Ascención de Guarayos weather in September

In September, Ascención de Guarayos sees average daytime highs of 31°C and overnight lows near 21°C, with 92 mm of rain across 9 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 47% of the time in September, and the air most often feels oppressive.

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 Ascención de Guarayos's 3rd-clearest and 1st-windiest month. For the whole year in context, see Ascención de Guarayos's year-round climate.

Daytime high
31°
2nd warmest
Overnight low
21°
5th coldest
Rainfall
92 mm
9 wet days
Daylight
11 h 54 min
6:10 AM – 6:04 PM
Cloud cover
49%
3rd clearest
Wind
10 km/h
1st windiest
Solar energy
5.49 kWh/m²
Travel score
4.5
out of 10

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 Ascención de Guarayos reaches about 31°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 25°C and 36°C. Set against its neighbours, September runs about 1°C warmer than August and on par with October.

10°20°30°40°151015202530
Avg high (°C)Avg low (°C)
13120
23120
33120
43120
53120
63120
73120
83120
93120
103120
113120
123120
133121
143121
153121
163121
173221
183221
193221
203221
213221
223221
233221
243221
253221
263221
273221
283221
293221
303222

How September really feels in Ascención de Guarayos

Once humidity and wind are folded in, September averages 21 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
21
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.

Ascención de Guarayos 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° / 23°29525.512.83.1
Feb30° / 23°24622.912.53.2
Mar30° / 23°18522.512.13.5
Apr29° / 21°10414.311.74.7
May27° / 19°7110.311.36.2
Jun27° / 18°537.111.17.0
Jul27° / 17°354.811.17.4
Aug30° / 18°455.111.55.9
Sep31° / 21°92911.94.5
Oct32° / 22°13915.112.43.7
Nov31° / 22°1931912.73.5
Dec30° / 23°24224.212.93.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 47% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 37%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17327
27327
37228
47228
57030
67030
77030
86931
96931
106832
116733
126733
136634
146535
156436
166436
176238
186238
196040
206040
215842
225842
235743
245644
255545
265347
275347
285248
295149
305149

Chance of precipitation in September

Any precipitation

Ascención de Guarayos gets around 92 mm of rain over 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 30% and peaks near 39% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
124
225
326
426
527
627
728
828
928
1028
1128
1228
1328
1429
1529
1629
1730
1830
1930
2031
2131
2232
2333
2434
2535
2636
2737
2838
2938
3039

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 36% of days. Sticky, muggy-or-worse air turns up on roughly 65% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
118101532250
218101532260
317101432270
417101431270
517101431280
616101431280
716101431290
816101431290
915101431300
1015101431300
1114101431310
121491431320
131391431330
141391431330
151391430340
161391430350
171281430350
181281430360
191281329370
201281329380
211181328390
221171328410
231071327430
24971326440
25971325460
26861325480
27861224490
28761223511
29761223511
30661223521

Wind in September

Winds average 10 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 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm

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 6:22 AM to 5:58 AM, and sunset from 6:03 PM to 6:06 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.76:226:03
211.76:216:03
311.76:206:03
411.76:206:03
511.76:196:03
611.86:186:04
711.86:176:04
811.86:166:04
911.86:156:04
1011.86:156:04
1111.86:146:04
1211.96:136:04
1311.96:126:04
1411.96:116:04
1511.96:116:04
1611.96:106:04
1711.96:096:05
1811.96:086:05
1912.06:076:05
2012.06:066:05
2112.06:066:05
2212.06:056:05
2312.06:046:05
2412.06:036:05
2512.06:026:05
2612.16:016:05
2712.16:016:05
2812.16:006:06
2912.15:596:06
3012.15:586:06

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.49 kWh/m².

For context, solar energy here swings from a low near 3.78 kWh/m² to a high of 5.6 kWh/m² in October across the year — September's 5.49 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.3Bright
55.3Bright
65.3Bright
75.4Bright
85.4Bright
95.4Bright
105.4Bright
115.4Bright
125.5Bright
135.5Bright
145.5Bright
155.5Bright
165.5Bright
175.5Bright
185.5Bright
195.5Bright
205.5Bright
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 Ascención de Guarayos

In seasonPeak

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

Ascención de Guarayos'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 Ascención de Guarayos?

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

4.5
Sightseeing
6th-best month of the year
6.8
Beach & pool
4th-best month of the year

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

What to pack for Ascención de Guarayos in September

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

In September, Ascención de Guarayos sees daytime highs around 31°C and nights near 21°C. Pack light clothes. Worth having: rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

UV index in Ascención de Guarayos 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 Ascención de Guarayos peaks around January 18 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near September 15 at about 7 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highVery highExtremeJan 18UV 15Sep 15UV 7
UV index (midday)Level
Jan16Extreme
Feb14Extreme
Mar14Extreme
Apr11Extreme
May9Very high
Jun8Very high
Jul8Very high
Aug8Very high
Sep7High
Oct8Very high
Nov13Extreme
Dec14Extreme

Air quality in Ascención de Guarayos 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 Ascención de Guarayos is worst in September — around 154 µg/m³ PM2.5 (very unhealthy), about 24.0× the cleanest month (May, 6 µg/m³).

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

0306090120150JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateUnhealthyModerateSep 16142 µg/m³May 137 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb11Good
Mar10Good
Apr7Good
May6Good
Jun8Good
Jul18Moderate
Aug60Unhealthy
Sep154Very unhealthy
Oct64Unhealthy
Nov22Moderate
Dec11Good
Location & terrain

Where is Ascención de Guarayos?

Ascención de Guarayos sits at 15.9°S, 63.2°W, 248 m above sea level, in Bolivia. The nearest listed city is Montero, 161 km away.

MonteroWarnesVilla YapacaníSanta CruzCotocaTrinidadEl TornoSan Ignacio de Velasco

Topography around Ascención de Guarayos

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

Within 3 km, the terrain around Ascención de Guarayos has only modest variations in elevation — a maximum elevation change of 76 m around an average of 220 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 217 m; within 80 km, large variations in elevation — a maximum elevation change of 700 m.

The land around Ascención de Guarayos is covered by grassland (44%) and trees (40%) within 3 km, trees (58%) and grassland (26%) within 16 km, and trees (71%) within 80 km.

3 km
76 m
16 km
217 m
80 km
700 m
treesshrubsgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Montero 161 km · Warnes 181 km · Villa Yapacaní 181 km · Santa Cruz 211 km · Cotoca 214 km · Trinidad 218 km · El Torno 235 km · San Ignacio de Velasco 244 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 Ascención de Guarayos (-15.893°, -63.1885°, elevation 248 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).