Piriapolis weather in September

In September, Piriapolis sees average daytime highs of 17°C and overnight lows near 10°C, with 91 mm of rain across 8.3 wet days and about 11.8 hours of daylight. It is the 9th-warmest and 6th-wettest month of the year here.

Day-to-day highs hold fairly steady near 17°C through the month. The sky is clear or mostly clear about 30% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 12 min at the start of September to 12 h 18 min by month's end. Set against the rest of the year, September is Piriapolis's 10th-clearest and 1st-windiest month. For the whole year in context, see Piriapolis's year-round climate.

Daytime high
17°
9th warmest
Overnight low
10°
4th coldest
Rainfall
91 mm
8.3 wet days
Daylight
11 h 48 min
7:42 AM – 7:29 PM
Cloud cover
60%
10th clearest
Wind
16 km/h
1st windiest
Solar energy
4.22 kWh/m²
Travel score
5.6
out of 10

Piriapolis is city of Uruguay.

Density
319/km²
people per km²
Founded
1893

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 17°C through the month.

A typical September day in Piriapolis reaches about 17°C in the afternoon and slips back to 10°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 12°C and 22°C. Set against its neighbours, September runs about 1°C warmer than August and about 3°C cooler than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
1169
2169
3169
4169
5169
6169
7169
8169
9169
10179
11179
12179
13179
14179
15179
16179
171710
181710
191710
201710
211710
221710
231710
241710
251810
261810
271810
281810
291810
301811

Piriapolis weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 18°707.614.17.2
Feb26° / 18°978.913.36.9
Mar24° / 17°95912.37.2
Apr21° / 14°998.611.16.8
May18° / 11°767.910.26.0
Jun15° / 898.39.74.7
Jul14° / 908.79.94.3
Aug16° / 938.610.75.1
Sep17° / 10°918.311.85.6
Oct20° / 12°999.412.96.3
Nov22° / 14°857.813.87.2
Dec25° / 16°808.514.37.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 55%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14357
24357
34456
44456
54456
64456
74456
84456
94555
104555
114654
124654
134654
144654
154654
164654
174654
184654
194654
204555
214555
224555
234555
244456
254456
264456
274456
284456
294456
304456

Chance of precipitation in September

Any precipitation

Piriapolis gets around 91 mm of rain over 8.3 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 28% and peaks near 29% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
128
228
328
428
529
629
729
829
929
1029
1129
1228
1328
1428
1527
1627
1727
1826
1926
2026
2126
2226
2326
2426
2527
2627
2728
2828
2929
3029

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 82% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1821431
2831331
3831331
4831331
5831331
6831331
7831331
8841330
9841330
10841330
11841330
12841330
13841330
14841240
15841240
16851230
17851230
18851230
19841330
20841330
21831430
22831430
23821530
24811630
25801730
26791830
27791830
28771940
29762040
30752140

Wind in September

Winds average 16 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 16 km/h on the calmest days to 16 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
116light breeze
216light breeze
316light breeze
416light breeze
516light breeze
616light breeze
716light breeze
816light breeze
916light breeze
1016light breeze
1116light breeze
1216light breeze
1316light breeze
1416light breeze
1516light breeze
1616light breeze
1716light breeze
1816light breeze
1916light breeze
2016light breeze
2116light breeze
2216light breeze
2316light breeze
2416light breeze
2516light breeze
2616light breeze
2716light breeze
2816light breeze
2916light breeze
3016light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 12 min at the start of September to 12 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 66 minutes over September. Sunrise moves from 8:04 AM to 7:21 AM, and sunset from 7:18 PM to 7:40 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.28:047:18
211.38:027:19
311.38:017:19
411.38:007:20
511.47:587:21
611.47:577:22
711.57:557:22
811.57:547:23
911.57:527:24
1011.67:517:24
1111.67:497:25
1211.67:487:26
1311.77:467:27
1411.77:457:27
1511.77:437:28
1611.87:427:29
1711.87:407:30
1811.97:397:30
1911.97:377:31
2011.97:367:32
2112.07:347:33
2212.07:337:33
2312.07:317:34
2412.17:307:35
2512.17:287:36
2612.27:277:37
2712.27:267:37
2812.27:247:38
2912.37:237:39
3012.37:217:40

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.22 kWh/m².

