Average Summer Weather in Moroni, Comoros: Key Facts & Climate Insights

If you spend summer in Moroni, you’ll find yourself in one of the driest and most comfortable times of the year. Warm days usually hover around 25°C to 27°C (77°F to 81°F), humidity drops, and rainfall is much lower than in other seasons. That’s a welcome change if you want to get outside or explore the coast without dodging constant rain.

While the air cools a bit compared to the hotter stretch earlier in the year, the sea stays inviting at about 26°C (79°F). Long, sunny days and steady breezes create a calm, pleasant vibe that really defines Moroni’s summer.

These steady conditions let you enjoy both the inland landscapes and the shoreline without worrying much about sudden storms. The summer weather makes it easier to spot temperature patterns, rainfall trends, and sunshine hours, and to see how Moroni’s climate stacks up against other tropical spots.

Overview of Average Summer Weather in Moroni

In Moroni, summers bring steady warmth, high humidity, and frequent rainfall. Temperatures don’t swing much, but cloud cover and precipitation ramp up as the season goes on, shaping daily life and travel plans.

Climate Classification and Location

Moroni sits on the west coast of Grande Comore, the biggest island in the Comoros. You’ll find the city near the equator in the Mozambique Channel, so it has a tropical rainforest climate (Af Köppen classification).

That means you get warm conditions all year, with no true dry season. Rainfall and humidity dominate most of the year, especially in summer.

Average daily highs stick near 29–31°C (84–88°F), while lows float around 23–25°C (73–77°F). The Indian Ocean helps keep these ranges pretty tight.

Because Moroni is right on the coast, sea breezes help a bit with the heat, but they don’t do much for the heavy humidity. Water temperatures stay steady near 29°C (84°F), so you’ll notice that muggy feeling all season.

Typical Summer Weather Patterns

In summer, you’ll get a mix of cloud cover, rising rainfall, and stubborn humidity. Early in the season, skies are partly cloudy about half the time, but by February, overcast days take over nearly 80% of the time.

Rainfall climbs fast. At the start of summer, monthly totals hit around 39 mm, but by late January, they can jump past 130 mm in a month. Showers tend to be brief but intense, so you’ll probably run into daily wet weather.

Humidity hovers near 100% of days classified as muggy, so don’t expect much relief, even at night. Winds start out from the east in December and shift more northerly later, usually blowing around 13–15 kph.

Daylight doesn’t change much. The longest summer days run about 12 hours 49 minutes, while the shortest drop to 12 hours 20 minutes. Sunlight stays strong, but cloud cover cuts down the direct rays as the season moves along.

Grande Comore’s Influence on Local Climate

Grande Comore’s rugged terrain really shapes Moroni’s summer weather. The island’s steep volcanic slopes, including Mount Karthala (over 2,300 meters), create microclimates and boost rainfall with orographic lift as moist air climbs the hills.

You’ll spot heavier showers near higher ground compared to the coast. Moroni, at just 27 meters above sea level, gets less rain than the island’s interior but still sees plenty of downpours.

The surrounding ocean matters too. Water covers more than 90% of the area within 80 km, so the sea keeps temperatures steady and stops extremes.

Local vegetation—cropland, dense trees—adds to the humidity. All these factors combine to make Moroni’s summers consistently warm, cloudy, and wet, more so than in many other tropical coastal cities.

Temperature Trends During Summer

Summer in Moroni means steady warmth, high humidity, and seasonal rainfall you’ll definitely notice. Daytime stays hot, nights are warm and muggy, and temperatures only shift a little from month to month.

Average High and Low Temperatures

Daytime highs during summer usually land around 31 °C (87 °F). They almost never drop below 29 °C (84 °F) or go above 32 °C (90 °F). You won’t see big swings in daytime heat.

At night, lows average about 25 °C (77 °F). They rarely fall below 23 °C (73 °F), so evenings stay warm and humid. February nights are the warmest, with lows near 25 °C.

This narrow gap between highs and lows means the heat lingers well past sunset. Moroni doesn’t cool off much overnight, which might catch you off guard if you’re not used to tropical weather.

Monthly Temperature Variation

Even though summer temperatures don’t change much, there are a few small shifts. Early December is usually hottest, with highs averaging 31 °C and lows near 24 °C. By late February, highs drop just a degree, down to about 30 °C.

The “coolest” time actually comes in August, outside the summer months, when highs dip to around 28 °C (82 °F). So, summer definitely stands out as the warmest stretch, but there aren’t any big spikes.

These minor changes mean you can pack the same clothes and expect similar cooling needs all summer.

Humidity and Comfort Levels

Humidity in Moroni stays high all summer, with dew points always above 23 °C (73 °F). That makes for a muggy environment that feels warmer than the thermometer says. You won’t get much relief—humidity sticks close to 100% of the time during this season.

With all that moisture, sweat doesn’t evaporate easily. The heat can feel heavy, especially when it’s cloudy and rainy.

If you’re visiting, you’ll want lightweight clothing, dependable indoor cooling, and extra water. Even a short walk outside can feel draining, so pace yourself.

Rainfall Patterns and Dry Season Characteristics

Moroni’s tropical setting shapes its climate, with big differences between the wettest months and the drier middle of the year. Rainfall levels, how often it rains, and the timing all affect your experience during summer and beyond.

Wet and Dry Season Timing

Moroni has two main rainfall periods. The wet season runs from January through April, and heavy downpours are common. Humidity stays high, and outdoor plans can get tricky.

The dry season comes in from May to October, with a sharp drop in rain. You’ll see clearer skies, more sunshine, and way fewer rain disruptions.

