Montevideo weather in August

In August, Montevideo sees average daytime highs of 13°C and overnight lows near 11°C, with 97 mm of rain across 8.4 wet days and about 10.7 hours of daylight. It is the 11th-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 13°C through the month. The sky is clear or mostly clear about 35% of the time in August, and the air most often feels dry.

Daylight stretches from about 10 h 12 min at the start of August to 11 h 12 min by month's end. Set against the rest of the year, August is Montevideo's 9th-clearest and 10th-windiest month. For the whole year in context, see Montevideo's year-round climate.

Daytime high
13°
11th warmest
Overnight low
11°
2nd coldest
Rainfall
97 mm
8.4 wet days
Daylight
10 h 42 min
8:28 AM – 7:09 PM
Cloud cover
56%
9th clearest
Wind
22 km/h
10th windiest
Solar energy
3.22 kWh/m²
Travel score
3.9
out of 10

Montevideo is capital and largest city of Uruguay.

Air quality
Moderate
PM2.5 12 µg/m³ · 2018
Density
1,741/km²
people per km²
Founded
1726

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 13°C through the month.

A typical August day in Montevideo reaches about 13°C in the afternoon and slips back to 11°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 10°C and 17°C. Set against its neighbours, August runs about 1°C warmer than July and about 1°C cooler than September.

10°15°20°151015202531
Avg high (°C)Avg low (°C)
11210
21210
31310
41310
51310
61310
71310
81310
91310
101310
111310
121310
131310
141310
151310
161311
171311
181311
191411
201411
211411
221411
231411
241411
251411
261411
271411
281411
291411
301411
311411

Montevideo weather by month

How August compares with the rest of the year at a glance. August is the 11th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan24° / 21°675.814.18.0
Feb24° / 21°917.413.37.5
Mar22° / 20°977.812.37.3
Apr19° / 17°1078.411.16.5
May16° / 14°877.910.25.4
Jun14° / 11°908.69.74.0
Jul12° / 10°968.79.93.4
Aug13° / 11°978.410.73.9
Sep15° / 12°928.311.84.6
Oct17° / 14°1118.812.95.7
Nov20° / 17°1017.713.86.8
Dec22° / 19°736.814.37.5

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 35% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 13% of August, with mostly cloudy or overcast conditions the remaining 51%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14357
24456
34555
44555
54654
64852
74852
84951
95050
105050
115149
125248
135248
145248
155347
165248
175248
185248
195248
205050
215050
224951
234951
244951
254753
264753
274654
284654
294654
304555
314555

Chance of precipitation in August

Any precipitation

Montevideo gets around 97 mm of rain over 8.4 wet days in August. 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%151015202531
Rain chance (%)
126
226
326
426
526
626
726
826
926
1027
1127
1228
1328
1428
1528
1628
1728
1829
1929
2029
2129
2229
2329
2429
2529
2629
2729
2829
2929
3030
3130

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the dry band about 92% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19550
29550
39550
49640
59640
69550
79550
89550
99550
109550
119460
129460
139370
149370
159370
169280
179280
189091
199091
209091
219091
229091
239091
248992
258992
268992
278992
288992
298992
308992
318992

Wind in August

Winds average 22 km/h in August.

Across August, daily wind ranges from about 22 km/h on the calmest days to 23 km/h at its breeziest. It stays fairly steady from day to day.

0102030151015202531
Wind speed (km/h)Feels
122breezy
222breezy
322breezy
422breezy
522breezy
622breezy
722breezy
822breezy
922breezy
1022breezy
1122breezy
1222breezy
1322breezy
1422breezy
1522breezy
1622breezy
1722breezy
1822breezy
1922breezy
2022breezy
2122breezy
2222breezy
2323breezy
2423breezy
2523breezy
2623breezy
2723breezy
2823breezy
2923breezy
3023breezy
3123breezy

Sunrise & sunset in August

DaylightNight

Daylight runs from about 10 h 12 min at the start of August to 11 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 60 minutes over August. Sunrise moves from 8:44 AM to 8:09 AM, and sunset from 6:58 PM to 7:21 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.28:446:58
210.38:436:58
310.38:426:59
410.38:417:00
510.38:407:01
610.48:397:01
710.48:387:02
810.48:377:03
910.58:367:04
1010.58:357:05
1110.58:347:05
1210.68:337:06
1310.68:327:07
1410.68:317:08
1510.68:307:08
1610.78:287:09
1710.78:277:10
1810.78:267:11
1910.88:257:12
2010.88:247:12
2110.88:227:13
2210.98:217:14
2310.98:207:15
2410.98:187:15
2511.08:177:16
2611.08:167:17
2711.18:147:18
2811.18:137:18
2911.18:127:19
3011.28:107:20
3111.28:097:21

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 3.22 kWh/m².

