If you’re planning a summer getaway to Sliema, get ready for warm, dry days and loads of sunshine. Daytime temperatures usually hover between 23°C and 27°C, and you’ll hardly see any rain. The Mediterranean climate really invites you outside, whether you’re up for a stroll along the seafront or just soaking up the sun.
Most days, you’ll look up and see clear blue skies. That means you get those long, bright evenings by the coast—perfect for unwinding. The sea warms up nicely too, so swimming and water sports just become part of the daily routine.
The heat definitely sets the tone for summer, but gentle coastal breezes roll in and help take the edge off the warm air. Humidity stays pretty consistent, and the weather rarely throws any surprises, making Sliema a comfortable spot for both relaxing and exploring.
Overview of Sliema’s Summer Climate
Summers in Sliema bring plenty of sunshine, warm seas, and barely any rain. You’ll get clear skies almost every day, with hot afternoons giving way to breezy, pleasant evenings.
Mediterranean Climate Characteristics
Sliema sits right on Malta’s northeast coast, so it gets a Mediterranean, hot-summer climate (Csa). Expect dry, sunny, and warm days, and at night, temperatures rarely dip below the mid-60s °F.
During the day, highs usually land between 78°F and 85°F (25–29°C). The hottest stretch comes in late July and early August. Nights stay mild, averaging 65–73°F (18–23°C), so you can comfortably eat outside or take a walk after sunset.
Humidity does creep up as summer goes on. June feels less muggy, but by August, you’ll definitely notice higher dew points. Still, the sea helps keep things from getting too oppressive.
Sliema’s spot by the water brings in steady breezes. Winds usually blow from the west at about 9–10 mph, offering a bit of relief from the sun.
Comparison to Malta’s National Averages
If you compare Sliema to the rest of Malta, you won’t find huge differences. The city sits just about 83 feet (25 meters) above sea level, while Malta’s inland areas are a bit higher. That coastal location keeps Sliema a little milder and less changeable than the island’s center.
Malta’s yearly average temperature is close to 68°F (20°C), but Sliema tends to run a bit warmer. Rainfall stays low everywhere in summer, but Sliema’s coast means showers are shorter and less frequent than in some inland spots.
The sea makes a big difference. In Sliema, water temperatures quickly climb from 68°F (20°C) in June up to nearly 79°F (26°C) by late August. That’s why swimming and water sports feel so much better here in summer than they do in spring.
Typical Summer Weather Patterns
Most of the time, you’ll see clear skies, especially in July. Cloud cover drops from about 27% in early summer to just 11% by August. July 22 often stands out as one of the sunniest days.
Rain barely makes an appearance. The odds of a wet day start at 4% in June and only reach about 7% by late August. Even then, you’re looking at less than an inch per month.
Daylight shifts as summer moves along. In June, you’ll enjoy over 14 hours of sun, but by late August, it drops to about 13 hours. Sunsets move from around 8:20 PM in late June to 7:30 PM by the end of August.
By mid-summer, the mix of humidity and heat creates muggy afternoons, especially in August. Still, the sea breeze, warm water, and those long evenings really make summer in Sliema appealing for both visitors and locals.
Average Summer Temperatures in Sliema
Sliema’s summer brings steady warmth and barely any rain. You’ll feel the heat during the day, enjoy mild evenings, and find sea temperatures just right for swimming.
Daytime and Nighttime Temperature Ranges
During summer, daytime temperatures typically range from 23°C (73°F) to 27°C (81°F). July and August usually bring the hottest days, with highs at the top of that range. The heat is definitely noticeable, but it’s not as intense as what you’d find inland.
At night, things cool down to about 20°C (68°F) to 23°C (73°F). That makes evenings great for outdoor meals or a walk by the water. Air conditioning helps in hotels, but honestly, many people just open a window and let the breeze do its thing.
Humidity hovers around 70–75%. It can make the heat feel a bit warmer, but the sea breeze usually helps out.
Monthly Temperature Trends
In June, daytime highs average about 23°C (73°F), with nights closer to 20°C (68°F). The tourist season starts picking up, and it’s already warm enough for a swim.
July gets hotter, with average highs near 26°C (79°F). Rain is almost unheard of, and sunlight sticks around for ages, making it the driest, sunniest month.
August is usually the warmest, with highs peaking at 27°C (81°F). The sea hits its warmest—around 26°C (79°F)—so it’s the perfect time for water activities. Evenings stay mild, so you can linger outdoors without needing extra layers.
| Month | Avg High °C (°F) | Avg Low °C (°F) | Sea Temp °C (°F) |
|---|---|---|---|
| June | 23 (73) | 20 (68) | 23 (73) |
| July | 26 (79) | 22 (72) | 25 (77) |
| August | 27 (81) | 23 (73) | 26 (79) |
Record High and Record Low Temperatures
While temperatures usually stay in a tight range, there are some outliers. The record high for Sliema in summer is about 36°C (97°F), typically during a late July or early August heatwave. Those spikes are rare, but they do happen.
The record low for summer is around 17°C (63°F), usually on an early June or late August night. These cooler nights don’t come often, and most evenings are much milder.
So, Sliema’s weather stays pretty consistent, which is probably why so many people choose it for summer holidays.
Rainfall and Rainy Days During Summer
Sliema summers are famously dry, with barely any rain and not many wet days. Rain picks up a bit near the end of the season, but most days stay clear.
Average Rainfall Amounts
Rainfall in summer is minimal. Early June averages about 0.3 inches (7 mm) for the month. By late August, it nudges up to around 0.8 inches (20 mm).
July is the driest month, sometimes seeing just 0.1 inches (2 mm). You can expect long dry stretches.
