Monthly Climate
Menu

Ar Rayyān weather in September

In September, Ar Rayyān has daytime highs averaging 40 °C, nights around 26 °C, with 0 wet days, and a sea temperature of 33 °C. Figures are 1991–2020 climate normals.

  1. Jan 17°
  2. Feb 18°
  3. Mar 22°
  4. Apr 27°
  5. May 32°
  6. Jun 35°
  7. Jul 36°
  8. Aug 35°
  9. Sep 33°
  10. Oct 29°
  11. Nov 24°
  12. Dec 19°

Daily temperatures through September

22°33°44°18152229
Daily highDaily low Day of month on the horizontal axis. Highs peak at 41.6 °C and lows bottom out at 24.9 °C.

How September develops

Averages for the first, middle and last part of the month, from daily 1991–2020 normals. Chance of rain is the share of years in which that calendar day recorded more than 1 mm.

DaysAvg highAvg lowChance of rain
1–10 September40.8 °C27.4 °C0 %
11–20 September39.8 °C26.2 °C0 %
21–30 September38.7 °C25.2 °C0 %
0%50%100%151015202530
Chance of a wet day (over 1 mm) by date in September. Wettest date over the 30 years: September 1, at 0 %. Single dates are noisy — read the shape, not the spikes.

What to expect

Measure Typical September Share of the month
Days above 25 °C 30 of 30 100 %
Days above 30 °C 30 of 30 100 %
Days below 0 °C 0 of 30 0 %
Days with more than 1 mm rain 0 of 30 0 %

Conditions in September

MeasureAverage
Mean temperature 33 °C
Record high (1991–2020) 47 °C
Record low (1991–2020) 20 °C
Relative humidity 55 %
Wind speed 20 km/h
Cloud cover 4 %

Where Ar Rayyān ranks in September

RankingPositionValue
Warmest sea temperatures in Asia in September4thof 5033 °C
Warmest sea temperatures in the world in September4thof 5033 °C
The driest places in Asia in September15thof 500.08 mm
The warmest places in Asia in September24thof 5040 °C
The warmest places in the world in September24thof 5040 °C
The driest places in the world in September30thof 500.08 mm

September compared with the months around it

Month Avg high Rainfall Cloud
July 42.4 °C under 1 mm 13 %
August 42.2 °C under 1 mm 11 %
September 39.7 °C under 1 mm 4 %
October 35.5 °C under 1 mm 8 %
November 29.0 °C 8 mm 20 %

See all twelve months for Ar Rayyān

Nearby destinations in September

Destination Avg high Wet days Sea
Ar Rayyān 40 °C 0 33
Doha 39 °C 0 33
Lusail 38 °C 0 33
Al Muharraq 35 °C 0 33
Dammam 38 °C 0 32
Al Hufūf 41 °C 0 –
Al Jubayl 39 °C 0 32
Abu Dhabi 38 °C 0 33
Musaffah 40 °C 0 –

QuestionsSeptember in Ar Rayyān, answered

How warm is Ar Rayyān in September?

Daily highs average 40 °C and nights fall to about 26 °C, a spread of 14 °C between afternoon and dawn. That makes September the 4th warmest month of the year here.

Does it rain much in Ar Rayyān in September?

September averages under 1 mm of rain, spread over about 0 of the 30 days — 0 % of the month. Cloud cover averages 4 % of the sky.

Is the sea warm enough to swim in September?

The sea averages 33 °C off Ar Rayyān in September. Most people find water below 20 °C bracing and above 25 °C comfortable for a long swim; this figure is a monthly surface average, so a sheltered bay on a still afternoon can be warmer.

How long are the days in September?

Ar Rayyān averages 12 hours between sunrise and sunset in September. Day length is computed from latitude and date, so it is exact rather than modelled — but it says nothing about how much of that time is sunny.

Data sources and method

Normal period
1991–2020
Dataset version
era5-1991-2020-scores1.1
Last processed

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: daylight hours, beach and comfort scores, monthly rankings, threshold day counts, chance of a wet day by date, ten-day averages within the month. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.