Ok so as you know planting season in UAE is reversed to what you may be used to. One of the most important things to consider when planting a vegetable garden here is when to plant. Plant too early or two late and your seedlings will probably never make it. Surfing the web I have come across a few resources and a few facts. Our climate is very similar to that of Arizona in US. So what we could do is follow their growing calendar and use available resources specific to this state. Note that even Arizona itself has a few major groups and planting dates for them. We could use the group one, which is elevation below 1000 feet.  If you have semi shaded location or location under shade cloth (my plan) you could use group 2 dates or use the next month as planting date. So after checking the guide for UAE here , guides for Arizona, here and here, all available at the downloads  page, and a chat with Yasmin, from UAE Agriculture group, I have come up with the following list of things we could probably still plant now.
I AM NOT STATING WE CAN, I AM SAYING WE PROBABLY CAN. I am going to try and see what happens. The results are not guaranteed so do it at your own risk.

All kinds of beans (except broad beans aka Fava beans): Green,  blackeye beans (cowpea), soy beans, yardlong beans, pigeon beans (toor dal), winged beans (if you can find them here do let me know), adzuki beans, chickpeas (, hummus, bengal gram, channa), mung beans, lablab (hiyacinth), vigna mungo (black gram, urad bean), cluster bean (gawar beans, if you can find them let me know) and etc.

Melons

Watermelons

Cucumber

Eggplants

Okra

Sweet potato

Taro

Yam

Radish

Summer Squashes

Winter Squashes (???)

Corn (???)

Garlic

Peanuts

Beets

Chillies

Peppers

Amaranth

Malabar Spinach (basella)

Molokhia (jute leaves).

Roselle

All kinds of gourds

Basil

I'm sure this list is incomplete and there are other crops still possible to plant now. If you know of any please comment and I'll add them to the list.

Happy Gardening