Gandu weather in September

In September, Gandu sees average daytime highs of 26°C and overnight lows near 18°C, with 59 mm of rain across 16.7 wet days and about 11.9 hours of daylight. It is the 9th-warmest and 12th-wettest month of the year here.

Day-to-day highs hold fairly steady near 26°C through the month. The sky is clear or mostly clear about 15% of the time in September, and the air most often feels muggy.

Daylight stretches from about 11 h 42 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Gandu's 1st-clearest and 2nd-windiest month. For the whole year in context, see Gandu's year-round climate.

Daytime high
26°
9th warmest
Overnight low
18°
3rd coldest
Rainfall
59 mm
16.7 wet days
Daylight
11 h 54 min
5:35 AM – 5:30 PM
Cloud cover
60%
1st clearest
Wind
8 km/h
2nd windiest
Solar energy
4.57 kWh/m²
Travel score
5.6
out of 10

Gandu 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 26°C through the month.

A typical September day in Gandu reaches about 26°C in the afternoon and slips back to 18°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 28°C. Set against its neighbours, September runs about 1°C warmer than August and about 1°C cooler than October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12518
22518
32518
42518
52518
62518
72518
82518
92618
102618
112618
122618
132618
142618
152618
162618
172618
182618
192618
202619
212619
222619
232619
242619
252619
262619
272619
282619
292619
302719

How September really feels in Gandu

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.

Gandu weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 21°9319.612.74.3
Feb29° / 21°7718.712.54.1
Mar29° / 21°10121.812.14.0
Apr28° / 21°9522.411.74.3
May26° / 20°7419.211.45.2
Jun25° / 19°7219.711.25.3
Jul24° / 18°802111.35.3
Aug25° / 17°7019.411.55.4
Sep26° / 18°5916.711.95.6
Oct27° / 20°6816.812.35.5
Nov28° / 21°10717.712.65.1
Dec29° / 21°9216.212.84.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 15% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 40% of September, with mostly cloudy or overcast conditions the remaining 44%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15545
25545
35446
45545
55446
65446
75347
85446
95347
105446
115446
125446
135644
145644
155743
165743
175743
185842
195842
205842
215842
225842
235842
245743
255743
265644
275644
285644
295644
305644

Chance of precipitation in September

Any precipitation

Gandu gets around 59 mm of rain over 16.7 wet days in September, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 56% and peaks near 58% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
158
257
357
457
557
657
757
857
956
1057
1157
1257
1357
1457
1557
1657
1757
1857
1956
2056
2156
2256
2355
2455
2554
2654
2754
2854
2954
3054

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 73% of days. Sticky, muggy-or-worse air turns up on roughly 76% of them.

0%25%50%75%100%151015202530
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1235621
2334621
3334621
4333631
5333631
6332641
7331651
8330661
9329671
10328681
11327691
12326692
13224722
14223732
15221752
16220762
17219772
18118783
19117793
20116803
21115804
22115804
23114805
24113806
25113806
26113797
27112798
28112798
29112789
301127710

Wind in September

Winds average 8 km/h in September.

Across September, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
299calm
309calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 42 min at the start of September to 12 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 24 minutes over September. Sunrise moves from 5:46 AM to 5:24 AM, and sunset from 5:30 PM to 5:31 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.75:465:30
211.75:455:30
311.85:445:30
411.85:445:30
511.85:435:30
611.85:425:30
711.85:415:30
811.85:415:30
911.85:405:30
1011.85:395:30
1111.95:385:30
1211.95:385:30
1311.95:375:30
1411.95:365:30
1511.95:355:30
1611.95:355:30
1711.95:345:30
1812.05:335:30
1912.05:325:30
2012.05:315:30
2112.05:315:30
2212.05:305:30
2312.05:295:30
2412.05:285:30
2512.05:285:30
2612.15:275:30
2712.15:265:30
2812.15:255:30
2912.15:255:30
3012.15:245:31

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.57 kWh/m².

For context, solar energy here swings from a low near 3.28 kWh/m² to a high of 5.63 kWh/m² in January across the year — September's 4.57 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.3Bright
24.3Bright
34.3Bright
44.3Bright
54.4Bright
64.4Bright
74.4Bright
84.4Bright
94.5Bright
104.5Bright
114.5Bright
124.5Bright
134.5Bright
144.6Bright
154.6Bright
164.6Bright
174.6Bright
184.7Bright
194.7Bright
204.7Bright
214.7Bright
224.7Bright
234.7Bright
244.8Bright
254.8Bright
264.8Bright
274.8Bright
284.8Bright
294.9Bright
304.9Bright
Planning a trip in September

Is September a good time to visit Gandu?

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

5.6
Sightseeing
1st-best month of the year
5.3
Beach & pool
6th-best month of the year

September is a reasonable time to visit Gandu for sightseeing.

What to pack for Gandu in September

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

In September, Gandu sees daytime highs around 26°C and nights near 18°C. Pack rain gear. Worth having: light clothes and sun protection. About 17 days see rain.

rain gearlight clothessun protection

Sea temperature near Gandu in September

The nearest coast averages about 26°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 67 km away) is warmest in March at about 28°C and coldest in August near 25°C.

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

24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan28Warm
Feb28Tropical
Mar28Tropical
Apr28Tropical
May28Warm
Jun26Warm
Jul26Warm
Aug25Warm
Sep26Warm
Oct26Warm
Nov27Warm
Dec27Warm

UV index in Gandu 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 Gandu peaks around February 19 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 22 at about 8 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeFeb 19UV 15Jun 22UV 8
UV index (midday)Level
Jan14Extreme
Feb15Extreme
Mar15Extreme
Apr12Extreme
May9Very high
Jun8Very high
Jul8Very high
Aug10Very high
Sep11Extreme
Oct13Extreme
Nov14Extreme
Dec12Extreme
Location & terrain

Where is Gandu?

Gandu sits at 13.7°S, 39.5°W, 159 m above sea level, in Brazil. The nearest listed city is Wenceslau Guimarães, 7.0 km away.

Topography around Gandu

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

Within 3 km, the terrain around Gandu has significant variations in elevation — a maximum elevation change of 270 m around an average of 208 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 520 m; within 80 km, large variations in elevation — a maximum elevation change of 970 m.

The land around Gandu is covered by trees (78%) within 3 km, trees (84%) within 16 km, and trees (63%) and grassland (24%) within 80 km.

3 km
270 m
16 km
520 m
80 km
970 m
treesgrasslandartificial surfaceswatermangroves
September weather nearby: Wenceslau Guimarães 7.0 km · Teolândia 16 km · Presidente Tancredo Neves 33 km · Ituberá 37 km · Ibirataia 40 km · Camamu 47 km · Taperoá 48 km · Ibirapitanga 48 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 Gandu (-13.7439°, -39.4867°, elevation 159 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).