Mazatlan weather in September

In September, Mazatlan sees average daytime highs of 30°C and overnight lows near 27°C, with 205 mm of rain across 19 wet days and about 12.1 hours of daylight. It is the 3rd-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 30°C through the month. The sky is clear or mostly clear about 24% of the time in September, and the air most often feels miserable.

Daylight stretches from about 12 h 30 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Mazatlan's 10th-clearest and 11th-windiest month. For the whole year in context, see Mazatlan's year-round climate.

Daytime high: 30°; 3rd warmest
Overnight low: 27°; 10th coldest
Rainfall: 205 mm; 19 wet days
Daylight: 12 h 06 min; 5:56 AM – 6:04 PM
Cloud cover: 66%; 10th clearest
Wind: 9 km/h; 11th windiest
Solar energy: 4.94 kWh/m²
Travel score: 4.0; out of 10

Mazatlan is municipal seat of Mazatlán, State of Sinaloa, Mexico.

Founded: 1531

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

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

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Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 30°C through the month.

A typical September day in Mazatlan reaches about 30°C in the afternoon and slips back to 27°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 31°C. Set against its neighbours, September runs on par with 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)	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30
Avg low (°C)	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27

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

How September really feels in Mazatlan

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.

Mazatlan weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 1st-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	23° / 19°	15	1.5	10.7	8.6
Feb	23° / 19°	15	1.2	11.2	8.7
Mar	23° / 20°	3	0.4	11.8	9.0
Apr	25° / 21°	1	0.2	12.5	9.0
May	27° / 23°	1	0.2	13.1	8.8
Jun	29° / 26°	25	3.1	13.4	7.2
Jul	30° / 27°	132	14.3	13.3	4.5
Aug	30° / 27°	184	18.8	12.8	3.9
Sep	30° / 27°	205	19	12.1	4.0
Oct	29° / 26°	65	6.7	11.5	6.3
Nov	27° / 23°	35	2	10.9	8.3
Dec	24° / 20°	9	1.4	10.6	8.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 59%. 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 (%)	27	27	28	28	30	30	31	33	33	34	36	37	38	39	40	41	42	42	44	45	45	47	49	51	52	54	56	57	59	61
Cloudier (%)	73	73	72	72	70	70	69	67	67	66	64	63	62	61	60	59	58	58	56	55	55	53	51	49	48	46	44	43	41	39

	Clearer (%)	Cloudier (%)
1	27	73
2	27	73
3	28	72
4	28	72
5	30	70
6	30	70
7	31	69
8	33	67
9	33	67
10	34	66
11	36	64
12	37	63
13	38	62
14	39	61
15	40	60
16	41	59
17	42	58
18	42	58
19	44	56
20	45	55
21	45	55
22	47	53
23	49	51
24	51	49
25	52	48
26	54	46
27	56	44
28	57	43
29	59	41
30	61	39

Chance of precipitation in September

Any precipitation

Mazatlan gets around 205 mm of rain over 19 wet days in September, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 62% and peaks near 71% 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 (%)	71	71	71	71	71	71	71	71	70	69	69	68	67	66	65	64	63	62	61	60	58	57	56	54	52	51	49	47	45	44

	Rain chance (%)
1	71
2	71
3	71
4	71
5	71
6	71
7	71
8	71
9	70
10	69
11	69
12	68
13	67
14	66
15	65
16	64
17	63
18	62
19	61
20	60
21	58
22	57
23	56
24	54
25	52
26	51
27	49
28	47
29	45
30	44

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 94% 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
Oppressive (%)	3	4	4	4	5	5	5	5	6	6	6	6	6	7	7	7	7	7	7	7	7	7	7	7	7	7	7	8	8	8
Miserable (%)	97	96	96	96	95	95	95	95	94	94	94	94	94	93	93	93	93	93	93	93	93	93	93	93	93	93	93	92	92	92

	Oppressive (%)	Miserable (%)
1	3	97
2	4	96
3	4	96
4	4	96
5	5	95
6	5	95
7	5	95
8	5	95
9	6	94
10	6	94
11	6	94
12	6	94
13	6	94
14	7	93
15	7	93
16	7	93
17	7	93
18	7	93
19	7	93
20	7	93
21	7	93
22	7	93
23	7	93
24	7	93
25	7	93
26	7	93
27	7	93
28	8	92
29	8	92
30	8	92

Wind in September

Winds average 9 km/h in September.

