Rio Claro weather in January

In January, Rio Claro sees average daytime highs of 29°C and overnight lows near 21°C, with 295 mm of rain across 24 wet days and about 13.2 hours of daylight. It is the 2nd-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 14% of the time in January, and the air most often feels muggy.

Daylight stretches from about 13 h 24 min at the start of January to 13 hours by month's end. Set against the rest of the year, January is Rio Claro's 10th-clearest and 7th-windiest month. For the whole year in context, see Rio Claro's year-round climate.

Daytime high
29°
2nd warmest
Overnight low
21°
12th coldest
Rainfall
295 mm
24 wet days
Daylight
13 h 18 min
6:28 AM – 7:43 PM
Cloud cover
76%
10th clearest
Wind
5 km/h
7th windiest
Solar energy
5.51 kWh/m²
Travel score
3.8
out of 10

Rio Claro is Place in Brasil.

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

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 29°C through the month.

A typical January day in Rio Claro reaches about 29°C in the afternoon and slips back to 21°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 32°C. Set against its neighbours, January runs about 1°C warmer than December and on par with February.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12821
22821
32821
42821
52821
62821
72821
82821
92821
102821
112821
122821
132821
142821
152921
162921
172921
182921
192921
202921
212921
222921
232921
242921
252921
262921
272921
282921
292921
302921
312921

Rio Claro weather by month

How January compares with the rest of the year at a glance. January is the 2nd-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 21°2952413.23.8
Feb29° / 21°2042012.83.9
Mar28° / 20°20122.812.24.4
Apr26° / 19°10214.111.55.9
May24° / 16°6310.710.96.8
Jun24° / 15°356.710.67.6
Jul23° / 14°40710.77.6
Aug24° / 15°367.311.27.6
Sep25° / 16°7812.111.96.4
Oct26° / 18°11516.112.55.5
Nov26° / 19°18820.413.14.8
Dec28° / 20°23723.113.44.3

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 14% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 12% of January, with mostly cloudy or overcast conditions the remaining 73%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12476
22476
32476
42476
52476
62476
72377
82575
92575
102575
112575
122674
132674
142674
152674
162674
172773
182773
192773
202773
212773
222773
232872
242872
252872
262971
272971
282971
293070
303070
313268

Chance of precipitation in January

Any precipitation

Rio Claro gets around 295 mm of rain over 24 wet days in January, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 77% and peaks near 80% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
180
280
379
479
579
678
778
878
977
1077
1177
1277
1377
1477
1577
1678
1778
1878
1978
2078
2178
2278
2378
2477
2576
2676
2775
2874
2973
3073
3172

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, January lands in the muggy band about 58% of days. Sticky, muggy-or-worse air turns up on roughly 93% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)
176528
276429
376429
476330
576330
676330
776231
876231
976132
1076132
1176132
1276033
1375934
1475934
1575835
1675835
1775736
1875736
1975736
2075637
2185537
2285438
2385438
2485438
2585438
2685438
2785438
2885438
2985438
3085537
3185537

Wind in January

Winds average 5 km/h in January.

Across January, daily wind ranges from about 5 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 13 h 24 min at the start of January to 13 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 24 minutes over January. Sunrise moves from 6:19 AM to 6:38 AM, and sunset from 7:41 PM to 7:41 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.46:197:41
213.46:197:41
313.46:207:41
413.46:207:42
513.36:217:42
613.36:227:42
713.36:227:42
813.36:237:43
913.36:247:43
1013.36:247:43
1113.36:257:43
1213.36:267:43
1313.36:267:43
1413.36:277:43
1513.36:287:43
1613.36:287:43
1713.26:297:43
1813.26:307:43
1913.26:307:43
2013.26:317:43
2113.26:327:43
2213.26:327:43
2313.26:337:43
2413.26:347:43
2513.16:347:43
2613.16:357:43
2713.16:367:42
2813.16:367:42
2913.16:377:42
3013.16:387:42
3113.06:387:41

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 5.51 kWh/m².

For context, solar energy here swings from a low near 3.4 kWh/m² to a high of 5.71 kWh/m² in February across the year — January's 5.51 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.5Bright
55.5Bright
65.5Bright
75.5Bright
85.5Bright
95.5Bright
105.5Bright
115.5Bright
125.5Bright
135.6Bright
145.6Bright
155.6Bright
165.6Bright
175.6Bright
185.6Bright
195.6Bright
205.6Bright
215.6Bright
225.6Bright
235.6Bright
245.6Bright
255.6Bright
265.7Bright
275.7Bright
285.7Bright
295.7Bright
305.7Bright
315.7Bright
Planning a trip in January

Hazard calendar for Rio Claro

In seasonPeak

In January, Rio Claro sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Rio Claro's rainy season runs November–March, when most of the year's rain falls.

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

Is January a good time to visit Rio Claro?

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

3.8
Sightseeing
12th-best month of the year
4.6
Beach & pool
11th-best month of the year

January is a weaker month for outdoor sightseeing in Rio Claro.

What to pack for Rio Claro in January

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

In January, Rio Claro sees daytime highs around 29°C and nights near 21°C. Pack light clothes and rain gear. Worth having: sun protection. About 24 days see rain.

light clothesrain gearsun protection

Sea temperature near Rio Claro in January

The nearest coast averages about 27°C in January — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 51 km away) is warmest in February at about 27°C and coldest in August near 21°C.

The water stays above 20°C all year — warm enough for a swim any month.

20°22°24°26°28°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan27Warm
Feb27Warm
Mar27Warm
Apr26Warm
May24Warm
Jun23Refreshing
Jul22Refreshing
Aug21Refreshing
Sep22Refreshing
Oct23Refreshing
Nov23Refreshing
Dec25Warm

UV index in Rio Claro 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 Rio Claro peaks around February 9 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 12 at about 5 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighVery highExtremeFeb 9UV 14Jul 12UV 5
UV index (midday)Level
Jan14Extreme
Feb14Extreme
Mar12Extreme
Apr9Very high
May7High
Jun6High
Jul5High
Aug8Very high
Sep7High
Oct11Extreme
Nov13Extreme
Dec14Extreme

Air quality in Rio Claro 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 Rio Claro is worst in September — around 33 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (December, 15 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateSep 1332 µg/m³Dec 2115 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb16Moderate
Mar17Moderate
Apr19Moderate
May24Moderate
Jun29Moderate
Jul31Moderate
Aug27Moderate
Sep33Moderate
Oct20Moderate
Nov17Moderate
Dec15Moderate
Location & terrain

Where is Rio Claro?

Rio Claro sits at 22.7°S, 44.1°W, 464 m above sea level, in Brazil. The nearest listed city is Barra Mansa, 20 km away.

Topography around Rio Claro

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

Within 3 km, the terrain around Rio Claro has large variations in elevation — a maximum elevation change of 814 m around an average of 583 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,265 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,761 m.

The land around Rio Claro is covered by trees (50%) and grassland (48%) within 3 km, grassland (56%) and trees (43%) within 16 km, and trees (43%), grassland (29%) and water (24%) within 80 km.

3 km
814 m
16 km
1,265 m
80 km
2,761 m
treesgrasslandartificial surfaceswater
January weather nearby: Barra Mansa 20 km · Volta Redonda 22 km · Piraí 27 km · Pinheiral 27 km · Mangaratiba 28 km · Angra dos Reis 37 km · Porto Real 37 km · Itaguaí 40 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 Rio Claro (-22.7231°, -44.1356°, elevation 464 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. 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).