Río Blanco weather in September

In September, Río Blanco sees average daytime highs of 30°C and overnight lows near 22°C, with 178 mm of rain across 26.8 wet days and about 12.1 hours of daylight. It is the 4th-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 30°C through the month. The sky is clear or mostly clear about 6% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 18 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Río Blanco's 10th-clearest and 12th-windiest month. For the whole year in context, see Río Blanco's year-round climate.

Daytime high
30°
4th warmest
Overnight low
22°
7th coldest
Rainfall
178 mm
26.8 wet days
Daylight
12 h 06 min
5:33 AM – 5:37 PM
Cloud cover
79%
10th clearest
Wind
6 km/h
12th windiest
Solar energy
4.85 kWh/m²
Travel score
3.0
out of 10

Río Blanco is urban settlement and municipal seat in Matagalpa Department, Nicaragua.

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 30°C through the month.

A typical September day in Río Blanco reaches about 30°C in the afternoon and slips back to 22°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 31°C. Set against its neighbours, September runs on par with August and on par with October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12922
22922
32922
42922
52922
63022
73022
83022
93022
103022
113022
123022
133022
143022
153022
163022
173022
183022
193022
203022
213022
223022
233022
243022
253022
263022
273022
283022
293022
302922

How September really feels in Río Blanco

Once humidity and wind are folded in, September averages 30 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
30
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.

Río Blanco weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 20°4015.211.35.9
Feb28° / 20°2911.611.65.9
Mar30° / 21°259.411.95.4
Apr31° / 22°4110.712.34.3
May31° / 22°15922.412.63.1
Jun29° / 22°2122812.72.9
Jul28° / 22°17629.312.73.2
Aug29° / 22°16228.112.43.2
Sep30° / 22°17826.812.13.0
Oct29° / 22°19225.911.73.4
Nov28° / 21°10219.311.44.7
Dec27° / 20°5016.511.35.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 6% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 12% of September, with mostly cloudy or overcast conditions the remaining 82%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12278
22278
32278
42278
52179
62278
72278
82278
92179
102179
112080
122080
131981
141981
151783
161783
171783
181783
191585
201585
211585
221585
231585
241585
251585
261585
271585
281585
291585
301585

Chance of precipitation in September

Any precipitation

Río Blanco gets around 178 mm of rain over 26.8 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 89% and peaks near 91% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
191
290
390
490
590
690
790
889
989
1089
1189
1289
1389
1489
1589
1689
1789
1890
1990
2090
2190
2290
2389
2489
2589
2689
2789
2889
2989
3089

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 99% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
11981
21981
31981
41981
51990
61990
71990
81990
91981
101981
111981
121981
131981
141981
150991
160991
170991
180991
190991
200991
210991
220991
230991
240991
250991
260991
271981
281981
291981
301981

Wind in September

Winds average 6 km/h in September, the calmest month.

Across September, daily wind ranges from about 6 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
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 18 min at the start of September to 11 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 24 minutes over September. Sunrise moves from 5:33 AM to 5:33 AM, and sunset from 5:48 PM to 5:27 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:335:48
212.25:335:47
312.25:335:47
412.25:335:46
512.25:335:45
612.25:335:45
712.25:335:44
812.25:335:43
912.25:335:43
1012.15:335:42
1112.15:335:41
1212.15:335:40
1312.15:335:40
1412.15:335:39
1512.15:335:38
1612.15:335:37
1712.15:335:37
1812.05:335:36
1912.05:335:35
2012.05:335:34
2112.05:335:34
2212.05:335:33
2312.05:335:32
2412.05:335:31
2512.05:335:31
2611.95:335:30
2711.95:335:29
2811.95:335:29
2911.95:335:28
3011.95:335:27

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.85 kWh/m².

For context, solar energy here swings from a low near 3.96 kWh/m² to a high of 5.78 kWh/m² in April across the year — September's 4.85 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.9Bright
44.9Bright
54.9Bright
64.9Bright
74.9Bright
84.9Bright
94.9Bright
104.9Bright
114.9Bright
124.9Bright
134.9Bright
144.8Bright
154.8Bright
164.8Bright
174.8Bright
184.8Bright
194.8Bright
204.8Bright
214.8Bright
224.8Bright
234.7Bright
244.7Bright
254.7Bright
264.7Bright
274.7Bright
284.7Bright
294.7Bright
304.6Bright
Planning a trip in September

Hazard calendar for Río Blanco

In seasonPeak

In September, Río Blanco sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Río Blanco's rainy season runs May–November, 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 Río Blanco?

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

3.0
Sightseeing
11th-best month of the year
4.0
Beach & pool
9th-best month of the year

September is a weaker month for outdoor sightseeing in Río Blanco.

What to pack for Río Blanco in September

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

In September, Río Blanco sees daytime highs around 30°C and nights near 22°C. Pack light clothes and rain gear. Worth having: sun protection. About 27 days see rain.

light clothesrain gearsun protection

UV index in Río Blanco 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 Río Blanco peaks around April 9 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 14 at about 9 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highApr 9UV 13Dec 14UV 9
UV index (midday)Level
Jan10Extreme
Feb13Extreme
Mar13Extreme
Apr14Extreme
May12Extreme
Jun13Extreme
Jul12Extreme
Aug12Extreme
Sep12Extreme
Oct12Extreme
Nov10Very high
Dec9Very high

Air quality in Río Blanco 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 Río Blanco is worst in July — around 25 µg/m³ PM2.5 (moderate), about 4.6× the cleanest month (December, 5 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1624 µg/m³Dec 215 µg/m³
PM2.5 (µg/m³)Level
Jan6Good
Feb7Good
Mar8Good
Apr17Moderate
May21Moderate
Jun19Moderate
Jul25Moderate
Aug18Moderate
Sep13Moderate
Oct10Good
Nov6Good
Dec5Good
Location & terrain

Where is Río Blanco?

Río Blanco sits at 12.9°N, 85.2°W, 265 m above sea level, in Nicaragua. The nearest listed city is Camoapa, 69 km away.

CamoapaBoacoMatagalpaJinotegaJuigalpaSiunaEstelíTipitapa

Topography around Río Blanco

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

Within 3 km, the terrain around Río Blanco has large variations in elevation — a maximum elevation change of 765 m around an average of 368 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,311 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,708 m.

The land around Río Blanco is covered by trees (57%) and grassland (40%) within 3 km, trees (70%) and grassland (30%) within 16 km, and trees (66%) and grassland (34%) within 80 km.

3 km
765 m
16 km
1,311 m
80 km
1,708 m
treesgrasslandartificial surfaces
September weather nearby: Camoapa 69 km · Boaco 70 km · Matagalpa 75 km · Jinotega 86 km · Juigalpa 93 km · Siuna 101 km · Estelí 124 km · Tipitapa 125 km

Nicaragua travel facts

Travel advisory
Level 3
Reconsider Travel
Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 34% of US
price level, 2025
GDP per capita
$3,173
2025
Happiness
6.3 / 10
World Happiness, 2025
Homicide rate
11.3
per 100k, 2021
Road deaths
16.9
per 100k/yr, 2019
Income group
Lower middle
World Bank
English
Moderate
EF EPI 512
Religion
Roman Catholic 45%Protestant 39%none 14%other 1%

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 Río Blanco (12.9344°, -85.2235°, elevation 265 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).