Step into summer in Port Louis and you’ll instantly notice the steady warmth, high humidity, and those tropical rains that seem to define the place. Daytime temperatures usually hang around 27°C to 29°C, and nights don’t cool off much—rarely dropping below 23°C.
The city sits right on the coast, which means the temperature doesn’t swing wildly. You get a consistent, almost predictable feel to the weather.
Rain shapes the summer climate here in a big way. Showers pop up often, especially in January and February. But honestly, they tend to move through quickly, leaving behind clear skies and that fresh, post-rain air.
Humidity stays high, and the combination of heat and moisture gives you that unmistakable tropical feel as soon as you step outside.
Sunlight feels strong all season, with long days that invite you to get out and explore. The ocean stays warm too, so the waterfront always feels inviting, even when the air gets a bit heavy.
This mix of sunshine, rain, and warm sea temperatures really sets the mood for summer in Port Louis. Whether you’re heading to the beach or wandering the city, you’ll notice it.
Overview of Port Louis Summer Climate
Port Louis stays warm all year, but summer brings the highest temperatures, extra humidity, and more frequent rain. Its coastal spot and tropical monsoon climate create a blend of sunny days, brief rain showers, and thick, humid air.
Geographical Setting and Climate Classification
Port Louis sits on Mauritius’s northwest coast, facing the Indian Ocean. With a low elevation of about 6–7 meters above sea level, sea breezes have a real impact on the weather.
Mountains surround the city and trap moisture, which leads to more rain in summer.
The city fits the tropical monsoon climate (Am) category in the Köppen-Geiger system. So, you’ll get warm weather year-round, but there’s a clear split between wet and dry seasons.
Average annual temperatures hover around 24–25°C (75–77°F). In summer, daytime highs often reach 29–30°C (84–86°F), and nights rarely fall below 23°C (73°F).
Rainfall jumps during this period, with February usually getting the most—about 100 mm (3–4 inches).
Humidity stands out as well. Dew points stay high, so the air feels muggy. Even after sunset, you’ll notice the air remains thick and moist.
Summer Season Timeline
Summer in Port Louis usually runs from December through March. This stretch overlaps with the wettest months.
You’ll see short, intense rain showers, often in the afternoon, and then the skies clear up again.
The hottest period peaks in January and February. Average highs reach 85°F (29–30°C), and nighttime temperatures barely drop below 76°F (24°C). It’s warm, day and night.
Rain hits most frequently from January to March, with February typically being the wettest. On average, Port Louis gets 8–9 rainy days in February.
By late March, the rain starts to ease up, and the shift toward the cooler, drier season begins.
Despite the rain, sunshine is still common. Daylight lasts 12–13 hours, and clouds tend to clear quickly after showers.
Average Summer Temperatures in Port Louis
Summer in Port Louis feels warm and humid, with hardly any difference between day and night. You’ll notice steady high temperatures, mild lows, and the Indian Ocean keeping things from getting too extreme.
Typical Daytime and Nighttime Temperatures
During summer, daytime temperatures usually sit between 81°F and 85°F (27°C–29°C). The hottest afternoons might reach 85°F, but it’s rare to see anything above 88°F.
At night, things cool off just a bit, but the humidity sticks around. Lows average 74°F to 76°F (23°C–24°C), so you probably won’t need anything heavier than a t-shirt.
The dew point stays up—often above 70°F (21°C)—which keeps the mugginess going around the clock.
Humidity mixed with steady warmth can feel a bit much sometimes. Still, the average wind speed of 13–15 mph from the east helps. That breeze makes evenings outside a lot more comfortable.
Monthly Temperature Trends
From December to February, temperatures barely budge. December starts near the lower end, with highs around 82°F (28°C).
By January and early February, highs climb closer to 85°F (29°C). Nights stay warm, hovering near 76°F (24°C).
The ocean warms up too, from about 79°F (26°C) in early summer to 82°F (28°C) by late February.
As the water temperature rises, air temperatures and humidity go up too.
