São Lourenço do Sul weather in September

In September, São Lourenço do Sul sees average daytime highs of 20°C and overnight lows near 13°C, with 139 mm of rain across 11 wet days and about 11.8 hours of daylight. It is the 9th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 20°C through the month. The sky is clear or mostly clear about 28% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 18 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 Lourenço do Sul's 11th-clearest and 3rd-windiest month. For the whole year in context, see São Lourenço do Sul's year-round climate.

Daytime high
20°
9th warmest
Overnight low
13°
4th coldest
Rainfall
139 mm
11 wet days
Daylight
11 h 48 min
7:28 AM – 7:17 PM
Cloud cover
64%
11th clearest
Wind
16 km/h
3rd windiest
Solar energy
4.17 kWh/m²
Travel score
5.9
out of 10

São Lourenço do Sul is human 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 20°C through the month.

A typical September day in São Lourenço do Sul reaches about 20°C in the afternoon and slips back to 13°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 24°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)
11912
21912
31912
41912
51912
61912
71912
81912
91912
101912
111913
121913
131913
141913
152013
162013
172013
182013
192013
202013
212013
222013
232013
242013
252013
262013
272013
282014
292014
302014

São Lourenço do Sul weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 21°1101413.85.9
Feb27° / 21°11213.313.15.8
Mar26° / 20°10112.512.26.3
Apr24° / 17°1029.711.36.9
May20° / 14°101910.46.5
Jun18° / 11°1039.2105.9
Jul17° / 10°11910.110.25.6
Aug19° / 11°1169.910.96.1
Sep20° / 13°1391111.85.9
Oct22° / 15°13712.512.86.2
Nov24° / 17°989.913.66.9
Dec27° / 19°10411.4146.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 28% 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 61%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14258
24258
34258
44159
54159
64060
74060
83961
93961
103961
113961
123961
133961
144060
153961
163961
174060
184060
194060
204060
214060
224060
234060
244060
253862
263862
273862
283763
293664
303664

Chance of precipitation in September

Any precipitation

São Lourenço do Sul gets around 139 mm of rain over 11 wet days in September, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 37% and peaks near 39% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
138
238
339
439
539
639
739
839
939
1039
1138
1238
1338
1437
1537
1637
1736
1836
1935
2035
2135
2235
2335
2435
2536
2636
2737
2837
2938
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 50% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
15328181
25328181
35228191
45228191
55228191
65327191
75327191
85327191
95327191
105128201
115128201
125128201
135128201
145029201
155029201
165029192
175029192
185029192
195029192
205029192
215029192
224929192
234930192
244830203
254730203
264730203
274630213
284530213
294530214
304430224

Wind in September

Winds average 16 km/h in September.

Across September, daily wind ranges from about 15 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
115light breeze
215light breeze
316light breeze
416light breeze
516light breeze
616light breeze
716light breeze
816light breeze
916light breeze
1016light breeze
1116light breeze
1216light breeze
1316light breeze
1416light breeze
1516light breeze
1616light breeze
1716light breeze
1816light breeze
1916light breeze
2016light breeze
2116light breeze
2216light breeze
2316light breeze
2416light breeze
2516light breeze
2617light breeze
2717light breeze
2817light breeze
2917light breeze
3017light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 18 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 60 minutes over September. Sunrise moves from 7:48 AM to 7:09 AM, and sunset from 7:07 PM to 7:25 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.37:487:07
211.47:467:08
311.47:457:09
411.47:447:09
511.57:437:10
611.57:417:11
711.57:407:11
811.67:397:12
911.67:377:12
1011.67:367:13
1111.67:357:14
1211.77:337:14
1311.77:327:15
1411.77:317:15
1511.87:297:16
1611.87:287:17
1711.87:277:17
1811.97:257:18
1911.97:247:18
2011.97:227:19
2112.07:217:20
2212.07:207:20
2312.07:187:21
2412.17:177:22
2512.17:167:22
2612.17:147:23
2712.27:137:23
2812.27:127:24
2912.27:107:25
3012.37:097:25

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.17 kWh/m².

For context, solar energy here swings from a low near 2.45 kWh/m² to a high of 6.87 kWh/m² in December across the year — September's 4.17 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
13.7Moderate
23.8Moderate
33.8Moderate
43.8Moderate
53.8Moderate
63.9Moderate
73.9Moderate
83.9Moderate
93.9Moderate
104.0Moderate
114.0Bright
124.0Bright
134.1Bright
144.1Bright
154.1Bright
164.2Bright
174.2Bright
184.3Bright
194.3Bright
204.3Bright
214.4Bright
224.4Bright
234.4Bright
244.5Bright
254.5Bright
264.5Bright
274.5Bright
284.6Bright
294.6Bright
304.6Bright
Planning a trip in September

Is September a good time to visit São Lourenço do Sul?

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

5.9
Sightseeing
8th-best month of the year
2.9
Beach & pool
9th-best month of the year

September is a reasonable time to visit São Lourenço do Sul for sightseeing.

What to pack for São Lourenço do Sul in September

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

In September, São Lourenço do Sul sees daytime highs around 20°C and nights near 13°C. Worth packing: rain gear. About 11 days see rain.

rain gear

Sea temperature near São Lourenço do Sul in September

The nearest coast averages about 16°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in February at about 26°C and coldest in July near 14°C.

It's comfortable for a long swim from Oct 31 to May 3 — about 6.1 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swimcomfortable to swim
Sea temperature (°C)Comfort
Jan25Warm
Feb26Warm
Mar25Warm
Apr22Refreshing
May19Cool
Jun16Cool
Jul14Bracing
Aug15Bracing
Sep16Cool
Oct19Cool
Nov21Refreshing
Dec24Refreshing

UV index in São Lourenço do Sul in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — 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 Lourenço do Sul peaks around December 22 at about 12 (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 highExtremeDec 22UV 12Jun 19UV 3
UV index (midday)Level
Jan12Extreme
Feb12Extreme
Mar9Very high
Apr7High
May4Moderate
Jun3Moderate
Jul4Moderate
Aug5Moderate
Sep7Very high
Oct8Very high
Nov11Extreme
Dec13Extreme
Location & terrain

Where is São Lourenço do Sul?

São Lourenço do Sul sits at 31.4°S, 52.0°W, 13 m above sea level, in Brazil. The nearest listed city is Pelotas, 57 km away.

Topography around São Lourenço do Sul

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

Within 3 km, the terrain around São Lourenço do Sul has only modest variations in elevation — a maximum elevation change of 30 m around an average of 6 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 199 m; within 80 km, significant variations in elevation — a maximum elevation change of 507 m.

The land around São Lourenço do Sul is covered by water (26%) and cropland (23%) within 3 km, water (38%) and cropland (31%) within 16 km, and water (35%) and trees (28%) within 80 km.

3 km
30 m
16 km
199 m
80 km
507 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Pelotas 57 km · Camaquã 59 km · Capão do Leão 65 km · Canguçu 66 km · São José do Norte 72 km · Rio Grande 75 km · Encruzilhada do Sul 105 km · Piratini 107 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 Lourenço do Sul (-31.3653°, -51.9783°, elevation 13 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).