Air Temperature
| Highest Maximum | 31.4°C | 19th |
| Lowest Maximum | 25.5°C | 25th |
| Highest Minimum | 25.0°C | 22nd |
| Lowest Minimum | 18.1°C | 26th |
| Mean Maximum | 28.4°C |
| Mean Minimum | 21.3°C |
| Mean | 24.9°C |
Relative Humidity
| Highest Relative Humidity | 94% | Numerous days |
| Lowest Relative Humidity | 21% | 17th |
| Mean Relative Humidity | 75.1% |
Wind
| Highest Gust | 43.5km/h | 23rd |
| Mean Wind Speed | 9.6km/h |
| Most Frequent Wind Direction | Northwest |
Atmospheric Pressure
| Highest Atmospheric Pressure | 1021.7hPa | 30th |
| Lowest Atmospheric Pressure | 1008.0hPa | 5th |
| Mean Atmospheric Pressure | 1016.1hPa |
Precipitation
| Total Rainfall During September 2023 | 6.7 mm |
| Total Rainfall Since Last 01/09 | 6.7 mm |
| Highest 24 Hour Total | 3.8 mm | 7th |
| Rain Days | 4 days |
| Thunderstorm Days | 2 days |
| Hail Days | 0 days |
September 2023 Compared to the Climate Means
| Climate Mean | September 2023 | Anomaly | |
| Mean Maximum Temperature | 28.5°C | 28.4°C | -0.1°C |
| Mean Minimum Temperature | 21.6°C | 21.3°C | -0.3°C |
| Mean Temperature | 25.1°C | 24.9°C | -0.2°C |
| Mean Relative Humidity | 77.4% | 75.1% | -2.3% |
| Mean Atmospheric Pressure | 1016.7hPa | 1016.1hPa | -0.6hPa |
| Total Rainfall | 55.9 mm | 6.7 mm | -49.2 mm |
| Total Rainfall Since Last 01/09 | 55.9 mm | 6.7 mm | -49.2 mm |
| Total Rain Days | 5 days | 4 days | -1day |
| Total Thunderstorm Days | 3 days | 2 days | -1day |
| Total Hail Days | 0 days | 0 days | / |
Drier in September 2023
September 2023, the first month of meteorological autumn, was significantly drier than the norm. Temperatures were marginally below average for the time of year.
The mean temperature of 24.9°C measured by our weather station in Għarb, was 0.2°C cooler than the climate norm. This comprised a mean maximum temperature of 28.4°C and a mean minimum temperature of 21.3°C which were 0.1°C and 0.3°C below the norm respectively. The month’s hottest day was the 19th. The mercury soared to 31.4°C on the day. The day was part of a week of above-average temperatures. This heat spell didn’t qualify to become a heat wave. The coolest temperature last month was measured at 18.1°C in the early hours of the 28th.
There were two distinct episodes of instability during September 2023. The first was the one associated with Storm ‘Daniel’ from the 5th through to the 9th whilst the next was on the 25th and 26th. Both largely affected Malta, leaving Gozo almost completely dry. The national mean for the month of September stood at 21.4 mm, significantly lower than the climate norm of 55.9 mm. Mist or fog patches along with dew were observed on a number of mornings.
There were two main windy episodes. Both corresponded with the only two unstable zones that yielded precipitation. The highest wind gust was measured at 43.5km/h (Force 6) from a Northwesterly direction on the 23rd.
Rainfall Totals around the Maltese Islands in September 2023 (and since last September 1st):
Għarb: 6.7 mm (6.7 mm)
Victoria: 4.8 mm (4.8 mm)
Xewkija: 8.6 mm (8.6 mm)
Nadur: 9.4 mm (9.4 mm)
Marsalforn: 7.8 mm (7.8 mm)
Mellieħa: 22.0 mm (22.0 mm)
Buġibba: 24.9 mm (24.9 mm)
Mġarr: 21.4 mm (21.4 mm)
Naxxar: 24.8 mm (24.8 mm)
Mosta: 25.6 mm (25.6 mm)
Dingli: 12.5 mm (12.5 mm)
Msida: 44.3 mm (44.3 mm)
Valletta: 30.4 mm (30.4 mm)
Imqabba: 25.5 mm (25.5 mm)
Birżebbuġa: 25.2 mm (25.2 mm)
Sliema: 35.3 mm (35.3 mm)
Fgura: 34.3 mm (34.3 mm)
NATIONAL MEAN: 21.4 mm (21.4 mm)