For context, winter months often bring 60–80 mm of rain in a month, so summer feels especially dry. The lack of rain makes it easier to plan outdoor activities, since storms are pretty rare.
Frequency of Rainy Days
Rainy days hardly show up in Sliema’s summer. In June, the odds of a wet day are about 4%, dropping to just 1% in mid‑July. By late August, chances rise a bit to 7%.
It’s common to go weeks without a single rainy day. July often passes with zero rainy days.
If you do catch some rain, it’s usually a quick, light shower. That means you can count on most days for sightseeing, swimming, or whatever else you’ve got planned outside.
Seasonal Precipitation Patterns
Rainfall slowly increases from June through August. The start of summer is almost totally dry, but by the end of August, you might notice a slight uptick in showers.
That change hints at autumn’s arrival, when rain gets more common. By September, rainfall jumps up, signaling wetter months ahead.
Here’s how it usually goes:
- June: very light rainfall, often under 10 mm
- July: driest stretch, almost no measurable rain
- August: slight increase, up to 20 mm on average
So if you’re planning a trip, just know late summer has a slightly higher chance of showers than early summer.
Sea Conditions and Temperatures
The sea around Sliema stays warm and calm through most of summer. Swimming and water sports are a breeze, thanks to steady conditions and lots of sunshine.
Average Sea Temperature
During summer, the average sea temperature in Sliema climbs steadily. In June, water sits around 22–23°C (72–73°F)—a bit cool at first, but still fine for a swim.
By July, the sea warms to about 26°C (79°F), making it perfect for longer swims. August brings the peak, with water hitting 27–28°C (81–82°F), which is really warm by Mediterranean standards.
These temps stick around thanks to the dry, sunny weather. The sea stays calm, and with little rain, you won’t see sudden cold snaps.
Best Months for Swimming
For the warmest, most enjoyable water, July and August are your best bet. The sea hits its highest temperatures, and conditions are usually calm with almost no rain.
June is good too if you like the water a tad cooler and want to avoid crowds. The sea is already warm enough, and you get those long days to enjoy it.
Even in September, the water stays warm—often above 25°C (77°F). Early autumn can be just as nice for swimming, and the beaches get quieter.
Sea Temperature Fluctuations
The sea in Sliema doesn’t swing wildly in temperature during summer. Once it heats up in June, it stays pleasant right through early autumn. Daily changes are minor, and you won’t notice much difference between day and night.
Early June mornings can feel a bit cooler, but by late August, the sea stays warm all day and into the evening.
Since rain is rare, you don’t have to worry about storms cooling things off. Overall, the sea temperature changes slowly, so you can count on good swimming or boating conditions.
Humidity and Air Quality in Summer
During summer in Sliema, you’ll deal with higher humidity levels and warm weather. This combo can affect how comfortable you feel outside and might even impact your breathing or general well-being.
Average Relative Humidity Levels
Relative humidity in Sliema during summer usually sits between 70% and 75%. July is often the driest, while June and August stay a bit higher. Even at its lowest, the air feels a little damp.
Unlike some other Mediterranean towns, Sliema’s humidity doesn’t drop much at night. Evenings stay humid, and the warm sea breeze adds to the heavy feeling. The nearby sea keeps pumping moisture into the air all day.
You won’t see big swings in humidity from day to day. With almost no rain, summer humidity stays pretty steady. For travelers, that means conditions are predictable, though it can feel a bit stickier than the numbers suggest.
Impact on Comfort and Health
High relative humidity makes it harder for your body to cool down by sweating. Even if the thermometer says 26, 27°C (79, 81°F), the air can feel warmer, since moisture slows down evaporation from your skin.
Walking long distances or climbing Sliema’s hilly streets gets more exhausting in this kind of weather.
If you deal with breathing conditions like asthma, the thick air might feel uncomfortable. Sure, air quality in Sliema is usually pretty good, but when you add humidity and a bit of summer traffic, those narrow streets can feel stuffy.
To stay comfortable, you might want to:
- Stay hydrated so your body can regulate heat.
- Find shade or catch sea breezes during the hottest parts of the day.
- Wear light clothing that lets air flow through.
These tips can help you handle the humid conditions and enjoy being outdoors without feeling wiped out.
Wind Speed and Summer Breezes
During summer in Sliema, winds tend to stay mild, but they still play a big role in how the air feels along the coast. Breezes balance out the heat, making things more pleasant outside and shaping what you do on land and water.
Typical Wind Speed Ranges
In summer, wind speeds in Sliema usually hover around 3 meters per second (about 11 km/h or 6, 7 mph). That’s what most people would call a light to moderate breeze.
You’ll spot flags moving and see leaves or small branches swaying.
Winter winds often pick up to 5 m/s, so summer feels much calmer by comparison. July through October bring the least wind, which means you get steady, gentle breezes instead of those sharp gusts.
This light, steady airflow keeps the air from getting too stale, especially during a hot afternoon. Sometimes, a breezier day sneaks in, but it rarely messes with your plans.
Influence on Weather and Outdoor Activities
These moderate summer breezes really shape how you feel the heat. When the air moves, it cuts down on that sticky, muggy sensation—especially when it’s humid—and gives you a bit of natural cooling as temperatures rise.
If you’re into outdoor activities, you’ll find the wind speed just right for things like casual sailing, paddleboarding, or simply relaxing on the beach. It usually isn’t strong enough for serious windsurfing or kitesurfing, though—those sports thrive in the windier months.
Dining outside feels better with these breezes too. They keep the air fresh out on terraces and along seafront promenades, but stay gentle enough that you won’t have to chase after napkins or worry about your meal blowing away.
Honestly, this mix of comfort and predictability makes summer winds in Sliema a big part of what people love about the coast.