Celaya weather in September

In September, Celaya sees average daytime highs of 26°C and overnight lows near 15°C, with 115 mm of rain across 14 wet days and about 12.1 hours of daylight. It is the 7th-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 26°C through the month. The sky is clear or mostly clear about 17% of the time in September, and the air most often feels comfortable.

Daylight stretches from about 12 h 24 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Celaya's 12th-clearest and 5th-windiest month. For the whole year in context, see Celaya's year-round climate.

Daytime high: 26°; 7th warmest
Overnight low: 15°; 8th coldest
Rainfall: 115 mm; 14 wet days
Daylight: 12 h 06 min; 6:34 AM – 6:41 PM
Cloud cover: 68%; 12th clearest
Wind: 8 km/h; 5th windiest
Solar energy: 5.45 kWh/m²
Travel score: 5.9; out of 10

Celaya is municipal seat of Celaya, State of Guanajuato, Mexico.

Air quality: Elevated; PM10 66 µg/m³ · 2018
Density: 615/km²; people per km²
Founded: 1570

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

← August Celaya 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 26°C through the month.

A typical September day in Celaya reaches about 26°C in the afternoon and slips back to 15°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 29°C. Set against its neighbours, September runs about 1°C cooler than 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)	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26	26
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	14	14	14	14	14	14	14

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

Celaya weather by month

How September compares with the rest of the year at a glance. September is the 7th-warmest and 4th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	24° / 8°	10	2.2	10.9	8.5
Feb	26° / 9°	12	1.8	11.3	8.5
Mar	28° / 11°	10	2	11.9	7.5
Apr	30° / 13°	12	2.7	12.5	5.9
May	31° / 15°	46	7.6	13	5.1
Jun	29° / 16°	126	13.6	13.2	5.1
Jul	27° / 15°	135	17.2	13.1	5.5
Aug	27° / 15°	122	15.4	12.7	5.6
Sep	26° / 15°	115	14	12.1	5.9
Oct	26° / 13°	42	7	11.5	7.2
Nov	25° / 10°	13	2.7	11	8.3
Dec	24° / 8°	4	1	10.8	8.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 17% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 20% of September, with mostly cloudy or overcast conditions the remaining 64%. Skies tend to open up 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 (%)	34	33	33	34	33	34	34	34	35	35	37	37	36	37	37	37	36	37	38	37	37	36	37	37	38	38	39	40	40	41
Cloudier (%)	66	67	67	66	67	66	66	66	65	65	63	63	64	63	63	63	64	63	62	63	63	64	63	63	62	62	61	60	60	59

	Clearer (%)	Cloudier (%)
1	34	66
2	33	67
3	33	67
4	34	66
5	33	67
6	34	66
7	34	66
8	34	66
9	35	65
10	35	65
11	37	63
12	37	63
13	36	64
14	37	63
15	37	63
16	37	63
17	36	64
18	37	63
19	38	62
20	37	63
21	37	63
22	36	64
23	37	63
24	37	63
25	38	62
26	38	62
27	39	61
28	40	60
29	40	60
30	41	59

Chance of precipitation in September

Any precipitation

Celaya gets around 115 mm of rain over 14 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 46% and peaks near 54% on the wettest days. The odds ease 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 (%)	54	54	54	54	54	54	54	54	53	53	52	52	51	50	49	48	47	46	44	43	42	40	38	37	35	34	33	32	31	30

	Rain chance (%)
1	54
2	54
3	54
4	54
5	54
6	54
7	54
8	54
9	53
10	53
11	52
12	52
13	51
14	50
15	49
16	48
17	47
18	46
19	44
20	43
21	42
22	40
23	38
24	37
25	35
26	34
27	33
28	32
29	31
30	30

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the comfortable band about 51% 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 (%)	28	28	28	28	28	28	29	29	29	30	30	30	31	32	32	33	33	34	35	36	37	39	41	42	44	46	48	49	51	53
Comfortable (%)	58	57	57	57	57	57	56	55	55	54	54	54	53	52	53	52	52	52	51	51	50	49	48	47	45	44	43	42	41	40
Humid (%)	14	15	15	15	15	15	15	16	16	16	16	16	16	16	15	15	15	14	14	13	13	12	12	11	10	10	9	9	8	7

