Guapiaçu weather in September

In September, Guapiaçu sees average daytime highs of 31°C and overnight lows near 19°C, with 58 mm of rain across 6.5 wet days and about 11.9 hours of daylight. It is the 2nd-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 56% of the time in September, and the air most often feels dry.

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 Guapiaçu's 4th-clearest and 1st-windiest month. For the whole year in context, see Guapiaçu's year-round climate.

Daytime high
31°
2nd warmest
Overnight low
19°
5th coldest
Rainfall
58 mm
6.5 wet days
Daylight
11 h 54 min
7:15 AM – 7:08 PM
Cloud cover
40%
4th clearest
Wind
11 km/h
1st windiest
Solar energy
5.75 kWh/m²
Travel score
5.0
out of 10

Guapiaçu 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 31°C through the month.

A typical September day in Guapiaçu reaches about 31°C in the afternoon and slips back to 19°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 35°C. Set against its neighbours, September runs about 2°C warmer than August and on par with October.

10°20°30°40°151015202530
Avg high (°C)Avg low (°C)
13118
23118
33118
43118
53119
63119
73119
83119
93119
103119
113119
123119
133119
143119
153119
163119
173119
183119
193119
203119
213119
223119
233119
243120
253120
263120
273120
283120
293120
303120

How September really feels in Guapiaçu

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.

Guapiaçu weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 22°26423.213.13.4
Feb30° / 22°18919.812.73.6
Mar30° / 21°17219.112.14.0
Apr29° / 20°629.111.55.6
May27° / 17°445.1117.4
Jun27° / 16°243.110.87.9
Jul28° / 16°152.110.98.0
Aug30° / 17°182.511.36.5
Sep31° / 19°586.511.95.0
Oct31° / 21°11112.112.54.1
Nov31° / 21°16617133.9
Dec30° / 22°22422.313.23.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 56% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 32%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17921
27921
37822
47822
57723
67624
77525
87525
97426
107327
117327
127228
137129
147030
156931
166832
176832
186733
196634
206535
216436
226337
236238
246238
256040
265941
275842
285842
295644
305644

Chance of precipitation in September

Any precipitation

Guapiaçu gets around 58 mm of rain over 6.5 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 22% and peaks near 32% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
114
214
315
415
516
616
716
817
917
1017
1118
1218
1319
1419
1520
1621
1722
1823
1923
2024
2125
2226
2327
2428
2529
2630
2730
2831
2932
3032

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 38% of days. Sticky, muggy-or-worse air turns up on roughly 13% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
159241430
258241530
356241640
456231740
554231850
654231850
752231960
850232070
948242170
1047242280
1145242290
1243252390
13422523100
14402524110
15382625110
16372625120
17352626130
18342726130
19322726140
20312727150
21292727160
22282728170
23272728190
24252628201
25242628211
26232528231
27222528241
28212428251
29202428271
30192328282

Wind in September

Winds average 11 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 10 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
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 7:29 AM to 7:01 AM, and sunset from 7:04 PM to 7:11 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.67:297:04
211.67:287:04
311.67:277:05
411.67:267:05
511.77:257:05
611.77:247:05
711.77:237:06
811.77:237:06
911.77:227:06
1011.87:217:06
1111.87:207:06
1211.87:197:07
1311.87:187:07
1411.87:177:07
1511.97:167:07
1611.97:157:08
1711.97:147:08
1811.97:137:08
1911.97:127:08
2012.07:117:09
2112.07:107:09
2212.07:097:09
2312.07:087:09
2412.07:077:10
2512.17:067:10
2612.17:057:10
2712.17:047:10
2812.17:037:11
2912.17:027:11
3012.27:017:11

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.75 kWh/m².

For context, solar energy here swings from a low near 3.94 kWh/m² to a high of 6.11 kWh/m² in October across the year — September's 5.75 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.6Bright
55.6Bright
65.6Bright
75.6Bright
85.7Bright
95.7Bright
105.7Bright
115.7Bright
125.7Bright
135.7Bright
145.7Bright
155.7Bright
165.8Bright
175.8Bright
185.8Bright
195.8Bright
205.8Bright
215.8Bright
225.8Bright
235.8Bright
245.8Bright
255.8Bright
265.9Bright
275.9Bright
285.9Bright
295.9Bright
305.9Bright
Planning a trip in September

Hazard calendar for Guapiaçu

In seasonPeak

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

Guapiaçu's monsoon runs November–March, 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 Guapiaçu?

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

5.0
Sightseeing
6th-best month of the year
7.4
Beach & pool
5th-best month of the year

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

What to pack for Guapiaçu in September

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

In September, Guapiaçu sees daytime highs around 31°C and nights near 19°C. Pack light clothes. Worth having: sun protection. About 7 days see rain.

light clothessun protection

UV index in Guapiaçu in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Guapiaçu peaks around January 22 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 20 at about 7 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighVery highExtremeJan 22UV 15Jun 20UV 7
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar13Extreme
Apr10Extreme
May8Very high
Jun7High
Jul7High
Aug8Very high
Sep10Very high
Oct10Extreme
Nov13Extreme
Dec14Extreme

Air quality in Guapiaçu 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 Guapiaçu is worst in September — around 24 µg/m³ PM2.5 (moderate), about 3.1× the cleanest month (November, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1423 µg/m³Nov 228 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb9Good
Mar10Good
Apr10Good
May11Good
Jun10Good
Jul10Good
Aug19Moderate
Sep24Moderate
Oct16Moderate
Nov8Good
Dec8Good
Location & terrain

Where is Guapiaçu?

Guapiaçu sits at 20.8°S, 49.2°W, 508 m above sea level, in Brazil. The nearest listed city is São José do Rio Preto, 17 km away.

Topography around Guapiaçu

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

Within 3 km, the terrain around Guapiaçu has only modest variations in elevation — a maximum elevation change of 100 m around an average of 522 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 157 m; within 80 km, significant variations in elevation — a maximum elevation change of 288 m.

The land around Guapiaçu is covered by cropland (49%) and trees (21%) within 3 km, cropland (56%) and trees (22%) within 16 km, and cropland (63%) and trees (20%) within 80 km.

3 km
100 m
16 km
157 m
80 km
288 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: São José do Rio Preto 17 km · Bady Bassitt 27 km · Nova Granada 31 km · Mirassol 31 km · Potirendaba 32 km · Olímpia 32 km · Catanduva 46 km · Tanabi 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 Guapiaçu (-20.795°, -49.2203°, elevation 508 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).