Summer in Grand Baie feels warm, skies usually stay clear, and breezes off the Indian Ocean are a welcome relief. You’ll notice only small changes in temperature, so it’s easy to relax on the beach or wander around town without worry. Most summer days sit comfortably in the mid-70s °F (around 23°C to 25°C), and there’s a lot less rain than during the wet season.
The sea stays inviting all summer. Swimming, snorkeling, and sailing just slip into your plans with barely a thought. Winds pick up now and then, so the air doesn’t get sticky, and water sports get a nice boost.
If you’re curious about how the climate shapes your trip—from sunshine hours to sea temperatures—you’ll probably see why summer is such a reliable time to visit Grand Baie.
Let’s look at the main weather factors so you can plan your trip with a bit more confidence.
Overview of Grand Baie’s Summer Climate
In Grand Baie, summer brings steady warmth, less rainfall than earlier in the year, and a refreshing breeze from the Indian Ocean. You’ll get mild temperature shifts and drier days, with lots of sunshine for outdoor fun or water activities.
Location and Climate Type
Grand Baie sits up on the northern coast of Mauritius, just a few meters above sea level—maybe 5–20 meters at most. Its spot on the coast means the southeast trade winds blow in regularly, which keeps the tropical heat in check.
The climate here follows a tropical monsoon pattern. Basically, it’s warm all year, but you’ll notice a clear split: the start of the year is wetter, and the middle months are much drier.
During summer, which runs from June to August in Mauritius, rainfall drops off sharply compared to the wet season. The area gets some of its lowest monthly averages, usually about 13–25 mm.
Humidity doesn’t disappear, but it’s less intense than in January through March. With those steady breezes, the air feels a lot more comfortable for both daytime and evening plans.
General Weather Patterns
Air temperatures in Grand Baie during summer usually hang between 23°C and 25°C (73°F to 77°F). Nights cool down a bit but rarely fall below 22°C. You won’t get blasted by heat or caught out in the cold.
The sea temperature stays warm too, averaging 23°C to 25°C. Swimming, snorkeling, and diving are all pleasant—no shock from chilly water.
Rain hardly ever lingers, and when showers do come, they’re quick. Sunshine hours bump up, often hitting 7–8 hours per day, so you get long, bright stretches.
Winds are more obvious in summer. The southeast trades really get going, sometimes reaching 20–25 km/h. This cools things off and makes sailing, windsurfing, and kitesurfing extra tempting.
Seasonal Overview
Summer in Grand Baie falls between June and August, matching up with the island’s cooler, drier half of the year. Compared to the humid wet season, this stretch feels way more comfortable and steady.
Key features of summer weather include:
- Temperature: 23–25°C (73–77°F)
- Rainfall: 13–25 mm monthly
- Sea Temperature: 23–25°C (74–77°F)
- Sunshine: 7–8 hours daily
- Wind: Stronger southeast trade winds
You get a nice mix of warmth and dryness. Planning outdoor adventures or lazy beach days is easier since the weather rarely throws a curveball.
Average Summer Temperatures
Summer in Grand Baie means warm, humid days and nights that don’t cool off much. The heat peaks in January, February, and March, and the sea gets warmer too, with extra moisture in the air.
Daytime and Nighttime Temperatures
During summer, daytime highs usually reach 83–85°F (28–29°C). February brings the warmest days, with average highs at about 85°F (29°C).
Even at night, it stays mild—lows rarely dip below 74–76°F (23–24°C). The small gap between day and night means you won’t really get relief after sunset.
Evenings stay warm, and humidity can make it feel hotter. Light clothes and a bit of shade or air conditioning go a long way.
The sea temperature sits around 27–28°C (81–82°F), adding to the overall warmth. If you’re heading outside, mornings and late afternoons usually feel more comfortable than midday.
Temperature Variation by Month
The summer season in Grand Baie runs from December through March. Temperatures don’t swing much, but there are a few small changes.
- December: Highs around 84°F (29°C), lows near 74°F (23°C).
