Air Temperature

Highest Maximum 31.9°C 18th
Lowest Maximum 27.1°C 9th
Highest Minimum 26.0°C 18th 
Lowest Minimum 18.5°C 8th

 

Mean Maximum 28.9°C
Mean Minimum 22.8°C
Mean 25.9°C

 

Relative Humidity

Lowest Relative Humidity 47% 15th

 

Mean Relative Humidity 77.7%

 

Atmospheric Pressure

Highest Atmospheric Pressure 1023.2hPa 26th
Lowest Atmospheric Pressure 1012.5hPa 12th

 

Mean Atmospheric Pressure 1017.8hPa

 

Wind

Highest Gust 43.5km/h 11th

 

Mean Wind Speed 5.4km/h
Mean Gust Speed 13.3km/h
Mean Wind + Gust Speed 9.3km/h spójrz tutaj
Most Frequent Wind Direction North Northwest

 

Precipitation

Total Rainfall During September 2021 9.6 mm
Total Rainfall Since Last 01/09 9.6 mm

 

Highest 24 Hour Total 3.6 mm 4th

 

Rain Days 5 days
Thunderstorm Days 4 days
Hail Days 0 days

 

Rainfall Events

04/09/2021 3.6 mm Thunderstorm
06/09/2021 1.5 mm Isolated Thunderstorm
09/09/2021 2.6 mm Isolated Shower; Distant Thunder
10/09/2021 1.5 mm Isolated Shower; Distant Thunder
11/09/2021 0.4 mm Isolated Shower

 

September 2021 Compared to the Climate Means

  Climate Mean September 2021 Anomaly
Mean Maximum Temperature 28.3°C 28.9°C +0.6°C
Mean Minimum Temperature 20.8°C 22.8°C +2.0°C
Mean Temperature 24.6°C 25.9°C +1.3°C
Mean Relative Humidity 77% 77.7% +0.7%
Mean Atmospheric Pressure 1017.4hPa 1017.8hPa +0.4hPa
Mean Wind Speed 13.7 km/h 9.3 km/h -4.4km/h
Total Rainfall 55.5 mm 9.6 mm -45.9 mm
Total Rainfall Since Last 01/09 55.5 mm 9.6 mm -45.9 mm
Total Rain Days 4 days 5 days +1 day
Total Thunderstorm Days 3 days 4 days +1 day
Total Hail Days 1 day 0 days -1 day

 

Warmer and Drier in September 2021

Overall, October 2021 turned out to be significantly warmer than the climate norm. At 25.9°C, temperatures were 1.3°C warmer than the mean. Temperatures were above average on 19 days. This may be attributed to the central Mediterranean being covered by a persistent north African high pressure system. This fanned hot air from the Sahara Desert towards our region, maintaining air temperatures at an elevated level. The hottest day last month was on the 18th, when the mercury spiked to 31.9°C.

September 2021 was also drier than average. The 9.6 mm of rain measured last month all fell in the first week. This accounted for far less than a quarter of the climate mean. This was the result of anticyclonic conditions that prevailed over the central Mediterranean for a large part of the month. These acted as a barrier, which prevented low pressure systems from reaching the central Mediterranean.

The more stable meteorological conditions also meant weaker winds.

 

 

Rainfall Totals around the Maltese Islands in September 2021 (and since last September 1st):

Għarb – 9.6 mm (9.6 mm)

Marsalforn – 15.2 mm (15.2 mm)

Victoria – 18.4 mm (18.4 mm)

Xewkija – 14.8 mm (14.8 mm)

Nadur – 12.9 mm (12.9 mm)

Mellieħa – 16.8 mm (16.8 mm)

Buġibba – 34.3 (34.3 mm)

Naxxar – 34.3 mm (34.3 mm)

Dingli – 46.2 mm (46.2 mm)

Mġarr – 25.9 mm (25.9 mm)

Mosta – 25.0 mm (25.0 mm)

Msida – 22.8 mm (22.8 mm)

Sliema – 25.4 mm (25.4 mm)

Valletta – 21.1mm (21.1 mm)

Imqabba – 13.3 mm (13.3 mm)

Żabbar – 12.5 mm (12.5 mm)

Birżebbuġa – 12.1 mm (12.1 mm)

NATIONAL MEAN – 21.2 mm (21.2 mm)