I'm terrible with metrics and Celsius conversion, but I'm guessing that 16 degrees is around 60 degrees Farenheit? If so you can probably grow tomatoes. However, since I never grew in such a warm winter climate not sure if tomatoes would be affected by the winter sun light. How much sun do you get in winter? If the daylight is decreasing, the tomatoes may not like it, but then again maybe they will. I'm sure you can grow many 'winter hardy' plants and vegetables as well, such as spinach, lettuce, berries and many other things. You may want to also ask this question on the tropical forum or something similar, you'd probably get better answers there as well. Good luck!

I'm not looking forward to winter where we are, though it keeps a lot of the nasty bugs away.

Some of the plants grown in the summer in the USA and Europe are short-lived perennials in the tropics. Tomatoes, chili peppers, and some squash varieties.

Your gardening would be more controlled by heat tolerance and water supply. Another factor would be that you don't have big changes in day length, because you are so close to the equator. That might affect some plants that are accustomed to changes in day length.

https://en.wikipedia.org/wiki/Luanda#Climate 

Ask some experienced gardeners, or a local college's agriculture department.

I
think you should absolutely try to garden all year round, but I would say that temperatures
are only half of your battle the other half is moisture. Tomatoes and the rest
of the Solanaceae/nightshade family do not like high moisture...if you get lots
of humidity/rain...then fungal diseases may make it impossible for you to grow
all year round. You can look for varieties that are resistant to many diseases if you need to.

With that said, there are many places where tomatoes, peppers, and eggplants live
for 5 years or more while producing lots of produce.

Thanks guys, you have been helpful. I have started and will be updating what happens per season. Thanks again....