Climate and average weather in São Jerônimo

In São Jerônimo, the summers are humid, hot, showery, and partly cloudy and the winters are mild and partly cloudy.

Best: mid March to early December

Over the course of the year, the temperature in São Jerônimo typically varies from 10°C to 30°C, and is rarely below 4°C or above 35°C. January is the hottest month of the year, while July is the coldest.

Based on the travel score, the best time of year to visit São Jerônimo for warm-weather activities is from mid March to early December.

Hottest
Jan
30°
Coldest
Jul
10°
Wettest
Oct
170 mm
Driest
Mar
105 mm
Rain / yr
1510 mm
130 wet days
Daylight
10.1–13.9 h
shortest–longest
Elevation
18 m
30.0°S
Clearest
Mar
55% cloud

São Jerônimo is settlement in Brazil.

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

São Jerônimo weather by month, at a glance

The whole year in one picture — sky, rain, humidity, temperature and travel score. Click any band to jump to its full chart.

Each stripe is one measure across the whole year, stacked so a single day reads top to bottom. The sky band runs overcast grey on top down to clear blue at the base — more blue means sunnier — followed by the rainfall curve, the humidity band, a temperature strip that tints each stretch of the year by how warm its average high is, and the travel-score line at the foot. Scan straight down any date to read that day across every measure at once; the score climbs highest around mid March to early December.

Temperature through the year

Average highAverage lowShaded bands: 10–90% of days

Daily average highs and lows in São Jerônimo, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.

The hot season lasts 4.3 months, from November 19 to March 30, with daily high temperatures above 27°C. The hottest month of the year in São Jerônimo is January, with an average high of 30°C and low of 21°C.

The cool season lasts 2.8 months, from May 22 to August 15, with daily high temperatures below 21°C. The coldest month of the year in São Jerônimo is July, with an average low of 10°C and high of 19°C.

Days typically run about 9°C warmer than nights year-round.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDec
Avg high (°C)Avg low (°C)
Jan3021
Feb3020
Mar2819
Apr2516
May2113
Jun1911
Jul1910
Aug2111
Sep2213
Oct2415
Nov2717
Dec2919

Average hourly temperature in São Jerônimo

A compact picture of the whole year, hour by hour: each column is a day, each row an hour, and the color is the modeled average temperature. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.

Read left to right for the day of the year and top to bottom for the hour of the day; the color is the modeled temperature, cool blues through to hot reds on the same scale as the other charts. A vertical slice is a single day's swing — coolest just before dawn, warmest in the mid-afternoon — while a horizontal slice follows one hour across the seasons. The darker overlay marks night and the lighter one the twilight around sunrise and sunset. Colors run warmest on January afternoons, near 30°C, and coldest before dawn in July, near 10°C.

JanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM

São Jerônimo weather by month

Every month at a glance. Click a month for its detailed page.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 21°1281413.74.6
Feb30° / 20°11812.613.14.7
Mar28° / 19°1051112.25.8
Apr25° / 16°1089.211.36.9
May21° / 13°1118.810.56.7
Jun19° / 11°1199.310.16.1
Jul19° / 10°1441010.36.1
Aug21° / 11°1191010.96.5
Sep22° / 13°14911.311.86.3
Oct24° / 15°17012.112.76.4
Nov27° / 17°12110.113.56.5
Dec29° / 19°11811.813.95.2

Chance of rain

How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.

São Jerônimo gets about 1510 mm of precipitation a year. On a typical day the chance of rain is often wet, but that rises and falls sharply with the seasons.

The wetter season lasts 3.4 months, from around Dec 2 to Mar 15, peaking in January at about 46% chance on a given day. The drier stretch runs the rest of the year, bottoming out around May 24.

October is the wettest month by volume, with 170 mm over about 12 wet days; March is the driest, with 105 mm.

0%10%20%30%40%50%60%JanFebMarAprMayJunJulAugSepOctNovDecwetterdrierwettermostly drysome rainoften wetvery wetJan 17 · 46%May 24 · 28%
Rain on a day (%)Rain days
Jan4514
Feb4513
Mar3611
Apr319
May299
Jun319
Jul3210
Aug3210
Sep3811
Oct3912
Nov3410
Dec3812

Monthly rainfall

Over a full year, São Jerônimo collects about 1510 mm of rain across 130 wet days — roughly 126 mm in an average month.

