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 stats shown on this page show several important Samira versus Janna counter statistics that may help us realize the differences between this pair of champions. Samira’s KDA ratio ([kills + assists] / deaths) of NaN is greater than Janna’s KDA ratio of NaN, demonstrating that Samira may be more central to her team's team fighting effectiveness than Janna. This observation is largely caused by the difference in kills.
Samira often has a much larger longest killing spree than her matchup does. Typically, she takes more damage than Janna. This commonly reflects different amounts of tankyness, yet it can also indicate that the one champion has less mobility and thus is unable to kite away from additional harm when engaged or poked.
Both League champs are great champions. Both champs have their pros and cons. In League's current meta, Samira usually loses when taking on Janna, with a 46.2% win rate. Therefore, Samira makes a bad counter for Janna.
While Samira does have a lower win rate compared to Janna, when on opposite teams, Samira also has a lower difficulty level that makes her a less difficult champ to learn and master. You should expect to face a difficult match when picking Samira into Janna.
Furthermore, Samira also has only a small amount of CC and other utility, a similar amount to Janna. This makes her just as valuable during teamfights, especially when facing champions with a ton of burst damage.
While there isn't one best champion for every situation in League of Legends, in Samira vs Janna matchups, Janna is the better champ with a much lower win rate, less champion complexity, and a similar amount of utility to help out your allies during late stage team fights.
Samira is a trash counter for Janna. Focus your actions on keeping up your gold and cs and destroying objectives. If you are able to do that, you should be able to stand on your own as Samira against Janna.
To learn all of the intricacies of Samira in order to counter Janna during both the early game and mid / late game phases of League of Legends, you should continue reading to gather a few extra lessons on this matchup. If you mind the build and suggestions shown above, you will grow your win rate by a lot and be that much closer to League of Legends pro players.
Samira often accumulates much more CS relative to Janna. Champs who typically don't take many minion kills typically don't have to have much CS to be effective, such as support champions. These kinds of champions are able to scale properly off of their abilities and first items alone. Yet, champs with large amounts of CS, such as hyper-carries, usually have to have many items to be effective. In either situation, try to do better than the numbers displayed on this page to do well.
The most crucial items to have in your Samira versus Janna build include Lord Dominik's Regards, Bloodthirster, and Immortal Shieldbow. When Samira bought at least these three items in her build, she performed significantly better against Janna than with many other typical counter builds. In fact, Samira had an average winrate of 46.2% when countering Janna with this build.
To have the greatest likelihood of vanquishing Janna as Samira, you should use the Conqueror, Triumph, Legend: Bloodline, Last Stand, Taste of Blood, and Treasure Hunter runes from the Precision and Domination rune sets. Out of all the rune combinations players chose for Samira vs Janna battles, this combo of runes yielded the best win rate. In fact, these runes provided a 46.2% winrate overall.
If you want to see Samira versus Janna tips and counter stats for a a particular rank, feel free to choose one from the selection menu above. By default, the stats and guides given are calculated using every round run with these champs.