As Sulayyil climate — normals and trends
As Sulayyil (Saudi Arabia) has a hot desert climate (BWh) under the Köppen-Geiger classification. Its mean annual temperature is 27.0 °C and it receives 24 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (35.8 °C on average) and the coldest is January (16.4 °C). Rainfall peaks in April.
As Sulayyil averages 0 frost days, 242 hot days (≥ 30 °C) and 5 rainy days per year.
As Sulayyil has warmed by +3.7 °C between 1940 and 2025, or +0.44 °C per decade. This trend is statistically significant.
The hottest day of the period reached 47.2 °C (on 17 July 2010) and the coldest -3.5 °C (on 4 January 1973).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
As SulayyilRiyadh Region
- coords
- 20.46°, 45.58°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
27.0°C
Average daily high
33.7°C
Average daily low
19.7°C
Annual rainfall
24mm
Sunshine / day
11.3h
Mean relative humidity
25%
Average peak wind
19.1km/h
Seasonal range
19.4°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
242 d/yr
Rainy days (≥ 1 mm)
5 d/yr
Annual snowfall
0.0 cm
Average feels-like high
31.5 °C
Average feels-like low
16.6 °C
Average peak gust
32.9 km/h
Tropical nights (≥ 20 °C)
190 d/yr
Solar radiation
23.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+3.7 °C
since 1940
+0.4 °C per decade · r² = 0.84 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
47.2 °C
17 July 2010
Coldest day
-3.5 °C
4 January 1973
Wettest day
27 mm
23 March 1974
Windiest day
47.3 km/h
26 July 1967
Strongest gust
70.6 km/h
26 July 1967
Hottest feels-like
47.4 °C
13 August 2017
Coldest feels-like
-7.9 °C
4 January 1973
Sunniest day
12.2 h
19 May 1958
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 22.8 °C | -0.1 °C | 0 mm | -2 mm |
| Feb | 26.7 °C | +0.8 °C | 0 mm | -2 mm |
| Mar | 31.3 °C | +0.7 °C | 1 mm | -5 mm |
| Apr | 38.5 °C | +3.6 °C | 0 mm | -7 mm |
| May | 41.6 °C | +2.4 °C | 0 mm | -1 mm |
| Jun | 43.4 °C | +1.8 °C | 0 mm | 0 mm |
| Jul | 44.3 °C | +1.9 °C | 0 mm | -1 mm |
| Aug | 43.6 °C | +1.4 °C | 0 mm | -0 mm |
| Sep | 41.4 °C | +2.1 °C | 0 mm | 0 mm |
| Oct | 34.9 °C | +1.1 °C | 0 mm | -1 mm |
| Nov | 28.5 °C | +0.4 °C | 0 mm | -2 mm |
| Dec | 25.4 °C | +1.7 °C | 1 mm | -1 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of As Sulayyil?
As Sulayyil has a hot desert climate (Köppen BWh). Over 1940-2025, the average annual temperature is 27.0 °C and it receives 24 mm of precipitation per year.
What is the hottest day ever recorded in As Sulayyil?
The hottest day measured in As Sulayyil between 1940 and 2025 was 17 July 2010, reaching 47.2 °C.
What is the coldest day in As Sulayyil?
The coldest day measured in As Sulayyil between 1940 and 2025 was 4 January 1973, at -3.5 °C.
Does it snow in As Sulayyil?
Almost never: As Sulayyil sees virtually no snow, with about 0 frost days per year.
Has the climate of As Sulayyil warmed?
Yes: As Sulayyil warmed by +3.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in As Sulayyil?
The wettest day measured in As Sulayyil between 1940 and 2025 was 23 March 1974, with 27 mm of rain in 24 hours.
What was the windiest day in As Sulayyil?
The windiest day measured in As Sulayyil between 1940 and 2025 was 26 July 1967, with winds reaching 47.3 km/h.
What is the warmest month in As Sulayyil?
The warmest month in As Sulayyil is July (35.8 °C on average); the coldest is January (16.4 °C).
How much does it rain in As Sulayyil?
As Sulayyil receives on average 24 mm of precipitation per year, spread over about 5 rainy days.
Is it sunny in As Sulayyil?
As Sulayyil gets on average 11.3 hours of sunshine per day, roughly 4,125 hours per year over 1940-2025.
Are there tropical nights in As Sulayyil?
Yes: As Sulayyil has on average 190 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in As Sulayyil?
In As Sulayyil, between 1940 and 2025, the highest apparent temperature reached 47.4 °C on 13 August 2017, and the lowest was -7.9 °C on 4 January 1973.
Compare As Sulayyil with another city
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