Climate and monthly weather forecast
Saint-Denis, Reunion

The glorious landscape of the Saint-Denis city, on Reunion Island
The glorious landscape of the Saint-Denis city, on Reunion Island

The climate of Saint-Denis

Saint-Denis, the capital city of the Reunion Island, carries a Csa classification under the Köppen climate system. This classification identifies its climate as Mediterranean, more specifically, a hot summer Mediterranean climate. Geographically, it is located in the southern hemisphere, which means its seasons are reversed from those experienced in the northern hemisphere.

An examination of the climate data reveals that Saint-Denis experiences quite consistent weather throughout the year. Temperatures remain relatively high, with average monthly highs ranging from 25.2°C (77.4°F) to 30.1°C (86.2°F), and average monthly lows oscillating between 18°C (64.4°F) and 23.7°C (74.7°F). The warmest months tend to be January and February, displaying the city's characteristic warm summer Mediterranean climate.

Rainfall in Saint-Denis appears to be significant and more frequent during the beginning of the year, reducing gradually as the year progresses. January sees the highest rainfall at 351mm (13.82") and December the second highest at 189mm (7.44"). The driest month appears to be October with a significantly lower rainfall of only 43mm (1.69"), indicating a quite marked wet-dry season trend.

The UV index in Saint-Denis is notably high throughout the year, peaking at a maximum index of 12 from January to March, and again in November and December, owing to the city's proximity to the equator.

The best time to visit Saint-Denis

Considering cumulative parameters like temperature, sunshine hours, UV index, and rainfall, the most favorable time to visit Saint-Denis tends to be between May and October. During these months, the city experiences less rainfall (ranging from 58mm (2.28") to 43mm (1.69") per month), pleasant temperatures (with highs from 25.8°C (78.4°F) to 27.5°C (81.5°F) and lows from 18°C (64.4°F) to 20.6°C (69.1°F)), and relatively low UV index levels (from 6 in June and July to 10 in October).

The worst time to visit Saint-Denis

The period of January to March is considered less favorable for visiting Saint-Denis. During these months, the city experiences its highest rainfall (from 233mm (9.17") in March to 351mm (13.82") in February), coupled with high temperatures (with highs from 29.7°C (85.5°F) to 30.1°C (86.2°F) and lows from 23.2°C (73.8°F) to 23.7°C (74.7°F)). Moreover, the UV index reaches its peak of 12 during these months, requiring precautions for sun exposure.

Spring weather in Saint-Denis

In Saint-Denis, spring occurs between September and November. During this time, the city experiences an increase in temperature, with highs ranging from 25.8°C (78.4°F) to 28°C (82.4°F) and lows from 18.6°C (65.5°F) to 20.9°C (69.6°F). The rainfall amount also begins to increase, starting from 50mm (1.97") in September to 70mm (2.76") in November. Sunshine hours remain steady around 7.1 hours per day, providing ample daylight for outdoor activities.

Summer weather in Saint-Denis

Summer in Saint-Denis spans from December to February, bringing with it the warmest temperatures and the highest amount of rainfall. The high temperatures reach between 29.1°C (84.4°F) and 30.1°C (86.2°F), and lows from 22.4°C (72.3°F) to 23.7°C (74.7°F). Rainfall during this season is quite heavy, with amounts from 189mm (7.44") to 351mm (13.82") across the months, and the city also experiences the peak UV index of 12.

Autumn weather in Saint-Denis

Autumn occurs between March and May in Saint-Denis. The weather gradually cools down in these months, with high temperatures declining from 29.1°C (84.4°F) to 27.5°C (81.5°F) and lows from 22.1°C (71.8°F) to 20.6°C (69.1°F). Rainfall also starts to decrease, moving from 233mm (9.17") in March to 98mm (3.86") in May. Sunshine hours hover around 7.1 hours to 7.4 hours a day, presenting a decent amount of daylight.

