Climate and monthly weather forecastSaint-Denis, Reunion
Climate and monthly weather forecast
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 »Updated: Feb 5, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
In Saint-Denis, during the entire year, the rain falls for 119.3 days and collects up to 1659mm (65.31") of precipitation.
January and October, with an average of 6.8h of sunshine, are months with the least sunshine in Saint-Denis.
January through March, November and December, with an average maximum UV index of 12, are months with the highest UV index.
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.
With an average sea temperature of 28.5°C (83.3°F), March is the month with the warmest seawater in Saint-Denis, Reunion.
The months with the most sunshine in Saint-Denis, Reunion, are April and December, with an average of 7.4h of sunshine.
The month with the shortest days is June, with an average of 10h and 54min of daylight.
June and July, with an average maximum UV index of 6, are months with the lowest UV index.
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).
August and September, with an average sea temperature of 23.8°C (74.8°F), are months with the coldest seawater 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.
With an average of 13h and 24min of daylight, December has the longest days of the year 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
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 in January:
278.6mm - Average rainfall in February:
351mm - Average rainfall in March:
232.5mm - Average rainfall in April:
154.3mm - Average rainfall in May:
97.6mm - Average rainfall in June:
76.9mm
- Average rainfall in July:
57.8mm - Average rainfall in August:
57.8mm - Average rainfall in September:
50mm - Average rainfall in October:
43.4mm - Average rainfall in November:
70mm - Average rainfall in December:
188.7mm
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 in January:
13.3 days - Average rainfall days in February:
14.3 days - Average rainfall days in March:
13 days - Average rainfall days in April:
11.3 days - Average rainfall days in May:
9.6 days - Average rainfall days in June:
7.2 days
- Average rainfall days in July:
8.8 days - Average rainfall days in August:
9.6 days - Average rainfall days in September:
8.1 days - Average rainfall days in October:
7.1 days - Average rainfall days in November:
5.9 days - Average rainfall days in December:
11.1 days
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
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 in January:
13h and 12min - Average daylight in February:
12h and 48min - Average daylight in March:
12h and 12min - Average daylight in April:
11h and 36min - Average daylight in May:
11h and 6min - Average daylight in June:
10h and 54min
- Average daylight in July:
11h and 0min - Average daylight in August:
11h and 24min - Average daylight in September:
12h and 0min - Average daylight in October:
12h and 36min - Average daylight in November:
13h and 6min - Average daylight in December:
13h and 24min
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).
- Average sunshine in January:
6h and 48min - Average sunshine in February:
7h and 12min - Average sunshine in March:
6h and 54min - Average sunshine in April:
7h and 24min - Average sunshine in May:
6h and 54min - Average sunshine in June:
7h and 6min
- Average sunshine in July:
7h and 6min - Average sunshine in August:
6h and 54min - Average sunshine in September:
7h and 6min - Average sunshine in October:
6h and 48min - Average sunshine in November:
7h and 6min - Average sunshine in December:
7h and 24min
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
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).