The dew point climbs along with the season. By February, you’ll probably experience muggy conditions almost every day, especially in the afternoons.
Temperature Extremes and Variability
Extreme temperatures just don’t happen often in Port Louis, thanks to the monsoon climate and the ocean’s influence.
The hottest days rarely get past 88°F (31°C). The coolest nights might hit 70°F (21°C), but that’s about it.
Late January usually brings the hottest period, with highs and lows peaking together. December evenings tend to be the coolest, sometimes dipping to 70°F.
There’s not a lot of daily variability. Still, with high dew points, the heat can feel stronger than the numbers show.
Breezy days feel much better, while still, humid days just feel warmer—even if the temperature isn’t higher.
Precipitation and Rainfall Patterns
Summer in Port Louis means frequent rain, high humidity, and short, intense showers. Rain doesn’t fall evenly through the season, and both the number of rainy days and the total rainfall shift from month to month.
Monthly Rainfall Totals
Rainfall hits its peak between January and March, when the wet season is in full swing.
During these months, you’ll see monthly precipitation around 170–180 mm (6.7–7.1 in).
By April, rain totals drop to about 110 mm (4.3 in), and they keep falling as the dry months approach.
From May to October, rainfall drops off sharply. September averages just 25–30 mm (about 1 in).
With November and December, the rain picks up again, reaching 60–110 mm (2.3–4.5 in).
This cycle creates a noticeable contrast between the wetter start of the year and the drier mid-year stretch.
| Month | Avg. Rainfall (mm) | Avg. Rainfall (in) |
|---|---|---|
| January | 175 | 6.9 |
| February | 180 | 7.1 |
| March | 172 | 6.8 |
| April | 112 | 4.4 |
| September | 29 | 1.1 |
| December | 113 | 4.5 |
Frequency of Rainy Days and Wet Days
Rainy days pile up in the first part of the year. In March, you could get rain on 25–26 days, but not every day sees heavy downpours.
Most of the time, you’ll experience quick bursts of rain, not all-day storms.
Between May and September, the number of rainy days drops quickly. August averages just 8–9 days with measurable rain, making it one of the driest times.
By year’s end, the rain picks up again. In December, expect about 12–14 rainy days. That signals the return of wetter weather.
If you’re planning outdoor activities, these shifts matter. The odds of a wet day really change with the season.
Precipitation Intensity
Summer rain in Port Louis isn’t just frequent—it’s strong. Showers tend to arrive in short, heavy bursts, dumping a lot of water fast.
That’s classic for tropical climates with monsoon patterns.
During peak months like January and February, storms can drop 20–30 mm (0.8–1.2 in) in a single go. Sometimes, that’s enough to cause temporary street flooding in low-lying spots.
During the dry months, showers are rare and light. Even if it rains in August or September, you’re usually looking at less than 5 mm (0.2 in) in a day.
That difference in rainfall intensity explains why early summer feels so much wetter, even if the number of rainy days later in the year is similar.
Humidity and Atmospheric Conditions
Summer in Port Louis brings warm temperatures and a heavy dose of moisture in the air. You’ll notice high humidity and a dew point that makes the heat feel a lot stronger than what the thermometer says.
These conditions really affect how comfortable you feel outside, especially during the wettest part of the season.
Average Humidity Levels
From December to February, relative humidity usually sits between 73% and 78%. That’s a lot of moisture, and you’ll feel it most around midday and in the evenings.
Unlike places where humidity drops at night, Port Louis keeps things steady. The air feels sticky almost all the time, especially when daytime highs reach 28°C to 29°C (82°F to 84°F).
Humidity rises with the rain. February, the wettest month, averages about 97 mm (3.8 in) of rain, which pushes humidity to its highest.
Even in January, when there’s a bit less rain, the air still feels heavy because of the monsoon influence.
Travelers should expect slow-drying clothes, frizzy hair, and the need for regular hydration. Light fabrics and indoor breaks help a lot.
Dew Point and Comfort Index
The dew point in Port Louis during summer usually stays around 23°C to 25°C (73°F to 77°F). That’s very humid—most people start to feel muggy at anything above 21°C (70°F).