Winter weather in Saint-Denis

Winter in Saint-Denis runs from June to August, and is the coolest and driest season. High temperatures are from 25.2°C (77.4°F) to 26.1°C (79°F), and lows range from 18°C (64.4°F) to 18.9°C (66°F). Rainfall during winter months drops to its lowest, reaching 58mm (2.28") in June and August. Sunshine hours stay consistent around 7.1 hours, and the UV index lowers to a minimum of 8 in August, providing a more comfortable atmosphere.

Weather in January

January is a month of mixed weather in Saint-Denis, Reunion. It usually experiences the hottest day and night temperatures, peaking at 30.1°C (86.2°F) and not falling below 23.5°C (74.3°F). An abundance of rainfall, reaching up to 279mm (10.98"), characterizes this month, providing the verdant landscape with vital humidity. Weather in January »

Weather in February

In the heart of the first quarter, February holds its own in terms of weather patterns. The city, Saint-Denis, continues to experience hot temperatures, similar to January, while the rainfall increases to a maximum 351mm (13.82"). Weather in February »

Weather in March

Transitioning into March, Saint-Denis undergoes a slight change in weather dynamics. The temperatures start to slowly cool down, with the highest averaging 29.7°C (85.5°F) and the lowest averaging 23.2°C (73.8°F). Rainfall begins to decrease, settling at 233mm (9.17"), which can make outdoor excursions more appealing. Weather in March »

Weather in April

April in Saint-Denis depicts a balance between contrasting weather elements. A further decrease in temperature is observed, with highs falling to 29.1°C (84.4°F) and lowest temperatures dropping to 22.1°C (71.8°F). There is significant reduction in rainfall to 154mm (6.06"). Weather in April »

Weather in May

May ushers in noticeably cooler temperatures to the delight of those seeking moderate weather conditions. The coastal hub of Saint-Denis benefits from a lower UV index, presenting more safe hours in the day for tourists and locals to explore. Weather in May »

Weather in June

As the halfway point of the year, June represents the coldest month in Saint-Denis, Reunion, with temperatures decreasing further and heat giving way to cooler days and nights. Rainfall also decreases to 77mm (3.03") making the city less soggy compared to the months of the year so far. Weather in June »

Weather in July

July continues the trend of cool temperatures and reduced rainfall in Saint-Denis. A noticeable drop in sea temperature can be observed, implying cooler maritime currents along the shores. Despite lesser daylight hours, city life does not wane. Weather in July »

Weather in August

In August, the city’s weather reveals a slight wrinkle as the temperatures plateau at a more consistent rate between day and night. Rainfall is nearly identical as the preceding month. With the receding high temperatures, tourists may find the weather more resilient to their itineraries. Weather in August »

Weather in September

September represents a moderate weather month for Saint-Denis with temperatures presenting a small hike in comparison to the past month. Rainfall reaches its lowest point for the year, merely 50mm (1.97"). September therefore serves as a welcoming gateway to the year’s end, setting a premium for open-air activities and scenic excursions. Weather in September »

Weather in October

October provides an upward turn to the weather cycle in Saint-Denis. A slight increase in temperatures is observed, while the amount of rainfall remains relatively low with only 43mm (1.69") recorded. The warmth returns slowly, and the city readopts the lively, outdoor spirit characteristic of its hotter months. Weather in October »

Weather in November

November brings a sense of familiarity as there is a noticeable rise in temperatures. The episode of low rainfall subsides as November receives rainfall totaling up to 70mm (2.76"). The sunlight offers a warm touch during the day, making it ideal for picnics or outdoor brunches. Weather in November »

Weather in December

December concludes the weather calendar of Saint-Denis with variable elements. Temperatures take their last hike for the year and moderate rainfall resumes. The sea temperatures also begin to rise, highlighting a warming trend in anticipation of the upcoming first quarter. Weather in December »

Frequently asked questions

What are the warmest months in Saint-Denis?

