Jaú weather in September

In September, Jaú sees average daytime highs of 29°C and overnight lows near 17°C, with 64 mm of rain across 7.4 wet days and about 11.9 hours of daylight. It is the 7th-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 53% of the time in September, and the air most often feels dry.

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

Daytime high
29°
7th warmest
Overnight low
17°
5th coldest
Rainfall
64 mm
7.4 wet days
Daylight
11 h 54 min
7:12 AM – 7:05 PM
Cloud cover
43%
4th clearest
Wind
11 km/h
1st windiest
Solar energy
5.52 kWh/m²
Travel score
6.0
out of 10

Jaú is human settlement in Brazil.

Air quality
Good
PM10 25 µg/m³ · 2014

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 29°C through the month.

A typical September day in Jaú reaches about 29°C in the afternoon and slips back to 17°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 34°C. Set against its neighbours, September runs about 2°C warmer than August and on par with October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12916
22916
32916
42916
52916
62916
72916
82917
92917
102917
112917
122917
132917
142917
152917
162917
172917
182917
192917
202917
212917
222917
232917
242917
252917
262917
272917
282917
292918
302918

Jaú weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 21°24722.113.23.7
Feb30° / 21°1801912.83.7
Mar30° / 20°13917.412.24.4
Apr29° / 19°58811.56.2
May26° / 16°566.310.97.5
Jun25° / 14°374.110.78.0
Jul26° / 14°273.510.88.2
Aug28° / 15°293.611.27.6
Sep29° / 17°647.411.96.0
Oct30° / 19°11012.612.54.8
Nov30° / 19°15615.513.14.4
Dec30° / 21°19220.313.33.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 53% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 12% of September, with mostly cloudy or overcast conditions the remaining 35%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17723
27624
37525
47426
57327
67228
77030
87030
96931
106832
116733
126733
136634
146634
156535
166436
176436
186337
196337
206337
216139
226040
235941
245842
255743
265644
275545
285545
295446
305446

Chance of precipitation in September

Any precipitation

Jaú gets around 64 mm of rain over 7.4 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 24% and peaks near 34% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
116
217
317
418
518
619
719
819
920
1020
1121
1221
1322
1422
1523
1624
1724
1825
1926
2027
2128
2229
2330
2431
2532
2632
2733
2833
2934
3034

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 37% of days. Sticky, muggy-or-worse air turns up on roughly 7% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
15728141
25528152
35528152
45428162
55328172
65128183
75128183
84929193
94729203
104630214
114430224
124231224
134132235
143932245
153733255
163633266
173434266
183334276
193134287
203034298
212834298
222734309
2326333011
2425333112
2523323213
2622323214
2721313315
2821303316
2920303317
3019293418

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
110calm
210calm
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
2911calm
3011calm

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 7:27 AM to 6:58 AM, and sunset from 7:00 PM to 7:09 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.57:277:00
211.67:277:01
311.67:267:01
411.67:257:01
511.67:247:02
611.77:237:02
711.77:227:02
811.77:217:02
911.77:207:03
1011.77:197:03
1111.87:177:03
1211.87:167:04
1311.87:157:04
1411.87:147:04
1511.97:137:04
1611.97:127:05
1711.97:117:05
1811.97:107:05
1911.97:097:06
2012.07:087:06
2112.07:077:06
2212.07:067:07
2312.07:057:07
2412.07:047:07
2512.17:037:07
2612.17:027:08
2712.17:017:08
2812.17:007:08
2912.26:597:09
3012.26:587:09

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.52 kWh/m².

For context, solar energy here swings from a low near 3.71 kWh/m² to a high of 6.01 kWh/m² in November across the year — September's 5.52 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.3Bright
55.4Bright
65.4Bright
75.4Bright
85.4Bright
95.4Bright
105.5Bright
115.5Bright
125.5Bright
135.5Bright
145.5Bright
155.5Bright
165.5Bright
175.5Bright
185.6Bright
195.6Bright
205.6Bright
215.6Bright
225.6Bright
235.6Bright
245.6Bright
255.6Bright
265.6Bright
275.6Bright
285.7Bright
295.7Bright
305.7Bright
Planning a trip in September

Hazard calendar for Jaú

In seasonPeak

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

Jaú's rainy season runs November–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 Jaú?

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

6.0
Sightseeing
6th-best month of the year
7.7
Beach & pool
2nd-best month of the year

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

What to pack for Jaú in September

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

In September, Jaú sees daytime highs around 29°C and nights near 17°C. Pack light clothes. Worth having: sun protection. About 7 days see rain.

light clothessun protection

UV index in Jaú in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Jaú peaks around January 22 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 22UV 15Jul 11UV 6
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar13Extreme
Apr10Very high
May7High
Jun6High
Jul6High
Aug8Very high
Sep9Very high
Oct11Extreme
Nov13Extreme
Dec14Extreme

Air quality in Jaú 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 Jaú is worst in September — around 22 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (November, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1022 µg/m³Nov 239 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb10Good
Mar10Good
Apr11Good
May13Moderate
Jun14Moderate
Jul14Moderate
Aug22Moderate
Sep22Moderate
Oct17Moderate
Nov9Good
Dec9Good
Location & terrain

Where is Jaú?

Jaú sits at 22.3°S, 48.6°W, 528 m above sea level, in Brazil. The nearest listed city is Dois Córregos, 20 km away.

Topography around Jaú

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

Within 3 km, the terrain around Jaú has only modest variations in elevation — a maximum elevation change of 143 m around an average of 549 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 319 m; within 80 km, large variations in elevation — a maximum elevation change of 700 m.

The land around Jaú is covered by artificial surfaces (53%) within 3 km, cropland (70%) within 16 km, and cropland (50%) and trees (35%) within 80 km.

3 km
143 m
16 km
319 m
80 km
700 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Dois Córregos 20 km · Barra Bonita 22 km · Pederneiras 23 km · Igaraçu do Tietê 24 km · Macatuba 28 km · Bariri 31 km · Lençóis Paulista 42 km · Brotas 44 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 Jaú (-22.2964°, -48.5578°, elevation 528 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).