	Dry (%)	Comfortable (%)	Humid (%)
1	28	58	14
2	28	57	15
3	28	57	15
4	28	57	15
5	28	57	15
6	28	57	15
7	29	56	15
8	29	55	16
9	29	55	16
10	30	54	16
11	30	54	16
12	30	54	16
13	31	53	16
14	32	52	16
15	32	53	15
16	33	52	15
17	33	52	15
18	34	52	14
19	35	51	14
20	36	51	13
21	37	50	13
22	39	49	12
23	41	48	12
24	42	47	11
25	44	45	10
26	46	44	10
27	48	43	9
28	49	42	9
29	51	41	8
30	53	40	7

Wind in September

Winds average 8 km/h in September.

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

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 24 min at the start of September to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 36 minutes over September. Sunrise moves from 6:31 AM to 6:38 AM, and sunset from 6:55 PM to 6:28 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)	12.4	12.4	12.4	12.4	12.3	12.3	12.3	12.3	12.3	12.2	12.2	12.2	12.2	12.2	12.1	12.1	12.1	12.1	12.1	12.0	12.0	12.0	12.0	12.0	11.9	11.9	11.9	11.9	11.9	11.8
Sunrise (AM)	6:31	6:31	6:31	6:31	6:32	6:32	6:32	6:32	6:33	6:33	6:33	6:33	6:33	6:34	6:34	6:34	6:34	6:35	6:35	6:35	6:35	6:36	6:36	6:36	6:36	6:36	6:37	6:37	6:37	6:38
Sunset (PM)	6:55	6:54	6:53	6:53	6:52	6:51	6:50	6:49	6:48	6:47	6:46	6:45	6:44	6:43	6:42	6:41	6:40	6:39	6:38	6:37	6:36	6:35	6:34	6:33	6:32	6:31	6:30	6:29	6:29	6:28

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.4	6:31	6:55
2	12.4	6:31	6:54
3	12.4	6:31	6:53
4	12.4	6:31	6:53
5	12.3	6:32	6:52
6	12.3	6:32	6:51
7	12.3	6:32	6:50
8	12.3	6:32	6:49
9	12.3	6:33	6:48
10	12.2	6:33	6:47
11	12.2	6:33	6:46
12	12.2	6:33	6:45
13	12.2	6:33	6:44
14	12.2	6:34	6:43
15	12.1	6:34	6:42
16	12.1	6:34	6:41
17	12.1	6:34	6:40
18	12.1	6:35	6:39
19	12.1	6:35	6:38
20	12.0	6:35	6:37
21	12.0	6:35	6:36
22	12.0	6:36	6:35
23	12.0	6:36	6:34
24	12.0	6:36	6:33
25	11.9	6:36	6:32
26	11.9	6:36	6:31
27	11.9	6:37	6:30
28	11.9	6:37	6:29
29	11.9	6:37	6:29
30	11.8	6:38	6:28

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.45 kWh/m².

For context, solar energy here swings from a low near 4.84 kWh/m² to a high of 7.46 kWh/m² in April across the year — September's 5.45 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)	5.7	5.7	5.7	5.6	5.6	5.6	5.6	5.6	5.5	5.5	5.5	5.5	5.5	5.5	5.5	5.5	5.5	5.5	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.3
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	5.7	Bright
2	5.7	Bright
3	5.7	Bright
4	5.6	Bright
5	5.6	Bright
6	5.6	Bright
7	5.6	Bright
8	5.6	Bright
9	5.5	Bright
10	5.5	Bright
11	5.5	Bright
12	5.5	Bright
13	5.5	Bright
14	5.5	Bright
15	5.5	Bright
16	5.5	Bright
17	5.5	Bright
18	5.5	Bright
19	5.4	Bright
20	5.4	Bright
21	5.4	Bright
22	5.4	Bright
23	5.4	Bright
24	5.4	Bright
25	5.4	Bright
26	5.4	Bright
27	5.4	Bright
28	5.4	Bright
29	5.4	Bright
30	5.3	Bright

Planning a trip in September

Hazard calendar for Celaya

In seasonPeak

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

Celaya's rainy season runs June–September, 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 Celaya?