For context, solar energy here swings from a low near 2.15 kWh/m² to a high of 7.32 kWh/m² in December across the year — September's 4.22 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
13.6Moderate
23.6Moderate
33.6Moderate
43.7Moderate
53.7Moderate
63.8Moderate
73.8Moderate
83.9Moderate
93.9Moderate
104.0Moderate
114.0Bright
124.1Bright
134.1Bright
144.2Bright
154.2Bright
164.3Bright
174.3Bright
184.3Bright
194.4Bright
204.4Bright
214.5Bright
224.5Bright
234.5Bright
244.6Bright
254.6Bright
264.6Bright
274.6Bright
284.7Bright
294.7Bright
304.7Bright
Planning a trip in September

Is September a good time to visit Piriapolis?

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

5.6
Sightseeing
9th-best month of the year
1.3
Beach & pool
9th-best month of the year

September is a reasonable time to visit Piriapolis for sightseeing.

What to pack for Piriapolis in September

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

In September, Piriapolis sees daytime highs around 17°C and nights near 10°C. Worth packing: a warm layer and rain gear. About 8 days see rain.

a warm layerrain gear

Sea temperature near Piriapolis in September

The nearest coast averages about 13°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 23°C and coldest in July near 11°C.

It's comfortable for a long swim from Dec 9 to Apr 10 — about 4 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan22Refreshing
Feb23Refreshing
Mar22Refreshing
Apr20Cool
May17Cool
Jun13Bracing
Jul11Bracing
Aug12Bracing
Sep13Bracing
Oct16Cool
Nov18Cool
Dec21Refreshing

UV index in Piriapolis in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September 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 Piriapolis peaks around January 16 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 18 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateHighVery highExtremeJan 16UV 12Jun 18UV 2
UV index (midday)Level
Jan12Extreme
Feb12Extreme
Mar10Very high
Apr6High
May3Moderate
Jun2Moderate
Jul3Moderate
Aug4Moderate
Sep6High
Oct8Very high
Nov11Extreme
Dec12Extreme
Location & terrain

Where is Piriapolis?

Piriapolis sits at 34.9°S, 55.3°W, 0 m above sea level, in Uruguay. The nearest listed city is Maldonado, 30 km away.

MaldonadoPunta del EsteSan CarlosMinasPandoBarros BlancosPaso de CarrascoMontevideo

Topography around Piriapolis

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

Within 3 km, the terrain around Piriapolis has only modest variations in elevation — a maximum elevation change of 249 m around an average of 32 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 501 m; within 80 km, significant variations in elevation — a maximum elevation change of 494 m.

The land around Piriapolis is covered by trees (31%), water (28%) and grassland (21%) within 3 km, water (55%) and grassland (24%) within 16 km, and grassland (42%) and water (38%) within 80 km.

3 km
249 m
16 km
501 m
80 km
494 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Maldonado 30 km · Punta del Este 32 km · San Carlos 34 km · Minas 54 km · Pando 65 km · Barros Blancos 68 km · Paso de Carrasco 71 km · Montevideo 83 km

Uruguay travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F / I / L
230 V · 50 Hz
Prices
≈ 66% of US
price level, 2025
GDP per capita
$25,216
2025
Happiness
6.6 / 10
World Happiness, 2025
Homicide rate
11.2
per 100k, 2023
Road deaths
14.8
per 100k/yr, 2019
Income group
High
World Bank
English
Moderate
EF EPI 542
Religion
none 47%Roman Catholic 37%Protestant 15%atheist 10%

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 Piriapolis (-34.8629°, -55.2747°, elevation 0 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. 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).