Air Temperature

Highest Maximum 33.1°C 2nd
Lowest Maximum 25.1°C 27th
Highest Minimum 25.8°C 10th
Lowest Minimum 17.7°C 30th

 

Mean Maximum 28.8°C
Mean Minimum 21.4°C
Mean 25.1°C

 

Relative Humidity

Highest Relative Humidity 96% Numerous days
Lowest Relative Humidity 55% 2nd and 25th

 

Mean Relative Humidity 79.0%

 

Wind

Highest Gust 35.4km/h 10th

 

Mean Wind Speed 7.3km/h
Most Frequent Wind Direction South

 

Atmospheric Pressure

Highest Atmospheric Pressure 1024.7hPa 19th
Lowest Atmospheric Pressure 1012.4hPa 11th

 

Mean Atmospheric Pressure 1017.6hPa

 

Precipitation

Total Rainfall During September 2025 100.1 mm
Total Rainfall Since Last 01/09 100.1 mm

 

Highest 24 Hour Total 60.4 mm 24th

 

Rain Days 3 days
Thunderstorm Days 3 days
Hail Days 1 day

 

Rainfall Events

24/09/2025 60.4 mm Afternoon Isolated Thunderstorm; Evening Thunderstorm
26/09/2025 0.0 mm Distant Isolated Light Rain; Distant Thunder
27/09/2025 37.1 mm Morning Thunderstorm; Afternoon Thunderstorm with Hail
29/09/2025 2.6 mm Afternoon Isolated Shower

 

September 2025 Compared to the Climate Means

  Climate Mean September 2025 Anomaly
Mean Maximum Temperature 28.5°C 28.8°C  +0.3°C
Mean Minimum Temperature 21.6°C 21.4°C -0.2°C
Mean Temperature 25.0°C 25.1°C +0.1°C
Mean Relative Humidity 76.6% 79.0% +2.4%
Mean Atmospheric Pressure 1016.7hPa 1017.6hPa +0.9hPa
Total Rainfall 54.9 mm 100.1 mm +45.2 mm
Total Rainfall Since Last 01/09 54.9 mm 100.1 mm +45.2 mm
Total Rain Days 5 days 3 days -2 days
Total Thunderstorm Days 3 days 3 days /
Total Hail Days 0 days 1 day +1 day

 

Wetter in Gozo but Drier in Malta in September 2025

Temperatures in the first month of meteorological autumn were around average for the time of year. The mean temperature of 25.1°C was only a fraction of a degree above average. The slightly warmer days but slightly cooler nights contributed to this balance. The warmest day of the month, the 2nd, registered a maximum temperature 33.1°C. Temperatures declined gradually as the month progressed. Levels of relative humidity were overall higher than the norm, meaning realfeels were generally higher than the actual temperatures.

Precipitation patterns weren’t as straightforward. Last month was completely dry up until the 23rd. The first wave of autumn instability arrived late and lasted for much of the final week of September 2025. The 24th and the 27th were particularly stormy; producing 97.5 mm of the 100.1 mm measured at our Gozo weather station. Whilst Gozo experienced flash flooding in the usual localities on both days, Malta was left largely untouched by the heavy downpours on those days. Mean precipitation across Malta totalled 15.5 mm. This was very poor when compared to Gozo’s average of 103 mm. There were three rainy days. Thunder was heard on three days. Hail accompanied the afternoon thunderstorm on the 27th. The thunderstorm on the 27th brought a so-called ‘microburst’ (sudden torrential rain accompanied by strong wind) to localities across the southern half of Gozo.

September was marked by a notable absence of windy days, probably due to the intense high pressure which prevailed across the central Mediterranean for much of the month.

Rainfall Totals around the Maltese Islands in September 2025 (and since last September 1st):

Kerċem: 100.1 mm (100.1 mm)

Victoria: 107.3 mm (107.3 mm)

Marsalforn: 84.2 mm (84.2 mm)

Xewkija: 115.4 mm (115.4 mm)

Nadur: 105.2 mm (105.2 mm)

Għajnsielem: 105.9 mm (105.9 mm)

Mellieħa: 20.4 mm (20.4 mm)

Buġibba: 15.7 mm (15.7 mm)

Mġarr: 6.6 mm (6.6 mm)

Naxxar: 17.9 mm (17.9 mm)

Mosta: 14.0 mm (14.0 mm)

Dingli: 11.4 mm (11.4 mm)

Pembroke: 28.5 mm (28.5 mm)

Msida: 24.6 mm (24.6 mm)

Sliema: 29.8 mm (29,8 mm)

Valletta: 33.7 mm (33.7 mm)

Fgura: 3.3 mm (3.3 mm)

Żejtun: 9.9 mm (9.9 mm)

Żabbar: 10.8 mm (10.8 mm)

Imqabba: 8.5 mm (8.5 mm)

Siġġiewi: 10.0 mm (10.0 mm)

Żurrieq: 10.9 mm (10.9 mm)

Marsaxlokk: 8.2 mm (8.2 mm)

NATIONAL MEAN: 40.5 mm (40.5 mm)