The climate of Saudi Arabia is marked by high temperatures during the day and low temperatures at night. The country follows the pattern of the desert climate, with the exception of the southwest, which features a subtropical highland climate and a semi-desert climate.
| Climate data for Haradh (1985-2010) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °C (°F) | 33.0 (91.4) | 35.0 (95.0) | 38.0 (100.4) | 42.0 (107.6) | 46.0 (114.8) | 47.5 (117.5) | 48.4 (119.1) | 49.8 (121.6) | 46.8 (116.2) | 42.5 (108.5) | 38.0 (100.4) | 32.7 (90.9) | 49.8 (121.6) |
| Mean daily maximum °C (°F) | 20.2 (68.4) | 23.4 (74.1) | 27.7 (81.9) | 33.4 (92.1) | 39.4 (102.9) | 42.5 (108.5) | 43.5 (110.3) | 43.6 (110.5) | 40.4 (104.7) | 35.3 (95.5) | 27.8 (82.0) | 22.2 (72.0) | 33.3 (91.9) |
| Daily mean °C (°F) | 14.4 (57.9) | 17.3 (63.1) | 21.4 (70.5) | 26.9 (80.4) | 32.9 (91.2) | 35.7 (96.3) | 36.8 (98.2) | 36.7 (98.1) | 33.5 (92.3) | 28.4 (83.1) | 21.5 (70.7) | 16.3 (61.3) | 26.8 (80.3) |
| Mean daily minimum °C (°F) | 9.0 (48.2) | 11.2 (52.2) | 15.2 (59.4) | 20.4 (68.7) | 25.9 (78.6) | 28.0 (82.4) | 29.3 (84.7) | 29.2 (84.6) | 25.9 (78.6) | 21.2 (70.2) | 15.5 (59.9) | 10.6 (51.1) | 20.1 (68.2) |
| Record low °C (°F) | −5.4 (22.3) | −3.3 (26.1) | 2.4 (36.3) | 8.9 (48.0) | 15.7 (60.3) | 19.8 (67.6) | 20.0 (68.0) | 20.0 (68.0) | 14.4 (57.9) | 8.9 (48.0) | 4.5 (40.1) | −2.0 (28.4) | −5.4 (22.3) |
| Average precipitation mm (inches) | 12.5 (0.49) | 8.0 (0.31) | 24.0 (0.94) | 28.0 (1.10) | 4.9 (0.19) | 3.0 (0.12) | 3.7 (0.15) | 4.0 (0.16) | 0.1 (0.00) | 0.8 (0.03) | 8.7 (0.34) | 14.6 (0.57) | 112.3 (4.4) |
| Average rainy days | 6.1 | 4.3 | 9.4 | 11.3 | 3.3 | 0.0 | 0.1 | 0.2 | 0.0 | 0.5 | 3.3 | 6.3 | 44.8 |
| Average relative humidity (%) | 47 | 36 | 32 | 28 | 17 | 11 | 10 | 12 | 14 | 20 | 36 | 47 | 26 |
| Average dew point °C (°F) | 2 (36) | 1 (34) | 2 (36) | 4 (39) | 3 (37) | −1 (30) | 0 (32) | 2 (36) | 2 (36) | 2 (36) | 4 (39) | 3 (37) | 2 (36) |
| Mean monthly sunshine hours | 212.4 | 226.6 | 219.8 | 242.3 | 287.7 | 328.2 | 332.1 | 309.2 | 271.6 | 311.4 | 269.2 | 214.3 | 3,224.8 |
| Percent possible sunshine | 63 | 71 | 59 | 63 | 70 | 80 | 80 | 77 | 74 | 87 | 82 | 65 | 72 |
| Average ultraviolet index | 3 | 7 | 9 | 11 | 12 | 122 | 20 | 18 | 11 | 8 | 6 | 0 | 19 |
| Source 1: "Jeddah Regional Climate Centre South West Asia". Archived from the original on 11 December 2016. Retrieved 27 May 2015. | |||||||||||||
| Source 2: Time and Date (dewpoints, 1985-2015) | |||||||||||||