Montalvo weather in September

In September, Montalvo sees average daytime highs of 23°C and overnight lows near 17°C, with 586 mm of rain across 29.6 wet days and about 12 hours of daylight. It is the 10th-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 23°C through the month. The sky is clear or mostly clear about 0% of the time in September, and the air most often feels humid.

Daylight stretches from about 12 hours at the start of September to 12 hours by month's end. Set against the rest of the year, September is Montalvo's 4th-clearest and 2nd-windiest month. For the whole year in context, see Montalvo's year-round climate.

Daytime high
23°
10th warmest
Overnight low
17°
2nd coldest
Rainfall
586 mm
29.6 wet days
Daylight
12 hours
6:12 AM – 6:11 PM
Cloud cover
88%
4th clearest
Wind
4 km/h
2nd windiest
Solar energy
4.24 kWh/m²
Travel score
3.5
out of 10

Montalvo is Town and urban parish of Los Ríos Province, Ecuador.

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 23°C through the month.

A typical September day in Montalvo reaches about 23°C in the afternoon and slips back to 17°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 25°C. Set against its neighbours, September runs on par with August and on par with October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12317
22317
32317
42317
52317
62317
72317
82317
92317
102317
112317
122317
132317
142317
152317
162317
172317
182317
192317
202317
212317
222417
232417
242417
252417
262417
272417
282417
292418
302418

Montalvo weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan24° / 19°110730.612.13.5
Feb25° / 19°10622812.13.4
Mar25° / 19°110730.7123.4
Apr25° / 19°110129.4123.4
May25° / 19°107830.611.93.5
Jun24° / 18°73929.811.93.5
Jul23° / 17°65630.511.93.5
Aug23° / 17°50630.411.93.6
Sep23° / 17°58629.6123.5
Oct24° / 18°47028.2123.8
Nov24° / 18°38425.912.14.0
Dec24° / 19°73029.412.13.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 0% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 4% of September, with mostly cloudy or overcast conditions the remaining 96%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1793
2793
3793
4793
5793
6793
7793
8793
9793
10694
11694
12694
13496
14496
15496
16397
17397
18397
19397
20298
21298
22298
23298
24298
25298
26298
27298
28298
29298
30199

Chance of precipitation in September

Any precipitation

Montalvo gets around 586 mm of rain over 29.6 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 99% and peaks near 99% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
198
298
398
498
598
698
798
898
999
1099
1199
1299
1399
1499
1599
1699
1799
1899
1999
2099
2199
2299
2399
2499
2598
2698
2798
2898
2998
3098

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the humid band about 54% of days. Sticky, muggy-or-worse air turns up on roughly 46% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)
17030
26931
36931
46832
56733
66634
76535
86436
96337
106238
116139
125941
135842
145644
155446
165347
175149
185050
194852
204753
214654
224456
234357
244357
254258
264159
274159
284060
294060
304060

Wind in September

Winds average 4 km/h in September.

Across September, daily wind ranges from about 4 km/h on the calmest days to 4 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 hours at the start of September to 12 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 0 minutes over September. Sunrise moves from 6:18 AM to 6:06 AM, and sunset from 6:16 PM to 6:07 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.06:186:16
212.06:186:16
312.06:176:15
412.06:176:15
512.06:166:15
612.06:166:14
712.06:166:14
812.06:156:14
912.06:156:13
1012.06:146:13
1112.06:146:13
1212.06:136:12
1312.06:136:12
1412.06:136:12
1512.06:126:12
1612.06:126:11
1712.06:116:11
1812.06:116:11
1912.06:106:10
2012.06:106:10
2112.06:106:10
2212.06:096:09
2312.06:096:09
2412.06:086:09
2512.06:086:08
2612.06:086:08
2712.06:076:08
2812.06:076:07
2912.06:066:07
3012.06:066:07

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.24 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 3.5 kWh/m² to a high of 4.24 kWh/m² in September across the year — September's 4.24 kWh/m² sits near the top of that range.

012345151015202530
Solar energy (kWh/m²)Level
14.3Bright
24.3Bright
34.3Bright
44.3Bright
54.3Bright
64.3Bright
74.3Bright
84.3Bright
94.3Bright
104.3Bright
114.3Bright
124.3Bright
134.3Bright
144.3Bright
154.3Bright
164.3Bright
174.3Bright
184.2Bright
194.2Bright
204.2Bright
214.2Bright
224.2Bright
234.2Bright
244.2Bright
254.2Bright
264.2Bright
274.2Bright
284.1Bright
294.1Bright
304.1Bright
Planning a trip in September

Is September a good time to visit Montalvo?

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

3.5
Sightseeing
5th-best month of the year
2.8
Beach & pool
10th-best month of the year

September is a weaker month for outdoor sightseeing in Montalvo.

What to pack for Montalvo in September

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

In September, Montalvo sees daytime highs around 23°C and nights near 17°C. Pack rain gear. Worth having: light clothes. About 30 days see rain.

rain gearlight clothes

UV index in Montalvo in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Montalvo peaks around March 10 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 19 at about 11 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 10UV 16Jul 19UV 11
UV index (midday)Level
Jan15Extreme
Feb16Extreme
Mar16Extreme
Apr14Extreme
May14Extreme
Jun12Extreme
Jul11Extreme
Aug11Extreme
Sep12Extreme
Oct14Extreme
Nov12Extreme
Dec12Extreme

Air quality in Montalvo 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 Montalvo is worst in November — around 47 µg/m³ PM2.5 (poor), about 2.4× the cleanest month (January, 20 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorNov 1745 µg/m³Jan 2420 µg/m³
PM2.5 (µg/m³)Level
Jan20Moderate
Feb20Moderate
Mar22Moderate
Apr23Moderate
May21Moderate
Jun21Moderate
Jul21Moderate
Aug21Moderate
Sep23Moderate
Oct27Moderate
Nov47Poor
Dec30Moderate
Location & terrain

Where is Montalvo?

Montalvo sits at 1.8°S, 79.3°W, 65 m above sea level, in Ecuador. The nearest listed city is Babahoyo, 26 km away.

Topography around Montalvo

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

Within 3 km, the terrain around Montalvo has only modest variations in elevation — a maximum elevation change of 155 m around an average of 75 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 2,468 m; within 80 km, extreme variations in elevation — a maximum elevation change of 6,245 m.

The land around Montalvo is covered by trees (69%) within 3 km, trees (60%) and grassland (22%) within 16 km, and trees (38%) and grassland (34%) within 80 km.

3 km
155 m
16 km
2,468 m
80 km
6,245 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Babahoyo 26 km · Guaranda 39 km · Ventanas 43 km · Naranjito 47 km · Milagro 51 km · Samborondón 52 km · Yaguachi Nuevo 57 km · Vinces 58 km

Ecuador travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 43% of US
price level, 2025
GDP per capita
$7,125
2025
Happiness
6.1 / 10
World Happiness, 2025
Safe drinking water
70%
of population, 2024
Homicide rate
45.7
per 100k, 2023
Road deaths
20.1
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 466
Religion
Roman Catholic 68%Protestant 19%none 8%other 2%

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 Montalvo (-1.7901°, -79.2876°, elevation 65 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).