Across September, daily wind ranges from about 9 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)	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	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	9	calm
2	9	calm
3	9	calm
4	9	calm
5	9	calm
6	9	calm
7	9	calm
8	9	calm
9	9	calm
10	9	calm
11	9	calm
12	9	calm
13	9	calm
14	9	calm
15	9	calm
16	9	calm
17	9	calm
18	9	calm
19	9	calm
20	9	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 30 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 42 minutes over September. Sunrise moves from 5:51 AM to 6:01 AM, and sunset from 6:20 PM to 5:49 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)	12.5	12.5	12.4	12.4	12.4	12.4	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	12.0	12.0	12.0	12.0	11.9	11.9	11.9	11.9	11.9	11.8	11.8
Sunrise (AM)	5:51	5:52	5:52	5:52	5:53	5:53	5:53	5:53	5:54	5:54	5:54	5:55	5:55	5:55	5:56	5:56	5:56	5:57	5:57	5:57	5:58	5:58	5:58	5:59	5:59	5:59	6:00	6:00	6:00	6:01
Sunset (PM)	6:20	6:19	6:18	6:17	6:16	6:14	6:13	6:12	6:11	6:10	6:09	6:08	6:07	6:06	6:05	6:04	6:03	6:02	6:01	6:00	5:59	5:58	5:57	5:55	5:54	5:53	5:52	5:51	5:50	5:49

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.5	5:51	6:20
2	12.5	5:52	6:19
3	12.4	5:52	6:18
4	12.4	5:52	6:17
5	12.4	5:53	6:16
6	12.4	5:53	6:14
7	12.3	5:53	6:13
8	12.3	5:53	6:12
9	12.3	5:54	6:11
10	12.3	5:54	6:10
11	12.2	5:54	6:09
12	12.2	5:55	6:08
13	12.2	5:55	6:07
14	12.2	5:55	6:06
15	12.2	5:56	6:05
16	12.1	5:56	6:04
17	12.1	5:56	6:03
18	12.1	5:57	6:02
19	12.1	5:57	6:01
20	12.0	5:57	6:00
21	12.0	5:58	5:59
22	12.0	5:58	5:58
23	12.0	5:58	5:57
24	11.9	5:59	5:55
25	11.9	5:59	5:54
26	11.9	5:59	5:53
27	11.9	6:00	5:52
28	11.9	6:00	5:51
29	11.8	6:00	5:50
30	11.8	6:01	5:49

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.94 kWh/m².

For context, solar energy here swings from a low near 4.28 kWh/m² to a high of 7.73 kWh/m² in May across the year — September's 4.94 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)	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	4.9	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.0	5.1
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	5.0	Bright
2	5.0	Bright
3	5.0	Bright
4	5.0	Bright
5	5.0	Bright
6	5.0	Bright
7	5.0	Bright
8	5.0	Bright
9	5.0	Bright
10	5.0	Bright
11	5.0	Bright
12	5.0	Bright
13	5.0	Bright
14	5.0	Bright
15	5.0	Bright
16	5.0	Bright
17	4.9	Bright
18	5.0	Bright
19	5.0	Bright
20	5.0	Bright
21	5.0	Bright
22	5.0	Bright
23	5.0	Bright
24	5.0	Bright
25	5.0	Bright
26	5.0	Bright
27	5.0	Bright
28	5.0	Bright
29	5.0	Bright
30	5.1	Bright

Planning a trip in September

Hazard calendar for Mazatlan

In seasonPeak

In September, Mazatlan sits inside its pacific hurricane and monsoon season. The full year is below, with each hazard's peak months called out.

Mazatlan sits in the eastern Pacific hurricane zone; the season peaks August–September.

Mazatlan's monsoon runs July–September, when most of the year's rain falls.

Pacific hurricane

Monsoon

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is September a good time to visit Mazatlan?

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

4.0

Sightseeing

11th-best month of the year

5.5

Beach & pool

11th-best month of the year

September is a reasonable time to visit Mazatlan for sightseeing.

What to pack for Mazatlan in September

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

In September, Mazatlan sees daytime highs around 30°C and nights near 27°C. Pack light clothes and rain gear. Worth having: sun protection. About 19 days see rain.

light clothesrain gearsun protection

Sea temperature near Mazatlan 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 August at about 30°C and coldest in March near 22°C.

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	23	23	22	23	26	28	29	30	30	30	27	25
Comfort	Refreshing	Refreshing	Refreshing	Refreshing	Warm	Warm	Tropical	Tropical	Tropical	Tropical	Warm	Warm

	Sea temperature (°C)	Comfort
Jan	23	Refreshing
Feb	23	Refreshing
Mar	22	Refreshing
Apr	23	Refreshing
May	26	Warm
Jun	28	Warm
Jul	29	Tropical
Aug	30	Tropical
Sep	30	Tropical
Oct	30	Tropical
Nov	27	Warm
Dec	25	Warm

UV index in Mazatlan 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 Mazatlan peaks around May 16 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 6 (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)	6	8	10	12	12	12	12	11	11	8	6	6
Level	High	Very high	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	High	High

	UV index (midday)	Level
Jan	6	High
Feb	8	Very high
Mar	10	Extreme
Apr	12	Extreme
May	12	Extreme
Jun	12	Extreme
Jul	12	Extreme
Aug	11	Extreme
Sep	11	Extreme
Oct	8	Very high
Nov	6	High
Dec	6	High

Location & terrain

Where is Mazatlan?

Mazatlan sits at 23.2°N, 106.4°W, 1 m above sea level, in Mexico. The nearest listed city is El Rosario, 63 km away.

Topography around Mazatlan

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

Within 3 km, the terrain around Mazatlan has only modest variations in elevation — a maximum elevation change of 80 m around an average of 5 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 302 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,594 m.

