San José de Mayo weather in December

In December, San José de Mayo sees average daytime highs of 28°C and overnight lows near 16°C, with 88 mm of rain across 8.3 wet days and about 14.3 hours of daylight. It is the 3rd-warmest and 7th-wettest month of the year here.

Highs climb over the month, from about 26°C in the first days to 29°C by the end. The sky is clear or mostly clear about 47% of the time in December, and the air most often feels dry.

Daylight stretches from about 14 h 06 min at the start of December to 14 h 18 min by month's end. Set against the rest of the year, December is San José de Mayo's 2nd-clearest and 7th-windiest month. For the whole year in context, see San José de Mayo's year-round climate.

Daytime high
28°
3rd warmest
Overnight low
16°
10th coldest
Rainfall
88 mm
8.3 wet days
Daylight
14 h 18 min
6:35 AM – 8:52 PM
Cloud cover
46%
2nd clearest
Wind
13 km/h
7th windiest
Solar energy
7.42 kWh/m²
Travel score
6.6
out of 10

San José de Mayo is city in Uruguay, departmental capital of San José.

Density
2,117/km²
people per km²
Founded
1783

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 26°C in the first days to 29°C by the end.

A typical December day in San José de Mayo reaches about 28°C in the afternoon and slips back to 16°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 32°C. Set against its neighbours, December runs about 3°C warmer than November and about 2°C cooler than January.

10°15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12615
22615
32615
42715
52715
62715
72715
82715
92716
102716
112716
122716
132716
142816
152816
162816
172816
182816
192817
202817
212817
222817
232817
242817
252917
262917
272917
282917
292918
302918
312918

San José de Mayo weather by month

How December compares with the rest of the year at a glance. December is the 3rd-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 18°857.9145.9
Feb28° / 18°1028.213.36.4
Mar26° / 16°1038.112.37.1
Apr22° / 13°101811.27.1
May19° / 10°836.710.26.4
Jun16° / 797.59.85.2
Jul15° / 787.49.94.8
Aug17° / 917.710.75.8
Sep19° / 857.611.86.4
Oct22° / 11°1169.812.96.7
Nov25° / 14°1057.813.87.3
Dec28° / 16°888.314.36.6

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 47% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 14% of December, with mostly cloudy or overcast conditions the remaining 39%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15842
25842
35941
45941
56040
66040
76139
86139
96139
106238
116238
126238
136337
146337
156337
166238
176337
186337
196238
206238
216238
226238
236139
246139
256139
266040
275941
285941
295941
305941
315941

Chance of precipitation in December

Any precipitation

San José de Mayo gets around 88 mm of rain over 8.3 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 27% and peaks near 29% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
126
226
326
426
526
626
726
826
926
1026
1126
1227
1327
1427
1528
1628
1728
1829
1929
2029
2128
2228
2328
2428
2528
2627
2727
2827
2926
3026
3126

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the dry band about 32% of days. Sticky, muggy-or-worse air turns up on roughly 16% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
144252470
244252470
344242480
444242480
543242480
643252481
742252581
841252581
940262591
1039262591
1138272691
1237272691
13352826101
14342827111
15332827111
16312828121
17302828131
18292828141
19282729151
20262729161
21252729171
22242629182
23232629192
24222529203
25222529213
26212429223
27212429234
28202429234
29202329244
30192329245
31192329255

Wind in December

Winds average 13 km/h in December.

Across December, daily wind ranges from about 13 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze
3113light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 14 h 06 min at the start of December to 14 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 12 minutes over December. Sunrise moves from 6:33 AM to 6:42 AM, and sunset from 8:40 PM to 8:58 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.16:338:40
214.16:338:41
314.26:338:42
414.26:338:43
514.26:338:44
614.26:338:45
714.26:338:45
814.26:338:46
914.26:338:47
1014.26:338:48
1114.26:338:48
1214.36:338:49
1314.36:348:50
1414.36:348:50
1514.36:348:51
1614.36:358:52
1714.36:358:52
1814.36:358:53
1914.36:368:53
2014.36:368:54
2114.36:368:54
2214.36:378:55
2314.36:378:55
2414.36:388:56
2514.36:388:56
2614.36:398:56
2714.36:408:57
2814.36:408:57
2914.36:418:57
3014.36:418:58
3114.36:428:58

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 7.42 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 2.23 kWh/m² to a high of 7.42 kWh/m² in December across the year — December's 7.42 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
17.3Intense
27.3Intense
37.3Intense
47.4Intense
57.4Intense
67.4Intense
77.4Intense
87.4Intense
97.5Intense
107.5Intense
117.5Intense
127.5Intense
137.5Intense
147.4Intense
157.4Intense
167.4Intense
177.4Intense
187.4Intense
197.4Intense
207.4Intense
217.4Intense
227.4Intense
237.4Intense
247.4Intense
257.4Intense
267.3Intense
277.3Intense
287.3Intense
297.3Intense
307.3Intense
317.3Intense
Planning a trip in December

Is December a good time to visit San José de Mayo?

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

6.6
Sightseeing
5th-best month of the year
7.2
Beach & pool
2nd-best month of the year

December is a reasonable time to visit San José de Mayo for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for San José de Mayo in December

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

In December, San José de Mayo sees daytime highs around 28°C and nights near 16°C. Pack light clothes and sun protection. Worth having: rain gear. About 8 days see rain.

light clothessun protectionrain gear

Sea temperature near San José de Mayo in December

The nearest coast averages about 23°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 35 km away) is warmest in January at about 24°C and coldest in July near 11°C.

It's comfortable for a long swim from Nov 17 to Apr 9 — about 4.7 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan24Warm
Feb24Warm
Mar23Refreshing
Apr19Cool
May16Cool
Jun13Bracing
Jul11Bracing
Aug12Bracing
Sep14Bracing
Oct17Cool
Nov20Refreshing
Dec23Refreshing

UV index in San José de Mayo in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in San José de Mayo peaks around January 16 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 18 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 16UV 13Jun 18UV 3
UV index (midday)Level
Jan13Extreme
Feb11Extreme
Mar10Very high
Apr6High
May4Moderate
Jun3Moderate
Jul3Moderate
Aug4Moderate
Sep6High
Oct8Very high
Nov11Extreme
Dec11Extreme
Location & terrain

Where is San José de Mayo?

San José de Mayo sits at 34.3°S, 56.7°W, 53 m above sea level, in Uruguay. The nearest listed city is Santa Lucía, 32 km away.

Santa LucíaCanelonesFloridaDelta del TigreProgresoLas PiedrasLa PazMontevideo

Topography around San José de Mayo

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

Within 3 km, the terrain around San José de Mayo has only modest variations in elevation — a maximum elevation change of 50 m around an average of 37 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 85 m; within 80 km, only modest variations in elevation — a maximum elevation change of 202 m.

The land around San José de Mayo is covered by grassland (40%), artificial surfaces (23%) and trees (21%) within 3 km, cropland (51%) and grassland (37%) within 16 km, and grassland (39%), cropland (33%) and water (21%) within 80 km.

3 km
50 m
16 km
85 m
80 km
202 m
treesgrasslandcroplandartificial surfaceswaterwetland
December weather nearby: Santa Lucía 32 km · Canelones 45 km · Florida 53 km · Delta del Tigre 57 km · Progreso 58 km · Las Piedras 63 km · La Paz 65 km · Montevideo 79 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 José de Mayo (-34.339°, -56.7134°, elevation 53 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).