It doesn’t fall evenly. October is the wettest month with 170 mm, while March is the driest at just 105 mm. The three wettest months alone bring about 31% of the year’s total.

0255075100125150175200JanFebMarAprMayJunJulAugSepOctNovDec128118105108111119144119149170121118
Rainfall (mm)Rain days
Jan12814
Feb11813
Mar10511
Apr1089
May1119
Jun1199
Jul14410
Aug11910
Sep14911
Oct17012
Nov12110
Dec11812

Clouds and sunshine

ClearMostly clearPartly cloudyMostly cloudyOvercast

How often the daytime sky is clear, partly cloudy or overcast.

In São Jerônimo, the average share of the sky covered by clouds shows moderate seasonal variation over the course of the year.

The clearer part of the year begins around November 12 and lasts for 5.2 months, ending around April 18. The clearest month is December, when the sky is clear, mostly clear, or partly cloudy 53% of the time on average.

The cloudier part of the year begins around August 30 and lasts for 2.4 months, ending around November 11. The cloudiest month is October, when it is overcast or mostly cloudy 63% of the time.

0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JanFebMarAprMayJunJulAugSepOctNovDecMar 17 · 55%Oct 7 · 35%clearmostly clearpartly cloudymostly cloudyovercastclearercloudierclearer
Clearer (%)Cloudier (%)
Jan5248
Feb5149
Mar5347
Apr4951
May4654
Jun4159
Jul4753
Aug4852
Sep4258
Oct3763
Nov4951
Dec5347

Daylight, sunrise and sunset

DaylightNight

Hours of daylight through the year, with sunrise and sunset times.

The gold band is daylight — sunrise runs along its lower edge, sunset along the upper — so it widens toward summer and pinches toward winter, with night the dark area above and below. The longest day, around January 1, brings about 13 h 54 min of light; the shortest, around June 7, only 10 h 06 min — a swing of roughly 3 h 48 min.

12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDec
Daylight (h)Sunrise (AM)Sunset (PM)
Jan13.76:448:28
Feb13.17:098:14
Mar12.27:307:43
Apr11.37:497:05
May10.58:086:38
Jun10.18:256:30
Jul10.38:256:40
Aug10.98:046:58
Sep11.87:277:16
Oct12.76:507:34
Nov13.56:267:58
Dec13.96:268:21

Sunny days

How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.

São Jerônimo averages about 10 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 7 and 11 days.

The sunnier stretch runs 2.2 months, from around Nov 5 to Jan 11. The sunniest month is November, with roughly 11 sunny days (mixed).

The greyest month is October, down near 8 sunny days — about 26% fewer than the November peak.

051015JanFebMarAprMayJunJulAugSepOctNovDecgreyersunniergloomymixedNov 2411 daysOct 87 days
Sunny daysSky
Jan10Mixed
Feb8Mixed
Mar10Mixed
Apr10Mixed
May9Mixed
Jun8Mixed
Jul11Mixed
Aug11Mixed
Sep9Mixed
Oct8Gloomy
Nov10Mixed
Dec11Mixed

Humidity comfort

DryComfortableHumidMuggyOppressiveMiserable

Share of days at each humidity comfort level, based on the dew point — the measure that tracks how muggy it actually feels.

Humidity comfort is graded by the dew point — the temperature at which the air would be fully saturated — because it tracks how muggy it actually feels far better than relative humidity does. A low dew point feels dry and crisp; a high one feels sticky and oppressive no matter the reading on a humidity gauge.

In São Jerônimo, how humid it feels changes dramatically over the year.

The more humid part of the year lasts 6.0 months, from around October 25 to April 25. The muggiest month is January, when the air feels humid, muggy or worse about 93% of the time.

The most comfortable stretch runs from around April 26 to October 24, and July is the most comfortable month — the air is dry or comfortable 89% of the time.

