San Carlos weather in September

In September, San Carlos sees average daytime highs of 30°C and overnight lows near 24°C, with 252 mm of rain across 29 wet days and about 12.1 hours of daylight. It is the 4th-warmest and 2nd-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 3% of the time in September, and the air most often feels oppressive.

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 San Carlos's 8th-clearest and 12th-windiest month. For the whole year in context, see San Carlos's year-round climate.

Daytime high: 30°; 4th warmest
Overnight low: 24°; 7th coldest
Rainfall: 252 mm; 29 wet days
Daylight: 12 h 06 min; 5:32 AM – 5:35 PM
Cloud cover: 84%; 8th clearest
Wind: 8 km/h; 12th windiest
Solar energy: 4.42 kWh/m²
Travel score: 2.7; out of 10

San Carlos is Urban area of the San Carlos Municipality in Nicaragua. Seat of the San Carlos Municipality..

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← August San Carlos year-round climate October →Best places to visit in September

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

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 San Carlos reaches about 30°C in the afternoon and slips back to 24°C overnight — a 6°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.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	29	29	29	29	29	29	29	29	29
Avg low (°C)	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24

	Avg high (°C)	Avg low (°C)
1	30	24
2	30	24
3	30	24
4	30	24
5	30	24
6	30	24
7	30	24
8	30	24
9	30	24
10	30	24
11	30	24
12	30	24
13	30	24
14	30	24
15	30	24
16	30	24
17	30	24
18	30	24
19	30	24
20	30	24
21	30	24
22	29	24
23	29	24
24	29	24
25	29	24
26	29	24
27	29	24
28	29	24
29	29	24
30	29	24

How September really feels in San Carlos

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

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

San Carlos weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 2nd-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	28° / 23°	36	14.9	11.4	5.8
Feb	29° / 23°	25	10.1	11.6	5.7
Mar	30° / 23°	16	6.6	11.9	5.6
Apr	31° / 24°	30	8.7	12.2	4.5
May	31° / 24°	180	22.8	12.5	3.2
Jun	30° / 24°	245	28.9	12.6	2.7
Jul	29° / 24°	220	29.4	12.6	2.9
Aug	29° / 24°	218	29.7	12.4	2.8
Sep	30° / 24°	252	29	12.1	2.7
Oct	29° / 24°	263	29.1	11.8	3.0
Nov	29° / 23°	147	22.6	11.5	3.9
Dec	28° / 23°	64	18	11.4	5.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 3% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 9% of September, with mostly cloudy or overcast conditions the remaining 88%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	11	11	11	12	13	13	13	12	12	12	12	12	12	12	12	13	13	13	13	12	12	12	12	12	12	12	12	11	11	11
Cloudier (%)	89	89	89	88	87	87	87	88	88	88	88	88	88	88	88	87	87	87	87	88	88	88	88	88	88	88	88	89	89	89

	Clearer (%)	Cloudier (%)
1	11	89
2	11	89
3	11	89
4	12	88
5	13	87
6	13	87
7	13	87
8	12	88
9	12	88
10	12	88
11	12	88
12	12	88
13	12	88
14	12	88
15	12	88
16	13	87
17	13	87
18	13	87
19	13	87
20	12	88
21	12	88
22	12	88
23	12	88
24	12	88
25	12	88
26	12	88
27	12	88
28	11	89
29	11	89
30	11	89

Chance of precipitation in September

Any precipitation

San Carlos gets around 252 mm of rain over 29 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 97% and peaks near 98% on the wettest days.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	95	95	95	95	95	96	96	96	96	97	97	97	97	98	98	98	98	98	98	98	98	98	98	98	97	97	97	96	96	96

	Rain chance (%)
1	95
2	95
3	95
4	95
5	95
6	96
7	96
8	96
9	96
10	97
11	97
12	97
13	97
14	98
15	98
16	98
17	98
18	98
19	98
20	98
21	98
22	98
23	98
24	98
25	97
26	97
27	97
28	96
29	96
30	96

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 72% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Oppressive (%)	75	75	74	73	73	72	72	71	71	70	70	69	69	69	69	69	69	69	69	70	70	71	71	72	72	73	74	74	75	75
Miserable (%)	25	25	26	27	27	28	28	29	29	30	30	31	31	31	31	31	31	31	31	30	30	29	29	28	28	27	26	26	25	25

