San Ignacio weather in September

In September, San Ignacio sees average daytime highs of 32°C and overnight lows near 23°C, with 145 mm of rain across 23.7 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 oppressive.

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 San Ignacio's 11th-clearest and 12th-windiest month. For the whole year in context, see San Ignacio's year-round climate.

Daytime high: 32°; 4th warmest
Overnight low: 23°; 8th coldest
Rainfall: 145 mm; 23.7 wet days
Daylight: 12 h 06 min; 5:48 AM – 5:53 PM
Cloud cover: 73%; 11th clearest
Wind: 7 km/h; 12th windiest
Solar energy: 4.92 kWh/m²
Travel score: 2.5; out of 10

San Ignacio is capital of the Cayo district.

Density: 2,104/km²; people per km²
Founded: 1800

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

← August San Ignacio 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 32°C through the month.

A typical September day in San Ignacio reaches about 32°C in the afternoon and slips back to 23°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 35°C. Set against its neighbours, September runs on par with August and about 2°C warmer than 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)	33	33	33	33	33	33	33	33	33	33	33	33	33	33	33	33	33	32	32	32	32	32	32	32	32	32	32	32	32	31
Avg low (°C)	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23

	Avg high (°C)	Avg low (°C)
1	33	23
2	33	23
3	33	23
4	33	23
5	33	23
6	33	23
7	33	23
8	33	23
9	33	23
10	33	23
11	33	23
12	33	23
13	33	23
14	33	23
15	33	23
16	33	23
17	33	23
18	32	23
19	32	23
20	32	23
21	32	23
22	32	23
23	32	23
24	32	23
25	32	23
26	32	23
27	32	23
28	32	23
29	32	23
30	31	23

How September really feels in San Ignacio

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 Ignacio 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.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	28° / 19°	50	13	11.1	6.0
Feb	29° / 19°	30	8.9	11.4	5.5
Mar	32° / 20°	33	8.2	11.9	4.5
Apr	34° / 22°	38	7.3	12.4	3.5
May	34° / 24°	89	13.9	12.8	2.8
Jun	32° / 24°	151	22.7	13	2.7
Jul	32° / 23°	98	21.4	12.9	3.0
Aug	33° / 23°	112	20.4	12.6	2.7
Sep	32° / 23°	145	23.7	12.1	2.5
Oct	30° / 22°	148	21.6	11.6	3.4
Nov	29° / 20°	98	15.6	11.2	4.9
Dec	28° / 19°	57	13.6	11	5.8

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 70%. Skies tend to cloud over as the month goes on.

	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 (%)	37	37	34	34	34	33	33	32	32	32	32	31	30	30	30	30	30	30	30	30	29	29	28	28	27	27	27	27	25	25
Cloudier (%)	63	63	66	66	66	67	67	68	68	68	68	69	70	70	70	70	70	70	70	70	71	71	72	72	73	73	73	73	75	75

	Clearer (%)	Cloudier (%)
1	37	63
2	37	63
3	34	66
4	34	66
5	34	66
6	33	67
7	33	67
8	32	68
9	32	68
10	32	68
11	32	68
12	31	69
13	30	70
14	30	70
15	30	70
16	30	70
17	30	70
18	30	70
19	30	70
20	30	70
21	29	71
22	29	71
23	28	72
24	28	72
25	27	73
26	27	73
27	27	73
28	27	73
29	25	75
30	25	75

Chance of precipitation in September

Any precipitation

San Ignacio gets around 145 mm of rain over 23.7 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 78% and peaks near 83% on the wettest days. The odds climb toward the end of the month.

	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 (%)	73	73	74	74	75	75	76	76	76	76	76	76	76	76	76	77	77	78	78	79	80	80	81	82	82	82	83	83	82	82

	Rain chance (%)
1	73
2	73
3	74
4	74
5	75
6	75
7	76
8	76
9	76
10	76
11	76
12	76
13	76
14	76
15	76
16	77
17	77
18	78
19	78
20	79
21	80
22	80
23	81
24	82
25	82
26	82
27	83
28	83
29	82
30	82

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 68% 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
Muggy (%)	1	1	1	1	1	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1	1	2	2	2	3
Oppressive (%)	70	70	70	69	69	69	70	70	69	69	68	68	68	67	67	67	66	66	66	66	67	66	66	67	67	68	68	68	68	68
Miserable (%)	29	29	29	30	30	30	30	30	31	31	32	32	32	33	33	33	34	34	34	34	33	33	33	32	32	31	30	30	30	29

