Saint-Denis weather in July

In July, Saint-Denis sees average daytime highs of 21°C and overnight lows near 16°C, with 36 mm of rain across 11.9 wet days and about 10.9 hours of daylight. It is the 12th-warmest and 10th-wettest month of the year here.

Day-to-day highs hold fairly steady near 21°C through the month. The sky is clear or mostly clear about 54% of the time in July, and the air most often feels comfortable.

Daylight stretches from about 10 h 42 min at the start of July to 11 hours by month's end. Set against the rest of the year, July is Saint-Denis's 1st-clearest and 2nd-windiest month. For the whole year in context, see Saint-Denis's year-round climate.

Daytime high
21°
12th warmest
Overnight low
16°
2nd coldest
Rainfall
36 mm
11.9 wet days
Daylight
10 h 48 min
6:58 AM – 5:49 PM
Cloud cover
41%
1st clearest
Wind
9 km/h
2nd windiest
Solar energy
4.12 kWh/m²
Travel score
6.5
out of 10

Saint-Denis is French commune in Réunion.

Density
1,084/km²
people per km²
Founded
1669

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in July

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 21°C through the month.

A typical July day in Saint-Denis reaches about 21°C in the afternoon and slips back to 16°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 22°C. Set against its neighbours, July runs about 1°C cooler than June and on par with August.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
12116
22116
32116
42116
52116
62116
72116
82116
92116
102116
112116
122116
132116
142116
152116
162116
172116
182116
192116
202116
212116
222116
232116
242116
252116
262116
272116
282116
292116
302116
312116

Saint-Denis weather by month

How July compares with the rest of the year at a glance. July is the 12th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 22°25121.713.14.9
Feb26° / 22°24421.912.74.5
Mar26° / 22°2192212.15.0
Apr25° / 21°7816.711.55.8
May23° / 19°7416116.2
Jun21° / 17°401110.86.6
Jul21° / 16°3611.910.96.5
Aug21° / 16°341011.36.8
Sep21° / 17°3610.111.96.8
Oct23° / 18°471112.56.7
Nov24° / 19°8415.4136.1
Dec25° / 21°13818.913.25.4

Cloud cover in July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 54% of the time in July, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 31% of July, with mostly cloudy or overcast conditions the remaining 16%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
18515
28416
38416
48416
58416
68416
78416
88416
98416
108416
118515
128515
138515
148515
158515
168515
178515
188515
198416
208416
218416
228416
238416
248317
258317
268317
278317
288317
298317
308317
318317

Chance of precipitation in July

Any precipitation

Saint-Denis gets around 36 mm of rain over 11.9 wet days in July. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 38% and peaks near 40% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
139
239
339
439
540
640
740
840
940
1040
1140
1240
1340
1440
1540
1640
1739
1839
1939
2039
2138
2238
2337
2437
2536
2636
2735
2834
2934
3033
3133

Humidity in July

DryComfortableHumidMuggyOppressiveMiserable

Most of July feels comfortable — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, July lands in the comfortable band about 61% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
11760221
21762201
31862191
41863181
51963171
61963171
71964161
81964161
91965151
101965151
112064151
122064151
132064151
142063161
152163160
162162170
172162170
182162170
192161180
202260180
212260180
222259190
232358190
242358190
252457190
262457190
272556190
282656180
292656180
302755180
312756170

Wind in July

Winds average 9 km/h in July.

Across July, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm
319calm

Sunrise & sunset in July

DaylightNight

Daylight runs from about 10 h 42 min at the start of July to 11 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 18 minutes over July. Sunrise moves from 6:59 AM to 6:54 AM, and sunset from 5:44 PM to 5:55 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.76:595:44
210.76:595:44
310.86:595:45
410.86:595:45
510.86:595:45
610.86:595:46
710.86:595:46
810.86:595:46
910.86:595:47
1010.86:595:47
1110.86:595:47
1210.86:595:48
1310.86:595:48
1410.86:595:48
1510.86:595:49
1610.86:585:49
1710.96:585:50
1810.96:585:50
1910.96:585:50
2010.96:585:51
2110.96:575:51
2210.96:575:51
2310.96:575:52
2410.96:565:52
2510.96:565:53
2611.06:565:53
2711.06:555:53
2811.06:555:54
2911.06:545:54
3011.06:545:55
3111.06:545:55

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 4.12 kWh/m².

