Monte Llano weather in September

In September, Monte Llano sees average daytime highs of 29°C and overnight lows near 25°C, with 64 mm of rain across 13.5 wet days and about 12.1 hours of daylight. It is the 1st-warmest and 8th-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 39% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 24 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Monte Llano's 11th-clearest and 10th-windiest month. For the whole year in context, see Monte Llano's year-round climate.

Daytime high
29°
1st warmest
Overnight low
25°
12th coldest
Rainfall
64 mm
13.5 wet days
Daylight
12 h 06 min
6:33 AM – 6:40 PM
Cloud cover
55%
11th clearest
Wind
17 km/h
10th windiest
Solar energy
6.1 kWh/m²
Travel score
5.3
out of 10

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 Monte Llano reaches about 29°C in the afternoon and slips back to 25°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 30°C. Set against its neighbours, September runs on par with August and on par with October.

20°23°25°28°30°151015202530
Avg high (°C)Avg low (°C)
12925
22925
32925
42925
52925
62925
72925
82925
92925
102925
112925
122925
132925
142925
152925
162925
172925
182925
192925
202925
212925
222925
232925
242925
252925
262925
272925
282925
292925
302825

How September really feels in Monte Llano

Once humidity and wind are folded in, September averages 17 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
17
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.

Monte Llano 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
Jan25° / 22°9714.610.96.5
Feb25° / 22°6312.111.36.8
Mar25° / 22°7611.511.97.0
Apr26° / 23°7212.912.46.6
May27° / 24°7113.212.96.1
Jun28° / 25°276.813.26.4
Jul28° / 25°379.513.16.2
Aug28° / 25°4410.212.75.8
Sep29° / 25°6413.512.15.3
Oct28° / 25°8516.111.55.4
Nov27° / 24°12118.211.15.5
Dec26° / 23°941610.86.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 39% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 45%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15545
25545
35545
45545
55545
65545
75545
85545
95545
105545
115644
125644
135644
145545
155644
165644
175644
185644
195644
205644
215644
225545
235545
245545
255446
265545
275446
285446
295446
305446

Chance of precipitation in September

Any precipitation

Monte Llano gets around 64 mm of rain over 13.5 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 44% and peaks near 48% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
139
240
340
440
540
640
741
841
941
1042
1142
1242
1342
1443
1544
1644
1745
1846
1947
2047
2148
2248
2348
2448
2548
2648
2748
2848
2948
3048

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 87% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
18218
28218
38317
48317
58317
68317
78416
88416
98416
108515
118515
128515
138614
148614
158713
168713
178713
188812
198812
208812
218911
228911
238911
249010
259010
269010
27919
28919
29919
30919

Wind in September

Winds average 17 km/h in September.

Across September, daily wind ranges from about 16 km/h on the calmest days to 18 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
118light breeze
218light breeze
317light breeze
417light breeze
517light breeze
617light breeze
717light breeze
817light breeze
917light breeze
1017light breeze
1117light breeze
1217light breeze
1317light breeze
1417light breeze
1517light breeze
1617light breeze
1717light breeze
1816light breeze
1916light breeze
2016light breeze
2116light breeze
2216light breeze
2316light breeze
2416light breeze
2516light breeze
2616light breeze
2716light breeze
2816light breeze
2916light breeze
3016light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 24 min at the start of September to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 36 minutes over September. Sunrise moves from 6:30 AM to 6:36 AM, and sunset from 6:54 PM to 6:27 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:306:54
212.46:306:53
312.46:316:52
412.36:316:51
512.36:316:50
612.36:316:49
712.36:326:49
812.36:326:48
912.26:326:47
1012.26:326:46
1112.26:326:45
1212.26:336:44
1312.26:336:43
1412.16:336:42
1512.16:336:41
1612.16:336:40
1712.16:346:39
1812.16:346:38
1912.16:346:37
2012.06:346:36
2112.06:346:35
2212.06:356:34
2312.06:356:33
2412.06:356:32
2511.96:356:32
2611.96:366:31
2711.96:366:30
2811.96:366:29
2911.96:366:28
3011.86:366:27

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.1 kWh/m².