	Muggy (%)	Oppressive (%)	Miserable (%)
1	1	70	29
2	1	70	29
3	1	70	29
4	1	69	30
5	1	69	30
6	1	69	30
7	0	70	30
8	0	70	30
9	0	69	31
10	0	69	31
11	0	68	32
12	0	68	32
13	0	68	32
14	0	67	33
15	0	67	33
16	0	67	33
17	0	66	34
18	0	66	34
19	0	66	34
20	0	66	34
21	0	67	33
22	1	66	33
23	1	66	33
24	1	67	32
25	1	67	32
26	1	68	31
27	2	68	30
28	2	68	30
29	2	68	30
30	3	68	29

Wind in September

Winds average 7 km/h in September, the calmest month.

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.

	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	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7
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	7	calm
3	7	calm
4	7	calm
5	7	calm
6	7	calm
7	7	calm
8	7	calm
9	7	calm
10	7	calm
11	7	calm
12	7	calm
13	7	calm
14	7	calm
15	7	calm
16	7	calm
17	7	calm
18	7	calm
19	7	calm
20	7	calm
21	7	calm
22	7	calm
23	7	calm
24	7	calm
25	7	calm
26	7	calm
27	7	calm
28	7	calm
29	7	calm
30	7	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 5:46 AM to 5:50 AM, and sunset from 6:06 PM to 5:41 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	12.3	12.3	12.2	12.2	12.2	12.2	12.2	12.2	12.1	12.1	12.1	12.1	12.1	12.1	12.0	12.0	12.0	12.0	12.0	12.0	11.9	11.9	11.9	11.9	11.9	11.9
Sunrise (AM)	5:46	5:46	5:46	5:46	5:46	5:46	5:47	5:47	5:47	5:47	5:47	5:47	5:47	5:47	5:48	5:48	5:48	5:48	5:48	5:48	5:48	5:49	5:49	5:49	5:49	5:49	5:49	5:49	5:50	5:50
Sunset (PM)	6:06	6:05	6:05	6:04	6:03	6:02	6:01	6:00	6:00	5:59	5:58	5:57	5:56	5:55	5:54	5:53	5:53	5:52	5:51	5:50	5:49	5:48	5:47	5:47	5:46	5:45	5:44	5:43	5:42	5:41

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.3	5:46	6:06
2	12.3	5:46	6:05
3	12.3	5:46	6:05
4	12.3	5:46	6:04
5	12.3	5:46	6:03
6	12.3	5:46	6:02
7	12.2	5:47	6:01
8	12.2	5:47	6:00
9	12.2	5:47	6:00
10	12.2	5:47	5:59
11	12.2	5:47	5:58
12	12.2	5:47	5:57
13	12.1	5:47	5:56
14	12.1	5:47	5:55
15	12.1	5:48	5:54
16	12.1	5:48	5:53
17	12.1	5:48	5:53
18	12.1	5:48	5:52
19	12.0	5:48	5:51
20	12.0	5:48	5:50
21	12.0	5:48	5:49
22	12.0	5:49	5:48
23	12.0	5:49	5:47
24	12.0	5:49	5:47
25	11.9	5:49	5:46
26	11.9	5:49	5:45
27	11.9	5:49	5:44
28	11.9	5:49	5:43
29	11.9	5:50	5:42
30	11.9	5:50	5:41

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.92 kWh/m².

For context, solar energy here swings from a low near 3.62 kWh/m² to a high of 6.02 kWh/m² in April across the year — September's 4.92 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)	5.3	5.3	5.3	5.3	5.3	5.2	5.2	5.2	5.2	5.1	5.1	5.1	5.0	5.0	5.0	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	4.4
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	5.3	Bright
2	5.3	Bright
3	5.3	Bright
4	5.3	Bright
5	5.3	Bright
6	5.2	Bright
7	5.2	Bright
8	5.2	Bright
9	5.2	Bright
10	5.1	Bright
11	5.1	Bright
12	5.1	Bright
13	5.0	Bright
14	5.0	Bright
15	5.0	Bright
16	4.9	Bright
17	4.9	Bright
18	4.8	Bright
19	4.8	Bright
20	4.8	Bright
21	4.7	Bright
22	4.7	Bright
23	4.7	Bright
24	4.6	Bright
25	4.6	Bright
26	4.5	Bright
27	4.5	Bright
28	4.5	Bright
29	4.5	Bright
30	4.4	Bright

Planning a trip in September

Is September a good time to visit San Ignacio?

