Air Temperature

Highest Maximum 28.6°C 20th
Lowest Maximum 21.3°C 16th
Highest Minimum 20.2°C 20th
Lowest Minimum 12.2°C 3rd

Mean Maximum 24.1°C
Mean Minimum 17.0°C
Mean 20.5°C

Relative Humidity

Highest Relative Humidity 97% Numerous days
Lowest Relative Humidity 29% 3rd

Mean Relative Humidity 79.0%

Wind

Highest Gust 51.5km/h 15th

Mean Wind Speed 11.8km/h
Most Frequent Wind Direction Northwest

Atmospheric Pressure

Highest Atmospheric Pressure 1022.7hPa 18th
Lowest Atmospheric Pressure 1002.5hPa 15th

Mean Atmospheric Pressure 1015.2hPa

Precipitation

Total Rainfall During May 2025 35.3 mm
Total Rainfall Since Last 01/09 480.9 mm

Highest 24 Hour Total 29.0 mm 15th

Rain Days 5 days
Thunderstorm Days 3 days
Hail Days 0 days

Rainfall Events

6/5/2025 1.4 mm A.M. Thunderstorms
9/5/2025 2.8 mm Thunderstorm
15/5/2025 29.0 mm Showers; Distant Thunder; P.M. Thunderstorm
16/5/2025 0.3 mm A.M. Isolated Shower
25/5/2025 1.8 mm A.M. Isolated Showers

May 2025 Compared to the Climate Means

  Climate Mean May 2025 Anomaly
Mean Maximum Temperature 23.9°C 24.1°C  +0.2°C  
Mean Minimum Temperature 15.9°C 17.0°C +1.1°C 
Mean Temperature 19.9°C 20.5°C +0.6°C 
Mean Relative Humidity 74.5% 79.0% +4.5% 
Mean Atmospheric Pressure 1015.9hPa 1015.2hPa -0.7hPa 
Total Rainfall 9.8 mm 35.3 mm +25.5 mm
Total Rainfall Since Last 01/09 514.5 mm 480.9 mm -33.6 mm
Total Rain Days 4 days 5 days +1 day
Total Thunderstorm Days 1 day 3 days +2 days
Total Hail Days 0 days 0 days /

Warmer but Wetter than Average in May 2025

May was a mixed bag of spring weather. As spring settled in across the Maltese Islands, May was characterized by a mix of pleasant weather and occasional instability, including a day of intense thundery downpours. Despite the occasional unsettled spell, last month was warmer than average.

35.3 mm of rain was recorded at our weather station in May. The national mean was around this value too. This was almost four times the climate norm. There were five days with rain over the course of the month. One of them accounted for the vast majority of this rainfall: a staggering 29 mm of it. This was from a series of thundery downpours which affected all of the Maltese Islands on the 15th. The 15th also accounted for the month’s highest wind gust. That day was characterized by a near gale from the South Southeast. The remaining rainy days brought elevated thunderstorms with lots of loud thunder but modest rainfall accumulations. Copious amounts of fine desert sand were deposited by the lighter thunderstorms.

May’s mean temperature of 20.528 was just over half a degree warmer than the climate norm. While daytime temperatures were only marginally warmer than average, nights were warmer by just over a degree. The warmest day and night were those of the 28th with a maximum and minimum of  28.6°C and 20.2°C respectively. The coldest night came earlier in the month, on the 3rd April, with a minimum temperature of 12.2°C on a calm and clear night.

Levels of relative humidity were also noticeably elevated at 79.0%; owing to the wetter than average conditions.

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

Kerċem: 35.3 mm (480.9 mm)

Victoria: 24.4 mm (493.4 mm)

Marsalforn: 29.1 mm (431.8 mm)

Xewkija: 31.3 mm (362.5 mm)

Nadur: 32.3 mm (483.1 mm)

Għajnsielem: 25.9 mm (421.0 mm)

Mellieħa: 35.2 mm (375.8 mm)

Buġibba: 36.6 mm (369.9 mm)

Mġarr: 33.9 mm (450.0 mm)

Naxxar: 32.3 mm (460.0 mm)

Mosta: 35.4 mm (459.4 mm)

Dingli: 36.1 mm (569.3 mm)

Pembroke: 38.9 mm (485.4 mm)

Msida: 36.9 mm (546.3 mm)

Sliema: 36.1 mm (448.4 mm)

Valletta: 32.8 mm (457.8 mm)

Fgura: 45.0 mm (547.4 mm)

Żejtun: 38.8 mm (499.2 mm)

Żabbar: 37.1 mm (552.2 mm)

Imqabba: 40.9 mm (529.1 mm)

Siġġiewi: 41.9 mm (485.7 mm)

Żurrieq: 29.3 mm (473.4 mm)

Marsaxlokk: 28.8 mm (383.8 mm)

NATIONAL MEAN: 34.2 mm (466.0 mm)