Ostuncalco weather in September

In September, Ostuncalco sees average daytime highs of 22°C and overnight lows near 15°C, with 479 mm of rain across 29.8 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 22°C through the month. The sky is clear or mostly clear about 0% of the time in September, and the air most often feels humid.

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 Ostuncalco's 11th-clearest and 10th-windiest month. For the whole year in context, see Ostuncalco's year-round climate.

Daytime high: 22°; 8th warmest
Overnight low: 15°; 11th coldest
Rainfall: 479 mm; 29.8 wet days
Daylight: 12 h 06 min; 5:58 AM – 6:03 PM
Cloud cover: 89%; 11th clearest
Wind: 4 km/h; 10th windiest
Solar energy: 4.77 kWh/m²
Travel score: 3.3; out of 10

← August Ostuncalco 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 22°C through the month.

A typical September day in Ostuncalco reaches about 22°C in the afternoon and slips back to 15°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 23°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)	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	21	21	21	21	21	21	21	21	21
Avg low (°C)	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15

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

Ostuncalco 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.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	21° / 13°	30	9.6	11.2	7.0
Feb	22° / 13°	39	10.3	11.5	6.8
Mar	22° / 14°	109	20.5	11.9	5.3
Apr	22° / 14°	247	26.9	12.3	4.0
May	22° / 15°	550	30.4	12.7	3.5
Jun	22° / 15°	452	29.4	12.9	3.4
Jul	22° / 15°	297	28.8	12.8	3.7
Aug	22° / 15°	363	30.1	12.5	3.5
Sep	22° / 15°	479	29.8	12.1	3.3
Oct	21° / 15°	362	29.7	11.7	3.5
Nov	21° / 14°	117	21.2	11.3	4.9
Dec	21° / 13°	43	11.8	11.1	6.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 0% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 6% of September, with mostly cloudy or overcast conditions the remaining 94%.

	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 (%)	7	7	6	6	6	6	6	6	6	6	6	6	6	6	5	5	5	5	5	5	5	5	5	5	5	5	6	6	6	6
Cloudier (%)	93	93	94	94	94	94	94	94	94	94	94	94	94	94	95	95	95	95	95	95	95	95	95	95	95	95	94	94	94	94

	Clearer (%)	Cloudier (%)
1	7	93
2	7	93
3	6	94
4	6	94
5	6	94
6	6	94
7	6	94
8	6	94
9	6	94
10	6	94
11	6	94
12	6	94
13	6	94
14	6	94
15	5	95
16	5	95
17	5	95
18	5	95
19	5	95
20	5	95
21	5	95
22	5	95
23	5	95
24	5	95
25	5	95
26	5	95
27	6	94
28	6	94
29	6	94
30	6	94

Chance of precipitation in September

Any precipitation

Ostuncalco gets around 479 mm of rain over 29.8 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 99% and peaks near 100% 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 (%)	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	100	100	100	100	100	100	100	99	99	99

	Rain chance (%)
1	99
2	99
3	99
4	99
5	99
6	99
7	99
8	99
9	99
10	99
11	99
12	99
13	99
14	99
15	99
16	99
17	99
18	99
19	99
20	99
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	99
29	99
30	99

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the humid band about 50% of days. It rarely turns muggy — the humid and sticky bands barely register.

	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
Dry (%)	1	1	1	1	1	1	1	1	1	1	1	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Comfortable (%)	55	55	54	54	54	53	53	52	52	51	50	50	49	48	47	46	46	46	46	46	46	46	46	46	47	47	47	47	48	48
Humid (%)	44	44	45	45	45	46	46	47	47	48	49	50	51	52	53	54	54	54	54	54	54	54	54	54	53	53	53	53	52	52

	Dry (%)	Comfortable (%)	Humid (%)
1	1	55	44
2	1	55	44
3	1	54	45
4	1	54	45
5	1	54	45
6	1	53	46
7	1	53	46
8	1	52	47
9	1	52	47
10	1	51	48
11	1	50	49
12	1	50	50
13	0	49	51
14	0	48	52
15	0	47	53
16	0	46	54
17	0	46	54
18	0	46	54
19	0	46	54
20	0	46	54
21	0	46	54
22	0	46	54
23	0	46	54
24	0	46	54
25	0	47	53
26	0	47	53
27	0	47	53
28	0	47	53
29	0	48	52
30	0	48	52

Wind in September

Winds average 4 km/h in September.

