Nova Mamoré weather in December

In December, Nova Mamoré sees average daytime highs of 31°C and overnight lows near 23°C, with 244 mm of rain across 26.1 wet days and about 12.6 hours of daylight. It is the 6th-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 2% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 12 h 36 min at the start of December to 12 h 36 min by month's end. Set against the rest of the year, December is Nova Mamoré's 9th-clearest and 4th-windiest month. For the whole year in context, see Nova Mamoré's year-round climate.

Daytime high
31°
6th warmest
Overnight low
23°
12th coldest
Rainfall
244 mm
26.1 wet days
Daylight
12 h 36 min
5:59 AM – 6:36 PM
Cloud cover
86%
9th clearest
Wind
6 km/h
4th windiest
Solar energy
4.88 kWh/m²
Travel score
2.8
out of 10

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 Nova Mamoré 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 28°C and 33°C. Set against its neighbours, December runs about 1°C cooler than 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
283023
293023
303023
313023

How December really feels in Nova Mamoré

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.

Nova Mamoré weather by month

How December compares with the rest of the year at a glance. December is the 6th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 23°25327.312.52.8
Feb30° / 23°24224.912.32.8
Mar30° / 23°24726.912.12.8
Apr30° / 23°16522.711.83.2
May30° / 22°7515.411.54.2
Jun31° / 21°265.711.45.3
Jul32° / 20°15311.55.3
Aug33° / 21°32511.74.0
Sep33° / 22°7011.611.93.2
Oct33° / 23°12518.612.22.8
Nov32° / 23°18622.612.52.8
Dec31° / 23°24426.112.62.8

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 2% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 7% of December, with mostly cloudy or overcast conditions the remaining 91%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11090
21090
31090
41090
51090
61090
71090
81090
91090
101090
111090
121090
131090
141090
151090
161090
17991
18991
19991
20991
21991
22892
23892
24892
25793
26793
27793
28793
29793
30793
31694

Chance of precipitation in December

Any precipitation

Nova Mamoré gets around 244 mm of rain over 26.1 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 84% and peaks near 86% on the wettest days.

0%20%40%60%80%100%151015202531
Rain chance (%)
181
281
381
481
582
682
782
882
983
1083
1183
1283
1384
1484
1584
1685
1785
1885
1986
2086
2186
2286
2386
2486
2586
2686
2786
2886
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 68% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
106634
206634
306634
406634
506634
606634
706634
806634
906634
1016534
1116534
1216633
1316633
1416633
1516732
1616732
1716732
1816831
1916831
2016930
2117029
2217029
2317128
2417128
2517128
2617128
2717227
2807327
2907327
3007327
3107327

Wind in December

Winds average 6 km/h in December.

Across December, daily wind ranges from about 6 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 12 h 36 min at the start of December to 12 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 0 minutes over December. Sunrise moves from 5:54 AM to 6:06 AM, and sunset from 6:28 PM to 6:42 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.65:546:28
212.65:546:29
312.65:556:29
412.65:556:30
512.65:556:30
612.65:566:31
712.65:566:31
812.65:566:32
912.65:576:32
1012.65:576:33
1112.65:576:33
1212.65:586:34
1312.65:586:34
1412.65:586:35
1512.65:596:35
1612.65:596:36
1712.66:006:36
1812.66:006:37
1912.66:016:37
2012.66:016:38
2112.66:026:38
2212.66:026:39
2312.66:026:39
2412.66:036:39
2512.66:036:40
2612.66:046:40
2712.66:046:41
2812.66:056:41
2912.66:056:42
3012.66:066:42
3112.66:066:42

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.88 kWh/m².

For context, solar energy here swings from a low near 4.28 kWh/m² to a high of 5.6 kWh/m² in September across the year — December's 4.88 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
44.9Bright
54.9Bright
64.9Bright
74.9Bright
84.9Bright
94.9Bright
104.9Bright
114.9Bright
124.9Bright
134.9Bright
144.9Bright
154.9Bright
164.9Bright
174.9Bright
184.9Bright
194.9Bright
204.9Bright
214.9Bright
224.8Bright
234.8Bright
244.8Bright
254.8Bright
264.8Bright
274.8Bright
284.8Bright
294.8Bright
304.8Bright
314.8Bright
Planning a trip in December

Hazard calendar for Nova Mamoré

In seasonPeak

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

Nova Mamoré's rainy season runs October–April, 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 Nova Mamoré?

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

2.8
Sightseeing
7th-best month of the year
4.0
Beach & pool
9th-best month of the year

December is a weaker month for outdoor sightseeing in Nova Mamoré.

What to pack for Nova Mamoré in December

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

In December, Nova Mamoré sees daytime highs around 31°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 26 days see rain.

light clothesrain gearsun protection

UV index in Nova Mamoré in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 14 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Nova Mamoré peaks around January 19 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near September 12 at about 4 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateExtremeJan 19UV 15Sep 12UV 4
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar15Extreme
Apr13Extreme
May10Extreme
Jun9Very high
Jul9Very high
Aug6High
Sep3Moderate
Oct12Extreme
Nov13Extreme
Dec14Extreme

Air quality in Nova Mamoré 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 Nova Mamoré is worst in September — around 78 µg/m³ PM2.5 (unhealthy), about 9.3× the cleanest month (May, 8 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateUnhealthyModerateSep 1275 µg/m³May 218 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb13Moderate
Mar13Moderate
Apr10Good
May8Good
Jun9Good
Jul16Moderate
Aug63Unhealthy
Sep78Unhealthy
Oct29Moderate
Nov17Moderate
Dec12Moderate
Location & terrain

Where is Nova Mamoré?

Nova Mamoré sits at 10.4°S, 65.3°W, 133 m above sea level, in Brazil. The nearest listed city is Guajará Mirim, 42 km away.

Candeias do Jamari

Topography around Nova Mamoré

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

Within 3 km, the terrain around Nova Mamoré has only modest variations in elevation — a maximum elevation change of 58 m around an average of 136 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 135 m; within 80 km, significant variations in elevation — a maximum elevation change of 372 m.

The land around Nova Mamoré is covered by grassland (54%) and trees (35%) within 3 km, trees (55%) and grassland (39%) within 16 km, and trees (78%) and grassland (20%) within 80 km.

3 km
58 m
16 km
135 m
80 km
372 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Guajará Mirim 42 km · Guayaramerín 47 km · Riberalta 104 km · Buritis 165 km · Plácido de Castro 203 km · Alto Paraíso 233 km · Porto Velho 240 km · Candeias do Jamari 252 km

Brazil travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / N
127 / 220 V · 60 Hz
Prices
≈ 46% of US
price level, 2025
GDP per capita
$10,713
2025
Happiness
6.6 / 10
World Happiness, 2025
Safe drinking water
89%
of population, 2024
Homicide rate
19.3
per 100k, 2023
Road deaths
16
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 482
Religion
Roman Catholic 57%Evangelical 27%none 9%other 4%

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 Nova Mamoré (-10.4019°, -65.3267°, elevation 133 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).