Been there in Mar / Apr / July / Oct & Nov ( not all in the same year tho' lol ) Just back a few weeks and heading back again in October. Nights are shorter in November and cooler so a jumper would be advisable if heading home late. A bit more cloud likely in November too, you're really looking at the equivalent of a good summers day here. ( as in a good day last summer not this summer ) . The wind is not as noticeable later in the year. In fact, October / November / January & February are the main months when it dies down. But as the Lanzarotenos say " When the wind stops blowing is when the island stops being Lanzarote". It's been a quiet enough summer but the weather has been good and water temp is lovely. If this is your first time I'd recommend looking at or for lots of info on the island. Make sure and tour the island, there are some amazing sights and its so small a couple days car hire would let you see a great deal. Enjoy it.