Saint-Joseph weather in September

In September, Saint-Joseph sees average daytime highs of 22°C and overnight lows near 21°C, with 23 mm of rain across 4.9 wet days and about 11.9 hours of daylight. It is the 10th-warmest and 12th-wettest month of the year here.

Day-to-day highs hold fairly steady near 22°C through the month. The sky is clear or mostly clear about 81% of the time in September, and the air most often feels humid.

Daylight stretches from about 11 h 36 min at the start of September to 12 h 12 min by month's end. Set against the rest of the year, September is Saint-Joseph's 1st-clearest and 4th-windiest month. For the whole year in context, see Saint-Joseph's year-round climate.

Daytime high
22°
10th warmest
Overnight low
21°
3rd coldest
Rainfall
23 mm
4.9 wet days
Daylight
11 h 54 min
6:15 AM – 6:08 PM
Cloud cover
25%
1st clearest
Wind
23 km/h
4th windiest
Solar energy
5.88 kWh/m²
Travel score
8.0
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 22°C through the month.

A typical September day in Saint-Joseph reaches about 22°C in the afternoon and slips back to 21°C overnight — a 1°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 23°C. Set against its neighbours, September runs on par with August and about 1°C cooler than October.

15°18°20°23°25°151015202530
Avg high (°C)Avg low (°C)
12120
22220
32220
42220
52220
62220
72220
82220
92220
102220
112220
122220
132220
142220
152221
162221
172221
182221
192221
202221
212221
222221
232221
242221
252221
262221
272221
282221
292221
302221

Saint-Joseph weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 25°14412.713.26.3
Feb26° / 25°13413.112.76.1
Mar26° / 25°12511.212.26.7
Apr25° / 24°6310.211.57.1
May24° / 23°559.4117.6
Jun23° / 21°428.310.77.6
Jul22° / 20°419.110.87.3
Aug21° / 20°296.411.37.8
Sep22° / 21°234.911.98.0
Oct23° / 22°244.812.58.1
Nov24° / 23°456138.0
Dec25° / 24°769.213.37.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 81% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 12% of September, with mostly cloudy or overcast conditions the remaining 7%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1937
2937
3937
4937
5937
6937
7937
8937
9937
10937
11937
12937
13937
14937
15937
16937
17937
18937
19937
20937
21937
22946
23946
24946
25946
26937
27937
28937
29937
30919

Chance of precipitation in September

Any precipitation

Saint-Joseph gets around 23 mm of rain over 4.9 wet days in September, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 17% and peaks near 22% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
122
222
321
421
520
620
719
819
919
1019
1119
1218
1318
1418
1517
1617
1716
1816
1916
2015
2115
2215
2314
2414
2513
2613
2713
2813
2913
3013

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the humid band about 60% of days. Sticky, muggy-or-worse air turns up on roughly 14% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1330589
2230599
3230599
42305810
52305810
62295910
72295811
82295811
92285911
102285911
112285911
122276011
132276011
142266012
152266012
162256112
172246212
182236213
192226214
202216314
212206315
222196316
232186317
242186218
251176319
261176121
271166122
281166023
291155925
301155826

Wind in September

Winds average 23 km/h in September.

Across September, daily wind ranges from about 22 km/h on the calmest days to 24 km/h at its breeziest. It stays fairly steady from day to day.

