The Colima Volcano, also known as Fire Volcano, has shot ash and smoke more than 2,000 metres into the sky.
Located in the southwest, the volcano has been exhibiting fresh activity since the start of July.
It has only erupted around 40 times since the 16th Century.
Local authorities have an emergency plan that includes continuous observation of the volcano and mandatory evacuations, if needed.
Meanwhile around 530 km away, the Popocatepetl Volcano, nicknamed El Popo, has recorded 12 exhalations, mostly of gas and vapour.
After almost 50 years of dormancy, it came back to life in 1994 and since then has been producing strong explosions at irregular intervals.
The closest volcano to Puerto Vallarta is the Colima Volcano that sits on the border of Colima and Jalisco, 300 km from Puerto Vallarta.