Colonia del Sacramento weather in September

In September, Colonia del Sacramento sees average daytime highs of 17°C and overnight lows near 12°C, with 81 mm of rain across 7.6 wet days and about 11.8 hours of daylight. It is the 9th-warmest and 8th-wettest month of the year here.

Highs climb over the month, from about 16°C in the first days to 18°C by the end. The sky is clear or mostly clear about 37% 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 Colonia del Sacramento's 8th-clearest and 1st-windiest month. For the whole year in context, see Colonia del Sacramento's year-round climate.

Daytime high
17°
9th warmest
Overnight low
12°
4th coldest
Rainfall
81 mm
7.6 wet days
Daylight
11 h 48 min
7:52 AM – 7:39 PM
Cloud cover
53%
8th clearest
Wind
18 km/h
1st windiest
Solar energy
4.56 kWh/m²
Travel score
5.8
out of 10

Colonia del Sacramento is City in Uruguay, departmental capital of Colonia.

Density
1,407/km²
people per km²
Founded
1680

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 16°C in the first days to 18°C by the end.

A typical September day in Colonia del Sacramento reaches about 17°C in the afternoon and slips back to 12°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 21°C. Set against its neighbours, September runs about 2°C warmer than August and about 3°C cooler than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
11611
21611
31611
41611
51611
61611
71611
81611
91711
101711
111711
121711
131711
141711
151711
161712
171712
181712
191712
201712
211712
221712
231812
241812
251812
261812
271812
281812
291813
301813

Colonia del Sacramento 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
Jan27° / 21°816.9147.3
Feb26° / 20°1038.113.37.1
Mar24° / 19°1017.612.37.5
Apr21° / 15°977.911.26.9
May17° / 12°706.610.26.0
Jun14° / 10°717.29.74.5
Jul13° / 746.89.94.1
Aug15° / 10°756.710.75.1
Sep17° / 12°817.611.85.8
Oct20° / 14°1119.412.96.5
Nov23° / 17°1027.913.87.3
Dec26° / 19°847.714.37.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 48%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14951
24951
35050
45050
55050
65149
75149
85248
95248
105347
115446
125545
135545
145545
155545
165545
175446
185545
195545
205446
215347
225347
235347
245347
255149
265149
275050
285050
295050
305050

Chance of precipitation in September

Any precipitation

Colonia del Sacramento gets around 81 mm of rain over 7.6 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 25% and peaks near 28% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
126
226
326
426
526
626
726
826
925
1025
1124
1224
1324
1424
1523
1623
1723
1823
1923
2024
2124
2224
2325
2425
2526
2626
2727
2827
2927
3028

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 78% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1801550
2801550
3811540
4811540
5811540
6811540
7811540
8801640
9791650
10791650
11791650
12791650
13791650
14791551
15791551
16791551
17791551
18791551
19791551
20791551
21801541
22791641
23781741
24781741
25771841
26751951
27752050
28742150
29722260
30712360

Wind in September

Winds average 18 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 18 km/h on the calmest days to 18 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
118light breeze
218light breeze
318light breeze
418light breeze
518light breeze
618light breeze
718light breeze
818light breeze
918light breeze
1018light breeze
1118light breeze
1218light breeze
1318light breeze
1418light breeze
1518light breeze
1618light breeze
1718light breeze
1818light breeze
1918light breeze
2018light breeze
2118light breeze
2218light breeze
2318light breeze
2418light breeze
2518light breeze
2618light breeze
2718light breeze
2818light breeze
2918light breeze
3018light 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 8:14 AM to 7:32 AM, and sunset from 7:28 PM to 7:50 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.28:147:28
211.38:127:29
311.38:117:30
411.48:107:31
511.48:087:31
611.48:077:32
711.58:057:33
811.58:047:33
911.58:027:34
1011.68:017:35
1111.67:597:36
1211.67:587:36
1311.77:567:37
1411.77:557:38
1511.87:547:39
1611.87:527:39
1711.87:517:40
1811.97:497:41
1911.97:487:42
2011.97:467:42
2112.07:457:43
2212.07:437:44
2312.07:427:44
2412.17:407:45
2512.17:397:46
2612.27:377:47
2712.27:367:47
2812.27:347:48
2912.37:337:49
3012.37:327:50

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.56 kWh/m².

For context, solar energy here swings from a low near 2.29 kWh/m² to a high of 7.57 kWh/m² in December across the year — September's 4.56 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
13.9Moderate
23.9Moderate
34.0Moderate
44.0Moderate
54.0Bright
64.1Bright
74.2Bright
84.2Bright
94.3Bright
104.3Bright
114.4Bright
124.4Bright
134.5Bright
144.5Bright
154.6Bright
164.6Bright
174.7Bright
184.7Bright
194.8Bright
204.8Bright
214.8Bright
224.8Bright
234.9Bright
244.9Bright
254.9Bright
265.0Bright
275.0Bright
285.0Bright
295.0Bright
305.1Bright
Planning a trip in September

Is September a good time to visit Colonia del Sacramento?

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

5.8
Sightseeing
9th-best month of the year
1.4
Beach & pool
9th-best month of the year

September is a reasonable time to visit Colonia del Sacramento for sightseeing.

What to pack for Colonia del Sacramento in September

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

In September, Colonia del Sacramento sees daytime highs around 17°C and nights near 12°C. Worth packing: sun protection. About 8 days see rain.

sun protection

Sea temperature near Colonia del Sacramento in September

The nearest coast averages about 15°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 January at about 25°C and coldest in July near 13°C.

It's comfortable for a long swim from Nov 9 to Apr 19 — about 5.3 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swimcomfortable to swim
Sea temperature (°C)Comfort
Jan25Warm
Feb25Warm
Mar23Refreshing
Apr20Refreshing
May17Cool
Jun14Bracing
Jul13Bracing
Aug13Bracing
Sep15Bracing
Oct18Cool
Nov21Refreshing
Dec23Refreshing

UV index in Colonia del Sacramento 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 Colonia del Sacramento peaks around January 15 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 19 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateHighVery highExtremeJan 15UV 13Jun 19UV 3
UV index (midday)Level
Jan13Extreme
Feb11Extreme
Mar10Very high
Apr6High
May4Moderate
Jun3Moderate
Jul3Moderate
Aug4Moderate
Sep6High
Oct8Very high
Nov11Extreme
Dec12Extreme
Location & terrain

Where is Colonia del Sacramento?

Colonia del Sacramento sits at 34.5°S, 57.8°W, 30 m above sea level, in Uruguay. The nearest listed city is Ensenada, 45 km away.

EnsenadaBerissoQuilmesBerazateguiRetiroBuenos AiresLa PlataSarandí

Topography around Colonia del Sacramento

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

Within 3 km, the terrain around Colonia del Sacramento has only modest variations in elevation — a maximum elevation change of 48 m around an average of 7 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 87 m; within 80 km, only modest variations in elevation — a maximum elevation change of 189 m.

The land around Colonia del Sacramento is covered by water (49%) within 3 km, water (65%) within 16 km, and water (37%), grassland (23%) and cropland (23%) within 80 km.

3 km
48 m
16 km
87 m
80 km
189 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Ensenada 45 km · Berisso 46 km · Quilmes 48 km · Berazategui 48 km · Retiro 52 km · Buenos Aires 52 km · La Plata 52 km · Sarandí 52 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 Colonia del Sacramento (-34.4626°, -57.8398°, elevation 30 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).