0102030151015202530
Wind speed (km/h)Feels
124breezy
224breezy
324breezy
424breezy
524breezy
624breezy
723breezy
823breezy
923breezy
1023breezy
1123breezy
1223breezy
1323breezy
1422breezy
1522breezy
1622breezy
1722breezy
1822breezy
1922breezy
2022breezy
2122breezy
2222breezy
2322breezy
2422breezy
2522breezy
2622breezy
2722breezy
2822breezy
2922breezy
3022breezy

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 36 min at the start of September to 12 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 36 minutes over September. Sunrise moves from 6:30 AM to 6:02 AM, and sunset from 6:04 PM to 6:12 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.66:306:04
211.66:296:05
311.66:286:05
411.66:276:05
511.76:266:05
611.76:256:06
711.76:246:06
811.76:236:06
911.76:226:06
1011.86:216:07
1111.86:206:07
1211.86:196:07
1311.86:186:07
1411.86:176:08
1511.96:166:08
1611.96:156:08
1711.96:146:08
1811.96:136:09
1911.96:126:09
2012.06:116:09
2112.06:106:10
2212.06:096:10
2312.06:086:10
2412.06:076:10
2512.16:076:11
2612.16:066:11
2712.16:056:11
2812.16:046:11
2912.26:036:12
3012.26:026:12

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.88 kWh/m².

For context, solar energy here swings from a low near 3.86 kWh/m² to a high of 7.07 kWh/m² in November across the year — September's 5.88 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.4Bright
35.4Bright
45.5Bright
55.5Bright
65.5Bright
75.6Bright
85.6Bright
95.6Bright
105.7Bright
115.7Bright
125.8Bright
135.8Bright
145.8Bright
155.8Bright
165.9Bright
175.9Bright
186.0Bright
196.0Bright
206.0Intense
216.1Intense
226.1Intense
236.1Intense
246.2Intense
256.2Intense
266.2Intense
276.2Intense
286.3Intense
296.3Intense
306.3Intense
Planning a trip in September

Hazard calendar for Saint-Joseph

In seasonPeak

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

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

Saint-Joseph's rainy season runs December–March, when most of the year's rain falls.

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

Is September a good time to visit Saint-Joseph?

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

8.0
Sightseeing
2nd-best month of the year
5.4
Beach & pool
10th-best month of the year

September is one of the better times to visit Saint-Joseph for general sightseeing.

What to pack for Saint-Joseph in September

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

In September, Saint-Joseph sees daytime highs around 22°C and nights near 21°C. Worth packing: sun protection and a windbreaker. About 5 days see rain.

sun protectiona windbreaker

Sea temperature near Saint-Joseph in September

The nearest coast averages about 23°C in September — 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 23°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
Feb28Warm
Mar28Warm
Apr27Warm
May26Warm
Jun25Warm
Jul24Refreshing
Aug23Refreshing
Sep23Refreshing
Oct24Warm
Nov25Warm
Dec27Warm

UV index in Saint-Joseph in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Saint-Joseph peaks around January 17 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 10 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 17UV 16Jul 10UV 6
UV index (midday)Level
Jan17Extreme
Feb15Extreme
Mar13Extreme
Apr10Extreme
May8Very high
Jun6High
Jul6High
Aug9Very high
Sep10Extreme
Oct12Extreme
Nov13Extreme
Dec14Extreme
Location & terrain

Where is Saint-Joseph?

Saint-Joseph sits at 21.4°S, 55.6°E, 43 m above sea level, in Reunion. The nearest listed city is Saint-Pierre, 15 km away.

Saint-PierreLe TamponSaint-LouisPiton Saint-LeuSaint-BenoîtSaint-LeuSaint-AndréSainte-Suzanne

Topography around Saint-Joseph

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

Within 3 km, the terrain around Saint-Joseph has significant variations in elevation — a maximum elevation change of 486 m around an average of 108 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 2,407 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,030 m.

The land around Saint-Joseph is covered by trees (39%) and water (39%) within 3 km, water (53%) and trees (30%) within 16 km, and water (77%) within 80 km.

3 km
486 m
16 km
2,407 m
80 km
3,030 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Saint-Pierre 15 km · Le Tampon 15 km · Saint-Louis 24 km · Piton Saint-Leu 36 km · Saint-Benoît 39 km · Saint-Leu 41 km · Saint-André 46 km · Sainte-Suzanne 52 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-Joseph (-21.3777°, 55.6169°, elevation 43 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).