The land around Mazatlan is covered by artificial surfaces (55%) and water (36%) within 3 km, water (52%) and trees (23%) within 16 km, and trees (51%) and water (36%) within 80 km.

3 km

80 m

artificial surfaces 55%

16 km

302 m

water 52%

80 km

2,594 m

trees 51%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwatermangroves

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

September weather nearby: El Rosario 63 km · Escuinapa de Hidalgo 78 km · La Cruz 92 km · Pueblo Nuevo 109 km · El Salto 124 km · Acaponeta 136 km · Costa Rica 181 km · Tuxpan 183 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 Mazatlan (23.2216°, -106.4189°, elevation 1 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. 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	30	27
2	30	27
3	30	27
4	30	27
5	30	27
6	30	27
7	30	27
8	30	27
9	30	27
10	30	27
11	30	27
12	30	27
13	30	27
14	30	27
15	30	27
16	30	27
17	30	27
18	30	27
19	30	27
20	30	27
21	30	27
22	30	27
23	30	27
24	30	27
25	30	27
26	30	27
27	30	27
28	30	27
29	30	27
30	30	27

	Clearer (%)	Cloudier (%)
1	27	73
2	27	73
3	28	72
4	28	72
5	30	70
6	30	70
7	31	69
8	33	67
9	33	67
10	34	66
11	36	64
12	37	63
13	38	62
14	39	61
15	40	60
16	41	59
17	42	58
18	42	58
19	44	56
20	45	55
21	45	55
22	47	53
23	49	51
24	51	49
25	52	48
26	54	46
27	56	44
28	57	43
29	59	41
30	61	39

	Rain chance (%)
1	71
2	71
3	71
4	71
5	71
6	71
7	71
8	71
9	70
10	69
11	69
12	68
13	67
14	66
15	65
16	64
17	63
18	62
19	61
20	60
21	58
22	57
23	56
24	54
25	52
26	51
27	49
28	47
29	45
30	44

	Oppressive (%)	Miserable (%)
1	3	97
2	4	96
3	4	96
4	4	96
5	5	95
6	5	95
7	5	95
8	5	95
9	6	94
10	6	94
11	6	94
12	6	94
13	6	94
14	7	93
15	7	93
16	7	93
17	7	93
18	7	93
19	7	93
20	7	93
21	7	93
22	7	93
23	7	93
24	7	93
25	7	93
26	7	93
27	7	93
28	8	92
29	8	92
30	8	92

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

	Clearer (%)	Cloudier (%)
1	27	73
2	27	73
3	28	72
4	28	72
5	30	70
6	30	70
7	31	69
8	33	67
9	33	67
10	34	66
11	36	64
12	37	63
13	38	62
14	39	61
15	40	60
16	41	59
17	42	58
18	42	58
19	44	56
20	45	55
21	45	55
22	47	53
23	49	51
24	51	49
25	52	48
26	54	46
27	56	44
28	57	43
29	59	41
30	61	39

	Rain chance (%)
1	71
2	71
3	71
4	71
5	71
6	71
7	71
8	71
9	70
10	69
11	69
12	68
13	67
14	66
15	65
16	64
17	63
18	62
19	61
20	60
21	58
22	57
23	56
24	54
25	52
26	51
27	49
28	47
29	45
30	44

	Oppressive (%)	Miserable (%)
1	3	97
2	4	96
3	4	96
4	4	96
5	5	95
6	5	95
7	5	95
8	5	95
9	6	94
10	6	94
11	6	94
12	6	94
13	6	94
14	7	93
15	7	93
16	7	93
17	7	93
18	7	93
19	7	93
20	7	93
21	7	93
22	7	93
23	7	93
24	7	93
25	7	93
26	7	93
27	7	93
28	8	92
29	8	92
30	8	92

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

	Clearer (%)	Cloudier (%)
1	27	73
2	27	73
3	28	72
4	28	72
5	30	70
6	30	70
7	31	69
8	33	67
9	33	67
10	34	66
11	36	64
12	37	63
13	38	62
14	39	61
15	40	60
16	41	59
17	42	58
18	42	58
19	44	56
20	45	55
21	45	55
22	47	53
23	49	51
24	51	49
25	52	48
26	54	46
27	56	44
28	57	43
29	59	41
30	61	39

	Rain chance (%)
1	71
2	71
3	71
4	71
5	71
6	71
7	71
8	71
9	70
10	69
11	69
12	68
13	67
14	66
15	65
16	64
17	63
18	62
19	61
20	60
21	58
22	57
23	56
24	54
25	52
26	51
27	49
28	47
29	45
30	44

	Oppressive (%)	Miserable (%)
1	3	97
2	4	96
3	4	96
4	4	96
5	5	95
6	5	95
7	5	95
8	5	95
9	6	94
10	6	94
11	6	94
12	6	94
13	6	94
14	7	93
15	7	93
16	7	93
17	7	93
18	7	93
19	7	93
20	7	93
21	7	93
22	7	93
23	7	93
24	7	93
25	7	93
26	7	93
27	7	93
28	8	92
29	8	92
30	8	92