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

5.9

Sightseeing

7th-best month of the year

5.7

Beach & pool

10th-best month of the year

September is a reasonable time to visit Celaya for sightseeing.

What to pack for Celaya in September

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

In September, Celaya sees daytime highs around 26°C and nights near 15°C. Pack rain gear. Worth having: light clothes and sun protection. About 14 days see rain.

rain gearlight clothessun protection

UV index in Celaya in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Celaya peaks around June 14 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 7 (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)	8	10	13	13	13	14	12	13	11	11	8	7
Level	Very high	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Very high

	UV index (midday)	Level
Jan	8	Very high
Feb	10	Extreme
Mar	13	Extreme
Apr	13	Extreme
May	13	Extreme
Jun	14	Extreme
Jul	12	Extreme
Aug	13	Extreme
Sep	11	Extreme
Oct	11	Extreme
Nov	8	Very high
Dec	7	Very high

Air quality in Celaya 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 Celaya is worst in May — around 24 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)	22	22	19	22	24	18	22	18	18	16	19	22
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	22	Moderate
Feb	22	Moderate
Mar	19	Moderate
Apr	22	Moderate
May	24	Moderate
Jun	18	Moderate
Jul	22	Moderate
Aug	18	Moderate
Sep	18	Moderate
Oct	16	Moderate
Nov	19	Moderate
Dec	22	Moderate

Location & terrain

Where is Celaya?

Celaya sits at 20.5°N, 100.8°W, 1,766 m above sea level, in Mexico. The nearest listed city is Apaseo el Grande, 13 km away.

Topography around Celaya

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

Within 3 km, the terrain around Celaya has only modest variations in elevation — a maximum elevation change of 31 m around an average of 1,756 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 824 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,651 m.

The land around Celaya is covered by artificial surfaces (83%) within 3 km, cropland (39%) within 16 km, and cropland (34%) and shrubs (29%) within 80 km.

3 km

31 m

artificial surfaces 83%

16 km

824 m

cropland 39%

80 km

1,651 m

cropland 34%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwater

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

September weather nearby: Apaseo el Grande 13 km · Cortazar 16 km · Villagrán 19 km · Apaseo el Alto 21 km · Comonfort 23 km · Juventino Rosas 23 km · Jaral del Progreso 31 km · Salvatierra 35 km

Mexico travel facts

Travel advisory: Level 2; Exercise Increased Caution
Power plugs: Type A / B; 120 / 127 V · 60 Hz
Prices: ≈ 54% of US; price level, 2025
GDP per capita: $13,889; 2025
Happiness: 7.0 / 10; World Happiness, 2025
Safe drinking water: 43%; of population, 2024
Homicide rate: 24.9; per 100k, 2023
Road deaths: 12.8; per 100k/yr, 2019
Income group: Upper middle; World Bank
English: Very low; EF EPI 440
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 Celaya (20.5218°, -100.814°, elevation 1,766 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	26	15
2	26	15
3	26	15
4	26	15
5	26	15
6	26	15
7	26	15
8	26	15
9	26	15
10	26	15
11	26	15
12	26	15
13	26	15
14	26	15
15	26	15
16	26	15
17	26	15
18	26	15
19	26	15
20	26	15
21	26	15
22	26	15
23	26	15
24	26	14
25	26	14
26	26	14
27	26	14
28	26	14
29	26	14
30	26	14

	Clearer (%)	Cloudier (%)
1	34	66
2	33	67
3	33	67
4	34	66
5	33	67
6	34	66
7	34	66
8	34	66
9	35	65
10	35	65
11	37	63
12	37	63
13	36	64
14	37	63
15	37	63
16	37	63
17	36	64
18	37	63
19	38	62
20	37	63
21	37	63
22	36	64
23	37	63
24	37	63
25	38	62
26	38	62
27	39	61
28	40	60
29	40	60
30	41	59