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

2.5

Sightseeing

12th-best month of the year

4.2

Beach & pool

12th-best month of the year

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

What to pack for San Ignacio in September

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

In September, San Ignacio sees daytime highs around 32°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 24 days see rain.

light clothesrain gearsun protection

UV index in San Ignacio 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 Ignacio 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.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	9	12	13	13	10	13	12	12	12	11	8	8
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	12	Extreme
Mar	13	Extreme
Apr	13	Extreme
May	10	Extreme
Jun	13	Extreme
Jul	12	Extreme
Aug	12	Extreme
Sep	12	Extreme
Oct	11	Extreme
Nov	8	Very high
Dec	8	Very high

Air quality in San Ignacio 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 Ignacio is worst in May — around 30 µg/m³ PM2.5 (moderate), about 5.2× the cleanest month (December, 6 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)	6	7	10	28	30	26	28	19	14	10	7	6
Level	Good	Good	Good	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Good	Good	Good

	PM2.5 (µg/m³)	Level
Jan	6	Good
Feb	7	Good
Mar	10	Good
Apr	28	Moderate
May	30	Moderate
Jun	26	Moderate
Jul	28	Moderate
Aug	19	Moderate
Sep	14	Moderate
Oct	10	Good
Nov	7	Good
Dec	6	Good

Location & terrain

Where is San Ignacio?

San Ignacio sits at 17.2°N, 89.1°W, 0 m above sea level, in Belize. The nearest listed city is Melchor de Mencos, 14 km away.

Topography around San Ignacio

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

Within 3 km, the terrain around San Ignacio has only modest variations in elevation — a maximum elevation change of 131 m around an average of 92 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 451 m; within 80 km, large variations in elevation — a maximum elevation change of 1,118 m.

The land around San Ignacio is covered by trees (55%) and grassland (24%) within 3 km, trees (66%) and grassland (29%) within 16 km, and trees (79%) within 80 km.

3 km

131 m

trees 55%

16 km

451 m

trees 66%

80 km

1,118 m

trees 79%

treesgrasslandcroplandartificial surfaceswaterwetland

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

September weather nearby: Melchor de Mencos 14 km · Belmopan 34 km · Crooked Tree 89 km · Hopkins 90 km · Dangriga 91 km · Flores 92 km · San Benito 94 km · Poptún 99 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

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 Ignacio (17.1588°, -89.0696°, 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. 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	33	23
2	33	23
3	33	23
4	33	23
5	33	23
6	33	23
7	33	23
8	33	23
9	33	23
10	33	23
11	33	23
12	33	23
13	33	23
14	33	23
15	33	23
16	33	23
17	33	23
18	32	23
19	32	23
20	32	23
21	32	23
22	32	23
23	32	23
24	32	23
25	32	23
26	32	23
27	32	23
28	32	23
29	32	23
30	31	23

	Clearer (%)	Cloudier (%)
1	37	63
2	37	63
3	34	66
4	34	66
5	34	66
6	33	67
7	33	67
8	32	68
9	32	68
10	32	68
11	32	68
12	31	69
13	30	70
14	30	70
15	30	70
16	30	70
17	30	70
18	30	70
19	30	70
20	30	70
21	29	71
22	29	71
23	28	72
24	28	72
25	27	73
26	27	73
27	27	73
28	27	73
29	25	75
30	25	75

	Rain chance (%)
1	73
2	73
3	74
4	74
5	75
6	75
7	76
8	76
9	76
10	76
11	76
12	76
13	76
14	76
15	76
16	77
17	77
18	78
19	78
20	79
21	80
22	80
23	81
24	82
25	82
26	82
27	83
28	83
29	82
30	82

