San Carlos weather in September

In September, San Carlos sees average daytime highs of 17°C and overnight lows near 9°C, with 90 mm of rain across 8.5 wet days and about 11.8 hours of daylight. It is the 9th-warmest and 8th-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 San Carlos's 9th-clearest and 1st-windiest month. For the whole year in context, see San Carlos's year-round climate.

Daytime high
17°
9th warmest
Overnight low
4th coldest
Rainfall
90 mm
8.5 wet days
Daylight
11 h 48 min
7:40 AM – 7:28 PM
Cloud cover
60%
9th clearest
Wind
17 km/h
1st windiest
Solar energy
4.27 kWh/m²
Travel score
5.6
out of 10

San Carlos is city in the Maldonado Department of southern Uruguay.

Density
2,753/km²
people per km²
Founded
1763

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 San Carlos reaches about 17°C in the afternoon and slips back to 9°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
3179
4179
5179
6179
7179
8179
9179
10179
11179
12179
13179
14179
15179
16179
17179
18179
19179
201710
211710
221710
231710
241710
251710
261810
271810
281810
291810
301810

San Carlos weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 18°788.314.17.1
Feb26° / 18°99913.36.8
Mar24° / 17°92912.37.2
Apr21° / 14°1048.911.26.7
May18° / 11°837.910.26.0
Jun15° / 918.79.74.7
Jul14° / 9499.94.3
Aug16° / 958.510.75.1
Sep17° / 908.511.85.6
Oct19° / 12°1029.712.96.3
Nov22° / 14°908.313.87.0
Dec25° / 16°828.514.37.3

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 (%)
14159
24159
34258
44258
54258
64357
74357
84456
94555
104555
114555
124555
134654
144654
154654
164654
174654
184753
194654
204654
214753
224654
234654
244555
254654
264555
274456
284555
294555
304654

Chance of precipitation in September

Any precipitation

San Carlos gets around 90 mm of rain over 8.5 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 30% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
130
230
330
430
530
630
730
830
929
1029
1129
1228
1328
1427
1527
1627
1726
1826
1926
2026
2126
2226
2327
2427
2528
2628
2728
2829
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
2821431
3831331
4831331
5831331
6841330
7841330
8841330
9841330
10831340
11831340
12831340
13831340
14841240
15841240
16841240
17841240
18841240
19851230
20851230
21841330
22841330
23831430
24821530
25821530
26811630
27801730
28791830
29771940
30771940

Wind in September

Winds average 17 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 17 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
117light breeze
217light breeze
317light breeze
417light breeze
517light breeze
617light breeze
717light breeze
817light breeze
917light breeze
1017light breeze
1117light breeze
1217light breeze
1317light breeze
1417light breeze
1517light breeze
1617light breeze
1717light breeze
1817light breeze
1917light breeze
2017light breeze
2117light breeze
2217light breeze
2317light breeze
2417light breeze
2517light breeze
2617light breeze
2717light breeze
2817light breeze
2917light breeze
3017light 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 8:02 AM to 7:20 AM, and sunset from 7:16 PM to 7:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.28:027:16
211.38:017:17
311.38:007:18
411.37:587:19
511.47:577:19
611.47:557:20
711.57:547:21
811.57:527:22
911.57:517:22
1011.67:497:23
1111.67:487:24
1211.67:467:25
1311.77:457:25
1411.77:437:26
1511.77:427:27
1611.87:407:28
1711.87:397:28
1811.97:377:29
1911.97:367:30
2011.97:347:31
2112.07:337:31
2212.07:317:32
2312.07:307:33
2412.17:297:34
2512.17:277:34
2612.27:267:35
2712.27:247:36
2812.27:237:37
2912.37:217:37
3012.37:207:38

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.27 kWh/m².

For context, solar energy here swings from a low near 2.16 kWh/m² to a high of 7.38 kWh/m² in December across the year — September's 4.27 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
104.0Bright
114.0Bright
124.1Bright
134.2Bright
144.2Bright
154.3Bright
164.3Bright
174.4Bright
184.4Bright
194.5Bright
204.5Bright
214.5Bright
224.6Bright
234.6Bright
244.7Bright
254.7Bright
264.7Bright
274.7Bright
284.8Bright
294.8Bright
304.8Bright
Planning a trip in September

Is September a good time to visit San Carlos?

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 San Carlos for sightseeing.

What to pack for San Carlos in September

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

In September, San Carlos sees daytime highs around 17°C and nights near 9°C. Worth packing: a warm layer and rain gear. About 9 days see rain.

a warm layerrain gear

Sea temperature near San Carlos 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 at the nearest coast (about 21 km away) is warmest in February at about 23°C and coldest in July near 12°C.

It's comfortable for a long swim from Dec 12 to Apr 10 — about 3.9 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan22Refreshing
Feb23Refreshing
Mar22Refreshing
Apr20Cool
May17Cool
Jun14Bracing
Jul12Bracing
Aug12Bracing
Sep13Bracing
Oct15Cool
Nov18Cool
Dec20Refreshing

UV index in San Carlos 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 San Carlos peaks around January 17 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 17UV 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 San Carlos?

San Carlos sits at 34.8°S, 54.9°W, 28 m above sea level, in Uruguay. The nearest listed city is Maldonado, 12 km away.

PiriapolisMinasRochaLa PalomaPandoBarros Blancos

Topography around San Carlos

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

Within 3 km, the terrain around San Carlos has only modest variations in elevation — a maximum elevation change of 42 m around an average of 11 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 266 m; within 80 km, significant variations in elevation — a maximum elevation change of 498 m.

The land around San Carlos is covered by grassland (45%) and trees (22%) within 3 km, grassland (60%) within 16 km, and grassland (42%) and water (37%) within 80 km.

3 km
42 m
16 km
266 m
80 km
498 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Maldonado 12 km · Punta del Este 17 km · Piriapolis 34 km · Minas 55 km · Rocha 64 km · La Paloma 70 km · Pando 95 km · Barros Blancos 99 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 San Carlos (-34.7912°, -54.9182°, elevation 28 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).