Barra de São Francisco weather in September

In September, Barra de São Francisco sees average daytime highs of 28°C and overnight lows near 18°C, with 23 mm of rain across 5.3 wet days and about 11.9 hours of daylight. It is the 8th-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 26% of the time in September, and the air most often feels humid.

Daylight stretches from about 11 h 36 min at the start of September to 12 h 12 min by month's end. Set against the rest of the year, September is Barra de São Francisco's 4th-clearest and 2nd-windiest month. For the whole year in context, see Barra de São Francisco's year-round climate.

Daytime high
28°
8th warmest
Overnight low
18°
4th coldest
Rainfall
23 mm
5.3 wet days
Daylight
11 h 54 min
6:41 AM – 6:35 PM
Cloud cover
60%
4th clearest
Wind
10 km/h
2nd windiest
Solar energy
4.67 kWh/m²
Travel score
6.7
out of 10

Barra de São Francisco 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 28°C through the month.

A typical September day in Barra de São Francisco reaches about 28°C in the afternoon and slips back to 18°C overnight — a 10°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, September runs about 1°C warmer than August and about 1°C cooler than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12717
22717
32817
42817
52817
62817
72817
82817
92817
102817
112817
122818
132818
142818
152818
162818
172818
182818
192818
202818
212818
222818
232818
242818
252818
262818
272818
282818
292818
302818

How September really feels in Barra de São Francisco

Once humidity and wind are folded in, September averages 0 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
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Barra de São Francisco weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 21°13412.9134.3
Feb31° / 21°829.912.64.3
Mar30° / 21°10413.412.14.3
Apr29° / 20°6010.611.65.3
May27° / 18°266.311.16.8
Jun26° / 17°154.210.97.5
Jul26° / 16°144.7117.5
Aug27° / 16°134.611.47.4
Sep28° / 18°235.311.96.7
Oct29° / 19°771012.45.4
Nov29° / 20°17315.812.94.6
Dec30° / 21°19016.713.14.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 26% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 20% of September, with mostly cloudy or overcast conditions the remaining 54%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15545
25545
35545
45446
55446
65347
75347
85248
95149
105050
114951
124852
134852
144852
154753
164654
174555
184555
194357
204357
214258
224060
233961
243961
253961
263862
273763
283664
293664
303565

Chance of precipitation in September

Any precipitation

Barra de São Francisco gets around 23 mm of rain over 5.3 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 18% and peaks near 24% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
113
213
313
413
513
613
714
814
914
1015
1115
1216
1316
1417
1518
1618
1719
1819
1920
2020
2121
2221
2321
2422
2522
2623
2723
2824
2924
3024

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the humid band about 58% of days. Sticky, muggy-or-worse air turns up on roughly 19% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
15255911
26255811
36255811
46255811
56245911
65246011
75246011
85236111
95226112
105216212
115216113
124206214
134196215
144186216
153186217
163176218
173176020
183175921
193165922
203165823
213165724
223165625
233155626
243155527
253155428
263155329
273155230
283145132
293145033
303145034

Wind in September

Winds average 10 km/h in September.

Across September, daily wind ranges from about 9 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 36 min at the start of September to 12 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 36 minutes over September. Sunrise moves from 6:54 AM to 6:28 AM, and sunset from 6:32 PM to 6:37 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.66:546:32
211.66:546:32
311.76:536:32
411.76:526:33
511.76:516:33
611.76:506:33
711.76:496:33
811.86:486:33
911.86:476:34
1011.86:476:34
1111.86:466:34
1211.86:456:34
1311.86:446:34
1411.96:436:34
1511.96:426:35
1611.96:416:35
1711.96:406:35
1811.96:396:35
1911.96:386:35
2012.06:376:35
2112.06:366:36
2212.06:366:36
2312.06:356:36
2412.06:346:36
2512.16:336:36
2612.16:326:37
2712.16:316:37
2812.16:306:37
2912.16:296:37
3012.26:286:37

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.67 kWh/m².

For context, solar energy here swings from a low near 3.38 kWh/m² to a high of 6.02 kWh/m² in February across the year — September's 4.67 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.5Bright
54.6Bright
64.6Bright
74.6Bright
84.6Bright
94.6Bright
104.6Bright
114.6Bright
124.7Bright
134.7Bright
144.7Bright
154.7Bright
164.7Bright
174.7Bright
184.7Bright
194.7Bright
204.7Bright
214.7Bright
224.7Bright
234.7Bright
244.7Bright
254.8Bright
264.8Bright
274.8Bright
284.8Bright
294.8Bright
304.8Bright
Planning a trip in September

Hazard calendar for Barra de São Francisco

In seasonPeak

None of Barra de São Francisco's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Barra de São Francisco's monsoon runs November–January, when most of the year's rain falls.

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

Is September a good time to visit Barra de São Francisco?

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

6.7
Sightseeing
5th-best month of the year
7.4
Beach & pool
1st-best month of the year

September is a reasonable time to visit Barra de São Francisco for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Barra de São Francisco in September

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

In September, Barra de São Francisco sees daytime highs around 28°C and nights near 18°C. Pack light clothes. Worth having: sun protection. About 5 days see rain.

light clothessun protection

UV index in Barra de São Francisco in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Barra de São Francisco peaks around February 13 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 22 at about 7 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeFeb 13UV 15Jun 22UV 7
UV index (midday)Level
Jan14Extreme
Feb15Extreme
Mar13Extreme
Apr10Extreme
May8Very high
Jun7High
Jul7Very high
Aug9Very high
Sep11Extreme
Oct12Extreme
Nov14Extreme
Dec13Extreme
Location & terrain

Where is Barra de São Francisco?

Barra de São Francisco sits at 18.8°S, 40.9°W, 197 m above sea level, in Brazil. The nearest listed city is Mantena, 10 km away.

Topography around Barra de São Francisco

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

Within 3 km, the terrain around Barra de São Francisco has significant variations in elevation — a maximum elevation change of 335 m around an average of 251 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 732 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,584 m.

The land around Barra de São Francisco is covered by grassland (57%) and trees (32%) within 3 km, grassland (69%) and trees (29%) within 16 km, and grassland (67%) and trees (33%) within 80 km.

3 km
335 m
16 km
732 m
80 km
1,584 m
treesgrasslandartificial surfacesbare terrain
September weather nearby: Mantena 10 km · Ecoporanga 43 km · São Gabriel da Palha 47 km · Nova Venécia 52 km · Pancas 52 km · Resplendor 74 km · Conselheiro Pena 77 km · Rio Bananal 82 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 Barra de São Francisco (-18.755°, -40.8908°, elevation 197 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).