	Muggy (%)	Oppressive (%)	Miserable (%)
1	1	70	29
2	1	70	29
3	1	70	29
4	1	69	30
5	1	69	30
6	1	69	30
7	0	70	30
8	0	70	30
9	0	69	31
10	0	69	31
11	0	68	32
12	0	68	32
13	0	68	32
14	0	67	33
15	0	67	33
16	0	67	33
17	0	66	34
18	0	66	34
19	0	66	34
20	0	66	34
21	0	67	33
22	1	66	33
23	1	66	33
24	1	67	32
25	1	67	32
26	1	68	31
27	2	68	30
28	2	68	30
29	2	68	30
30	3	68	29

	Avg high (°C)	Avg low (°C)
1	33	23
2	33	23
3	33	23
4	33	23
5	33	23
6	33	23
7	33	23
8	33	23
9	33	23
10	33	23
11	33	23
12	33	23
13	33	23
14	33	23
15	33	23
16	33	23
17	33	23
18	32	23
19	32	23
20	32	23
21	32	23
22	32	23
23	32	23
24	32	23
25	32	23
26	32	23
27	32	23
28	32	23
29	32	23
30	31	23

	Clearer (%)	Cloudier (%)
1	37	63
2	37	63
3	34	66
4	34	66
5	34	66
6	33	67
7	33	67
8	32	68
9	32	68
10	32	68
11	32	68
12	31	69
13	30	70
14	30	70
15	30	70
16	30	70
17	30	70
18	30	70
19	30	70
20	30	70
21	29	71
22	29	71
23	28	72
24	28	72
25	27	73
26	27	73
27	27	73
28	27	73
29	25	75
30	25	75

	Rain chance (%)
1	73
2	73
3	74
4	74
5	75
6	75
7	76
8	76
9	76
10	76
11	76
12	76
13	76
14	76
15	76
16	77
17	77
18	78
19	78
20	79
21	80
22	80
23	81
24	82
25	82
26	82
27	83
28	83
29	82
30	82

	Muggy (%)	Oppressive (%)	Miserable (%)
1	1	70	29
2	1	70	29
3	1	70	29
4	1	69	30
5	1	69	30
6	1	69	30
7	0	70	30
8	0	70	30
9	0	69	31
10	0	69	31
11	0	68	32
12	0	68	32
13	0	68	32
14	0	67	33
15	0	67	33
16	0	67	33
17	0	66	34
18	0	66	34
19	0	66	34
20	0	66	34
21	0	67	33
22	1	66	33
23	1	66	33
24	1	67	32
25	1	67	32
26	1	68	31
27	2	68	30
28	2	68	30
29	2	68	30
30	3	68	29

	Avg high (°C)	Avg low (°C)
1	33	23
2	33	23
3	33	23
4	33	23
5	33	23
6	33	23
7	33	23
8	33	23
9	33	23
10	33	23
11	33	23
12	33	23
13	33	23
14	33	23
15	33	23
16	33	23
17	33	23
18	32	23
19	32	23
20	32	23
21	32	23
22	32	23
23	32	23
24	32	23
25	32	23
26	32	23
27	32	23
28	32	23
29	32	23
30	31	23

	Clearer (%)	Cloudier (%)
1	37	63
2	37	63
3	34	66
4	34	66
5	34	66
6	33	67
7	33	67
8	32	68
9	32	68
10	32	68
11	32	68
12	31	69
13	30	70
14	30	70
15	30	70
16	30	70
17	30	70
18	30	70
19	30	70
20	30	70
21	29	71
22	29	71
23	28	72
24	28	72
25	27	73
26	27	73
27	27	73
28	27	73
29	25	75
30	25	75

	Rain chance (%)
1	73
2	73
3	74
4	74
5	75
6	75
7	76
8	76
9	76
10	76
11	76
12	76
13	76
14	76
15	76
16	77
17	77
18	78
19	78
20	79
21	80
22	80
23	81
24	82
25	82
26	82
27	83
28	83
29	82
30	82

	Muggy (%)	Oppressive (%)	Miserable (%)
1	1	70	29
2	1	70	29
3	1	70	29
4	1	69	30
5	1	69	30
6	1	69	30
7	0	70	30
8	0	70	30
9	0	69	31
10	0	69	31
11	0	68	32
12	0	68	32
13	0	68	32
14	0	67	33
15	0	67	33
16	0	67	33
17	0	66	34
18	0	66	34
19	0	66	34
20	0	66	34
21	0	67	33
22	1	66	33
23	1	66	33
24	1	67	32
25	1	67	32
26	1	68	31
27	2	68	30
28	2	68	30
29	2	68	30
30	3	68	29