When the temperature climbs into the upper 20s Celsius, that high dew point makes it tough for your body to cool off by sweating. The heat feels more intense than the number on the weather app.
The comfort index drops in these conditions. You’ll probably feel warm and sticky, even in the shade.
Outdoor activities are still doable, but mornings or late afternoons are a lot more pleasant.
If you’re planning to spend a long time outside, pace yourself. Staying near the coast, where the breeze is stronger, can help make the humidity feel more tolerable.
Sunshine Hours and Daylight Duration
Port Louis enjoys a tropical setting with long stretches of sunlight all year. Daylight patterns stay pretty steady, with only modest changes in sunshine hours and day length across the seasons.
Average Daily Sunshine
Most summer days bring 7 to 9 hours of direct sunshine. December usually tops the list, averaging close to 9.4 hours per day.
June is a bit less sunny, with about 7 hours daily, but that’s still plenty for most outdoor plans.
There isn’t a huge difference from month to month, so you won’t see dramatic swings in sunlight. Even when it’s wetter, Port Louis manages a good mix of sun and clouds.
That makes it easier to plan your days, whether you’re sightseeing or just relaxing.
Compared to other cities, Port Louis gets a lot of daily sunshine. For perspective, northern European cities often get less than half that in winter.
Monthly Sunshine Hours
Throughout the year, Port Louis gets about 2,900 to 4,000 hours of sunshine, depending on which dataset you check. December usually brings the most sun, with around 280+ hours of sunshine.
June’s the least sunny, but you’ll still see over 210 hours.
Here’s a quick breakdown:
| Month | Sunshine Hours (approx.) |
|---|---|
| December | 280+ hours |
| June | 210+ hours |
| Annual | ~2,900–4,000 hours |
Even on the lower end, Port Louis gets more sunshine than a lot of other popular spots. That steady sunlight draws visitors all year.
The reliable sunshine helps keep outdoor markets, festivals, and beach life going strong, no matter the season. You’ll almost never run into a month that feels too gloomy or gray.
Seasonal Changes in Daylight
Daylight hours in Port Louis shift slowly as the year rolls on. June has the shortest days, with about 10 hours and 54 minutes of daylight.
December brings the longest days, hitting around 13 hours and 19 minutes.
Unlike places farther from the equator, Port Louis doesn’t get wild swings in day length. You won’t see endless summer days or really short winter ones.
Daylight stays pretty balanced, making routines easier to plan.
If you’re traveling here, you can schedule hikes, tours, or beach trips without stressing about early sunsets sneaking up on you.
Wind and Water Temperature
Port Louis summers come with steady breezes and warm ocean water. You’ll notice moderate winds that shift a bit with the season, and the sea stays inviting for swimming and water sports.
Average Wind Speed and Patterns
From December to February, winds usually range between 17 km/h and 20 km/h. The southeast trade winds shape the weather here, especially during summer.
Sometimes, gusts can hit 30 km/h, mostly along the open coast.
Inland, the wind feels lighter because the landscape blocks some of it.
At Sir Seewoosagur Ramgoolam International Airport, about 48 km southeast of Port Louis, wind speeds run a bit higher since the area is wide open. You can use this as a decent guide when planning anything outdoors.
Summer winds really help cool things off, which is a relief when it gets humid. Walking around the city or hanging out at the beach feels much better, even on the hottest days.
Water Temperature in Summer
The Indian Ocean around Port Louis stays warm all year, but honestly, summer brings the hottest water. From December to February, the average water temperature sits between 27°C and 28.5°C (81°F to 83°F).
That kind of warmth feels perfect for swimming or snorkeling. Most people skip wetsuits, since the water stays comfortable even if you’re in for a while.
Locals and visitors both flock to the beaches in summer, drawn by the extra warmth compared to the cooler months. Coral reefs seem even more inviting, and boat trips get a boost from the steady temperatures.
The water barely cools off at night, so you can head out for an evening swim or try some late-afternoon water sports without worrying about getting chilly.