There are three distinctive weather zones in Andalucia.
THE COASTAL ZONE - MÁLAGA, CÁDIZ, HUELVA, ALMERÍA
The Andalusian coast, Costa del Sol and Marbella experiences hot summers where it is possible to sunbathe almost every day from June until September with little or no rain. Daily highs reach 35° C and nights as low as 15° C but definitely always short sleeve weather. From hot summers to mild winters where one might experience a mixture of beautiful clear, sunny winter days as well as overcast but warm days. The evenings are noticeably cooler but the nightly low rarely reaches below 10° C while during the day highs remain around 20° C.
Hot Summers
Sunbathing almost every day from June to September. Virtually no rain. Daily highs about 35C and nightly lows 15C. Shirt sleeve weather all the time evenings included.
Mild Winters
Mixture of beautiful clear, sunny winter days with overcast but warm days. Evenings noticeably cooler. First rains are late September or early October, can be heavy rarely last more than a day or two. Daily highs about 20C and nightly lows rarely much below 10C. Pullover in the day, jacket in the evening.
INLAND LOWLAND ZONE - SEVILLE, CÓRDOBA, JAÉN
Very Hot Summers
Hot sun almost every day from June to September. Virtually no rain. July and August almost too hot. Daily highs up to 40C and nightly lows 18C. Shirt sleeve weather all the time evenings included.
Mild Winters
Mixture of beautiful clear, sunny winter days with overcast but warm days. Evenings noticeably cooler. First rains are late September or early October, can be heavy rarely last more than a day or two. Daily highs about 20C and nightly lows rarely below 10C. Pullover in the day, jacket in the evening.
INLAND HIGHLAND ZONE - GRANADA, JAÉN, SIERRA NEVADA
Warm Summers
Sunny almost every day from June to September. Virtually no rain. July and August still hot. Burning power of the sun is deceptive in highlands. Daily highs up to 30C and nightly lows 8C. Shirt sleeve weather in the days perhaps a pullover in the evenings.
Cool Winters
Mixture of beautiful clear, sunny winter days with overcast but cool days. Evenings noticeably much colder after the sun sets. First rains are late September or early October, can be heavy rarely last more than a day or two. Daily highs about 20C and nightly lows down to freezing. Pullover or jacket in the day, warm coat in the evening. Room heating required.