- January: Still hot, highs near 85°F (29°C).
- February: The hottest month, with days at 85°F (29°C) and nights at 76°F (24°C).
- March: Starts to cool, highs closer to 84°F (29°C).
Humidity sticks around, making the air feel heavy. Rain is more frequent, and nights can get a bit muggy. It’s smart to plan for both heat and humidity when you pack.
Comparison to Other Seasons
Compared to the rest of the year, summer in Grand Baie feels hotter and wetter. From June to September, highs drop to around 76–77°F (24–25°C), and nights cool off to 67–69°F (19–21°C).
This cooler period feels less humid and, honestly, a bit more comfortable.
Spring and autumn bring moderate temperatures, usually 77–81°F (25–27°C) during the day. Rain is lighter, and skies are clearer.
Summer stands out for its higher humidity, warmer nights, and more rain. If you love hot weather and don’t mind the odd shower, you’ll find the warmest sea and the most tropical vibe in Grand Baie.
Rainfall and Rainy Days During Summer
In Grand Baie, summer rainfall starts light and builds up as the months go by. You’ll notice both the amount of rain and the number of rainy days rising from June through August, which can shape your plans.
Monthly Rainfall Totals
Rainfall in Grand Baie during summer is pretty low in June and July, but it picks up in August. June usually gets about 25–30 mm of rain.
July follows with a little more, around 40–45 mm. By August, it climbs to 50–60 mm.
Here’s a quick look:
| Month | Average Rainfall (mm) |
|---|---|
| June | ~25–30 mm |
| July | ~40–45 mm |
| August | ~50–60 mm |
These numbers are still a lot less than the wet season, but you can see the shift toward heavier rains as September approaches.
Number of Rainy Days
You won’t see many rainy days in summer, especially in June. Maybe 2–3 rainy days that month.
July brings a few more, with 3–4 days of measurable rain. August is usually the wettest, with 5–6 rainy days on average.
Rain falls in short bursts, not all-day storms. So even if it rains, you’ll probably still get plenty of sunshine for most of the day.
Rainfall Patterns and Trends
Summer in Grand Baie really is the driest part of the year. Rainfall starts low in June and ticks up each month.
Showers tend to hit in the late afternoon or evening, probably pushed in by the trade winds. Rain isn’t frequent, but when it comes, it can be heavy.
This pattern means you get lots of dry, sunny days with just the occasional refreshing shower.
Sea Temperature and Beach Conditions
In summer, the sea in Grand Baie stays warm and welcoming, with only small changes month to month. Swimming, snorkeling, and other water activities are usually on the table, though wind and rain can sometimes change how the beach feels.
Average Sea Temperatures
Sea temperatures during summer generally range from 23.4°C (74°F) to 25.1°C (77°F). That’s a bit cooler than the wet season, but still warm enough for most people to stay in the water as long as they like.
Day and night water temperatures barely change, so you’ll get steady conditions whether you swim in the morning or later in the day.
The sea feels refreshing but not cold—perfect if you want to cool off but hate chilly water.
Here’s a quick breakdown of sea temperatures in summer:
| Month | Avg. Sea Temp (°C) | Avg. Sea Temp (°F) |
|---|---|---|
| June | 25.1 | 77.2 |
| July | 23.7 | 74.7 |
| August | 23.4 | 74.1 |
Swimming and Water Activities
You can swim comfortably all summer, though July and August might feel a little brisk at first. Most people get used to it quickly, and the water stays pleasant for both quick dips and longer swims.
Snorkeling is great this time of year because the water is clearer when there’s less rain. Coral reefs and fish are easier to spot.
Winds pick up in summer, so sailing, windsurfing, and kitesurfing are popular. But those breezes can make the water choppy near the shore. If you like calm swimming, try early mornings for the smoothest water.
Best Times for Beach Visits
The driest months—July through September—bring fewer showers and more sun, making them ideal for full beach days.
