San Borja weather in December

In December, San Borja sees average daytime highs of 31°C and overnight lows near 23°C, with 294 mm of rain across 24.6 wet days and about 12.9 hours of daylight. It is the 5th-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 4% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 12 h 48 min at the start of December to 12 h 54 min by month's end. Set against the rest of the year, December is San Borja's 10th-clearest and 1st-windiest month. For the whole year in context, see San Borja's year-round climate.

Daytime high
31°
5th warmest
Overnight low
23°
12th coldest
Rainfall
294 mm
24.6 wet days
Daylight
12 h 54 min
5:57 AM – 6:49 PM
Cloud cover
85%
10th clearest
Wind
8 km/h
1st windiest
Solar energy
5.02 kWh/m²
Travel score
2.8
out of 10

San Borja is Municipio en Bolivia.

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 31°C through the month.

A typical December day in San Borja reaches about 31°C in the afternoon and slips back to 23°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 34°C. Set against its neighbours, December runs on par with November and on par with January.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13123
23123
33123
43123
53123
63123
73123
83123
93123
103123
113123
123123
133123
143123
153123
163123
173123
183123
193123
203123
213123
223123
233123
243123
253123
263123
273123
283123
293123
303123
313123

How December really feels in San Borja

Once humidity and wind are folded in, December averages 31 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in December is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

San Borja weather by month

How December compares with the rest of the year at a glance. December is the 5th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 23°34827.112.82.7
Feb31° / 23°30323.312.52.9
Mar31° / 23°2652412.13.0
Apr30° / 22°15416.711.73.9
May29° / 20°8611.311.35.5
Jun28° / 19°577.611.16.5
Jul28° / 18°496.211.26.5
Aug31° / 19°60711.54.9
Sep33° / 21°11810.811.93.6
Oct33° / 23°17817.612.33.0
Nov32° / 23°21219.412.73.0
Dec31° / 23°29424.612.92.8

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 4% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 8% of December, with mostly cloudy or overcast conditions the remaining 88%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11486
21387
31387
41189
51189
61189
71189
81189
91288
101288
111288
121189
131189
141189
151189
161288
171288
181288
191288
201288
211288
221288
231288
241288
251189
261189
271090
281090
291090
301189
311189

Chance of precipitation in December

Any precipitation

San Borja gets around 294 mm of rain over 24.6 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 79% and peaks near 86% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%100%151015202531
Rain chance (%)
175
275
375
476
576
676
776
876
976
1076
1176
1277
1377
1477
1578
1678
1779
1879
1980
2080
2181
2282
2382
2483
2584
2684
2785
2885
2986
3086
3186

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the oppressive band about 58% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1046036
2046036
3046135
4046135
5046135
6046234
7146134
8146233
9146233
10146233
11146233
12136234
13136234
14136135
15136036
16135937
17135838
18135838
19135739
20135640
21125641
22125641
23025642
24025642
25025543
26025543
27015643
28015544
29015544
30015445
31015445

Wind in December

Winds average 8 km/h in December, the windiest month of the year.

Across December, daily wind ranges from about 8 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 12 h 48 min at the start of December to 12 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 6 minutes over December. Sunrise moves from 5:52 AM to 6:04 AM, and sunset from 6:41 PM to 6:56 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:526:41
212.85:526:42
312.85:536:42
412.85:536:43
512.85:536:43
612.85:536:44
712.85:546:45
812.95:546:45
912.95:546:46
1012.95:556:46
1112.95:556:47
1212.95:556:47
1312.95:566:48
1412.95:566:48
1512.95:576:49
1612.95:576:49
1712.95:576:50
1812.95:586:50
1912.95:586:51
2012.95:596:51
2112.95:596:52
2212.96:006:52
2312.96:006:53
2412.96:016:53
2512.96:016:54
2612.96:026:54
2712.96:026:55
2812.96:036:55
2912.96:036:55
3012.96:046:56
3112.96:046:56

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.02 kWh/m².

For context, solar energy here swings from a low near 3.68 kWh/m² to a high of 5.46 kWh/m² in October across the year — December's 5.02 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.1Bright
45.1Bright
55.0Bright
65.0Bright
75.0Bright
85.0Bright
95.0Bright
105.0Bright
115.0Bright
125.0Bright
135.0Bright
145.0Bright
155.0Bright
165.0Bright
175.0Bright
185.0Bright
195.0Bright
205.0Bright
215.0Bright
225.0Bright
235.0Bright
245.0Bright
255.0Bright
265.0Bright
275.0Bright
285.0Bright
295.0Bright
304.9Bright
314.9Bright
Planning a trip in December

Hazard calendar for San Borja

In seasonPeak

In December, San Borja sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

San Borja's rainy season runs October–March, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is December a good time to visit San Borja?

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

2.8
Sightseeing
11th-best month of the year
4.2
Beach & pool
10th-best month of the year

December is a weaker month for outdoor sightseeing in San Borja.

What to pack for San Borja in December

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

In December, San Borja sees daytime highs around 31°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 25 days see rain.

light clothesrain gearsun protection

UV index in San Borja in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 13 (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 Borja peaks around January 21 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near September 11 at about 8 (very high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeJan 21UV 15Sep 11UV 8
UV index (midday)Level
Jan16Extreme
Feb15Extreme
Mar14Extreme
Apr11Extreme
May9Very high
Jun8Very high
Jul8Very high
Aug8Very high
Sep8Very high
Oct12Extreme
Nov14Extreme
Dec13Extreme

Air quality in San Borja in December

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in San Borja is worst in September — around 50 µg/m³ PM2.5 (poor), about 6.4× the cleanest month (May, 8 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0204060JanFebMarAprMayJunJulAugSepOctNovDecGoodModeratePoorModerateSep 2350 µg/m³May 218 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb12Good
Mar11Good
Apr9Good
May8Good
Jun8Good
Jul11Good
Aug22Moderate
Sep50Poor
Oct50Poor
Nov27Moderate
Dec11Good
Location & terrain

Where is San Borja?

San Borja sits at 14.9°S, 66.7°W, 195 m above sea level, in Bolivia. The nearest listed city is Caranavi, 140 km away.

CaranaviTrinidadSorataLa PazQuimeAchocallaLajaViacha

Topography around San Borja

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

Within 3 km, the terrain around San Borja has only modest variations in elevation — a maximum elevation change of 21 m around an average of 194 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 44 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,527 m.

The land around San Borja is covered by grassland (61%) and trees (28%) within 3 km, grassland (63%) and trees (30%) within 16 km, and trees (75%) and grassland (23%) within 80 km.

3 km
21 m
16 km
44 m
80 km
1,527 m
treesshrubsgrasslandartificial surfaceswaterwetland
December weather nearby: Caranavi 140 km · Trinidad 198 km · Sorata 228 km · La Paz 237 km · Quime 242 km · Achocalla 243 km · Laja 256 km · Viacha 260 km

Bolivia travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / B / C
230 V · 50 Hz
Prices
≈ 40% of US
price level, 2025
GDP per capita
$5,148
2025
Happiness
5.8 / 10
World Happiness, 2025
Homicide rate
4.4
per 100k, 2023
Road deaths
21.1
per 100k/yr, 2019
Income group
Lower middle
World Bank
English
Moderate
EF EPI 521
Religion
Roman Catholic 65%Protestant 20%none 6%other 5%

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 Borja (-14.852°, -66.7495°, elevation 195 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. 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).