For context, solar energy here swings from a low near 3.95 kWh/m² to a high of 7.17 kWh/m² in December across the year — July's 4.12 kWh/m² sits near the bottom.

012345151015202531
Solar energy (kWh/m²)Level
13.9Moderate
24.0Moderate
34.0Moderate
44.0Moderate
54.0Moderate
64.0Moderate
74.0Moderate
84.0Bright
94.0Bright
104.0Bright
114.0Bright
124.1Bright
134.1Bright
144.1Bright
154.1Bright
164.1Bright
174.1Bright
184.2Bright
194.2Bright
204.2Bright
214.2Bright
224.2Bright
234.2Bright
244.3Bright
254.3Bright
264.3Bright
274.3Bright
284.4Bright
294.4Bright
304.4Bright
314.4Bright
Planning a trip in July

Hazard calendar for Saint-Denis

In seasonPeak

None of Saint-Denis's seasonal hazards are active in July. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Saint-Denis sits in the South Indian Ocean cyclone belt; the season peaks January–March.

Saint-Denis's monsoon runs December–March, when most of the year's rain falls.

Cyclone
Monsoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is July a good time to visit Saint-Denis?

Our two travel scores rate July for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

6.5
Sightseeing
5th-best month of the year
3.8
Beach & pool
12th-best month of the year

July is a reasonable time to visit Saint-Denis for sightseeing.

What to pack for Saint-Denis in July

From July's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In July, Saint-Denis sees daytime highs around 21°C and nights near 16°C. Worth packing: rain gear. About 12 days see rain.

rain gear

Sea temperature near Saint-Denis in July

The nearest coast averages about 24°C in July — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in February at about 28°C and coldest in August near 24°C.

The water stays above 20°C all year — warm enough for a swim any month.

22°24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan28Warm
Feb28Tropical
Mar28Tropical
Apr28Warm
May27Warm
Jun25Warm
Jul24Warm
Aug24Refreshing
Sep24Refreshing
Oct24Warm
Nov25Warm
Dec27Warm

UV index in Saint-Denis in July

LowModerateHighVery highExtreme

Clear-sky midday UV in July peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Saint-Denis peaks around January 18 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 23 at about 6 (high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighVery highExtremeJan 18UV 16Jun 23UV 6
UV index (midday)Level
Jan16Extreme
Feb15Extreme
Mar13Extreme
Apr10Very high
May8Very high
Jun6High
Jul6High
Aug9Very high
Sep10Extreme
Oct12Extreme
Nov13Extreme
Dec14Extreme
Location & terrain

Where is Saint-Denis?

Saint-Denis sits at 20.9°S, 55.5°E, 44 m above sea level, in Reunion. The nearest listed city is Sainte-Marie, 11 km away.

Sainte-MarieLa PossessionSainte-SuzanneLe PortSaint-AndréSaint-PaulSaint-BenoîtSaint-Leu

Topography around Saint-Denis

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Saint-Denis.

Within 3 km, the terrain around Saint-Denis has large variations in elevation — a maximum elevation change of 635 m around an average of 104 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,258 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,030 m.

The land around Saint-Denis is covered by water (40%), trees (33%) and artificial surfaces (24%) within 3 km, water (55%) and trees (34%) within 16 km, and water (78%) within 80 km.

3 km
635 m
16 km
2,258 m
80 km
3,030 m
treesgrasslandcroplandartificial surfacesbare terrainwater
July weather nearby: Sainte-Marie 11 km · La Possession 13 km · Sainte-Suzanne 17 km · Le Port 17 km · Saint-André 23 km · Saint-Paul 23 km · Saint-Benoît 33 km · Saint-Leu 36 km

Reunion travel facts

Power plugs
Type C / E
220 V · 50 Hz

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Saint-Denis (-20.8823°, 55.4504°, elevation 44 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).