Across September, daily wind ranges from about 4 km/h on the calmest days to 4 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)	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	4	4	4
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	4	calm
2	4	calm
3	4	calm
4	4	calm
5	4	calm
6	4	calm
7	4	calm
8	4	calm
9	4	calm
10	4	calm
11	4	calm
12	4	calm
13	4	calm
14	4	calm
15	4	calm
16	4	calm
17	4	calm
18	4	calm
19	4	calm
20	4	calm
21	4	calm
22	4	calm
23	4	calm
24	4	calm
25	4	calm
26	4	calm
27	4	calm
28	4	calm
29	4	calm
30	4	calm

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 5:57 AM to 5:59 AM, and sunset from 6:15 PM to 5:52 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)	12.3	12.3	12.3	12.3	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	12.0	12.0	12.0	12.0	12.0	12.0	12.0	11.9	11.9	11.9	11.9	11.9
Sunrise (AM)	5:57	5:58	5:58	5:58	5:58	5:58	5:58	5:58	5:58	5:58	5:58	5:58	5:58	5:58	5:58	5:58	5:58	5:58	5:59	5:59	5:59	5:59	5:59	5:59	5:59	5:59	5:59	5:59	5:59	5:59
Sunset (PM)	6:15	6:14	6:13	6:13	6:12	6:11	6:10	6:10	6:09	6:08	6:07	6:06	6:06	6:05	6:04	6:03	6:02	6:02	6:01	6:00	5:59	5:58	5:58	5:57	5:56	5:55	5:55	5:54	5:53	5:52

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.3	5:57	6:15
2	12.3	5:58	6:14
3	12.3	5:58	6:13
4	12.3	5:58	6:13
5	12.2	5:58	6:12
6	12.2	5:58	6:11
7	12.2	5:58	6:10
8	12.2	5:58	6:10
9	12.2	5:58	6:09
10	12.2	5:58	6:08
11	12.2	5:58	6:07
12	12.1	5:58	6:06
13	12.1	5:58	6:06
14	12.1	5:58	6:05
15	12.1	5:58	6:04
16	12.1	5:58	6:03
17	12.1	5:58	6:02
18	12.1	5:58	6:02
19	12.0	5:59	6:01
20	12.0	5:59	6:00
21	12.0	5:59	5:59
22	12.0	5:59	5:58
23	12.0	5:59	5:58
24	12.0	5:59	5:57
25	12.0	5:59	5:56
26	11.9	5:59	5:55
27	11.9	5:59	5:55
28	11.9	5:59	5:54
29	11.9	5:59	5:53
30	11.9	5:59	5:52

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.77 kWh/m².

For context, solar energy here swings from a low near 4.46 kWh/m² to a high of 6.29 kWh/m² in April across the year — September's 4.77 kWh/m² sits near the bottom.

	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)	5.1	5.1	5.1	5.1	5.1	5.0	5.0	5.0	5.0	5.0	4.9	4.9	4.9	4.9	4.8	4.8	4.8	4.7	4.7	4.7	4.6	4.6	4.5	4.5	4.5	4.5	4.5	4.4	4.4	4.4
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	5.1	Bright
2	5.1	Bright
3	5.1	Bright
4	5.1	Bright
5	5.1	Bright
6	5.0	Bright
7	5.0	Bright
8	5.0	Bright
9	5.0	Bright
10	5.0	Bright
11	4.9	Bright
12	4.9	Bright
13	4.9	Bright
14	4.9	Bright
15	4.8	Bright
16	4.8	Bright
17	4.8	Bright
18	4.7	Bright
19	4.7	Bright
20	4.7	Bright
21	4.6	Bright
22	4.6	Bright
23	4.5	Bright
24	4.5	Bright
25	4.5	Bright
26	4.5	Bright
27	4.5	Bright
28	4.4	Bright
29	4.4	Bright
30	4.4	Bright

Planning a trip in September

Hazard calendar for Ostuncalco

In seasonPeak

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

Ostuncalco'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 Ostuncalco?

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

3.3

Sightseeing

12th-best month of the year

2.2

Beach & pool

12th-best month of the year

September is a weaker month for outdoor sightseeing in Ostuncalco.

What to pack for Ostuncalco in September

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

In September, Ostuncalco sees daytime highs around 22°C and nights near 15°C. Pack rain gear. Worth having: sun protection. About 30 days see rain.

rain gearsun protection

UV index in Ostuncalco 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 Ostuncalco peaks around April 12 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)	9	13	14	14	12	13	13	13	12	11	9	9
Level	Very high	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Very high

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

Air quality in Ostuncalco 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 Ostuncalco is worst in May — around 34 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	23	22	25	34	34	23	23	22	23	23	23	25
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	23	Moderate
Feb	22	Moderate
Mar	25	Moderate
Apr	34	Moderate
May	34	Moderate
Jun	23	Moderate
Jul	23	Moderate
Aug	22	Moderate
Sep	23	Moderate
Oct	23	Moderate
Nov	23	Moderate
Dec	25	Moderate

Location & terrain

Where is Ostuncalco?

Ostuncalco sits at 14.9°N, 91.6°W, 2,506 m above sea level, in Guatemala. The nearest listed city is La Esperanza, 6.0 km away.

Topography around Ostuncalco

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

Within 3 km, the terrain around Ostuncalco has significant variations in elevation — a maximum elevation change of 574 m around an average of 2,581 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 2,708 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,178 m.

The land around Ostuncalco is covered by trees (38%), cropland (38%) and artificial surfaces (20%) within 3 km, trees (66%) within 16 km, and trees (69%) within 80 km.

