Guaratinguetá weather in September

In September, Guaratinguetá sees average daytime highs of 25°C and overnight lows near 14°C, with 91 mm of rain across 10.9 wet days and about 11.9 hours of daylight. It is the 8th-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 25°C through the month. The sky is clear or mostly clear about 38% of the time in September, and the air most often feels comfortable.

Daylight stretches from about 11 h 30 min at the start of September to 12 h 12 min by month's end. Set against the rest of the year, September is Guaratinguetá's 5th-clearest and 1st-windiest month. For the whole year in context, see Guaratinguetá's year-round climate.

Daytime high
25°
8th warmest
Overnight low
14°
5th coldest
Rainfall
91 mm
10.9 wet days
Daylight
11 h 54 min
6:59 AM – 6:51 PM
Cloud cover
55%
5th clearest
Wind
6 km/h
1st windiest
Solar energy
4.92 kWh/m²
Travel score
6.7
out of 10

Guaratinguetá 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 25°C through the month.

A typical September day in Guaratinguetá reaches about 25°C in the afternoon and slips back to 14°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 30°C. Set against its neighbours, September runs about 1°C warmer than August and on par with October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12513
22513
32514
42514
52514
62514
72514
82514
92514
102514
112514
122514
132514
142514
152515
162515
172515
182515
192515
202515
212515
222515
232515
242515
252515
262515
272515
282515
292515
302515

Guaratinguetá weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 19°29624.113.24.3
Feb28° / 19°21019.512.84.6
Mar27° / 18°19620.512.24.9
Apr26° / 16°7911.411.56.5
May23° / 14°558.410.97.2
Jun23° / 12°335.810.67.7
Jul23° / 12°355.210.77.8
Aug24° / 12°375.811.27.9
Sep25° / 14°9110.911.96.7
Oct26° / 16°14416.412.55.6
Nov26° / 17°20719.513.15.0
Dec27° / 18°25422.813.44.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 38% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 48%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16634
26535
36436
46337
56238
66139
75941
85842
95743
105644
115545
125446
135347
145347
155248
165050
175050
184951
194852
204852
214753
224555
234555
244456
254357
264258
274159
284159
294060
303862

Chance of precipitation in September

Any precipitation

Guaratinguetá gets around 91 mm of rain over 10.9 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 36% and peaks near 49% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
125
226
326
427
527
628
728
829
930
1030
1131
1232
1332
1433
1534
1635
1736
1837
1938
2039
2141
2242
2343
2444
2545
2646
2747
2848
2949
3049

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the comfortable band about 43% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1543880
2533980
3523990
45040100
55040100
64841110
74741120
84542130
94442140
104243150
114143160
123944170
133744180
143645190
153445200
163346210
173246220
183046240
192946250
202845260
212745271
222644291
232544301
242443312
252442322
262342332
272241343
282140353
292140363
302039374

Wind in September

Winds average 6 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 6 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 30 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 42 minutes over September. Sunrise moves from 7:14 AM to 6:44 AM, and sunset from 6:47 PM to 6:56 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.57:146:47
211.67:136:47
311.67:126:47
411.67:116:48
511.67:106:48
611.67:096:48
711.77:086:48
811.77:076:49
911.77:066:49
1011.77:056:49
1111.87:046:50
1211.87:036:50
1311.87:026:50
1411.87:016:51
1511.87:006:51
1611.96:596:51
1711.96:586:51
1811.96:576:52
1911.96:566:52
2012.06:556:52
2112.06:546:53
2212.06:536:53
2312.06:526:53
2412.16:516:54
2512.16:506:54
2612.16:496:54
2712.16:486:55
2812.16:476:55
2912.26:456:55
3012.26:446:56

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.92 kWh/m².

For context, solar energy here swings from a low near 3.55 kWh/m² to a high of 5.61 kWh/m² in February across the year — September's 4.92 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.9Bright
45.0Bright
55.0Bright
65.0Bright
75.0Bright
85.0Bright
95.0Bright
105.0Bright
115.0Bright
124.9Bright
134.9Bright
144.9Bright
154.9Bright
164.9Bright
174.9Bright
184.9Bright
194.9Bright
204.9Bright
214.9Bright
224.9Bright
234.9Bright
244.9Bright
254.9Bright
264.9Bright
274.9Bright
285.0Bright
295.0Bright
305.0Bright
Planning a trip in September

Hazard calendar for Guaratinguetá

In seasonPeak

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

Guaratinguetá's rainy season runs October–March, when most of the year's rain falls.

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

Is September a good time to visit Guaratinguetá?

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
6.2
Beach & pool
2nd-best month of the year

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

What to pack for Guaratinguetá in September

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

In September, Guaratinguetá sees daytime highs around 25°C and nights near 14°C. Worth packing: light clothes, rain gear and sun protection. About 11 days see rain.

light clothesrain gearsun protection

Sea temperature near Guaratinguetá in September

The nearest coast averages about 22°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 February at about 27°C and coldest in August near 21°C.

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

20°22°24°26°28°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan27Warm
Feb27Warm
Mar27Warm
Apr26Warm
May24Warm
Jun23Refreshing
Jul22Refreshing
Aug21Refreshing
Sep22Refreshing
Oct23Refreshing
Nov23Refreshing
Dec25Warm

UV index in Guaratinguetá 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 Guaratinguetá peaks around January 24 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 11 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighVery highExtremeJan 24UV 15Jul 11UV 6
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar13Extreme
Apr10Very high
May7High
Jun6High
Jul6High
Aug8Very high
Sep7Very high
Oct12Extreme
Nov14Extreme
Dec15Extreme

Air quality in Guaratinguetá 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 Guaratinguetá is worst in September — around 19 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (December, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1518 µg/m³Dec 209 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb10Good
Mar10Good
Apr11Good
May13Moderate
Jun13Moderate
Jul13Moderate
Aug14Moderate
Sep19Moderate
Oct13Moderate
Nov10Good
Dec9Good
Location & terrain

Where is Guaratinguetá?

Guaratinguetá sits at 22.8°S, 45.2°W, 545 m above sea level, in Brazil. The nearest listed city is Aparecida, 5.0 km away.

Topography around Guaratinguetá

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

Within 3 km, the terrain around Guaratinguetá has only modest variations in elevation — a maximum elevation change of 200 m around an average of 560 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 828 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,756 m.

The land around Guaratinguetá is covered by grassland (35%), artificial surfaces (31%) and trees (28%) within 3 km, grassland (50%) and trees (33%) within 16 km, and trees (52%) and grassland (38%) within 80 km.

3 km
200 m
16 km
828 m
80 km
2,756 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Aparecida 5.0 km · Potim 7.0 km · Lorena 12 km · Cachoeira Paulista 25 km · Pindamonhangaba 30 km · Cruzeiro 35 km · Cunha 37 km · Tremembé 40 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 Guaratinguetá (-22.8164°, -45.1925°, elevation 545 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. 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).