Cobija weather in September

In September, Cobija sees average daytime highs of 33°C and overnight lows near 21°C, with 96 mm of rain across 13.8 wet days and about 11.9 hours of daylight. It is the 1st-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 33°C through the month. The sky is clear or mostly clear about 32% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 11 h 48 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Cobija's 4th-clearest and 3rd-windiest month. For the whole year in context, see Cobija's year-round climate.

Daytime high
33°
1st warmest
Overnight low
21°
5th coldest
Rainfall
96 mm
13.8 wet days
Daylight
11 h 54 min
6:31 AM – 6:28 PM
Cloud cover
58%
4th clearest
Wind
7 km/h
3rd windiest
Solar energy
5.53 kWh/m²
Travel score
3.3
out of 10

Cobija is city and municipality of Bolivia.

Density
66/km²
people per km²
Founded
1906

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 33°C through the month.

A typical September day in Cobija reaches about 33°C in the afternoon and slips back to 21°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 36°C. Set against its neighbours, September runs on par with August and about 1°C warmer than October.

15°20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13321
23321
33321
43321
53321
63321
73321
83321
93321
103321
113321
123321
133321
143321
153321
163322
173322
183322
193322
203322
213322
223322
233322
243322
253322
263322
273322
283322
293222
303222

How September really feels in Cobija

Once humidity and wind are folded in, September averages 30 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
30
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Cobija weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 23°26326.712.62.9
Feb30° / 22°26524.712.42.9
Mar30° / 22°25526.212.13.0
Apr30° / 22°15320.311.83.6
May29° / 21°771411.54.7
Jun30° / 20°377.411.45.5
Jul31° / 19°285.711.45.4
Aug32° / 20°447.211.64.2
Sep33° / 21°9613.811.93.3
Oct32° / 22°17120.612.23.0
Nov31° / 22°22022.212.53.0
Dec30° / 23°25725.512.62.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 22% of September, with mostly cloudy or overcast conditions the remaining 46%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16832
26733
36634
46535
56436
66337
76238
86139
96139
106040
115941
125842
135743
145644
155545
165446
175248
185149
195149
204951
214852
224852
234654
244555
254555
264456
274357
284159
294159
304060

Chance of precipitation in September

Any precipitation

Cobija gets around 96 mm of rain over 13.8 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 46% and peaks near 58% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
135
236
336
437
538
638
739
840
940
1041
1142
1242
1343
1444
1545
1646
1747
1848
1949
2050
2151
2252
2352
2453
2554
2655
2756
2856
2957
3058

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the oppressive band about 68% of days. Sticky, muggy-or-worse air turns up on roughly 89% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1361026550
236925570
335925580
435924590
535924590
625824610
725824610
824824620
924824620
1024723640
1124723640
1223723650
1323622670
1423622670
1523621680
1623621680
1722620700
1822520710
1922519711
2022518721
2122518721
2222517731
2312417751
2412416761
2512416752
2612415762
2712414772
2812314773
2912313783
3012313783

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 7 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 48 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 18 minutes over September. Sunrise moves from 6:41 AM to 6:22 AM, and sunset from 6:28 PM to 6:27 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.86:416:28
211.86:416:28
311.86:406:28
411.86:396:28
511.86:396:28
611.86:386:28
711.86:376:28
811.96:376:28
911.96:366:28
1011.96:356:28
1111.96:356:28
1211.96:346:28
1311.96:336:28
1411.96:336:28
1511.96:326:28
1611.96:316:28
1712.06:316:28
1812.06:306:27
1912.06:296:27
2012.06:286:27
2112.06:286:27
2212.06:276:27
2312.06:266:27
2412.06:266:27
2512.06:256:27
2612.06:246:27
2712.16:246:27
2812.16:236:27
2912.16:226:27
3012.16:226:27

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.53 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.29 kWh/m² to a high of 5.53 kWh/m² in September across the year — September's 5.53 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.4Bright
25.4Bright
35.5Bright
45.5Bright
55.5Bright
65.5Bright
75.5Bright
85.5Bright
95.5Bright
105.5Bright
115.5Bright
125.5Bright
135.5Bright
145.5Bright
155.5Bright
165.5Bright
175.5Bright
185.5Bright
195.5Bright
205.6Bright
215.6Bright
225.6Bright
235.6Bright
245.6Bright
255.6Bright
265.6Bright
275.6Bright
285.6Bright
295.6Bright
305.6Bright
Planning a trip in September

Hazard calendar for Cobija

In seasonPeak

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

Cobija's rainy season runs October–April, 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 Cobija?

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

3.3
Sightseeing
6th-best month of the year
5.7
Beach & pool
5th-best month of the year

September is a weaker month for outdoor sightseeing in Cobija.

What to pack for Cobija in September

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

In September, Cobija sees daytime highs around 33°C and nights near 21°C. Pack light clothes and rain gear. Worth having: sun protection. About 14 days see rain.

light clothesrain gearsun protection

UV index in Cobija in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Cobija peaks around February 10 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near September 12 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeFeb 10UV 15Sep 12UV 6
UV index (midday)Level
Jan15Extreme
Feb15Extreme
Mar15Extreme
Apr12Extreme
May11Extreme
Jun9Very high
Jul8Very high
Aug8Very high
Sep6High
Oct12Extreme
Nov13Extreme
Dec14Extreme

Air quality in Cobija 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 Cobija is worst in September — around 65 µg/m³ PM2.5 (unhealthy), about 9.7× the cleanest month (June, 7 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodModerateModerateGoodSep 1661 µg/m³Jun 127 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb13Moderate
Mar12Moderate
Apr10Good
May7Good
Jun7Good
Jul9Good
Aug28Moderate
Sep65Unhealthy
Oct26Moderate
Nov13Moderate
Dec10Good
Location & terrain

Where is Cobija?

Cobija sits at 11.0°S, 68.8°W, 200 m above sea level, in Bolivia. The nearest listed city is Brasiléia, 3.0 km away.

Senador GuiomardRio BrancoPuerto MaldonadoPlácido de CastroTambopata

Topography around Cobija

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

Within 3 km, the terrain around Cobija has only modest variations in elevation — a maximum elevation change of 72 m around an average of 209 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 131 m; within 80 km, only modest variations in elevation — a maximum elevation change of 234 m.

The land around Cobija is covered by trees (47%), artificial surfaces (30%) and grassland (20%) within 3 km, grassland (50%) and trees (48%) within 16 km, and trees (84%) within 80 km.

3 km
72 m
16 km
131 m
80 km
234 m
treesgrasslandartificial surfacesbare terrainwater
September weather nearby: Brasiléia 3.0 km · Epitaciolândia 3.0 km · Xapuri 51 km · Senador Guiomard 149 km · Rio Branco 157 km · Puerto Maldonado 180 km · Plácido de Castro 189 km · Tambopata 194 km

Bolivia travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / B / C
230 V · 50 Hz
Prices
≈ 40% of US
price level, 2025
GDP per capita
$5,148
2025
Happiness
5.8 / 10
World Happiness, 2025
Homicide rate
4.4
per 100k, 2023
Road deaths
21.1
per 100k/yr, 2019
Income group
Lower middle
World Bank
English
Moderate
EF EPI 521
Religion
Roman Catholic 65%Protestant 20%none 6%other 5%

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 Cobija (-11.0267°, -68.7692°, elevation 200 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).