22.2 C. Rain is strongly seasonal: Nov is the wettest month at 0.23 mm/day, while Jun runs at 0.00 mm/day, about 2x drier. Taken together that is roughly 32 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 26.0 C
Warmest month Jul (36.0 C)
Coldest month Jan (13.8 C)
Wettest month Nov (0.23 mm/day)
All-time record high 47.5 C
All-time record low -2.8 C
Annual precipitation 33 mm / year
Coordinates 24.6877, 46.7219
Population 4,205,961
Average monthly temperature and rainfall in Riyadh
Month
Mean temp (C)
Rain (mm/day)
Record high (C)
Record low (C)
Jan
13.8
0.18
32.2
-2.8
Feb
16.6
0.13
34.8
-1.2
Mar
21.2
0.08
39.0
3.0
Apr
26.5
0.18
41.9
9.5
May
32.0
0.03
45.0
15.6
Jun
34.5
0.00
46.7
21.5
Jul
36.0
0.00
47.5
23.9
Aug
35.7
0.00
47.2
23.8
Sep
32.4
0.00
45.5
18.4
Oct
27.1
0.01
41.8
14.8
Nov
20.4
0.23
35.7
4.4
Dec
15.1
0.20
30.2
-0.7
What the Riyadh climate table shows
Values are multi-decadal climatological averages for the 24.6877, 46.7219 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 0.23 mm/day in a month?
Rain is recorded as a daily mean, so 0.23 mm/day is roughly 7 mm across a 30-day month.