Weather in Be The Final Boss changes on a set cycle, and each shift does more than swap the sky. The active weather applies a temporary buff to your run, from faster coin gains to a higher chance of rolling mutated units. Reading the current weather correctly tells you exactly when to farm, when to fight, and when to summon.
Quick answer: As of Update 1 there are three weather events, each lasting 5 minutes. Gold Rush multiplies coins from kills by 1.75x, Shard Storm multiplies shard drop chance by 1.3x with one extra drop attempt, and Cursed Moon doubles your total summon mutation chance. A new event begins 10 minutes after the previous one ends.
All weather events, effects, and durations
Every weather event runs for the same 5 minutes, so the difference comes down to which buff is active and how you should spend that window. The table below breaks down each one.
| Weather Event | Duration | Effect | Best use |
|---|---|---|---|
| Gold Rush | 5 minutes | Coins earned from enemy kills are multiplied by 1.75x. Gold coins rain from the sky. | Farming coins. Stack kills alongside your units to pull in as many coins as possible. |
| Shard Storm | 5 minutes | Shard drop chance is multiplied by 1.3x, with 1 additional drop attempt. The weather box turns blue and shards scatter across the map. | Farming shards. Focus on fights to collect shards of every rarity. |
| Cursed Moon | 5 minutes | Total summon mutation chance is multiplied by 2x. The weather box turns purple and shooting stars appear. | Summoning mutated units. Let your units fight while you roll for mutations. |
When the next weather event spawns
Weather events do not run back to back. After an event ends, there is a 10-minute gap before the next one starts. That means each cycle covers 5 minutes of active weather followed by 10 minutes without a buff.
You can track both the current weather and the timer for the next one in the bottom-right corner of the screen. Use that timer to line up your actions, such as saving coins for a summon push during Cursed Moon or holding your farming energy for the moment Gold Rush kicks in.
How to get the most from each event
Because every buff only lasts 5 minutes, the payoff depends on what you prioritize while it is live. Match your play to the weather rather than splitting your attention.
- Gold Rush: Commit to fights and rack up kills with your units so the 1.75x coin multiplier applies to as many enemies as possible.
- Shard Storm: Keep killing to trigger drops. The 1.3x chance plus the extra roll attempt means more shards across all rarities.
- Cursed Moon: Leave combat to your units and spend the window summoning, since the mutation chance is doubled.
Note: The three events above reflect Update 1. As the developers add more weather types, the roster and effects can expand, so recheck after major updates.
