While southern Spain doesn't experience the glorious splash of autumn colours experienced elsewhere in the world, there are some attractive sights to see in the countryside. This article shows some views near Coín in the province of Málaga, Spain.
The writer was recently stuck in the middle of nowhere, looking after her son's house and dogs while he visited Barcelona for a few days.
With a very slow Internet connection, and not much else happening, photography and videography called.
She even got up at dawn, which is a rare experience (even when dawn is at 8:00 am!). The colors in the sky were quite beautiful to view:

Autumn colours in the Spanish countryside - sunrise
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Autumn colours in the Spanish countryside - sunrise.
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Fortunately, the immediate area around the house was not affected by the recent
devastating fires, and with some recent rain, everything is looking green and lush.
In October, the weather in southern Spain is still warm and mostly sunny, and farmers tend to get out in the fields, ploughing and preparing the soil for the next crop.
With local farms being relatively small, this farmer uses a small machine to do the work himself. Actually it took him pretty much the whole day to plough around 6 acres of land. Regrettably he did not even have a siesta (the writer would have liked one herself without the noise!).

Autumn colors in the Spanish countryside - farmer working in the fields.
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The olive trees are now ready for harvesting, as can be seen from these images taken in the warm, golden evening light.

Autumn colors in the Spanish countryside - mature olive tree.
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Autumn colors in the Spanish countryside
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Autumn colors in the Spanish countryside - playing with DOF on olives.
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That same gorgeous light made for some interesting images while strolling around the garden:

Autumn colors in the Spanish countryside
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Autumn colors in the Spanish countryside
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Autumn colors in the Spanish countryside
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All in all, autumn is a great time to visit the
south of Spain. The raging heat of summer has cooled, and temperatures are comfortable - warm in the sun, a little cool in the evenings. The heavy rains have not yet really set in and a
good time can be had by all.