	Oppressive (%)	Miserable (%)
1	75	25
2	75	25
3	74	26
4	73	27
5	73	27
6	72	28
7	72	28
8	71	29
9	71	29
10	70	30
11	70	30
12	69	31
13	69	31
14	69	31
15	69	31
16	69	31
17	69	31
18	69	31
19	69	31
20	70	30
21	70	30
22	71	29
23	71	29
24	72	28
25	72	28
26	73	27
27	74	26
28	74	26
29	75	25
30	75	25

Wind in September

Winds average 8 km/h in September, the calmest month.

Across September, daily wind ranges from about 8 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	8	calm
2	8	calm
3	8	calm
4	8	calm
5	8	calm
6	8	calm
7	8	calm
8	8	calm
9	8	calm
10	8	calm
11	8	calm
12	8	calm
13	8	calm
14	8	calm
15	8	calm
16	8	calm
17	8	calm
18	8	calm
19	8	calm
20	8	calm
21	8	calm
22	8	calm
23	8	calm
24	8	calm
25	8	calm
26	8	calm
27	8	calm
28	8	calm
29	8	calm
30	8	calm

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 5:32 AM to 5:31 AM, and sunset from 5:45 PM to 5:26 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	12.2	12.2	12.2	12.2	12.2	12.2	12.2	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	11.9	11.9	11.9	11.9
Sunrise (AM)	5:32	5:32	5:32	5:32	5:32	5:32	5:32	5:32	5:32	5:32	5:32	5:32	5:32	5:32	5:32	5:32	5:32	5:31	5:31	5:31	5:31	5:31	5:31	5:31	5:31	5:31	5:31	5:31	5:31	5:31
Sunset (PM)	5:45	5:45	5:44	5:43	5:43	5:42	5:41	5:41	5:40	5:39	5:39	5:38	5:37	5:37	5:36	5:35	5:35	5:34	5:33	5:33	5:32	5:31	5:30	5:30	5:29	5:28	5:28	5:27	5:26	5:26

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.2	5:32	5:45
2	12.2	5:32	5:45
3	12.2	5:32	5:44
4	12.2	5:32	5:43
5	12.2	5:32	5:43
6	12.2	5:32	5:42
7	12.2	5:32	5:41
8	12.1	5:32	5:41
9	12.1	5:32	5:40
10	12.1	5:32	5:39
11	12.1	5:32	5:39
12	12.1	5:32	5:38
13	12.1	5:32	5:37
14	12.1	5:32	5:37
15	12.1	5:32	5:36
16	12.1	5:32	5:35
17	12.1	5:32	5:35
18	12.0	5:31	5:34
19	12.0	5:31	5:33
20	12.0	5:31	5:33
21	12.0	5:31	5:32
22	12.0	5:31	5:31
23	12.0	5:31	5:30
24	12.0	5:31	5:30
25	12.0	5:31	5:29
26	12.0	5:31	5:28
27	11.9	5:31	5:28
28	11.9	5:31	5:27
29	11.9	5:31	5:26
30	11.9	5:31	5:26

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.42 kWh/m².

For context, solar energy here swings from a low near 3.57 kWh/m² to a high of 5.62 kWh/m² in April across the year — September's 4.42 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	4.5	4.5	4.5	4.5	4.5	4.5	4.5	4.5	4.5	4.5	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.3	4.3	4.3	4.3	4.3	4.3	4.3
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	4.5	Bright
2	4.5	Bright
3	4.5	Bright
4	4.5	Bright
5	4.5	Bright
6	4.5	Bright
7	4.5	Bright
8	4.5	Bright
9	4.5	Bright
10	4.5	Bright
11	4.4	Bright
12	4.4	Bright
13	4.4	Bright
14	4.4	Bright
15	4.4	Bright
16	4.4	Bright
17	4.4	Bright
18	4.4	Bright
19	4.4	Bright
20	4.4	Bright
21	4.4	Bright
22	4.4	Bright
23	4.4	Bright
24	4.3	Bright
25	4.3	Bright
26	4.3	Bright
27	4.3	Bright
28	4.3	Bright
29	4.3	Bright
30	4.3	Bright

Planning a trip in September

Hazard calendar for San Carlos

In seasonPeak

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

San Carlos sits in the Atlantic hurricane belt; the season peaks August–October.

