diff --git a/src/data/move.ts b/src/data/move.ts
index b85a3cea29f..6e4e3f60fcb 100644
--- a/src/data/move.ts
+++ b/src/data/move.ts
@@ -888,6 +888,33 @@ export class SacrificialFullRestoreAttr extends SacrificialAttr {
   }
 }
 
+/**
+ * Attribute used for moves which ignore type-based debuffs from weather, namely Hydro Steam.
+ * Called during damage calculation after getting said debuff from getAttackTypeMultiplier in the Pokemon class.
+ */
+export class IgnoreWeatherTypeDebuffAttr extends MoveAttr {
+  public weather: WeatherType;
+  constructor(weather: WeatherType){
+    super();
+    this.weather = weather;
+  }
+  /**
+   * Changes the type-based weather modifier if this move's power would be reduced by it
+   * @param user Pokemon that used the move
+   * @param target N/A
+   * @param move Move with this attribute
+   * @param args Utils.NumberHolder for arenaAttackTypeMultiplier
+   * @returns true if the function succeeds
+   */
+  apply(user: Pokemon, target: Pokemon, move: Move, args: any[]): boolean {
+    const weatherModifier=args[0] as Utils.NumberHolder;
+    //If the type-based attack power modifier due to weather (e.g. Water moves in Sun) is below 1, set it to 1
+    if (user.scene.arena.weather?.weatherType === this.weather)
+      weatherModifier.value = Math.max(weatherModifier.value, 1);
+    return true;
+  }
+}
+
 export abstract class WeatherHealAttr extends HealAttr {
   constructor() {
     super(0.5);
@@ -6666,7 +6693,8 @@ export function initMoves() {
       .attr(MovePowerMultiplierAttr, (user, target, move) => user.scene.arena.getTerrainType() === TerrainType.ELECTRIC && user.isGrounded() ? 1.5 : 1)  
       .slicingMove(),
     new AttackMove(Moves.HYDRO_STEAM, Type.WATER, MoveCategory.SPECIAL, 80, 100, 15, -1, 0, 9)
-      .partial(),
+      .attr(IgnoreWeatherTypeDebuffAttr, WeatherType.SUNNY)
+      .attr(MovePowerMultiplierAttr, (user, target, move) => [WeatherType.SUNNY, WeatherType.HARSH_SUN].includes(user.scene.arena.weather?.weatherType) && !user.scene.arena.weather?.isEffectSuppressed(user.scene) ? 1.5 : 1),
     new AttackMove(Moves.RUINATION, Type.DARK, MoveCategory.SPECIAL, -1, 90, 10, -1, 0, 9)
       .attr(TargetHalfHpDamageAttr),
     new AttackMove(Moves.COLLISION_COURSE, Type.FIGHTING, MoveCategory.PHYSICAL, 100, 100, 5, -1, 0, 9)
diff --git a/src/field/pokemon.ts b/src/field/pokemon.ts
index 52378a284b4..8afff1b2724 100644
--- a/src/field/pokemon.ts
+++ b/src/field/pokemon.ts
@@ -4,7 +4,7 @@ import { Variant, VariantSet, variantColorCache } from '#app/data/variant';
 import { variantData } from '#app/data/variant';
 import BattleInfo, { PlayerBattleInfo, EnemyBattleInfo } from '../ui/battle-info';
 import { Moves } from "../data/enums/moves";
-import Move, { HighCritAttr, HitsTagAttr, applyMoveAttrs, FixedDamageAttr, VariableAtkAttr, VariablePowerAttr, allMoves, MoveCategory, TypelessAttr, CritOnlyAttr, getMoveTargets, OneHitKOAttr, MultiHitAttr, StatusMoveTypeImmunityAttr, MoveTarget, VariableDefAttr, AttackMove, ModifiedDamageAttr, VariableMoveTypeMultiplierAttr, IgnoreOpponentStatChangesAttr, SacrificialAttr, VariableMoveTypeAttr, VariableMoveCategoryAttr, CounterDamageAttr } from "../data/move";