November and December bring more rain again, but not as much as the earlier peak. This cycle repeats year after year, so you can count on it.

Average Monthly Rainfall

Rainfall swings a lot through the year. In January, the wettest month, Moroni picks up about 233 mm (9.17 in) of rain. The driest months, July and August, see totals drop to around 12–20 mm (0.47–0.79 in).

Here’s a simple breakdown:

This shows how sharply rain drops mid-year. The dry season is much better for travel and being outdoors.

Frequency and Intensity of Rainfall

Rain in Moroni isn’t just light drizzles. During the wet months, storms hit in short but intense bursts, so daily totals can be high. January alone brings over 20 rainy days, making it tough to plan outdoor stuff.

In the dry season, rain is rare. When it does fall, showers are quick and less of a hassle. You might see 8–10 rainy days in a month, but the total rain is way less than in the wet season.

This big difference in how often and how hard it rains is classic Comoros weather. Be ready for sudden, heavy showers early in the year, and expect much calmer, drier days from June to September.

Sunshine and Cloud Cover

You’ll get steady daylight during summer in Moroni, but sunshine hours and cloud cover shift as the season rolls on. Rainfall and humidity also change how much sun you actually feel each day.

Average Daily Sunshine Hours

In summer, Moroni averages 6 to 8 hours of sunshine per day, depending on the month. December is brighter, with nearly 8 hours daily. January and February get less sun—about 6 hours—thanks to thicker clouds.

Even on cloudier days, you’ll still have enough daylight for outdoor plans. The shortest days come in late February, with about 12 hours and 20 minutes of daylight. Late December stretches to almost 12 hours and 50 minutes.

Quick reference:

You can count on reliable daylight, but the sun’s strength and clarity depend a lot on cloud cover.

Seasonal Changes in Cloudiness

Clouds build up fast as summer goes on. In early December, skies are clear or partly cloudy about 50% of the time, so days feel brighter. By mid-February, skies turn overcast or mostly cloudy more than 80% of the time, making it the grayest part of the year.

The shift is easy to notice. Early summer days feel open and warm, while late summer brings more gray skies and higher chances of rain.

You’ll also see that the wettest weeks are the cloudiest, especially in January. This cuts down direct sunshine, but it does help keep daytime highs near 28–29°C (82–84°F).

Cloud cover patterns stay pretty much the same each year, so if you’re planning a trip or outdoor activities, December is usually clearer, while February gets much cloudier.

Sea Temperature and Coastal Weather

The waters around Moroni stay warm all year, but small seasonal changes can affect how comfortable swimming feels. Coastal conditions shift a bit with the trade winds, which can change water clarity and surface currents.

Average Sea Temperatures in Summer

Summer in Moroni brings high sea temperatures, so you’ll almost always find warm water. In December, the average sits around 28.7°C (83.7°F).

It bumps up just a little in January and February, hanging close to 28.9°C (84°F). By March, the sea hits its warmest point at about 29.3°C (84.7°F).

This range keeps the water feeling warm and pleasant, but never uncomfortably hot. You won’t really notice big changes from month to month—usually less than 1°C difference.

With this steady warmth, you can count on good swimming conditions. Even if the air gets a bit cooler from rain or humidity, the sea itself stays inviting.

Best Months for Swimming and Water Activities

You can swim any time in Moroni, but some months just feel better. From December to March, the water is at its warmest, and a lot of travelers say that’s the best for long swims.

These months line up with the wetter season, so you’ll probably get some brief rain showers. Still, the rain usually doesn’t last long and doesn’t cool the sea.

If you want the water a touch cooler but still really nice, April and May might suit you better. Rainfall starts to ease up then, and you often get clearer water for swimming.

For snorkeling and diving, late summer into early autumn can be a real treat. Calmer seas mean better clarity, so you get more out of exploring the coast.

Comparing Moroni’s Summer Climate to Other Regions

Moroni’s summer weather reflects its tropical spot—lots of warmth, high humidity, and barely any rain. The conditions here don’t just set Moroni apart from nearby Comoros islands, but from other tropical places too.

Moroni Versus Other Comoros Islands

On Grande Comore, where Moroni sits, summer is actually the driest stretch of the year. Rainfall drops to about 12–31 mm per month, and nighttime temperatures dip to 24°C (75°F), while days hover around 25–26°C (77–79°F). Winds pick up during this season, which brings a nice cooling touch.

If you look at Anjouan or Mohéli, you’ll spot some differences. These smaller islands usually get a bit more rain in summer, though it’s still not much compared to the wet season. Their temperatures stay pretty close to Moroni’s—maybe a degree off—but with less wind, the humidity can feel heavier.

Moroni’s spot on the western coast of Grande Comore lets steady sea breezes roll in, making the dry season feel more comfortable. That breeze makes outdoor activities here a lot more pleasant than in some of the more sheltered towns on other islands.

How Moroni’s Summer Compares Globally

If you look at Moroni’s summer and compare it to East African coastal cities like Mombasa or Dar es Salaam, you’ll notice Moroni feels cooler and drier. Those cities usually hit highs around 28–30°C (82–86°F), and honestly, the humidity and showers there can get pretty relentless.

Now, if you stack Moroni up against Southeast Asian tropical cities—think Jakarta—things shift a bit. Jakarta’s summer brings heavy rainfall and sticky humidity, but Moroni tends to stay dry, and you get plenty of long sunny days.

When you compare Moroni to Caribbean islands like Barbados, Moroni’s summer comes off as a bit cooler. Barbados averages highs near 29–30°C (84–86°F), but Moroni usually sits around 25–26°C (77–79°F).

The lower temps and less rain in Moroni really make its summer feel more moderate than a lot of other tropical places.

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