San Ignacio de Velasco weather in September

In September, San Ignacio de Velasco sees average daytime highs of 31°C and overnight lows near 20°C, with 47 mm of rain across 7.1 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 48% of the time in September, and the air most often feels muggy.

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 San Ignacio de Velasco's 4th-clearest and 2nd-windiest month. For the whole year in context, see San Ignacio de Velasco's year-round climate.

Daytime high
31°
2nd warmest
Overnight low
20°
5th coldest
Rainfall
47 mm
7.1 wet days
Daylight
11 h 54 min
6:01 AM – 5:55 PM
Cloud cover
48%
4th clearest
Wind
11 km/h
2nd windiest
Solar energy
5.49 kWh/m²
Travel score
4.7
out of 10

San Ignacio de Velasco is city in Bolivia.

Founded
1748

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 San Ignacio de Velasco reaches about 31°C in the afternoon and slips back to 20°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 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)
13119
23119
33119
43119
53119
63119
73119
83119
93120
103120
113120
123120
133120
143120
153120
163220
173220
183220
193220
203220
213220
223220
233220
243220
253220
263221
273221
283221
293221
303221

How September really feels in San Ignacio de Velasco

Once humidity and wind are folded in, September averages 12 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
12
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.

San Ignacio de Velasco 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°16922.412.93.5
Feb29° / 22°17421.512.63.5
Mar29° / 21°14720.112.13.9
Apr29° / 20°6912.211.65.2
May27° / 18°437.911.26.8
Jun27° / 17°233.9117.6
Jul28° / 16°182.911.17.7
Aug30° / 18°213.311.56.0
Sep31° / 20°477.111.94.7
Oct32° / 21°8613.412.43.8
Nov31° / 21°12016.112.83.9
Dec30° / 22°15119.9133.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 48% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 33%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17723
27723
37624
47525
57525
67327
77327
87228
97129
107129
117129
127030
137030
146832
156832
166733
176733
186535
196535
206436
216436
226337
236139
246040
256040
265941
275842
285743
295644
305545

Chance of precipitation in September

Any precipitation

San Ignacio de Velasco gets around 47 mm of rain over 7.1 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 32% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
117
218
318
419
519
620
720
821
921
1021
1121
1221
1322
1422
1523
1623
1723
1824
1924
2025
2125
2226
2326
2427
2528
2629
2730
2831
2931
3032

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 45% of days. Sticky, muggy-or-worse air turns up on roughly 51% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1211827331
2201827341
3191826352
4191826362
5181825372
6181725382
7171725392
8161725402
9161724412
10151624423
11151624433
12141524443
13141524453
14131423464
15131323464
16131323474
17131223485
18131122486
19121122496
20121022497
21121021498
22111021499
23119215010
24109205011
25109205012
2698195113
2788195114
2888185115
2977185216
3077175217

Wind in September

Winds average 11 km/h in September.

Across September, daily wind ranges from about 11 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
2911calm
3011calm

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 6:13 AM to 5:49 AM, and sunset from 5:54 PM to 5:57 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.76:135:54
211.76:125:54
311.76:125:54
411.76:115:54
511.76:105:54
611.86:095:54
711.86:085:55
811.86:085:55
911.86:075:55
1011.86:065:55
1111.86:055:55
1211.86:045:55
1311.96:035:55
1411.96:035:55
1511.96:025:55
1611.96:015:55
1711.96:005:56
1811.95:595:56
1912.05:585:56
2012.05:585:56
2112.05:575:56
2212.05:565:56
2312.05:555:56
2412.05:545:56
2512.15:535:56
2612.15:535:57
2712.15:525:57
2812.15:515:57
2912.15:505:57
3012.15:495:57

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 3.88 kWh/m² to a high of 5.75 kWh/m² in October across the year — September's 5.49 kWh/m² falls in the middle.

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
185.6Bright
195.6Bright
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 San Ignacio de Velasco

In seasonPeak

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

San Ignacio de Velasco'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 San Ignacio de Velasco?

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

4.7
Sightseeing
6th-best month of the year
7.1
Beach & pool
4th-best month of the year

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

What to pack for San Ignacio de Velasco in September

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

In September, San Ignacio de Velasco sees daytime highs around 31°C and nights near 20°C. Pack light clothes. Worth having: sun protection. About 7 days see rain.

light clothessun protection

UV index in San Ignacio de Velasco in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in San Ignacio de Velasco peaks around January 18 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near September 14 at about 5 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighExtremeJan 18UV 16Sep 14UV 5
UV index (midday)Level
Jan16Extreme
Feb15Extreme
Mar14Extreme
Apr11Extreme
May9Very high
Jun7Very high
Jul8Very high
Aug8Very high
Sep4Moderate
Oct11Extreme
Nov13Extreme
Dec14Extreme

Air quality in San Ignacio de Velasco 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 San Ignacio de Velasco is worst in September — around 91 µg/m³ PM2.5 (unhealthy), about 12.7× the cleanest month (April, 7 µg/m³).

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

0306090JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateUnhealthyPoorModerateSep 1586 µg/m³Apr 148 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb10Good
Mar9Good
Apr7Good
May11Good
Jun20Moderate
Jul27Moderate
Aug55Poor
Sep91Unhealthy
Oct43Poor
Nov36Poor
Dec15Moderate
Location & terrain

Where is San Ignacio de Velasco?

San Ignacio de Velasco sits at 16.4°S, 61.0°W, 582 m above sea level, in Bolivia. The nearest listed city is Vila Bela da Santíssima Trindade, 187 km away.

Vila Bela da Santíssima TrindadePontes e LacerdaAscención de GuarayosMonteroWarnesCotocaSanta CruzSão José dos Quatro Marcos

Topography around San Ignacio de Velasco

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of San Ignacio de Velasco.

Within 3 km, the terrain around San Ignacio de Velasco has only modest variations in elevation — a maximum elevation change of 96 m around an average of 408 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 270 m; within 80 km, significant variations in elevation — a maximum elevation change of 508 m.

The land around San Ignacio de Velasco is covered by trees (49%) and grassland (21%) within 3 km, trees (73%) and grassland (21%) within 16 km, and trees (79%) within 80 km.

3 km
96 m
16 km
270 m
80 km
508 m
treesshrubsgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Vila Bela da Santíssima Trindade 187 km · Pontes e Lacerda 216 km · Ascención de Guarayos 244 km · Montero 266 km · Warnes 266 km · Cotoca 273 km · Santa Cruz 283 km · São José dos Quatro Marcos 310 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 San Ignacio de Velasco (-16.3777°, -60.9647°, elevation 582 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).