+import Move, { HighCritAttr, HitsTagAttr, applyMoveAttrs, FixedDamageAttr, VariableAtkAttr, VariablePowerAttr, allMoves, MoveCategory, TypelessAttr, CritOnlyAttr, getMoveTargets, OneHitKOAttr, MultiHitAttr, StatusMoveTypeImmunityAttr, MoveTarget, VariableDefAttr, AttackMove, ModifiedDamageAttr, VariableMoveTypeMultiplierAttr, IgnoreOpponentStatChangesAttr, SacrificialAttr, VariableMoveTypeAttr, VariableMoveCategoryAttr, CounterDamageAttr, IgnoreWeatherTypeDebuffAttr } from "../data/move";
 import { default as PokemonSpecies, PokemonSpeciesForm, SpeciesFormKey, getFusedSpeciesName, getPokemonSpecies, getPokemonSpeciesForm, getStarterValueFriendshipCap, speciesStarters, starterPassiveAbilities } from '../data/pokemon-species';
 import * as Utils from '../utils';
 import { Type, TypeDamageMultiplier, getTypeDamageMultiplier, getTypeRgb } from '../data/type';
@@ -1338,7 +1338,8 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
               source.removeTag(typeBoost.tagType);
             }
           }
-          const arenaAttackTypeMultiplier = this.scene.arena.getAttackTypeMultiplier(type, source.isGrounded());
+          const arenaAttackTypeMultiplier = new Utils.NumberHolder(this.scene.arena.getAttackTypeMultiplier(type, source.isGrounded()));
+          applyMoveAttrs(IgnoreWeatherTypeDebuffAttr, source, this, move, arenaAttackTypeMultiplier);
           if (this.scene.arena.getTerrainType() === TerrainType.GRASSY && this.isGrounded() && type === Type.GROUND && move.moveTarget === MoveTarget.ALL_NEAR_OTHERS)
             power.value /= 2;
           applyMoveAttrs(VariablePowerAttr, source, this, move, power);
@@ -1383,7 +1384,7 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
           if (!isCritical) {
             this.scene.arena.applyTagsForSide(WeakenMoveScreenTag, this.isPlayer() ? ArenaTagSide.PLAYER : ArenaTagSide.ENEMY, move.category, this.scene.currentBattle.double, screenMultiplier);
           } 
-          const isTypeImmune = (typeMultiplier.value * arenaAttackTypeMultiplier) === 0;
+          const isTypeImmune = (typeMultiplier.value * arenaAttackTypeMultiplier.value) === 0;
           const sourceTypes = source.getTypes();
           const matchesSourceType = sourceTypes[0] === type || (sourceTypes.length > 1 && sourceTypes[1] === type);
           let stabMultiplier = new Utils.NumberHolder(1);
@@ -1401,7 +1402,7 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
           applyMoveAttrs(VariableDefAttr, source, this, move, targetDef);
 
           if (!isTypeImmune) {
-            damage.value = Math.ceil(((((2 * source.level / 5 + 2) * power.value * sourceAtk.value / targetDef.value) / 50) + 2) * stabMultiplier.value * typeMultiplier.value * arenaAttackTypeMultiplier * screenMultiplier.value * ((this.scene.randBattleSeedInt(15) + 85) / 100) * criticalMultiplier.value);
+            damage.value = Math.ceil(((((2 * source.level / 5 + 2) * power.value * sourceAtk.value / targetDef.value) / 50) + 2) * stabMultiplier.value * typeMultiplier.value * arenaAttackTypeMultiplier.value * screenMultiplier.value * ((this.scene.randBattleSeedInt(15) + 85) / 100) * criticalMultiplier.value);
             if (isPhysical && source.status && source.status.effect === StatusEffect.BURN) {
               const burnDamageReductionCancelled = new Utils.BooleanHolder(false);
               applyAbAttrs(BypassBurnDamageReductionAbAttr, source, burnDamageReductionCancelled);