March and April are the best months for hiking: ideal temperatures coupled with a dazzle of subtropical flowers on the hillsides. Late autumn also offers good hiking weather.
The summer months, especially August, can reach a sizzling 30°C and see the most daytrippers from Tenerife's Los Cristianos; June and September are a tad cooler and are good fiesta months, with San Juan and the week-long Fiestas Colombinas.
In winter expect some rainfall in December, January and, to a lesser extent, February, with an average temperature of around 17°C. Look for wild mushrooms on local menus in February.