Monteverde weather in September

In September, Monteverde sees average daytime highs of 27°C and overnight lows near 20°C, with 346 mm of rain across 28.3 wet days and about 12.1 hours of daylight. It is the 8th-warmest and 2nd-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 1% of the time in September, and the air most often feels muggy.

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

Daytime high
27°
8th warmest
Overnight low
20°
8th coldest
Rainfall
346 mm
28.3 wet days
Daylight
12 h 06 min
5:32 AM – 5:35 PM
Cloud cover
91%
10th clearest
Wind
5 km/h
12th windiest
Solar energy
4.37 kWh/m²
Travel score
3.5
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 Monteverde reaches about 27°C in the afternoon and slips back to 20°C overnight — a 7°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)
12720
22720
32720
42720
52720
62720
72720
82720
92720
102720
112720
122720
132720
142720
152720
162720
172720
182720
192720
202720
212720
222720
232720
242620
252620
262620
272620
282620
292620
302620

Monteverde weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 18°123.511.57.9
Feb27° / 18°9211.78.0
Mar29° / 19°82.111.97.0
Apr29° / 20°467.712.25.5
May28° / 20°26021.412.54.2
Jun27° / 20°28725.612.63.8
Jul27° / 20°20022.512.54.3
Aug27° / 20°24624.412.34.1
Sep27° / 20°34628.312.13.5
Oct26° / 20°3812811.83.7
Nov26° / 19°16519.411.55.0
Dec26° / 19°447.511.47.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 1% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 3% of September, with mostly cloudy or overcast conditions the remaining 97%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1496
2496
3496
4496
5496
6397
7397
8397
9397
10397
11397
12397
13397
14397
15397
16298
17397
18397
19397
20397
21397
22397
23397
24397
25397
26397
27397
28397
29397
30298

Chance of precipitation in September

Any precipitation

Monteverde gets around 346 mm of rain over 28.3 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 94% and peaks near 96% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
191
291
391
492
592
692
792
893
993
1093
1193
1294
1394
1494
1594
1695
1795
1895
1996
2096
2196
2296
2396
2495
2595
2695
2795
2894
2994
3094

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 95% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)
1955
2955
3955
4955
5955
6955
7955
8955
9955
10955
11955
12955
13955
14955
15955
16955
17955
18964
19964
20964
21964
22964
23964
24964
25964
26964
27964
28964
29964
30964

Wind in September

Winds average 5 km/h in September, the calmest month.

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

0246810151015202530
Wind speed (km/h)Feels
15calm
25calm
35calm
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 12 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 18 minutes over September. Sunrise moves from 5:33 AM to 5:31 AM, and sunset from 5:45 PM to 5:26 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.25:335:45
212.25:335:44
312.25:335:44
412.25:335:43
512.25:335:42
612.25:335:42
712.15:335:41
812.15:335:41
912.15:325:40
1012.15:325:39
1112.15:325:39
1212.15:325:38
1312.15:325:37
1412.15:325:37
1512.15:325:36
1612.15:325:35
1712.05:325:35
1812.05:325:34
1912.05:325:33
2012.05:325:33
2112.05:315:32
2212.05:315:31
2312.05:315:31
2412.05:315:30
2512.05:315:29
2612.05:315:29
2711.95:315:28
2811.95:315:27
2911.95:315:27
3011.95:315:26

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.37 kWh/m².

For context, solar energy here swings from a low near 3.91 kWh/m² to a high of 6.29 kWh/m² in March across the year — September's 4.37 kWh/m² sits near the bottom.

024151015202530
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.5Bright
44.5Bright
54.5Bright
64.5Bright
74.5Bright
84.5Bright
94.5Bright
104.5Bright
114.4Bright
124.4Bright
134.4Bright
144.4Bright
154.4Bright
164.4Bright
174.3Bright
184.3Bright
194.3Bright
204.3Bright
214.3Bright
224.3Bright
234.3Bright
244.3Bright
254.2Bright
264.2Bright
274.2Bright
284.2Bright
294.2Bright
304.2Bright
Planning a trip in September

Hazard calendar for Monteverde

In seasonPeak

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

Monteverde's rainy season runs May–October, 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 Monteverde?

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

3.5
Sightseeing
12th-best month of the year
3.5
Beach & pool
12th-best month of the year

September is a weaker month for outdoor sightseeing in Monteverde.

What to pack for Monteverde in September

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

In September, Monteverde sees daytime highs around 27°C and nights near 20°C. Pack rain gear. Worth having: light clothes. About 28 days see rain.

rain gearlight clothes

Sea temperature near Monteverde 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 52 km away) is warmest in April at about 29°C and coldest in November near 28°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
Jan29Tropical
Feb29Tropical
Mar29Tropical
Apr29Tropical
May29Tropical
Jun29Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct28Tropical
Nov28Warm
Dec28Tropical

UV index in Monteverde in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Monteverde peaks around March 17 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 10 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 17UV 14Dec 16UV 10
UV index (midday)Level
Jan11Extreme
Feb14Extreme
Mar14Extreme
Apr14Extreme
May13Extreme
Jun13Extreme
Jul12Extreme
Aug13Extreme
Sep13Extreme
Oct12Extreme
Nov11Extreme
Dec10Very high

Air quality in Monteverde 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 Monteverde is worst in May — around 23 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (January, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodMay 1623 µg/m³Jan 1210 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb11Good
Mar13Moderate
Apr21Moderate
May23Moderate
Jun21Moderate
Jul22Moderate
Aug20Moderate
Sep18Moderate
Oct15Moderate
Nov12Good
Dec10Good
Location & terrain

Where is Monteverde?

Monteverde sits at 10.3°N, 84.8°W, 0 m above sea level, in Costa Rica. The nearest listed city is La Fortuna, 26 km away.

La FortunaCañasChacaritaPuntarenasEsparzaQuesadaSan_Ramon_Nicoya

Topography around Monteverde

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

Within 3 km, the terrain around Monteverde has large variations in elevation — a maximum elevation change of 1,048 m around an average of 1,390 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,704 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,891 m.

The land around Monteverde is covered by trees (90%) within 3 km, trees (83%) within 16 km, and trees (60%) and grassland (25%) within 80 km.

3 km
1,048 m
16 km
1,704 m
80 km
2,891 m
treesgrasslandcroplandartificial surfaceswatermangroves
September weather nearby: La Fortuna 26 km · Cañas 34 km · Chacarita 36 km · Puntarenas 37 km · Esparza 38 km · Quesada 41 km · San_Ramon_ 45 km · Nicoya 72 km

Costa Rica travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 59% of US
price level, 2025
GDP per capita
$19,970
2025
Happiness
7.4 / 10
World Happiness, 2025
Safe drinking water
81%
of population, 2024
Homicide rate
17.7
per 100k, 2023
Road deaths
14.8
per 100k/yr, 2019
Income group
High
World Bank
English
Moderate
EF EPI 516
Religion
Roman Catholic 48%none 27%Evangelical and Pentecostal 20%other 3%

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 Monteverde (10.3077°, -84.8106°, elevation 0 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).