3 km

574 m

trees 38%

16 km

2,708 m

trees 66%

80 km

4,178 m

trees 69%

treesgrasslandcroplandartificial surfacesbare terrainwatermangroves

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

September weather nearby: La Esperanza 6.0 km · Quetzaltenango 11 km · San Andrés Xecul 15 km · Salcajá 18 km · San Pedro Sacatepéquez 19 km · Cantel 19 km · San Francisco El Alto 21 km · San Marcos 21 km

Guatemala travel facts

Travel advisory: Level 3; Reconsider Travel
Power plugs: Type A / B; 120 V · 60 Hz
Prices: ≈ 43% of US; price level, 2025
GDP per capita: $6,598; 2025
Happiness: 6.5 / 10; World Happiness, 2025
Safe drinking water: 49%; of population, 2024
Homicide rate: 23.4; per 100k, 2023
Road deaths: 22.9; per 100k/yr, 2019
Income group: Upper middle; World Bank
English: Moderate; EF EPI 510
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 Ostuncalco (14.869°, -91.6214°, elevation 2,506 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).

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

	Clearer (%)	Cloudier (%)
1	7	93
2	7	93
3	6	94
4	6	94
5	6	94
6	6	94
7	6	94
8	6	94
9	6	94
10	6	94
11	6	94
12	6	94
13	6	94
14	6	94
15	5	95
16	5	95
17	5	95
18	5	95
19	5	95
20	5	95
21	5	95
22	5	95
23	5	95
24	5	95
25	5	95
26	5	95
27	6	94
28	6	94
29	6	94
30	6	94

	Rain chance (%)
1	99
2	99
3	99
4	99
5	99
6	99
7	99
8	99
9	99
10	99
11	99
12	99
13	99
14	99
15	99
16	99
17	99
18	99
19	99
20	99
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	99
29	99
30	99

	Dry (%)	Comfortable (%)	Humid (%)
1	1	55	44
2	1	55	44
3	1	54	45
4	1	54	45
5	1	54	45
6	1	53	46
7	1	53	46
8	1	52	47
9	1	52	47
10	1	51	48
11	1	50	49
12	1	50	50
13	0	49	51
14	0	48	52
15	0	47	53
16	0	46	54
17	0	46	54
18	0	46	54
19	0	46	54
20	0	46	54
21	0	46	54
22	0	46	54
23	0	46	54
24	0	46	54
25	0	47	53
26	0	47	53
27	0	47	53
28	0	47	53
29	0	48	52
30	0	48	52

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

	Clearer (%)	Cloudier (%)
1	7	93
2	7	93
3	6	94
4	6	94
5	6	94
6	6	94
7	6	94
8	6	94
9	6	94
10	6	94
11	6	94
12	6	94
13	6	94
14	6	94
15	5	95
16	5	95
17	5	95
18	5	95
19	5	95
20	5	95
21	5	95
22	5	95
23	5	95
24	5	95
25	5	95
26	5	95
27	6	94
28	6	94
29	6	94
30	6	94

	Rain chance (%)
1	99
2	99
3	99
4	99
5	99
6	99
7	99
8	99
9	99
10	99
11	99
12	99
13	99
14	99
15	99
16	99
17	99
18	99
19	99
20	99
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	99
29	99
30	99

	Dry (%)	Comfortable (%)	Humid (%)
1	1	55	44
2	1	55	44
3	1	54	45
4	1	54	45
5	1	54	45
6	1	53	46
7	1	53	46
8	1	52	47
9	1	52	47
10	1	51	48
11	1	50	49
12	1	50	50
13	0	49	51
14	0	48	52
15	0	47	53
16	0	46	54
17	0	46	54
18	0	46	54
19	0	46	54
20	0	46	54
21	0	46	54
22	0	46	54
23	0	46	54
24	0	46	54
25	0	47	53
26	0	47	53
27	0	47	53
28	0	47	53
29	0	48	52
30	0	48	52

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

	Clearer (%)	Cloudier (%)
1	7	93
2	7	93
3	6	94
4	6	94
5	6	94
6	6	94
7	6	94
8	6	94
9	6	94
10	6	94
11	6	94
12	6	94
13	6	94
14	6	94
15	5	95
16	5	95
17	5	95
18	5	95
19	5	95
20	5	95
21	5	95
22	5	95
23	5	95
24	5	95
25	5	95
26	5	95
27	6	94
28	6	94
29	6	94
30	6	94

	Rain chance (%)
1	99
2	99
3	99
4	99
5	99
6	99
7	99
8	99
9	99
10	99
11	99
12	99
13	99
14	99
15	99
16	99
17	99
18	99
19	99
20	99
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	99
29	99
30	99

	Dry (%)	Comfortable (%)	Humid (%)
1	1	55	44
2	1	55	44
3	1	54	45
4	1	54	45
5	1	54	45
6	1	53	46
7	1	53	46
8	1	52	47
9	1	52	47
10	1	51	48
11	1	50	49
12	1	50	50
13	0	49	51
14	0	48	52
15	0	47	53
16	0	46	54
17	0	46	54
18	0	46	54
19	0	46	54
20	0	46	54
21	0	46	54
22	0	46	54
23	0	46	54
24	0	46	54
25	0	47	53
26	0	47	53
27	0	47	53
28	0	47	53
29	0	48	52
30	0	48	52