For context, solar energy here swings from a low near 4.05 kWh/m² to a high of 6.83 kWh/m² in June across the year — September's 6.1 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.3Intense
26.3Intense
36.3Intense
46.3Intense
56.3Intense
66.3Intense
76.3Intense
86.3Intense
96.2Intense
106.2Intense
116.2Intense
126.2Intense
136.2Intense
146.1Intense
156.1Intense
166.1Intense
176.1Intense
186.0Intense
196.0Intense
206.0Bright
216.0Bright
225.9Bright
235.9Bright
245.9Bright
255.9Bright
265.8Bright
275.8Bright
285.8Bright
295.8Bright
305.7Bright
Planning a trip in September

Hazard calendar for Monte Llano

In seasonPeak

In September, Monte Llano sits inside its atlantic hurricane season. The full year is below, with each hazard's peak months called out.

Monte Llano sits in the Atlantic hurricane belt; the season peaks August–October.

Atlantic hurricane
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Monte Llano?

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

5.3
Sightseeing
12th-best month of the year
6.5
Beach & pool
5th-best month of the year

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

What to pack for Monte Llano in September

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

In September, Monte Llano sees daytime highs around 29°C and nights near 25°C. Pack light clothes and sun protection. Worth having: rain gear. About 14 days see rain.

light clothessun protectionrain gear

Sea temperature near Monte Llano in September

The nearest coast averages about 29°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 16 km away) is warmest in September at about 29°C and coldest in February near 26°C.

The water stays above 20°C all year — warm enough for a swim any month.

24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan26Warm
Feb26Warm
Mar26Warm
Apr26Warm
May27Warm
Jun28Warm
Jul28Tropical
Aug28Tropical
Sep29Tropical
Oct29Tropical
Nov28Tropical
Dec27Warm

UV index in Monte Llano in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Monte Llano peaks around March 23 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 7 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highHighMar 23UV 12Dec 15UV 7
UV index (midday)Level
Jan8Very high
Feb10Very high
Mar12Extreme
Apr12Extreme
May12Extreme
Jun12Extreme
Jul12Extreme
Aug11Extreme
Sep11Extreme
Oct10Very high
Nov7Very high
Dec7High

Air quality in Monte Llano 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 Monte Llano is worst in June — around 30 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (February, 16 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateJun 2030 µg/m³Feb 2016 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb16Moderate
Mar16Moderate
Apr18Moderate
May23Moderate
Jun30Moderate
Jul28Moderate
Aug25Moderate
Sep26Moderate
Oct27Moderate
Nov20Moderate
Dec17Moderate
Location & terrain

Where is Monte Llano?

Monte Llano sits at 19.7°N, 70.6°W, 12 m above sea level, in Dominican Republic. The nearest listed city is Sosua, 9.0 km away.

TamborilSantiago de los CaballerosVilla BisonóMoca

Topography around Monte Llano

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

Within 3 km, the terrain around Monte Llano has only modest variations in elevation — a maximum elevation change of 120 m around an average of 22 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 940 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,368 m.

The land around Monte Llano is covered by trees (52%) and grassland (36%) within 3 km, trees (51%) and water (31%) within 16 km, and trees (44%) and water (35%) within 80 km.

3 km
120 m
16 km
940 m
80 km
2,368 m
treesshrubsgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Sosua 9.0 km · Puerto Plata 11 km · Río Grande 19 km · Cabarete 20 km · Tamboril 28 km · Santiago de los Caballeros 33 km · Villa Bisonó 35 km · Moca 39 km

Dominican Republic travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / B / C
120 V · 60 Hz
Prices
≈ 39% of US
price level, 2025
GDP per capita
$11,059
2025
Happiness
6.1 / 10
World Happiness, 2025
Safe drinking water
45%
of population, 2024
Homicide rate
10.9
per 100k, 2023
Road deaths
64.6
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Moderate
EF EPI 503

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 Monte Llano (19.7346°, -70.5991°, elevation 12 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).