If you want the warmest sea, June is your best bet. Later in the summer, the water cools just a touch, but most visitors still find it comfortable.
Think about wind exposure too. Beaches with natural coves or reefs usually have calmer water, while open stretches can get breezy. Picking the right spot makes a big difference for comfort and activities.
Wind Speeds and Breezes
Summer in Grand Baie comes with steady winds that shape the daily weather almost as much as temperature or rain. Breezes bring relief from the heat, though sometimes gusts reach levels that might affect your comfort or plans.
Typical Wind Speed Ranges
During the summer months, you’ll usually feel wind speeds between 12–17 miles per hour (mph). The breeziest stretch is typically in July, but winds stay noticeable from late May through September.
In February and March, the winds calm down a bit, dropping to 12–14 mph—gentler than mid-year.
The southeast trade winds dominate here. They’re steady and predictable, making them a key part of Grand Baie’s weather.
Here’s a simple look at average summer wind speeds:
| Month | Avg. Wind Speed (mph) |
|---|---|
| Dec | 14–15 |
| Jan | 13–15 |
| Feb | 12–14 |
| Mar | 12–14 |
This steady airflow keeps the heat in check, especially during the hottest parts of the day.
Effects on Outdoor Activities
In Grand Baie, the breezes usually work in your favor. They cool the air and keep the humidity from getting too heavy.
When you’re sitting outside, you’ll feel how the winds make the warm temperatures a lot more comfortable.
If you love water sports, the southeast trade winds create reliable conditions for windsurfing, kitesurfing, and sailing. These steady breezes give you enough power on the water without making the seas too rough near the shore.
Beachgoers might notice the wind sometimes brings a bit of sand drift, especially on wide stretches of sand. I’d suggest picking a spot with some natural windbreaks, like trees or rocky coves, to help cut down on this.
Dining outside is usually pretty pleasant. Just remember to secure lighter items on your table during breezier days.
Evenings generally feel calmer, since the winds often ease up a bit after sunset.
Additional Summer Weather Factors
During summer in Grand Baie, you’ll notice more than just warmth and less rain. Sunshine hours, humidity levels, and visibility all shape how you spend your time outdoors.
Hours of Sunshine and Daylight
Summer brings longer daylight hours and plenty of sunshine to Grand Baie. On average, you get 7 to 8 hours of bright sun per day, even right in the middle of the dry season.
That’s plenty of time for swimming, sailing, or wandering through the local markets.
Daylight length doesn’t change much, thanks to the island’s tropical spot. Between June and August, days average about 11 hours of total daylight.
This makes planning your day easier, since sunrise and sunset times hardly shift.
You might run into a few brief cloudy spells, but they usually pass quickly. They rarely mess up outdoor plans.
It’s smart to carry some light sun protection, since UV levels stay high even if the sky looks partly cloudy.
Humidity Levels
Humidity in Grand Baie during summer feels moderate, especially compared to the wetter months earlier in the year. Average relative humidity sits between 74% and 77%, and the steady coastal breezes help keep things comfortable.
The drier air makes it easier to enjoy physical activities without that sticky, heavy feeling you get in the wet season.
You’ll probably feel cooler than the actual temperature, thanks to the lower moisture and stronger winds.
In the evenings, humidity might rise a little, but it’s still manageable.
If you’re sensitive to humid air, you’ll likely find this time of year far more pleasant than visiting between January and March, when humidity really peaks.
Cloud Cover and Visibility
Cloud cover in summer usually stays light, so you get mostly clear skies. Less rain brings fewer thick clouds, and you’ll notice visibility along the coastline and lagoon is often excellent.
You might catch yourself staring way out toward the horizon—great for boating, diving, or just soaking in the view. Stargazing at night? That’s a real treat here, especially in coastal spots where there’s barely any light pollution.
Sometimes, you’ll see quick afternoon clouds rolling in, but they don’t stick around long enough to ruin the view. For most of the season, you’ll enjoy high visibility conditions, so summer really is a solid choice for both land and water adventures.