Santa Helena weather in December

In December, Santa Helena sees average daytime highs of 33°C and overnight lows near 24°C, with 65 mm of rain across 12.5 wet days and about 12.1 hours of daylight. It is the 2nd-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 33°C through the month. The sky is clear or mostly clear about 24% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 12 h 06 min at the start of December to 12 h 06 min by month's end. Set against the rest of the year, December is Santa Helena's 7th-clearest and 4th-windiest month. For the whole year in context, see Santa Helena's year-round climate.

Daytime high
33°
2nd warmest
Overnight low
24°
12th coldest
Rainfall
65 mm
12.5 wet days
Daylight
12 h 06 min
5:54 AM – 6:01 PM
Cloud cover
63%
7th clearest
Wind
11 km/h
4th windiest
Solar energy
5.3 kWh/m²
Travel score
3.4
out of 10

Santa Helena is settlement in Brazil.

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 33°C through the month.

A typical December day in Santa Helena reaches about 33°C in the afternoon and slips back to 24°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 31°C and 34°C. Set against its neighbours, December runs on par with November and about 1°C warmer than January.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13324
23324
33324
43324
53324
63324
73324
83324
93324
103324
113324
123324
133324
143324
153324
163324
173324
183324
193324
203324
213224
223224
233224
243224
253224
263224
273224
283224
293224
303224
313224

How December really feels in Santa Helena

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.

Santa Helena weather by month

How December compares with the rest of the year at a glance. December is the 2nd-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 24°18423.412.12.9
Feb30° / 24°25325.512.12.8
Mar30° / 24°35429.8122.7
Apr30° / 24°33528.7122.7
May30° / 24°23826.411.93.0
Jun30° / 23°11921.311.93.7
Jul30° / 23°8117.911.94.3
Aug31° / 23°3210.511.94.7
Sep32° / 24°175124.7
Oct33° / 24°154124.3
Nov33° / 24°255.312.14.0
Dec33° / 24°6512.512.13.4

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 20% of December, with mostly cloudy or overcast conditions the remaining 56%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15446
25446
35347
45248
55248
65248
75149
85149
95050
105050
114951
124852
134753
144654
154654
164456
174357
184258
194159
204060
214060
223862
233862
243664
253664
263565
273466
283466
293367
303367
313268

Chance of precipitation in December

Any precipitation

Santa Helena gets around 65 mm of rain over 12.5 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 41% and peaks near 60% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
122
223
324
425
526
627
729
830
931
1033
1134
1236
1337
1438
1540
1641
1742
1843
1945
2046
2147
2248
2349
2451
2552
2653
2754
2856
2957
3058
3160

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 97% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
12980
22980
32980
42980
52980
61990
71990
81990
91990
101990
111990
121981
131981
141981
151981
161981
171981
181981
190982
200982
210982
220982
230982
240973
250973
260973
270964
280964
290964
300964
310955

Wind in December

Winds average 11 km/h in December.

Across December, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm
3110calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 12 h 06 min at the start of December to 12 h 06 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 5:47 AM to 6:01 AM, and sunset from 5:55 PM to 6:08 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.15:475:55
212.15:485:55
312.15:485:55
412.15:485:56
512.15:495:56
612.15:495:57
712.15:505:57
812.15:505:58
912.15:505:58
1012.15:515:58
1112.15:515:59
1212.15:525:59
1312.15:526:00
1412.15:536:00
1512.15:536:01
1612.15:546:01
1712.15:546:02
1812.15:546:02
1912.15:556:03
2012.15:556:03
2112.15:566:04
2212.15:566:04
2312.15:576:05
2412.15:576:05
2512.15:586:05
2612.15:586:06
2712.15:596:06
2812.15:596:07
2912.16:006:07
3012.16:006:08
3112.16:016:08

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 5.3 kWh/m².

For context, solar energy here swings from a low near 3.94 kWh/m² to a high of 5.99 kWh/m² in October across the year — December's 5.3 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.6Bright
25.6Bright
35.6Bright
45.6Bright
55.6Bright
65.5Bright
75.5Bright
85.5Bright
95.5Bright
105.5Bright
115.4Bright
125.4Bright
135.4Bright
145.3Bright
155.3Bright
165.3Bright
175.3Bright
185.2Bright
195.2Bright
205.2Bright
215.2Bright
225.1Bright
235.1Bright
245.1Bright
255.1Bright
265.0Bright
275.0Bright
285.0Bright
295.0Bright
305.0Bright
314.9Bright
Planning a trip in December

Hazard calendar for Santa Helena

In seasonPeak

None of Santa Helena's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Santa Helena's monsoon runs January–May, when most of the year's rain falls.

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

Is December a good time to visit Santa Helena?

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

3.4
Sightseeing
7th-best month of the year
5.9
Beach & pool
6th-best month of the year

December is a weaker month for outdoor sightseeing in Santa Helena.

What to pack for Santa Helena in December

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

In December, Santa Helena sees daytime highs around 33°C and nights near 24°C. Pack light clothes. Worth having: rain gear and sun protection. About 13 days see rain.

light clothesrain gearsun protection

UV index in Santa Helena 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 Santa Helena peaks around March 17 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 15 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 17UV 15Jul 15UV 10
UV index (midday)Level
Jan13Extreme
Feb14Extreme
Mar15Extreme
Apr14Extreme
May12Extreme
Jun10Extreme
Jul10Very high
Aug10Extreme
Sep12Extreme
Oct12Extreme
Nov11Extreme
Dec11Extreme

Air quality in Santa Helena 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 Santa Helena is worst in February — around 18 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (July, 7 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateFeb 2018 µg/m³Jul 137 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb18Moderate
Mar17Moderate
Apr13Moderate
May9Good
Jun8Good
Jul7Good
Aug8Good
Sep9Good
Oct10Good
Nov11Good
Dec13Moderate
Location & terrain

Where is Santa Helena?

Santa Helena sits at 2.2°S, 45.3°W, 12 m above sea level, in Brazil. The nearest listed city is Turilândia, 1.0 km away.

Topography around Santa Helena

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

Within 3 km, the terrain around Santa Helena has only modest variations in elevation — a maximum elevation change of 27 m around an average of 8 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 72 m; within 80 km, only modest variations in elevation — a maximum elevation change of 170 m.

The land around Santa Helena is covered by grassland (56%) within 3 km, grassland (46%) and trees (42%) within 16 km, and trees (57%) and grassland (32%) within 80 km.

3 km
27 m
16 km
72 m
80 km
170 m
treesgrasslandartificial surfaceswaterwetlandmangroves
December weather nearby: Turilândia 1.0 km · Pinheiro 40 km · Presidente Sarney 41 km · Bacuri 59 km · Bequimão 62 km · Santa Luzia do Paruá 63 km · Turiaçu 64 km · Palmeirândia 64 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 Santa Helena (-2.2311°, -45.3°, elevation 12 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).