San Carlos's rainy season runs May–November, when most of the year's rain falls.

Atlantic hurricane

Rainy season

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is September a good time to visit San Carlos?

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

2.7

Sightseeing

11th-best month of the year

3.7

Beach & pool

12th-best month of the year

September is a weaker month for outdoor sightseeing in San Carlos.

What to pack for San Carlos in September

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

In September, San Carlos sees daytime highs around 30°C and nights near 24°C. Pack light clothes and rain gear. About 29 days see rain.

light clothesrain gear

UV index in San Carlos 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 San Carlos peaks around March 19 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 9 (very high).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	11	13	14	13	12	13	12	13	12	11	10	9
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Very high

	UV index (midday)	Level
Jan	11	Extreme
Feb	13	Extreme
Mar	14	Extreme
Apr	13	Extreme
May	12	Extreme
Jun	13	Extreme
Jul	12	Extreme
Aug	13	Extreme
Sep	12	Extreme
Oct	11	Extreme
Nov	10	Extreme
Dec	9	Very high

Air quality in San Carlos 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 San Carlos is worst in July — around 24 µg/m³ PM2.5 (moderate), about 3.6× the cleanest month (December, 7 µg/m³).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	7	9	10	18	22	20	24	19	13	10	7	7
Level	Good	Good	Good	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Good	Good	Good

	PM2.5 (µg/m³)	Level
Jan	7	Good
Feb	9	Good
Mar	10	Good
Apr	18	Moderate
May	22	Moderate
Jun	20	Moderate
Jul	24	Moderate
Aug	19	Moderate
Sep	13	Moderate
Oct	10	Good
Nov	7	Good
Dec	7	Good

Location & terrain

Where is San Carlos?

San Carlos sits at 11.1°N, 84.8°W, 0 m above sea level, in Nicaragua. The nearest listed city is El Castillo, 43 km away.

Topography around San Carlos

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

Within 3 km, the terrain around San Carlos has only modest variations in elevation — a maximum elevation change of 67 m around an average of 35 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 152 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,960 m.

The land around San Carlos is covered by water (46%) and trees (35%) within 3 km, water (39%), grassland (30%) and trees (29%) within 16 km, and trees (52%) and grassland (28%) within 80 km.

3 km

67 m

water 46%

16 km

152 m

water 39%

80 km

1,960 m

trees 52%

treesgrasslandcroplandartificial surfaceswaterwetland

← August San Carlos year-round climate October →Best places to visit in September

September weather nearby: El Castillo 43 km · San José 44 km · Nueva Guinea 72 km · La Fortuna 74 km · Cañas 85 km · Liberia 90 km · Monteverde 91 km · Quesada 97 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

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 San Carlos (11.1271°, -84.7779°, 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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).

	Avg high (°C)	Avg low (°C)
1	30	24
2	30	24
3	30	24
4	30	24
5	30	24
6	30	24
7	30	24
8	30	24
9	30	24
10	30	24
11	30	24
12	30	24
13	30	24
14	30	24
15	30	24
16	30	24
17	30	24
18	30	24
19	30	24
20	30	24
21	30	24
22	29	24
23	29	24
24	29	24
25	29	24
26	29	24
27	29	24
28	29	24
29	29	24
30	29	24

	Clearer (%)	Cloudier (%)
1	11	89
2	11	89
3	11	89
4	12	88
5	13	87
6	13	87
7	13	87
8	12	88
9	12	88
10	12	88
11	12	88
12	12	88
13	12	88
14	12	88
15	12	88
16	13	87
17	13	87
18	13	87
19	13	87
20	12	88
21	12	88
22	12	88
23	12	88
24	12	88
25	12	88
26	12	88
27	12	88
28	11	89
29	11	89
30	11	89

	Rain chance (%)
1	95
2	95
3	95
4	95
5	95
6	96
7	96
8	96
9	96
10	97
11	97
12	97
13	97
14	98
15	98
16	98
17	98
18	98
19	98
20	98
21	98
22	98
23	98
24	98
25	97
26	97
27	97
28	96
29	96
30	96

