Riyadh is 1.2°C (2.2°F) warmer by day, Ad Dammām has 5.1°C (9.2°F) warmer nights, and both get similar annual rainfall.
Ad Dammām is at its warmest in July and coolest in January, while Riyadh peaks in July and bottoms out in January. Month for month, Ad Dammām is the warmer of the two in 12 of 12 months.
Both collect a similar amount of rain over the year — 61 mm (2.4 in) in Ad Dammām and 48 mm (1.9 in) in Riyadh. The most comfortable time to visit is February, March and December in Ad Dammām and February, March and November in Riyadh.
| Ad Dammām | Metric | Riyadh |
|---|---|---|
| 🌡️ Temperature | ||
| 37°C | 🌡️Average daytime high | 38.2°C |
| 19.2°C | 🌙Average nighttime low | 14.1°C |
| July | 🔥Hottest month | July |
| January | ❄️Coldest month | January |
| 🌧️ Rain | ||
| 61 mm | 🌧️Annual rainfall | 48 mm |
| January | ☔Wettest month | March |
| June | 🏜️Driest month | June |
| 💨 Climate | ||
| 51% | 💧Average humidity | 25% |
| 3.5 m/s | 💨Average wind speed | 2.8 m/s |
Overnight, Ad Dammām typically falls to around 19.2°C (66.6°F) while Riyadh settles near 14.1°C (57.4°F).
Ad Dammām is hottest in July and coldest in January, whereas Riyadh peaks in July and is coolest in January.
Ad Dammām sees the most rain in January and the least in June; Riyadh is wettest in March and driest in June.
Ad Dammām feels the more humid of the two, averaging 51% relative humidity against 25%.
For Riyadh, the pick of the year is February, March and November.
Month by month, here is the coldest night, the average day and the hottest afternoon each city can expect. Switch Compare to read rainfall, humidity, wind or solar instead, and Period to move between the long-term 45-year average and any single year — the shading is a quick warm-to-cool guide.
| Month | Ad Dammām | Riyadh | ||||
|---|---|---|---|---|---|---|
| Min | Avg | Max | Min | Avg | Max | |
| January | 9.5 | 17.6❄️ | 25.8 | 1.7 | 14.9❄️ | 28.1 |
| February | 10.1 | 19.2 | 28.4 | 3.5 | 17.6 | 31.6 |
| March | 12.5 | 22.7 | 32.9 | 7.2 | 21.3 | 35.4 |
| April | 16.7 | 27.6 | 38.4 | 12.9 | 26.1 | 39.4 |
| May | 22.3 | 32.4 | 42.6 | 19.3 | 31.5 | 43.6 |
| June | 26 | 35 | 44 | 23.2 | 34.2 | 45.1 |
| July | 28.3 | 36.4 | 44.5 | 25.1 | 35.5🔥 | 45.8 |
| August | 28.7 | 36.5🔥 | 44.2 | 25 | 35.3 | 45.6 |
| September | 25.6 | 34.1 | 42.6 | 21.2 | 32.2 | 43.3 |
| October | 22.4 | 30.8 | 39.2 | 16.4 | 27.6 | 38.8 |
| November | 16.2 | 24.7 | 33.3 | 9.6 | 21.2 | 32.9 |
| December | 11.5 | 19.6 | 27.7 | 3.8 | 16.1 | 28.4 |
| Annual Avg | 19.2 | 28.1 | 37 | 14.1 | 26.1 | 38.2 |
Min / mean / max temperature (°C). 🔥 marks each city's hottest month, ❄️ its coldest; shading runs cool blue to warm red.
The same figures plotted out, so the shape of a typical year is easier to see than in a grid. Where the two lines run close together Ad Dammām and Riyadh feel alike; where they separate, they are genuinely different places to be.
Hover or tap any point to read the exact figures. Ad Dammām Riyadh
See how Ad Dammām and Riyadh stack up against other cities. Swipe for more.
Choose which city to keep, then search for any other city in our database — we'll build the comparison for you.
Quick answers to the questions people ask most when comparing Ad Dammām and Riyadh — each drawn straight from the climate figures above.
Riyadh is the warmer of the two. It averages daytime highs of 38.2°C (100.8°F) against 37°C (98.6°F) in Ad Dammām — roughly 1.2°C (2.2°F) warmer by day. Nights are milder in Ad Dammām, with average lows of 19.2°C (66.6°F) versus 14.1°C (57.4°F).
Ad Dammām is hottest in July, averaging highs of about 44.5°C (112.2°F), while Riyadh peaks in July at around 45.8°C (114.5°F). That makes Riyadh the hotter of the two at the height of summer.
Riyadh gets colder. In its coldest month (January) overnight lows average about 1.7°C (35°F), compared with 9.5°C (49.1°F) at the low point of the year in Ad Dammām.
They get a similar amount of rain over a year — about 61 mm (2.4 in) in Ad Dammām and 48 mm (1.9 in) in Riyadh. Ad Dammām is wettest in January and driest in June; Riyadh is wettest in March and driest in June.
Ad Dammām is the more humid of the two, averaging 51% relative humidity over the year against 25% in Riyadh.
The most comfortable months in Ad Dammām are February, March and December, when average temperatures are at their mildest.
Riyadh is at its most pleasant around February, March and November, based on the mildest average temperatures of the year.
Ad Dammām is the warmer city in all 12 months of the year. The gap is widest in November, about 3.5°C (6.3°F), and narrowest in June, about 0.8°C (1.4°F).
Riyadh has the bigger seasonal swing, about 20.6°C (37.1°F) between its coldest and hottest months versus 18.9°C (34°F) in Ad Dammām — so Ad Dammām has the steadier, more even climate.
On climate alone, Riyadh comes out ahead — it offers warmer days and lower humidity than Ad Dammām. Ad Dammām is the better fit only if you'd actually prefer cooler weather and a more humid climate.
Every figure on this page is calculated from NASA POWER satellite climate data spanning 1981–2025 (45 years). The averages describe the long-term climate of Ad Dammām and Riyadh, not a single year's weather or a short-range forecast.
