July is the hottest month in Jaen with an average temperature of 26°C (79°F) and the coldest is January at 7°C (45°F). Being well inland Jaen has low humidity so - clear skies. In July the temperature can reach a 38°C that feels more like 40.
The nearest airport to Jaen is 105 kms away at Granada. Arriving by train is not much better, Jaen is at the end of a branch line from Cordoba that has four departures/arrivals per day.