Guatemala City weather in September

In September, Guatemala City sees average daytime highs of 28°C and overnight lows near 17°C, with 121 mm of rain across 18 wet days and about 12.1 hours of daylight. It is the 5th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 7% 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 Guatemala City's 11th-clearest and 12th-windiest month. For the whole year in context, see Guatemala City's year-round climate.

Daytime high
28°
5th warmest
Overnight low
17°
10th coldest
Rainfall
121 mm
18 wet days
Daylight
12 h 06 min
5:54 AM – 5:59 PM
Cloud cover
79%
11th clearest
Wind
5 km/h
12th windiest
Solar energy
5.01 kWh/m²
Travel score
4.8
out of 10
Air quality
Moderate
PM2.5 14 µg/m³ · 2019

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 28°C through the month.

A typical September day in Guatemala City reaches about 28°C in the afternoon and slips back to 17°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 30°C. Set against its neighbours, September runs on par with August and about 1°C warmer than October.

15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12817
22817
32817
42817
52817
62817
72817
82817
92817
102817
112817
122817
132817
142817
152817
162817
172817
182817
192817
202817
212817
222717
232717
242717
252717
262717
272717
282717
292717
302717

Guatemala City weather by month

How September compares with the rest of the year at a glance. September is the 5th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 13°20.511.28.6
Feb28° / 14°20.611.58.0
Mar29° / 15°71.511.96.8
Apr30° / 16°244.512.35.6
May29° / 17°7111.612.74.9
Jun28° / 17°13118.312.84.8
Jul28° / 17°5910.612.85.9
Aug28° / 17°7012.812.55.2
Sep28° / 17°1211812.14.8
Oct26° / 16°9712.111.76.1
Nov26° / 15°23311.37.8
Dec26° / 14°50.911.18.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 7% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 80%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12278
22278
32278
42278
52278
62179
72179
82179
92179
102179
112179
122179
132179
142179
152179
162179
172179
182080
191981
201981
211882
221783
231783
241783
251684
261684
271783
281882
291981
301981

Chance of precipitation in September

Any precipitation

Guatemala City gets around 121 mm of rain over 18 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 59% and peaks near 64% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
152
253
353
454
554
655
755
855
955
1055
1156
1256
1356
1457
1557
1658
1759
1860
1961
2061
2162
2263
2364
2464
2564
2664
2764
2863
2963
3062

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 64% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1347500
2346510
3245530
4244540
5243541
6142561
7141571
8140581
9140581
10139591
11038611
12037621
13036631
14035641
15034651
16033661
17032671
18031681
19030691
20029701
21029701
22028711
23027721
24027721
25027721
26026731
27026731
28026731
29127711
30127711

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 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 5:53 AM to 5:55 AM, and sunset from 6:10 PM to 5:48 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:536:10
212.35:536:10
312.35:536:09
412.25:536:08
512.25:536:07
612.25:536:07
712.25:546:06
812.25:546:05
912.25:546:04
1012.25:546:04
1112.25:546:03
1212.15:546:02
1312.15:546:01
1412.15:546:00
1512.15:546:00
1612.15:545:59
1712.15:545:58
1812.15:545:57
1912.05:545:56
2012.05:545:56
2112.05:545:55
2212.05:545:54
2312.05:545:53
2412.05:545:52
2512.05:545:52
2611.95:555:51
2711.95:555:50
2811.95:555:49
2911.95:555:49
3011.95:555:48

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.01 kWh/m².

For context, solar energy here swings from a low near 4.56 kWh/m² to a high of 6.19 kWh/m² in April across the year — September's 5.01 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.4Bright
25.4Bright
35.4Bright
45.4Bright
55.3Bright
65.3Bright
75.3Bright
85.3Bright
95.3Bright
105.2Bright
115.2Bright
125.2Bright
135.2Bright
145.1Bright
155.1Bright
165.0Bright
175.0Bright
185.0Bright
194.9Bright
204.9Bright
214.8Bright
224.8Bright
234.8Bright
244.7Bright
254.7Bright
264.7Bright
274.7Bright
284.6Bright
294.6Bright
304.6Bright
Planning a trip in September

Hazard calendar for Guatemala City

In seasonPeak

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

Guatemala City'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 Guatemala City?

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

4.8
Sightseeing
11th-best month of the year
5.3
Beach & pool
11th-best month of the year

September is a reasonable time to visit Guatemala City for sightseeing.

What to pack for Guatemala City in September

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

In September, Guatemala City sees daytime highs around 28°C and nights near 17°C. Pack light clothes and rain gear. Worth having: sun protection. About 18 days see rain.

light clothesrain gearsun protection

UV index in Guatemala City 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 Guatemala City peaks around April 13 at about 14 (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 13UV 14Dec 14UV 9
UV index (midday)Level
Jan10Extreme
Feb13Extreme
Mar14Extreme
Apr15Extreme
May13Extreme
Jun13Extreme
Jul13Extreme
Aug13Extreme
Sep13Extreme
Oct12Extreme
Nov10Very high
Dec9Very high

Air quality in Guatemala City 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 Guatemala City is worst in April — around 24 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (August, 11 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Guatemala City's WHO annual average of 14 µg/m³.

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodGoodApr 1824 µg/m³Aug 1411 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb13Moderate
Mar16Moderate
Apr24Moderate
May19Moderate
Jun13Moderate
Jul12Good
Aug11Good
Sep12Moderate
Oct12Good
Nov11Good
Dec12Moderate
Location & terrain

Where is Guatemala City?

Guatemala City sits at 14.6°N, 90.5°W, 1,508 m above sea level, in Guatemala. The nearest listed city is Chinautla, 7.0 km away.

Topography around Guatemala City

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

Within 3 km, the terrain around Guatemala City has only modest variations in elevation — a maximum elevation change of 204 m around an average of 1,480 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,345 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,937 m.

The land around Guatemala City is covered by artificial surfaces (71%) and trees (27%) within 3 km, trees (58%) and artificial surfaces (27%) within 16 km, and trees (62%) within 80 km.

3 km
204 m
16 km
1,345 m
80 km
3,937 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Chinautla 7.0 km · Santa Catarina Pinula 8.0 km · Mixco 10 km · Villa Nueva 15 km · San José Pinula 15 km · San Lucas Sacatepéquez 16 km · Petapa 16 km · San Juan Sacatepéquez 17 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
Evangelical 46%Roman Catholic 42%none 11%

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 Guatemala City (14.6407°, -90.5133°, elevation 1,508 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).