Santa Rosa weather in January

In January, Santa Rosa sees average daytime highs of 31°C and overnight lows near 21°C, with 143 mm of rain across 14.5 wet days and about 13.6 hours of daylight. It is the 1st-warmest and 7th-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 40% of the time in January, and the air most often feels oppressive.

Daylight stretches from about 13 h 42 min at the start of January to 13 h 18 min by month's end. Set against the rest of the year, January is Santa Rosa's 9th-clearest and 9th-windiest month. For the whole year in context, see Santa Rosa's year-round climate.

Daytime high
31°
1st warmest
Overnight low
21°
12th coldest
Rainfall
143 mm
14.5 wet days
Daylight
13 h 36 min
7:00 AM – 8:35 PM
Cloud cover
55%
9th clearest
Wind
10 km/h
9th windiest
Solar energy
6.52 kWh/m²
Travel score
3.9
out of 10

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

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

A typical January day in Santa Rosa reaches about 31°C in the afternoon and slips back to 21°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 35°C. Set against its neighbours, January runs on par with December and on par with February.

15°20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13221
23221
33221
43221
53221
63221
73221
83221
93221
103221
113221
123221
133121
143121
153121
163121
173121
183121
193121
203121
213121
223121
233121
243121
253121
263121
273121
283121
293121
303121
313121

How January really feels in Santa Rosa

Once humidity and wind are folded in, January 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 January is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Santa Rosa weather by month

How January compares with the rest of the year at a glance. January is the 1st-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 21°14314.513.63.9
Feb31° / 21°13614134.2
Mar30° / 19°12711.812.25.0
Apr27° / 17°1559.711.46.6
May23° / 13°1529.410.66.9
Jun21° / 12°1439.710.36.5
Jul20° / 11°1379.410.46.6
Aug23° / 12°948.5117.3
Sep25° / 14°15210.411.87.0
Oct27° / 16°21512.912.76.1
Nov29° / 18°1561113.45.5
Dec31° / 20°16013.113.74.3

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 40% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 15% of January, with mostly cloudy or overcast conditions the remaining 44%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15545
25545
35545
45545
55446
65446
75446
85545
95644
105644
115644
125644
135644
145644
155644
165644
175644
185644
195644
205644
215644
225644
235644
245644
255644
265644
275644
285644
295644
305644
315743

Chance of precipitation in January

Any precipitation

Santa Rosa gets around 143 mm of rain over 14.5 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 47% and peaks near 49% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
146
246
346
446
546
647
747
847
947
1047
1147
1247
1347
1447
1547
1647
1747
1847
1947
2047
2147
2247
2347
2447
2547
2648
2748
2848
2949
3049
3149

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, January lands in the oppressive band about 40% of days. Sticky, muggy-or-worse air turns up on roughly 76% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1381930381
2381930391
3281929401
4281929401
5281830411
6281829411
7291830411
8291730411
9281731411
10281632411
11281633411
12281534411
13271535401
14271536400
15261437400
16261438390
17261439390
18251440390
19251440380
20251540380
21251540380
22251540380
23151640380
24141640390
25141640390
26141640390
27141740390
28141739390
29141739390
30141639400
31141639400

Wind in January

Winds average 10 km/h in January.

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

051015151015202531
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm
3110calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 13 h 42 min at the start of January to 13 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 24 minutes over January. Sunrise moves from 6:49 AM to 7:11 AM, and sunset from 8:33 PM to 8:31 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.76:498:33
213.76:508:33
313.76:508:34
413.76:518:34
513.76:528:34
613.76:528:34
713.76:538:34
813.76:548:35
913.76:548:35
1013.76:558:35
1113.76:568:35
1213.66:578:35
1313.66:578:35
1413.66:588:35
1513.66:598:35
1613.67:008:35
1713.67:008:35
1813.67:018:35
1913.57:028:34
2013.57:038:34
2113.57:048:34
2213.57:048:34
2313.57:058:34
2413.57:068:33
2513.47:078:33
2613.47:078:33
2713.47:088:33
2813.47:098:32
2913.47:108:32
3013.37:118:31
3113.37:118:31

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 6.52 kWh/m².

For context, solar energy here swings from a low near 2.61 kWh/m² to a high of 6.63 kWh/m² in December across the year — January's 6.52 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.7Intense
26.7Intense
36.7Intense
46.7Intense
56.7Intense
66.7Intense
76.6Intense
86.6Intense
96.6Intense
106.6Intense
116.6Intense
126.6Intense
136.6Intense
146.6Intense
156.5Intense
166.5Intense
176.5Intense
186.5Intense
196.5Intense
206.5Intense
216.4Intense
226.4Intense
236.4Intense
246.4Intense
256.3Intense
266.3Intense
276.3Intense
286.3Intense
296.3Intense
306.2Intense
316.2Intense
Planning a trip in January

Is January a good time to visit Santa Rosa?

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

3.9
Sightseeing
12th-best month of the year
6.0
Beach & pool
8th-best month of the year

January is a weaker month for outdoor sightseeing in Santa Rosa.

What to pack for Santa Rosa in January

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

In January, Santa Rosa sees daytime highs around 31°C and nights near 21°C. Pack light clothes, rain gear and sun protection. About 15 days see rain.

light clothesrain gearsun protection

UV index in Santa Rosa in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January 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 Santa Rosa peaks around January 20 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 21 at about 4 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateVery highExtremeJan 20UV 14Jun 21UV 4
UV index (midday)Level
Jan14Extreme
Feb13Extreme
Mar11Extreme
Apr8Very high
May5High
Jun4Moderate
Jul4Moderate
Aug5High
Sep8Very high
Oct7Very high
Nov11Extreme
Dec12Extreme

Air quality in Santa Rosa in January

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Santa Rosa is worst in September — around 17 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (March, 7 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1516 µg/m³Mar 137 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb7Good
Mar7Good
Apr8Good
May7Good
Jun7Good
Jul8Good
Aug13Moderate
Sep17Moderate
Oct11Good
Nov8Good
Dec7Good
Location & terrain

Where is Santa Rosa?

Santa Rosa sits at 27.9°S, 54.5°W, 284 m above sea level, in Brazil. The nearest listed city is Santo Cristo, 19 km away.

Topography around Santa Rosa

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

Within 3 km, the terrain around Santa Rosa has only modest variations in elevation — a maximum elevation change of 137 m around an average of 273 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 268 m; within 80 km, significant variations in elevation — a maximum elevation change of 487 m.

The land around Santa Rosa is covered by trees (37%) and artificial surfaces (32%) within 3 km, cropland (61%) and trees (29%) within 16 km, and cropland (47%) and trees (39%) within 80 km.

3 km
137 m
16 km
268 m
80 km
487 m
treesgrasslandcroplandartificial surfacesbare terrainwater
January weather nearby: Santo Cristo 19 km · Giruá 22 km · Três de Maio 26 km · Horizontina 32 km · Santo Ângelo 52 km · El Soberbio 70 km · Três Passos 71 km · Oberá 76 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 Rosa (-27.8708°, -54.4814°, elevation 284 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).