The San Juan River flows around the city in the northeast. The surrounding area is steppe-way and consists mainly of Monte-bush, but also from rocky deserts. The climate is subtropical, with dry and very high daytime temperatures in summer and in winter the föhnartige Zonda wind, temperatures can often rise briefly to summer values.
San Juan Mto unapita karibu na mji katika kaskazini. eneo hilo ni mbuga ya njia na lina hasa ya Monte-msituni, lakini pia kutoka jangwa miamba. ya hali ya hewa ni joto kiasi, na joto na kavu juu sana katika majira ya mchana na wakati wa baridi föhnartige Zonda upepo, joto mara nyingi unaweza kupanda kwa ufupi kwa maadili ya majira ya joto.