Want to know if it'll rain tomorrow? You no longer have to leave Facebook to find out.

Axar.az reports that, Facebook started offering weather "greetings" to some users in April last year, but now it's rolling out a fully fledged weather app on both desktop and mobile.

The app is still not available to everyone. For example, I can access it on Android — it's located in the hamburger More menu (upper right corner) in the app, and listed under "Apps." On desktop, however, it's nowhere to be found. Some iOS users have also discovered it hidden in their Facebook app's hamburger menu.

If you do see it, you'll get a rudimentary app that gives you an hour-by-hour weather forecast for the current day and a simple forecast for the next five days. You can add custom locations in the settings (the app won't work without letting Facebook to access your location), switch from Celsius to Fahrenheit, and that's pretty much it in terms of options.

The app is powered by IBM-owned Weather.com, and you can get a more detailed weather forecast there by clicking on the "See More Weather Info" link at the bottom of the app.

As is, Facebook's weather app is limited in what it can do, and quite hidden from view, so we wouldn't expect it to replace your regular weather app of choice just yet. The question is: What are Facebook's plans for this thing? If the company takes it a couple steps further, it could become a real threat to similar standalone apps.

According to a company spokesperson, who spoke to TechCrunch, the goal behind the feature is "to develop products that connect people to the things they care about most." It's true, we do care about our weather.

We've contacted Facebook to learn more about the feature and will update this post with their comments.