	Oppressive (%)	Miserable (%)
1	75	25
2	75	25
3	74	26
4	73	27
5	73	27
6	72	28
7	72	28
8	71	29
9	71	29
10	70	30
11	70	30
12	69	31
13	69	31
14	69	31
15	69	31
16	69	31
17	69	31
18	69	31
19	69	31
20	70	30
21	70	30
22	71	29
23	71	29
24	72	28
25	72	28
26	73	27
27	74	26
28	74	26
29	75	25
30	75	25

	Avg high (°C)	Avg low (°C)
1	30	24
2	30	24
3	30	24
4	30	24
5	30	24
6	30	24
7	30	24
8	30	24
9	30	24
10	30	24
11	30	24
12	30	24
13	30	24
14	30	24
15	30	24
16	30	24
17	30	24
18	30	24
19	30	24
20	30	24
21	30	24
22	29	24
23	29	24
24	29	24
25	29	24
26	29	24
27	29	24
28	29	24
29	29	24
30	29	24

	Clearer (%)	Cloudier (%)
1	11	89
2	11	89
3	11	89
4	12	88
5	13	87
6	13	87
7	13	87
8	12	88
9	12	88
10	12	88
11	12	88
12	12	88
13	12	88
14	12	88
15	12	88
16	13	87
17	13	87
18	13	87
19	13	87
20	12	88
21	12	88
22	12	88
23	12	88
24	12	88
25	12	88
26	12	88
27	12	88
28	11	89
29	11	89
30	11	89

	Rain chance (%)
1	95
2	95
3	95
4	95
5	95
6	96
7	96
8	96
9	96
10	97
11	97
12	97
13	97
14	98
15	98
16	98
17	98
18	98
19	98
20	98
21	98
22	98
23	98
24	98
25	97
26	97
27	97
28	96
29	96
30	96

	Oppressive (%)	Miserable (%)
1	75	25
2	75	25
3	74	26
4	73	27
5	73	27
6	72	28
7	72	28
8	71	29
9	71	29
10	70	30
11	70	30
12	69	31
13	69	31
14	69	31
15	69	31
16	69	31
17	69	31
18	69	31
19	69	31
20	70	30
21	70	30
22	71	29
23	71	29
24	72	28
25	72	28
26	73	27
27	74	26
28	74	26
29	75	25
30	75	25

	Avg high (°C)	Avg low (°C)
1	30	24
2	30	24
3	30	24
4	30	24
5	30	24
6	30	24
7	30	24
8	30	24
9	30	24
10	30	24
11	30	24
12	30	24
13	30	24
14	30	24
15	30	24
16	30	24
17	30	24
18	30	24
19	30	24
20	30	24
21	30	24
22	29	24
23	29	24
24	29	24
25	29	24
26	29	24
27	29	24
28	29	24
29	29	24
30	29	24

	Clearer (%)	Cloudier (%)
1	11	89
2	11	89
3	11	89
4	12	88
5	13	87
6	13	87
7	13	87
8	12	88
9	12	88
10	12	88
11	12	88
12	12	88
13	12	88
14	12	88
15	12	88
16	13	87
17	13	87
18	13	87
19	13	87
20	12	88
21	12	88
22	12	88
23	12	88
24	12	88
25	12	88
26	12	88
27	12	88
28	11	89
29	11	89
30	11	89

	Rain chance (%)
1	95
2	95
3	95
4	95
5	95
6	96
7	96
8	96
9	96
10	97
11	97
12	97
13	97
14	98
15	98
16	98
17	98
18	98
19	98
20	98
21	98
22	98
23	98
24	98
25	97
26	97
27	97
28	96
29	96
30	96

	Oppressive (%)	Miserable (%)
1	75	25
2	75	25
3	74	26
4	73	27
5	73	27
6	72	28
7	72	28
8	71	29
9	71	29
10	70	30
11	70	30
12	69	31
13	69	31
14	69	31
15	69	31
16	69	31
17	69	31
18	69	31
19	69	31
20	70	30
21	70	30
22	71	29
23	71	29
24	72	28
25	72	28
26	73	27
27	74	26
28	74	26
29	75	25
30	75	25