	Rain chance (%)
1	54
2	54
3	54
4	54
5	54
6	54
7	54
8	54
9	53
10	53
11	52
12	52
13	51
14	50
15	49
16	48
17	47
18	46
19	44
20	43
21	42
22	40
23	38
24	37
25	35
26	34
27	33
28	32
29	31
30	30

	Dry (%)	Comfortable (%)	Humid (%)
1	28	58	14
2	28	57	15
3	28	57	15
4	28	57	15
5	28	57	15
6	28	57	15
7	29	56	15
8	29	55	16
9	29	55	16
10	30	54	16
11	30	54	16
12	30	54	16
13	31	53	16
14	32	52	16
15	32	53	15
16	33	52	15
17	33	52	15
18	34	52	14
19	35	51	14
20	36	51	13
21	37	50	13
22	39	49	12
23	41	48	12
24	42	47	11
25	44	45	10
26	46	44	10
27	48	43	9
28	49	42	9
29	51	41	8
30	53	40	7

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

	Clearer (%)	Cloudier (%)
1	34	66
2	33	67
3	33	67
4	34	66
5	33	67
6	34	66
7	34	66
8	34	66
9	35	65
10	35	65
11	37	63
12	37	63
13	36	64
14	37	63
15	37	63
16	37	63
17	36	64
18	37	63
19	38	62
20	37	63
21	37	63
22	36	64
23	37	63
24	37	63
25	38	62
26	38	62
27	39	61
28	40	60
29	40	60
30	41	59

	Rain chance (%)
1	54
2	54
3	54
4	54
5	54
6	54
7	54
8	54
9	53
10	53
11	52
12	52
13	51
14	50
15	49
16	48
17	47
18	46
19	44
20	43
21	42
22	40
23	38
24	37
25	35
26	34
27	33
28	32
29	31
30	30

	Dry (%)	Comfortable (%)	Humid (%)
1	28	58	14
2	28	57	15
3	28	57	15
4	28	57	15
5	28	57	15
6	28	57	15
7	29	56	15
8	29	55	16
9	29	55	16
10	30	54	16
11	30	54	16
12	30	54	16
13	31	53	16
14	32	52	16
15	32	53	15
16	33	52	15
17	33	52	15
18	34	52	14
19	35	51	14
20	36	51	13
21	37	50	13
22	39	49	12
23	41	48	12
24	42	47	11
25	44	45	10
26	46	44	10
27	48	43	9
28	49	42	9
29	51	41	8
30	53	40	7

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

	Clearer (%)	Cloudier (%)
1	34	66
2	33	67
3	33	67
4	34	66
5	33	67
6	34	66
7	34	66
8	34	66
9	35	65
10	35	65
11	37	63
12	37	63
13	36	64
14	37	63
15	37	63
16	37	63
17	36	64
18	37	63
19	38	62
20	37	63
21	37	63
22	36	64
23	37	63
24	37	63
25	38	62
26	38	62
27	39	61
28	40	60
29	40	60
30	41	59

	Rain chance (%)
1	54
2	54
3	54
4	54
5	54
6	54
7	54
8	54
9	53
10	53
11	52
12	52
13	51
14	50
15	49
16	48
17	47
18	46
19	44
20	43
21	42
22	40
23	38
24	37
25	35
26	34
27	33
28	32
29	31
30	30

	Dry (%)	Comfortable (%)	Humid (%)
1	28	58	14
2	28	57	15
3	28	57	15
4	28	57	15
5	28	57	15
6	28	57	15
7	29	56	15
8	29	55	16
9	29	55	16
10	30	54	16
11	30	54	16
12	30	54	16
13	31	53	16
14	32	52	16
15	32	53	15
16	33	52	15
17	33	52	15
18	34	52	14
19	35	51	14
20	36	51	13
21	37	50	13
22	39	49	12
23	41	48	12
24	42	47	11
25	44	45	10
26	46	44	10
27	48	43	9
28	49	42	9
29	51	41	8
30	53	40	7