São Jerônimo weather in September

In September, São Jerônimo sees average daytime highs of 22°C and overnight lows near 13°C, with 149 mm of rain across 11.3 wet days and about 11.8 hours of daylight. It is the 8th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 22°C through the month. The sky is clear or mostly clear about 31% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 24 min at the start of September to 12 h 18 min by month's end. Set against the rest of the year, September is São Jerônimo's 10th-clearest and 2nd-windiest month. For the whole year in context, see São Jerônimo's year-round climate.

Daytime high
22°
8th warmest
Overnight low
13°
4th coldest
Rainfall
149 mm
11.3 wet days
Daylight
11 h 48 min
7:27 AM – 7:16 PM
Cloud cover
62%
10th clearest
Wind
11 km/h
2nd windiest
Solar energy
4.03 kWh/m²
Travel score
6.3
out of 10

São Jerônimo is settlement in Brazil.

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 22°C through the month.

A typical September day in São Jerônimo reaches about 22°C in the afternoon and slips back to 13°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 28°C. Set against its neighbours, September runs about 1°C warmer than August and about 2°C cooler than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12212
22212
32212
42212
52212
62212
72213
82213
92213
102213
112213
122213
132213
142213
152213
162213
172213
182213
192213
202213
212213
222213
232213
242213
252213
262213
272214
282214
292314
302314

São Jerônimo weather by month

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

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

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 11% of September, with mostly cloudy or overcast conditions the remaining 58%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14654
24654
34555
44456
54357
64357
74456
84258
94258
104159
114258
124258
134159
144258
154258
164159
174159
184159
194258
204258
214357
224258
234159
244159
254159
264159
273961
283862
293961
303763

Chance of precipitation in September

Any precipitation

São Jerônimo gets around 149 mm of rain over 11.3 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 38% and peaks near 39% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
135
235
336
436
537
637
738
838
938
1038
1138
1238
1338
1438
1538
1638
1738
1838
1938
2038
2138
2237
2338
2438
2538
2638
2738
2839
2939
3039

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 43% of days. Sticky, muggy-or-worse air turns up on roughly 6% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
14725244
24625244
34625254
44626254
54626244
64526244
74527244
84527244
94527244
104427244
114428244
124328244
134328255
144328255
154328255
164228255
174327255
184327255
194327246
204327246
214327246
224227246
234228247
244128247
254128247
264028248
273928258
283928259
293828259
3037282510

Wind in September

Winds average 11 km/h in September.

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

051015151015202530
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
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 24 min at the start of September to 12 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 54 minutes over September. Sunrise moves from 7:46 AM to 7:09 AM, and sunset from 7:08 PM to 7:24 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.47:467:08
211.47:447:08
311.47:437:09
411.57:427:09
511.57:417:10
611.57:397:10
711.57:387:11
811.67:377:11
911.67:367:12
1011.67:347:13
1111.77:337:13
1211.77:327:14
1311.77:307:14
1411.87:297:15
1511.87:287:15
1611.87:277:16
1711.97:257:16
1811.97:247:17
1911.97:237:18
2011.97:217:18
2112.07:207:19
2212.07:197:19
2312.07:177:20
2412.17:167:20
2512.17:157:21
2612.17:147:22
2712.27:127:22
2812.27:117:23
2912.27:107:23
3012.37:097:24

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.03 kWh/m².

For context, solar energy here swings from a low near 2.37 kWh/m² to a high of 6.48 kWh/m² in December across the year — September's 4.03 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
13.7Moderate
23.7Moderate
33.8Moderate
43.8Moderate
53.8Moderate
63.8Moderate
73.8Moderate
83.8Moderate
93.9Moderate
103.9Moderate
113.9Moderate
123.9Moderate
133.9Moderate
144.0Moderate
154.0Moderate
164.0Bright
174.0Bright
184.1Bright
194.1Bright
204.1Bright
214.2Bright
224.2Bright
234.2Bright
244.3Bright
254.3Bright
264.3Bright
274.3Bright
284.3Bright
294.3Bright
304.4Bright
Planning a trip in September

Is September a good time to visit São Jerônimo?

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

6.3
Sightseeing
6th-best month of the year
4.4
Beach & pool
8th-best month of the year

September is a reasonable time to visit São Jerônimo for sightseeing.

What to pack for São Jerônimo in September

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

In September, São Jerônimo sees daytime highs around 22°C and nights near 13°C. Worth packing: rain gear. About 11 days see rain.

rain gear

UV index in São Jerônimo in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

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

Air quality in São Jerônimo in September

GoodModeratePoorUnhealthyVery unhealthy

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

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
September weather 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).