Bonao weather in September

In September, Bonao sees average daytime highs of 27°C and overnight lows near 19°C, with 149 mm of rain across 21.9 wet days and about 12.1 hours of daylight. It is the 1st-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 27°C through the month. The sky is clear or mostly clear about 20% of the time in September, and the air most often feels muggy.

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 Bonao's 10th-clearest and 8th-windiest month. For the whole year in context, see Bonao's year-round climate.

Daytime high
27°
1st warmest
Overnight low
19°
11th coldest
Rainfall
149 mm
21.9 wet days
Daylight
12 h 06 min
6:33 AM – 6:39 PM
Cloud cover
65%
10th clearest
Wind
5 km/h
8th windiest
Solar energy
5.55 kWh/m²
Travel score
4.7
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 27°C through the month.

A typical September day in Bonao reaches about 27°C in the afternoon and slips back to 19°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 28°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)
12719
22719
32719
42719
52719
62719
72719
82719
92719
102719
112719
122719
132719
142719
152719
162719
172719
182719
192719
202719
212719
222719
232719
242719
252719
262719
272719
282719
292719
302719

Bonao weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan23° / 15°7514.1116.5
Feb23° / 15°7012.711.46.5
Mar24° / 16°11515.411.96.3
Apr25° / 17°17019.512.45.5
May26° / 18°25323.212.94.7
Jun27° / 19°13219.913.15.0
Jul27° / 19°10521135.0
Aug27° / 19°12521.812.64.8
Sep27° / 19°14921.912.14.7
Oct26° / 19°13320.311.65.1
Nov25° / 17°11517.411.15.7
Dec24° / 16°7313.510.96.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 20% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 24% of September, with mostly cloudy or overcast conditions the remaining 56%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14456
24555
34555
44555
54654
64654
74555
84456
94456
104456
114456
124456
134456
144555
154555
164456
174456
184456
194357
204456
214456
224357
234357
244357
254357
264258
274357
284258
294357
304357

Chance of precipitation in September

Any precipitation

Bonao gets around 149 mm of rain over 21.9 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 73% and peaks near 76% on the wettest days.

0%20%40%60%80%151015202530
Rain chance (%)
172
272
371
471
571
670
770
870
970
1070
1170
1271
1371
1472
1572
1673
1774
1875
1975
2076
2176
2276
2376
2476
2575
2675
2774
2873
2972
3071

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 91% of days. Sticky, muggy-or-worse air turns up on roughly 93% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)
17912
27912
36922
46922
56922
66922
76922
86922
96922
106922
116931
127921
137921
147921
157921
167921
177921
187921
198911
208911
218911
228911
238911
249901
259910
269910
279910
289910
299910
309910

Wind in September

Winds average 5 km/h in September.

Across September, daily wind ranges from about 5 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
16calm
26calm
36calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

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 6:53 PM to 6:26 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:306:53
212.46:306:52
312.36:306:51
412.36:316:50
512.36:316:49
612.36:316:48
712.36:316:47
812.36:316:46
912.26:326:46
1012.26:326:45
1112.26:326:44
1212.26:326:43
1312.26:326:42
1412.16:326:41
1512.16:336:40
1612.16:336:39
1712.16:336:38
1812.16:336:37
1912.16:336:36
2012.06:346:35
2112.06:346:35
2212.06:346:34
2312.06:346:33
2412.06:346:32
2511.96:346:31
2611.96:356:30
2711.96:356:29
2811.96:356:28
2911.96:356:27
3011.86:366:26

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.55 kWh/m².

For context, solar energy here swings from a low near 3.95 kWh/m² to a high of 6.16 kWh/m² in July across the year — September's 5.55 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.7Bright
45.7Bright
55.7Bright
65.7Bright
75.7Bright
85.7Bright
95.7Bright
105.7Bright
115.7Bright
125.6Bright
135.6Bright
145.6Bright
155.6Bright
165.5Bright
175.5Bright
185.5Bright
195.5Bright
205.4Bright
215.4Bright
225.4Bright
235.4Bright
245.3Bright
255.3Bright
265.3Bright
275.3Bright
285.3Bright
295.2Bright
305.2Bright
Planning a trip in September

Is September a good time to visit Bonao?

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

4.7
Sightseeing
11th-best month of the year
4.7
Beach & pool
11th-best month of the year

September is a reasonable time to visit Bonao for sightseeing.

What to pack for Bonao in September

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

In September, Bonao sees daytime highs around 27°C and nights near 19°C. Pack rain gear. Worth having: light clothes and sun protection. About 22 days see rain.

rain gearlight clothessun protection

Sea temperature near Bonao 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 67 km away) is warmest in September at about 29°C and coldest in February near 27°C.

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

26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan27Warm
Feb27Warm
Mar27Warm
Apr27Warm
May28Warm
Jun28Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec28Warm

UV index in Bonao 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 Bonao peaks around March 22 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 7 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highMar 22UV 13Dec 15UV 7
UV index (midday)Level
Jan8Very high
Feb11Extreme
Mar13Extreme
Apr13Extreme
May12Extreme
Jun12Extreme
Jul12Extreme
Aug13Extreme
Sep12Extreme
Oct10Extreme
Nov8Very high
Dec7High

Air quality in Bonao 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 Bonao is worst in June — around 31 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (February, 17 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateJun 2131 µg/m³Feb 1417 µg/m³
PM2.5 (µg/m³)Level
Jan18Moderate
Feb17Moderate
Mar18Moderate
Apr18Moderate
May23Moderate
Jun31Moderate
Jul29Moderate
Aug26Moderate
Sep25Moderate
Oct26Moderate
Nov21Moderate
Dec18Moderate
Location & terrain

Where is Bonao?

Bonao sits at 18.9°N, 70.4°W, 166 m above sea level, in Dominican Republic. The nearest listed city is Cotuí, 30 km away.

CotuíJarabacoaLa VegaConstanzaVilla AltagraciaSan Francisco de MacorísSan José de OcoaSalcedo

Topography around Bonao

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

Within 3 km, the terrain around Bonao has only modest variations in elevation — a maximum elevation change of 169 m around an average of 179 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,677 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,072 m.

The land around Bonao is covered by trees (50%) and artificial surfaces (30%) within 3 km, trees (80%) within 16 km, and trees (68%) within 80 km.

3 km
169 m
16 km
1,677 m
80 km
3,072 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Cotuí 30 km · Jarabacoa 31 km · La Vega 33 km · Constanza 35 km · Villa Altagracia 39 km · San Francisco de Macorís 43 km · San José de Ocoa 45 km · Salcedo 49 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 Bonao (18.9415°, -70.4111°, elevation 166 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. 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).