Map from Google - Costa_Tropical

In the Costa Tropical (also known as Costa de Granada or Costa Granadina), the part of the southern Spanish coast in the province of Granada, the climate is Mediterranean, with mild and relatively rainy winters, and hot and sunny summers. The average temperature of January is about 12 °C (53.5 °F), that of August about 26 °C (79 °F).
There are towns like La Herradura, Almuñécar, Salobreña, Motril, Torrenueva, Calahonda, Castell de Ferro, La Mamola, La Rábita.
Behind the coast there are elevations overlooking the sea: these are the first hills of Sierra Nevada, which is at no great distance (the highest peaks over 3,000 meters are located at about 35 kilometres or 20 miles from the coast).

Costa Tropical, Sierra Nevada in the background

Here are the average temperatures of Motril.
Average temperatures - Motril
Min (°C)781012141820211915118
Max (°C)161719212428313128241916
Min (°F)454650545764687066595246
Max (°F)616366707582888882756661

The rains in the Costa Tropical are not abundant, since they slightly exceed 300 millimetres (12 inches) per year, and follow a Mediterranean pattern, in fact most of them fall from October to April, while in summer it hardly ever rains.
Here is the average rainfall of Motril.
Average precipitation - Motril
Prec. (mm)453530352072212354545315
Prec. (in)

The wind blows frequently: in the cold half of the year it comes along with the Atlantic depressions, while in summer it blows as afternoon breeze.

Winter, from December to February, is mild, and is characterized by sunny periods, alternating with periods of bad weather, with wind and rain. Very cold days are rare: only in the coldest nights the temperature can go down to the freezing point, but even in these cases, usually during the day the temperature rises above 10 °C (50 °F). In practice, it never snows or freezes.

Spring, from March to May, is mild and sunny, with rainy days still possible, but not very frequent. Starting in May, and sometimes in April, we begin to see the first hot days, with highs around 30 °C (86 °F).

Summer, from June to mid-September, is hot and sunny. Typically temperatures hover around 28 °C (82 °F) in June and September, and about 30/32 °C (86/90 °F) in July and August, the weather is hot and muggy, but the sea breeze blows, in short, the typical Mediterranean summer. However, when the wind blows from the interior of Andalusia, the heat can be intense, and the temperature can reach 35/37 °C (95/99 °F), and sometimes even 40 °C (104 °F).

Autumn, from mid-September to November, is initially warm, and then becomes gradually milder, while Atlantic fronts become gradually more frequent. In October there are still many warm and sunny days, especially in the first half. In November we are now well into autumn, with a mild weather, but often cloudy and quite rainy.

The amount of sunshine in the Costa Tropical is very good in summer, when clear skies prevail, it is good in spring, when cloudy periods are still possible, while it is decent in autumn and winter, when in addition to sunny periods, cloudy and rainy days occur quite frequently.

Almuñécar, coast

For swimming, the sea is never very warm, given the infiltration of water from the Atlantic, in fact it is still very cool in June, when its temperature is about 20 °C (68 °F), then rises to 22 °C (72 °F) in July and September, and to 23 °C (73 °F) in August, when it becomes acceptable for swimming.
Here are the average sea temperatures.
Sea temperature - Costa Tropical
Costa TropicalJanFebMarAprMayJunJulAugSepOctNovDec
Sea (°C)161515161720222322201816
Sea (°F)615959616368727372686461

When to go

The best time to visit the towns of the Costa Tropical, for walking and hiking, corresponds to the periods from mid-April to mid-May, and from mid-September to mid-October, especially if you have in mind a trip to Granada, which in summer is often hot.
For a beach holiday, the best time is instead the summer, from June to mid-September.
In summer you can go hiking in Sierra Nevada, where of course you will find a climate becoming cooler with increasing altitude.
In winter you can combine a ski holiday in Sierra Nevada to some moments of relax on the coast, where you will find many mild and sunny days.

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