Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 25.1 °C | 23.8 °C | 1 day | Ideal — one of the best times of year |
| February | 25 °C | 23.2 °C | 2 days | Ideal — one of the best times of year |
| March | 25.6 °C | 22.4 °C | 0 day | Ideal — one of the best times of year |
| April | 27.2 °C | 23.6 °C | 0 day | Ideal — one of the best times of year |
| May | 29.1 °C | 25.8 °C | 0 day | Ideal — one of the best times of year |
| June | 30.5 °C | 28 °C | 5 days | Ideal — one of the best times of year |
| July | 31.4 °C | 29.7 °C | 12 days | Ideal — one of the best times of year |
| August | 30.7 °C | 30.4 °C | 20 days | Unfavourable season |
| September | 30.5 °C | 30.5 °C | 18 days | Unfavourable season |
| October | 30.1 °C | 30 °C | 8 days | Ideal — one of the best times of year |
| November | 28.5 °C | 27.9 °C | 1 day | Ideal — one of the best times of year |
| December | 26.1 °C | 25.3 °C | 2 days | Ideal — one of the best times of year |
Nearby in September
Before you go
Three things to check once you have picked your dates.
Entry
No visa needed for stays of up to 180 days. Passport valid until your return date. Keep the entry stamp or printed e-gate ticket, you must show it to leave; the Embassy recommends 180 days’ validity; Quintana Roo entry tax.
For a British passport, per the UK Foreign Office on 11 September 2026. Rules change: check before booking.
Safety
Near an area advised against
Mazatlán is outside the areas concerned, but right next to them. Areas concerned: Tijuana and Tecate; the states of Chihuahua, Sinaloa, Tamaulipas, Zacatecas, Michoacán, Colima and Guerrero, except expressly exempted cities (Chihuahua, Los Mochis, Mazatlán, Morelia, Manzanillo, Ixtapa-Zihuatanejo, Tampico); south-west Guanajuato, southern Jalisco, the Guatemalan border strip.
Official advice updated 11 September 2026
Health
Vaccines · typhoid recommended for most travellers; hepatitis A and hepatitis B if you are not already vaccinated; chikungunya depending on activities and areas visited. Routine vaccines up to date (measles in particular).
Yellow fever · No yellow fever locally, vaccine not recommended. No entry requirement.
Malaria · Present. Areas: Campeche, Chiapas, and the southern part of Chihuahua state Rare in the states of Oaxaca, Sinaloa, Sonora, and Tabasco No malaria transmission along the U.S.–Mexico border. Preventive medication recommended: Campeche, Chiapas, and the southern part of Chihuahua state: Atovaquone-proguanil, chloroquine, doxycycline, mefloquine, primaquine , tafenoquine All other areas with malaria transmission: No chemoprophylaxis recommended (insect bite precautions and mosquito avoidance only) — prescribed before departure.
Mosquitoes · dengue and Zika reported: protect yourself from bites.
Per the CDC (page reviewed 3 September 2026); see a travel clinic a few weeks before departure.
Beau Fixe is not a safety or health authority. These notes summarise dated public texts and link to their source: France Diplomatie (Licence Ouverte 2.0), Foreign, Commonwealth & Development Office (gov.uk, Open Government Licence v3.0), Centers for Disease Control and Prevention (Source: CDC). Only the competent authorities are authoritative.
FAQ
Can you swim in Mazatlán in September?
The sea averages 30.5°C in September — yes, pleasant swimming.
How hot is Mazatlán in September?
Expect 30.5°C in the afternoon and 25.2°C at night, averaged over the last 10 years.
Does it rain a lot in Mazatlán in September?
Around 18 days with rain (≥ 1 mm) in the month — 61% of days.