January and February are identified as the warmest months in Saint-Denis, Reunion, with an average high-temperature of 30.1°C (86.2°F).

How much does it rain in Saint-Denis?

In Saint-Denis, during the entire year, the rain falls for 119.3 days and collects up to 1659mm (65.31") of precipitation.

What are the months with the least sunshine in Saint-Denis?

January and October, with an average of 6.8h of sunshine, are months with the least sunshine in Saint-Denis.

When is the highest UV index in Saint-Denis?

January through March, November and December, with an average maximum UV index of 12, are months with the highest UV index.

What is the rainiest month in Saint-Denis?

The month with the most rainfall is February, when the rain falls for 14.3 days and typically aggregates up to 351mm (13.82") of precipitation.

What is the month with the warmest sea water in Saint-Denis?

With an average sea temperature of 28.5°C (83.3°F), March is the month with the warmest seawater in Saint-Denis, Reunion.

What are the months with the most sunshine in Saint-Denis?

The months with the most sunshine in Saint-Denis, Reunion, are April and December, with an average of 7.4h of sunshine.

What is the month with the shortest days in Saint-Denis?

The month with the shortest days is June, with an average of 10h and 54min of daylight.

When is the lowest UV index in Saint-Denis?

June and July, with an average maximum UV index of 6, are months with the lowest UV index.

What time of the year is the coldest in Saint-Denis?

July is the coldest month of the year in Saint-Denis, Reunion, registering average temperatures as high as 25.2°C (77.4°F) and as low as 18.1°C (64.6°F).

When is the sea coldest in Saint-Denis?

August and September, with an average sea temperature of 23.8°C (74.8°F), are months with the coldest seawater in Saint-Denis.

What is the driest month in Saint-Denis?

October is the month with the least rainfall in Saint-Denis. Rain falls for 7.1 days and accumulates 43mm (1.69") of precipitation.

When are the longest days in Saint-Denis?

With an average of 13h and 24min of daylight, December has the longest days of the year in Saint-Denis.

Is there Daylight Saving Time (DST) in Saint-Denis?

Saint-Denis, Reunion, does not utilize Daylight Saving Time (DST). +04 timezone is used over the entire year.

Average temperature
Saint-Denis, Reunion

Average temperature - Saint-Denis, Reunion

The warmest months (with the highest average high temperature) are January and February (30.1°C).
The month with the lowest average high temperature is July (25.2°C).

The month with the highest average low temperature is February (23.7°C).
The coldest month (with the lowest average low temperature) is August (18°C).


Average rainfall
Saint-Denis, Reunion

Average rainfall - Saint-Denis, Reunion

The wettest month (with the highest rainfall) is February (351mm).
The driest month (with the least rainfall) is October (43.4mm).


Average rainfall days
Saint-Denis, Reunion

Average rainfall days - Saint-Denis, Reunion

The month with the highest number of rainy days is February (14.3 days).
The month with the least rainy days is November (5.9 days).


Average sea temperature
Saint-Denis, Reunion

Average sea temperature - Saint-Denis, Reunion

The best month for swimming (with the highest average sea temperature) is March (28.5°C).
The coldest months (with the lowest average sea temperature) are August and September (23.8°C).


Average daylight / Average sunshine
Saint-Denis, Reunion

Average daylight / Average sunshine - Saint-Denis, Reunion

The month with the longest days is December (Average daylight: 13h and 24min).
The month with the shortest days is June (Average daylight: 10h and 54min).

The months with the most sunshine are April and December (Average sunshine: 7h and 24min).
The months with the least sunshine are January and October (Average sunshine: 6h and 48min).


Average UV index
Saint-Denis, Reunion

Average UV index - Saint-Denis, Reunion

The months with the highest UV index are January, February, March, November and December (UV index 12).
The months with the lowest UV index are June and July (UV index 6).


Saint-Denis, Reunion

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