For increased range and damage, try casting Shock Blast through the Acceleration Gate.
If you find yourself taking lots of damage, try using Jayce's Hammer Stance, as it grants you additional defenses.
Be sure to switch stances often. It will enhance your attacks and grant you quick bursts of speed.
Janna's at her strongest when buffing another ally. If you can harass her ally, it will weaken her ability to fight you.
Save an interrupt ability for when Janna uses her ultimate.
Listen for the charge up sound on Howling Gale in case Janna is trying to hit you with it from off screen or from brush.
The stat comparisons shown on this page highlight some significant Jayce against Janna counter statistics that may help you realize the differences between the two. Jayce’s KDA ratio ([kills + assists] / deaths) of NaN is more than Janna’s ratio of NaN, highlighting that Jayce may be more central to his team's team fighting capacity than Janna. This observation is largely a result of the difference in kills.
Jayce typically has a much larger longest kill spree than his counter does. Commonly, he takes more damage than Janna. This typically indicates different amounts of tankyness, yet it can also imply that the one champ has less agility and thus is not able to kite away from additional harm when engaged or poked.
Both League of Legends champions are great. Both have their pros and cons. In the game's current meta, Jayce usually loses when taking on Janna, with a 46.1% win rate. As a result, Jayce makes a bad counter to Janna.
While Jayce does have a lower win rate compared to Janna, when on opposite teams, Jayce also has a greater learning curve that makes him a more time consuming champ to learn and master. You should be very concerned when picking Jayce into Jannaas his relative depth means that you may not be able to reach his full potential without a lot of practice beforehand.
Furthermore, Jayce also has only a small amount of utility and CC, a similar amount to Janna. This makes her just as valuable during team fights, especially when trying to counter champions with a lot of burst damage.
While there isn't one best champion in League of Legends, in Jayce vs Janna matchups, Janna is the better champion with a much lower win rate, similar champion depth, and a similar amount of utility to help out your teammates during team fights.
Jayce is a bad counter for Janna. You will do well by focussing your gameplay on keeping up your CS and clearing objectives. If you can do that, you should hold your own as Jayce against Janna.
To learn all of the intricacies of Jayce to counter Janna during both the early game and mid / late game phases of League of Legends, you should keep reading to learn a few extra tips and tricks for this matchup. If you listen to the build and tips displayed here, you will grow your win rate by a lot and be closer to League of Legends pro players.
Jayce often gets much more CS as Janna. Champs who on average don't take much CS often don't have to have much CS to be valuable teammates, such as support champions. They are capable of scaling properly off of their skills, stats, and first items alone. Yet, champions with a lot of CS, such as hyper-carries, often have to have several high cost items to be effective. In either case, try to exceed the values displayed here to do well.
The most important items to use in your Jayce versus Janna build include Muramana, Maw of Malmortius, and Serylda's Grudge. When Jayce incorporated at least these three pieces in his build, he performed much better countering Janna than with many other commonly used builds. In fact, Jayce boasted an average winrate of 46.1% battling Janna with these items in his kit.
To have the best likelihood of coming out on top against Janna as Jayce, you should equip the First Strike, Magical Footwear, Biscuit Delivery, Cosmic Insight, Manaflow Band, and Transcendence runes from the Inspiration and Sorcery rune sets. Out of all the rune combinations players picked for Jayce vs Janna counter picks, this combination of runes yielded the highest win rate. In fact, these runes provided a 46.1% win rate overall.
By default, tips, statistics, and builds on how to beat Janna as Jayce are shown for all skill levels combined. To filter the statistics and builds to a specific skill level, you should use the selection menu located above.