Belmopan weather in September

In September, Belmopan sees average daytime highs of 32°C and overnight lows near 24°C, with 150 mm of rain across 24.9 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 32°C through the month. The sky is clear or mostly clear about 15% of the time in September, and the air most often feels miserable.

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

Daytime high
32°
4th warmest
Overnight low
24°
8th coldest
Rainfall
150 mm
24.9 wet days
Daylight
12 h 06 min
5:46 AM – 5:52 PM
Cloud cover
73%
11th clearest
Wind
7 km/h
11th windiest
Solar energy
4.87 kWh/m²
Travel score
2.7
out of 10

Belmopan is capital of Belize.

Founded
1970

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 32°C through the month.

A typical September day in Belmopan reaches about 32°C in the afternoon and slips back to 24°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 34°C. Set against its neighbours, September runs on par with August and about 2°C warmer than October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13224
23224
33224
43224
53224
63224
73224
83224
93224
103224
113224
123224
133224
143224
153224
163224
173224
183224
193224
203224
213124
223123
233123
243123
253123
263123
273123
283123
293123
303123

How September really feels in Belmopan

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.

Belmopan 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° / 19°6814.611.15.9
Feb29° / 20°3710.611.45.8
Mar30° / 21°389.511.95.1
Apr32° / 23°398.412.44.2
May33° / 24°9516.112.83.2
Jun31° / 24°16224.9132.7
Jul31° / 24°1262412.93.0
Aug32° / 24°12623.812.62.9
Sep32° / 24°15024.912.12.7
Oct30° / 23°16922.111.63.5
Nov28° / 21°12117.111.25.0
Dec27° / 20°7616.2115.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 15% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 69%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13862
23862
33664
43565
53565
63565
73367
83268
93268
103268
113268
123169
133169
143169
153070
163070
173070
182971
192971
202971
212872
222872
232872
242773
252674
262674
272575
282575
292575
302575

Chance of precipitation in September

Any precipitation

Belmopan gets around 150 mm of rain over 24.9 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 82% and peaks near 85% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
177
278
378
479
579
680
780
881
981
1081
1182
1282
1383
1483
1583
1683
1784
1884
1984
2084
2184
2285
2385
2485
2585
2685
2784
2884
2984
3083

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the miserable band about 52% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
104753
204753
304753
404654
504654
604654
704654
804654
904654
1004753
1104753
1204753
1304753
1404753
1504753
1604753
1704753
1804852
1904852
2004852
2104852
2204852
2314851
2414851
2514950
2614950
2714949
2825049
2925048
3025147

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

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 5:45 AM to 5:48 AM, and sunset from 6:05 PM to 5:40 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:456:05
212.35:456:04
312.35:456:03
412.35:456:03
512.35:456:02
612.35:456:01
712.25:456:00
812.25:455:59
912.25:465:58
1012.25:465:57
1112.25:465:57
1212.25:465:56
1312.15:465:55
1412.15:465:54
1512.15:465:53
1612.15:465:52
1712.15:475:51
1812.15:475:51
1912.05:475:50
2012.05:475:49
2112.05:475:48
2212.05:475:47
2312.05:475:46
2412.05:485:45
2511.95:485:44
2611.95:485:44
2711.95:485:43
2811.95:485:42
2911.95:485:41
3011.95:485:40

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.87 kWh/m².

For context, solar energy here swings from a low near 3.58 kWh/m² to a high of 5.98 kWh/m² in April across the year — September's 4.87 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.2Bright
55.2Bright
65.2Bright
75.2Bright
85.1Bright
95.1Bright
105.1Bright
115.0Bright
125.0Bright
135.0Bright
145.0Bright
154.9Bright
164.9Bright
174.8Bright
184.8Bright
194.8Bright
204.7Bright
214.7Bright
224.7Bright
234.6Bright
244.6Bright
254.5Bright
264.5Bright
274.5Bright
284.5Bright
294.4Bright
304.4Bright
Planning a trip in September

Hazard calendar for Belmopan

In seasonPeak

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

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

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

Is September a good time to visit Belmopan?

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
4.2
Beach & pool
12th-best month of the year

September is a weaker month for outdoor sightseeing in Belmopan.

What to pack for Belmopan in September

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

In September, Belmopan sees daytime highs around 32°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 25 days see rain.

light clothesrain gearsun protection

Sea temperature near Belmopan in September

The nearest coast averages about 30°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 69 km away) is warmest in September at about 30°C and coldest in January near 27°C.

The water stays above 20°C all year — warm enough for a swim any month.

26°28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan27Warm
Feb27Warm
Mar27Warm
Apr28Warm
May29Tropical
Jun29Tropical
Jul29Tropical
Aug29Tropical
Sep30Tropical
Oct29Tropical
Nov28Tropical
Dec27Warm

UV index in Belmopan 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 Belmopan peaks around April 10 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 8 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highApr 10UV 13Dec 15UV 8
UV index (midday)Level
Jan9Very high
Feb12Extreme
Mar13Extreme
Apr13Extreme
May11Extreme
Jun12Extreme
Jul12Extreme
Aug12Extreme
Sep12Extreme
Oct11Extreme
Nov8Very high
Dec8Very high

Air quality in Belmopan 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 Belmopan is worst in July — around 30 µg/m³ PM2.5 (moderate), about 5.4× the cleanest month (December, 6 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1030 µg/m³Dec 176 µg/m³
PM2.5 (µg/m³)Level
Jan6Good
Feb8Good
Mar10Good
Apr22Moderate
May28Moderate
Jun29Moderate
Jul30Moderate
Aug20Moderate
Sep14Moderate
Oct10Good
Nov6Good
Dec6Good
Location & terrain

Where is Belmopan?

Belmopan sits at 17.3°N, 88.8°W, 56 m above sea level, in Belize. The nearest listed city is San Ignacio, 34 km away.

San IgnacioMelchor de MencosCrooked TreeDangrigaBelize CityHopkinsPlacenciaOrange Walk

Topography around Belmopan

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

Within 3 km, the terrain around Belmopan has only modest variations in elevation — a maximum elevation change of 124 m around an average of 62 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 314 m; within 80 km, large variations in elevation — a maximum elevation change of 1,012 m.

The land around Belmopan is covered by trees (56%) and grassland (24%) within 3 km, trees (71%) within 16 km, and trees (67%) within 80 km.

3 km
124 m
16 km
314 m
80 km
1,012 m
treesgrasslandcroplandartificial surfaceswaterwetlandmangroves
September weather nearby: San Ignacio 34 km · Melchor de Mencos 46 km · Crooked Tree 63 km · Dangriga 65 km · Belize City 66 km · Hopkins 67 km · Placencia 92 km · Orange Walk 94 km

Belize travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / B / G
110 / 220 V · 60 Hz
Prices
≈ 53% of US
price level, 2025
GDP per capita
$7,865
2025
Happiness
6.7 / 10
World Happiness, 2025
Homicide rate
28.1
per 100k, 2022
Road deaths
22.6
per 100k/yr, 2019
Income group
Upper middle
World Bank
Religion
Roman Catholic 40%Protestant 32%none 16%other 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 Belmopan (17.2538°, -88.764°, elevation 56 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). 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).