For context, solar energy here swings from a low near 2.18 kWh/m² to a high of 7.54 kWh/m² in December across the year — August's 3.22 kWh/m² falls in the middle.

01234151015202531
Solar energy (kWh/m²)Level
12.7Moderate
22.8Moderate
32.8Moderate
42.8Moderate
52.9Moderate
62.9Moderate
72.9Moderate
83.0Moderate
93.0Moderate
103.1Moderate
113.1Moderate
123.1Moderate
133.2Moderate
143.2Moderate
153.2Moderate
163.3Moderate
173.3Moderate
183.3Moderate
193.3Moderate
203.4Moderate
213.4Moderate
223.4Moderate
233.4Moderate
243.5Moderate
253.5Moderate
263.5Moderate
273.5Moderate
283.5Moderate
293.6Moderate
303.6Moderate
313.6Moderate
Planning a trip in August

Is August a good time to visit Montevideo?

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

3.9
Sightseeing
11th-best month of the year
0.0
Beach & pool
11th-best month of the year

August is a weaker month for outdoor sightseeing in Montevideo.

What to pack for Montevideo in August

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

In August, Montevideo sees daytime highs around 13°C and nights near 11°C. Worth packing: a warm layer, rain gear and a windbreaker. About 8 days see rain.

a warm layerrain geara windbreaker

Sea temperature near Montevideo in August

The nearest coast averages about 12°C in August — 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 24°C and coldest in July near 11°C.

It's comfortable for a long swim from Nov 27 to Apr 9 — about 4.4 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan23Refreshing
Feb24Refreshing
Mar22Refreshing
Apr19Cool
May16Cool
Jun13Bracing
Jul11Bracing
Aug12Bracing
Sep13Bracing
Oct16Cool
Nov19Cool
Dec22Refreshing

UV index in Montevideo in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Montevideo 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
Feb11Extreme
Mar10Very high
Apr6High
May3Moderate
Jun2Moderate
Jul3Moderate
Aug4Moderate
Sep6High
Oct8Very high
Nov11Extreme
Dec11Extreme

Air quality in Montevideo in August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August falls, not just the annual average.

Air quality in Montevideo is worst in August — around 16 µg/m³ PM2.5 (moderate), about 1.6× the cleanest month (February, 10 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Montevideo's WHO annual average of 12 µg/m³.

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodAug 1416 µg/m³Feb 2210 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb10Good
Mar10Good
Apr11Good
May12Moderate
Jun13Moderate
Jul15Moderate
Aug16Moderate
Sep14Moderate
Oct12Good
Nov10Good
Dec10Good
Location & terrain

Where is Montevideo?

Montevideo sits at 34.9°S, 56.2°W, 34 m above sea level, in Uruguay. The nearest listed city is Paso de Carrasco, 13 km away.

Canelones

Topography around Montevideo

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

Within 3 km, the terrain around Montevideo has only modest variations in elevation — a maximum elevation change of 56 m around an average of 16 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 130 m; within 80 km, significant variations in elevation — a maximum elevation change of 394 m.

The land around Montevideo is covered by artificial surfaces (55%) and water (38%) within 3 km, water (53%) and artificial surfaces (21%) within 16 km, and water (43%) and grassland (27%) within 80 km.

3 km
56 m
16 km
130 m
80 km
394 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
August weather nearby: Paso de Carrasco 13 km · La Paz 16 km · Las Piedras 19 km · Delta del Tigre 22 km · Barros Blancos 24 km · Progreso 26 km · Pando 29 km · Canelones 43 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 Montevideo (-34.9033°, -56.1882°, elevation 34 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. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).