0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJul 19 · 90%Jan 29 · 6%oppressivecomfortablemuggyhumiddryhumidcomfortablehumid
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
Jan162037351
Feb271835362
Mar4102638220
Apr1621312660
May392825700
Jun552616200
Jul622611000
Aug542916100
Sep432724600
Oct2428272010
Nov1425302740
Dec6142736170

Wind

Average wind speed through the year, banded into plain-language speed zones so a number reads as 'breezy' or 'calm' without knowing the scale.

This is the average sustained wind speed at the standard 10 metres above open ground — the steady flow a weather station reports, not the sharper gusts that come and go, which can run half again as fast. It's the number that says whether a place is generally breezy or calm.

Wind in São Jerônimo is steady company: average speeds sit near 10 km/hcalm — in every month of the year, with no meaningful windy or calm season.

051015JanFebMarAprMayJunJulAugSepOctNovDeccalmlight breezeOct 25 · 11 km/hMay 13 · 9 km/h
Wind speed (km/h)Feels
Jan10calm
Feb10calm
Mar10calm
Apr9calm
May9calm
Jun9calm
Jul10calm
Aug10calm
Sep11calm
Oct11calm
Nov11calm
Dec11calm

Best time to visit São Jerônimo

TravelBeach/poolTemperatureCloudsPrecipitation

To characterize how pleasant the weather is in São Jerônimo throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.

Around late November, São Jerônimo is still near the tail of its best-weather window — great conditions with the peak-season crowds already thinning.

Inferred from the travel-score curve; month-by-month visitor numbers are a planned addition.

The travel score favors clear, rainless days with daytime highs between 18°C and 28°C. Based on this score, the best time of year to visit São Jerônimo for general outdoor tourist activities is from mid March to early December, with a peak score in the last week of April.

0246810JanFebMarAprMayJunJulAugSepOctNovDecbest timetravel scoretemperaturecloudsprecipitationApr 27 · 7.0

The travel score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Travel score (0–10)Rating
Jan4.6fair
Feb4.8fair
Mar5.8good
Apr6.9good
May6.7good
Jun6.1good
Jul6.1good
Aug6.5good
Sep6.3good
Oct6.4good
Nov6.4good
Dec5.2fair

The beach/pool score favors clear, rainless days with daytime highs between 24°C and 34°C. Based on this score, the best time of year to visit São Jerônimo for hot-weather activities is from mid October to early May, with a peak score in the second week of March.

024681012JanFebMarAprMayJunJulAugSepOctNovDecbest timebest timebeach/pool scoretemperaturecloudsprecipitationMar 14 · 6.8

The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

What to pack for São Jerônimo, by month

EssentialRecommendedOptional

Month by month, what's worth putting in the bag — from the temperature range, rain chance, sun and wind. Tap a month for a quick packing note.

For a warm-season trip around January (highs near 30°C), the essentials are light clothes, rain gear and sun protection. In the cold season around July (highs near 19°C), pack rain gear.

Light clothing
Warm layer
Winter coat
Rain gear
Sun protection
Windbreaker

In January, São Jerônimo sees daytime highs around 30°C and nights near 21°C. Pack light clothes, rain gear and sun protection. About 14 days see rain.

UV index (midday) in São Jerônimo by month

LowModerateHighVery highExtreme

Clear-sky midday UV index through the year, shaded by the WHO exposure levels — how much sun protection each month calls for.

Under clear skies, the midday UV index in São Jerônimo peaks around January 15 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 19 at about 3 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateVery highExtremeJan 15UV 13Jun 19UV 3
UV index (midday)Level
Jan13Extreme
Feb12Extreme
Mar9Very high
Apr7Very high
May4Moderate
Jun3Moderate
Jul4Moderate
Aug5Moderate
Sep8Very high
Oct7Very high
Nov11Extreme
Dec12Extreme

Average hourly UV index in São Jerônimo

LowModerateHighVery highExtreme

Modeled clear-sky UV for every hour of every day — when in the day sun protection actually matters.

The whole year hour by hour: each column is a day, each row an hour, and the color is the modeled clear-sky UV index — the midday peak scaled down as the sun sits lower in the sky. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.

UV falls off far faster than brightness as the sun drops, so even in January the burn window is concentrated in the middle of the day: about 9 hours a day reach index 3 (protection recommended), and 6.5 hours reach 6 or more. Mornings and late afternoons stay comparatively gentle year round.

JanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM
UV ≥ 3 (h/day)UV ≥ 6 (h/day)
Jan96.5
Feb8.56.5
Mar7.55
Apr6.53
May40
Jun20
Jul30
Aug50
Sep6.53.5
Oct73.5
Nov8.56
Dec96.5

Air quality in São Jerônimo by month

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see which months the air is worst, not just the yearly average.

Air quality in São Jerônimo is worst in August — around 20 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodAug 1720 µg/m³Dec 1811 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb11Good
Mar12Good
Apr15Moderate
May17Moderate
Jun17Moderate
Jul19Moderate
Aug20Moderate
Sep19Moderate
Oct13Moderate
Nov12Good
Dec10Good
Almanac & agriculture

Growing season

Chance of a frost-free dayFrost-free year round

São Jerônimo is frost-free year round — even the coldest nights rarely reach freezing, so there is no start or end to the growing season.

0%25%50%75%100%JanFebMarAprMayJunJulAugSepOctNovDecfrost-free year round
Frost-free chance (%)Frost nights
Jan1000
Feb1000
Mar1000
Apr1000
May1000
Jun990
Jul990
Aug1000
Sep1000
Oct1000
Nov1000
Dec1000

Growing degree days

Degree days (base 10°C)Frost-free shaded

Growing degree days tally heat above 10°C: each day adds however many degrees its average temperature runs over that threshold, and cold days add nothing. São Jerônimo banks about 3,642 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around January.

01,0002,0003,0004,000JanFebMarAprMayJunJulAugSepOctNovDec
Growing degree days (°C·days)
Jan472
Feb420
Mar426
Apr324
May223
Jun149
Jul130
Aug181
Sep221
Oct299
Nov356
Dec439

Solar energy

Average daily shortwave solar energy reaching the ground, banded into brightness zones so the number means something at a glance.

Solar energy is how much sunlight actually reaches the ground each day, measured in kilowatt-hours per square metre (kWh/m²) — the combined effect of how long the sun is up, how high it climbs, and how much cloud gets in the way. It's the raw fuel a solar panel has to work with: for scale, 1 kWh/m² a day is dim and wintry, while 7+ is desert-bright.

São Jerônimo receives about 4.4 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 2.3 and 6.5 kWh/m².

The brighter stretch of the year lasts 5.8 months, from around Oct 2 to Mar 28. The brightest month is December, averaging about 6.4 kWh/m² (intense).

The dimmest month is June, down near 2.4 kWh/m² — roughly 63% less than the December peak.

012345678JanFebMarAprMayJunJulAugSepOctNovDecbrighterdimmerbrighterdimmoderatebrightintenseDec 136.5 kWhJun 242.3 kWh
Solar energy (kWh/m²)Level
Jan6.2Intense
Feb5.6Bright
Mar4.8Bright
Apr3.7Moderate
May2.8Moderate
Jun2.4Moderate
Jul2.5Moderate
Aug3.3Moderate
Sep4.0Bright
Oct4.8Bright
Nov6.1Intense
Dec6.5Intense

Where is São Jerônimo?

São Jerônimo sits at 30.0°S, 51.7°W, 18 m above sea level, in Brazil. The nearest listed city is Triunfo, 2.0 km away.

Topography around São Jerônimo

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

Within 3 km, the terrain around São Jerônimo has only modest variations in elevation — a maximum elevation change of 46 m around an average of 13 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 168 m; within 80 km, large variations in elevation — a maximum elevation change of 740 m.

The land around São Jerônimo is covered by trees (38%) and water (21%) within 3 km, trees (40%), grassland (30%) and cropland (20%) within 16 km, and trees (53%) within 80 km.

3 km
46 m
16 km
168 m
80 km
740 m
treesgrasslandcroplandartificial surfaceswaterwetland
Nearby: Triunfo 2.0 km · Charqueadas 9.0 km · Eldorado do Sul 17 km · Taquari 22 km · Butiá 29 km · Montenegro 39 km · Guaíba 42 km · Nova Santa Rita 45 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 São Jerônimo (-29.9592°, -51.7222°, elevation 18 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).