If you looked through previous posts you would know not this month but in the near future.

Lunar New Year 2020: end of January

I know what you are asking, but I feel compelled to share this answer: THERE IS ALWAYS A SALE.

^{Note: All Times are PST/PDT}
Daily Deals. - Start every day at 10AM . The item put on sale usually is on sale for 48 hours.
Weeklong Deals. - Starts Monday at 10AM , usually goes through Friday at 10AM.
Midweek Madness. - Starts Tuesdays at 10AM ending Thursday at 10AM.
Weekend Deals. - Starts Thursday at 10AM , usually goes through Monday 10 AM.
Free Weekends. - Deal times are same as Weekend Deals, the game you can play for free usually stops being free Sunday afternoon even though the deal is usually good through Monday at 10AM.
Publisher week/weekends. - Dates/days vary and aren't known ahead of time.
Anniversary Sales. - Dates/days vary and aren't known ahead of time.
Event Sales (Quakecon, May the 4th/StarWars, Anime weekend, shoot-em up sale, Golden Week, others I can't remember that they do randomly throughout the year). - Dates/days vary and aren't known ahead of time.

Then there are the major sales, exact dates aren't known/100% certain until the information leaks 1-2 weeks before they start...if they leak at all. They will all start at 10AM on whatever day:
Lunar Sale (Late January)
Spring Cleaning Event (Starts like a month or so before the Summer Sale, not really a sale as more of just an event to play your backlog)
Summer Sale (Starts mid/late June)
Winter Sale (Starts mid/late December)
Halloween Sale (Around Halloween every year)
Autumn Sale (Around US Thanksgiving weekend)

AND THEN ON TOP OF ALL THAT: Publisher/developers can put their game(s) on sale whenever they damn well feel like. Released new DLC? Make the entire franchise on sale! It's the 12th of the month? 12% off all our games! etc and so forth. - These can vary on both date/time as a publisher can choose to end a sale at midnight if they felt like doing so.

So, summary: THERE IS ALWAYS A SALE!

Side notes:
There are also lots of other retailers like Humble, Fanatical, etc that have their own set of sales which include games you can activate on Steam!
Use sites like isthereanydeal.com to see price history and lowest prices across multiple stores on games you want!
Also don't forget to add games to your Steam Wishlist so you get notified when they are on sale!