Weather in Mexico in July

July climate overview

Daytime highs across Mexico in July run from 29.8°C (Cancun) to 30.9°C (Puerto Vallarta). In Puerto Vallarta about 100% of July days reach 25°C. Nights average 25.8°C; the coldest 10% of nights in Cancun fall to 25°C or below.

Rainfall in July

Expect around 19 rainy days (1 mm or more) in July, with Tulum the driest (17 days) and Puerto Vallarta the wettest (28 days). The wettest July at Puerto Vallarta between 1991 and 2020 was 2008 with 466 mm; the driest was 2018 with 144 mm.

Sea temperature

The sea averages 28.8°C around Mexico in July - warmest at Puerto Vallarta (29.6°C). That is comfortable for swimming.

Sunshine and daylight

Around 5.4 hours of sunshine a day on average, out of 13.1 hours of daylight (sunshine estimated from cloud cover).

July against the rest of the year in Mexico

July is the 2nd warmest month of the twelve in Mexico. It is 0.5°C warmer than June and 0.1°C warmer in August. The hottest month here is August (30°C) and the coolest January (26°C).

Which part of Mexico in July?

• Most sunshine: Cancun, 6.5 h a day.
• Driest: Tulum, about 17 rainy days.
• Warmest sea: Puerto Vallarta, 30°C.
• Hottest: Puerto Vallarta, 31°C by day.
• Coolest (better for walking and cities): Cancun, 30°C.

What to pack for Mexico in July

Based on the averages: light, loose clothing and serious sun protection - midday highs sit around 30°C; a rain jacket - roughly 19 wet days; swimwear - the sea is 29°C.

Similar weather elsewhere in July

Within 1.5°C of Mexico's July daytime average: Orlando (31°C), Albufeira (31°C, sea 20°C), Montego Bay (31°C, sea 29°C), Ayia Napa (31°C, sea 27°C), Crete (31°C, sea 25°C). See the full ranking for July.

Which part of Mexico is best in July?

For a coastal holiday, Tulum and Riviera Maya offer the strongest balance of heat and fewer rainy days among these destinations. Both reach 30°C by day, with 17 rainy days, compared with 18 in Playa del Carmen and Cancun. That is a small difference, so it should not decide your trip on its own. Puerto Vallarta is hotter at 31°C, but its 28 rainy days make it a less suitable choice if dry weather is your priority. Its nights are cooler at 24°C, though still warm. Choose the Caribbean options for fewer rain interruptions, rather than expecting a dry July.

What the weather means for your holiday

Pack for warm evenings as well as hot days: light clothing makes more sense than relying on the temperature to fall after sunset. Mexico's average daytime temperature of 30°C is noticeably higher than London's July average of 22°C, so leave room for shade and breaks during the hottest part of the day. Average sunshine is 5.4 hours, which means July is not simply a write-off for outdoor time, despite the frequent rain. Keep plans flexible and carry lightweight rain protection. With the sea averaging 29°C, swimming should feel warm rather than brisk, but water temperature alone does not tell you whether conditions are safe.