San Pedro weather in September

In September, San Pedro sees average daytime highs of 29°C and overnight lows near 27°C, with 216 mm of rain across 24.7 wet days and about 12.1 hours of daylight. It is the 1st-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 30% of the time in September, and the air most often feels miserable.

Daylight stretches from about 12 h 24 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 Pedro's 11th-clearest and 12th-windiest month. For the whole year in context, see San Pedro's year-round climate.

Daytime high
29°
1st warmest
Overnight low
27°
9th coldest
Rainfall
216 mm
24.7 wet days
Daylight
12 h 06 min
5:43 AM – 5:49 PM
Cloud cover
62%
11th clearest
Wind
18 km/h
12th windiest
Solar energy
5.53 kWh/m²
Travel score
3.8
out of 10

San Pedro is town in Belize.

Density
245/km²
people per km²
Founded
1848

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 29°C through the month.

A typical September day in San Pedro reaches about 29°C in the afternoon and slips back to 27°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 29°C. Set against its neighbours, September runs on par with August and on par with October.

24°26°28°30°32°151015202530
Avg high (°C)Avg low (°C)
12927
22927
32927
42927
52927
62927
72927
82927
92927
102927
112927
122927
132927
142927
152927
162927
172927
182927
192827
202826
212826
222826
232826
242826
252826
262826
272826
282826
292826
302826

How September really feels in San Pedro

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.

San Pedro weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 24°9415.5116.3
Feb26° / 24°388.811.47.3
Mar26° / 25°357.711.97.6
Apr27° / 26°327.112.47.4
May28° / 27°10414.212.86.0
Jun28° / 27°20421.113.14.3
Jul28° / 27°14220.7134.6
Aug29° / 27°18022.412.64.3
Sep29° / 27°21624.712.13.8
Oct28° / 26°2802311.64.4
Nov27° / 25°17918.811.25.4
Dec26° / 24°10317.410.95.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 56%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15347
25248
35248
45050
54951
64951
74852
84852
94852
104654
114654
124654
134456
144456
154357
164357
174357
184258
194159
204159
214159
224258
234159
244159
254060
264060
273961
283961
293961
303862

Chance of precipitation in September

Any precipitation

San Pedro gets around 216 mm of rain over 24.7 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 81% and peaks near 86% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
175
275
375
475
576
676
777
877
978
1078
1179
1280
1380
1481
1582
1682
1783
1884
1984
2085
2185
2286
2386
2486
2586
2686
2786
2885
2985
3084

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 82% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
101090
201090
301189
401189
501189
601189
701288
801288
901288
1001387
1101387
1201387
1301486
1401585
1501585
1601684
1701783
1801882
1901882
2002080
2102179
2202278
2302377
2402575
2502674
2602773
2712970
2813069
2913168
3013267

Wind in September

Winds average 18 km/h in September, the calmest month.

Across September, daily wind ranges from about 17 km/h on the calmest days to 19 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202530
Wind speed (km/h)Feels
119light breeze
219light breeze
319light breeze
418light breeze
518light breeze
618light breeze
718light breeze
818light breeze
918light breeze
1018light breeze
1118light breeze
1218light breeze
1318light breeze
1418light breeze
1518light breeze
1618light breeze
1718light breeze
1817light breeze
1917light breeze
2017light breeze
2117light breeze
2217light breeze
2317light breeze
2417light breeze
2517light breeze
2617light breeze
2717light breeze
2817light breeze
2917light breeze
3017light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 24 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 30 minutes over September. Sunrise moves from 5:41 AM to 5:45 AM, and sunset from 6:02 PM to 5:37 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:416:02
212.35:416:01
312.35:416:01
412.35:416:00
512.35:425:59
612.35:425:58
712.35:425:57
812.25:425:56
912.25:425:55
1012.25:425:55
1112.25:425:54
1212.25:435:53
1312.25:435:52
1412.15:435:51
1512.15:435:50
1612.15:435:49
1712.15:435:48
1812.15:435:47
1912.05:445:47
2012.05:445:46
2112.05:445:45
2212.05:445:44
2312.05:445:43
2412.05:445:42
2511.95:455:41
2611.95:455:40
2711.95:455:39
2811.95:455:39
2911.95:455:38
3011.95:455:37

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.53 kWh/m².

For context, solar energy here swings from a low near 4.05 kWh/m² to a high of 6.57 kWh/m² in April across the year — September's 5.53 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.0Bright
26.0Bright
35.9Bright
45.9Bright
55.9Bright
65.9Bright
75.8Bright
85.8Bright
95.8Bright
105.8Bright
115.7Bright
125.7Bright
135.6Bright
145.6Bright
155.6Bright
165.5Bright
175.5Bright
185.4Bright
195.4Bright
205.3Bright
215.3Bright
225.3Bright
235.2Bright
245.2Bright
255.2Bright
265.1Bright
275.1Bright
285.1Bright
295.0Bright
305.0Bright
Planning a trip in September

Hazard calendar for San Pedro

In seasonPeak

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

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

San Pedro's rainy season runs June–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 Pedro?

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

3.8
Sightseeing
12th-best month of the year
4.6
Beach & pool
12th-best month of the year

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

What to pack for San Pedro in September

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

In September, San Pedro sees daytime highs around 29°C and nights near 27°C. Pack light clothes and rain gear. Worth having: sun protection. About 25 days see rain.

light clothesrain gearsun protection

Sea temperature near San Pedro 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 offshore 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
May28Tropical
Jun29Tropical
Jul29Tropical
Aug29Tropical
Sep30Tropical
Oct29Tropical
Nov28Tropical
Dec27Warm

UV index in San Pedro 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 Pedro peaks around April 11 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 7 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highApr 11UV 13Dec 16UV 7
UV index (midday)Level
Jan8Very high
Feb11Extreme
Mar12Extreme
Apr13Extreme
May11Extreme
Jun13Extreme
Jul12Extreme
Aug12Extreme
Sep12Extreme
Oct10Extreme
Nov8Very high
Dec7Very high

Air quality in San Pedro 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 Pedro is worst in July — around 31 µg/m³ PM2.5 (moderate), about 5.0× the cleanest month (December, 6 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1131 µg/m³Dec 116 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb10Good
Mar9Good
Apr14Moderate
May19Moderate
Jun30Moderate
Jul31Moderate
Aug22Moderate
Sep14Moderate
Oct9Good
Nov6Good
Dec6Good
Location & terrain

Where is San Pedro?

San Pedro sits at 17.9°N, 88.0°W, 4 m above sea level, in Belize. The nearest listed city is Caye Caulker, 21 km away.

Caye CaulkerBelize CityCrooked TreeOrange WalkChetumalDangrigaBelmopan

Topography around San Pedro

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

Within 3 km, the terrain around San Pedro has only modest variations in elevation — a maximum elevation change of 9 m around an average of 0 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 12 m; within 80 km, only modest variations in elevation — a maximum elevation change of 93 m.

The land around San Pedro is covered by water (79%) within 3 km, water (94%) within 16 km, and water (63%) within 80 km.

3 km
9 m
16 km
12 m
80 km
93 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetlandmangroves
September weather nearby: Caye Caulker 21 km · Belize City 52 km · Crooked Tree 63 km · Orange Walk 66 km · Chetumal 76 km · Bacalar 96 km · Dangriga 109 km · Belmopan 112 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 San Pedro (17.916°, -87.9659°, elevation 4 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).