Climate Insights for Sliema

The climate in Sliema is warm and mild. The average annual temperature is 20°C and approximately 445mm of precipitation falls per year. November is the wettest month, receiving around 107mm of rainfall. Sliema is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are January, February, March, when temperatures can drop to 13°C.

Sliema sees moderate temperature variation throughout the year, ranging from 13°C to 27°C. The warmest month is August, when average highs reach 27°C and the mean temperature sits around 26°C. January is the coolest month, with minimum temperatures around 13°C and an average of 14°C. Daily temperature variation is modest, with an average difference of 1°C between highs and lows. The sharpest temperature change occurs between May and June, with a 4°C shift in average temperatures.

Sliema is a relatively dry area, receiving approximately 445mm of precipitation annually, which averages out to around 37mm per month. The wettest month is November, averaging 107mm of rainfall. October and December also tend to see above-average precipitation. The driest month is July, with just 0mm. That's 107mm less than November, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.

Sliema is relatively calm, with an average annual wind speed of 6km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is December, averaging 8km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 4km/h, making it an ideal period for wind-sensitive activities. Wind speeds vary significantly across the year, with a 4km/h difference between the calmest and windiest months. This level of variation is worth factoring into travel plans. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 7km/h in winter, 6km/h in spring, 4km/h in summer, 6km/h in autumn.

It is currently summer in Sliema, which began on June 21, 2026. Sliema is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 27°C, while the coldest stretch bottoms out in January near 13°C. Autumn is next, beginning on September 23, 2026 — 93 days from now.

The best time to visit Sliema is during April, May, June, October and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 35mm per month. By contrast, August can be uncomfortably hot with highs reaching 27°C, while January is the coldest period with lows dropping to 13°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Sliema based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.