diff --git a/asm/coord_event_weather.s b/asm/coord_event_weather.s
deleted file mode 100644
index 7c1188ad6..000000000
--- a/asm/coord_event_weather.s
+++ /dev/null
@@ -1,156 +0,0 @@
-	.include "asm/macros.inc"
-	.include "constants/constants.inc"
-
-	.syntax unified
-
-	.text
-
-	thumb_func_start sub_809D7BC
-sub_809D7BC: @ 809D7BC
-	push {lr}
-	movs r0, 0x1
-	bl sub_80AEDF0
-	pop {r0}
-	bx r0
-	thumb_func_end sub_809D7BC
-
-	thumb_func_start sub_809D7C8
-sub_809D7C8: @ 809D7C8
-	push {lr}
-	movs r0, 0x2
-	bl sub_80AEDF0
-	pop {r0}
-	bx r0
-	thumb_func_end sub_809D7C8
-
-	thumb_func_start sub_809D7D4
-sub_809D7D4: @ 809D7D4
-	push {lr}
-	movs r0, 0x3
-	bl sub_80AEDF0
-	pop {r0}
-	bx r0
-	thumb_func_end sub_809D7D4
-
-	thumb_func_start sub_809D7E0
-sub_809D7E0: @ 809D7E0
-	push {lr}
-	movs r0, 0x4
-	bl sub_80AEDF0
-	pop {r0}
-	bx r0
-	thumb_func_end sub_809D7E0
-
-	thumb_func_start sub_809D7EC
-sub_809D7EC: @ 809D7EC
-	push {lr}
-	movs r0, 0x5
-	bl sub_80AEDF0
-	pop {r0}
-	bx r0
-	thumb_func_end sub_809D7EC
-
-	thumb_func_start sub_809D7F8
-sub_809D7F8: @ 809D7F8
-	push {lr}
-	movs r0, 0x6
-	bl sub_80AEDF0
-	pop {r0}
-	bx r0
-	thumb_func_end sub_809D7F8
-
-	thumb_func_start sub_809D804
-sub_809D804: @ 809D804
-	push {lr}
-	movs r0, 0x9
-	bl sub_80AEDF0
-	pop {r0}
-	bx r0
-	thumb_func_end sub_809D804
-
-	thumb_func_start sub_809D810
-sub_809D810: @ 809D810
-	push {lr}
-	movs r0, 0x7
-	bl sub_80AEDF0
-	pop {r0}
-	bx r0
-	thumb_func_end sub_809D810
-
-	thumb_func_start sub_809D81C
-sub_809D81C: @ 809D81C
-	push {lr}
-	movs r0, 0x8
-	bl sub_80AEDF0
-	pop {r0}
-	bx r0
-	thumb_func_end sub_809D81C
-
-	thumb_func_start sub_809D828
-sub_809D828: @ 809D828
-	push {lr}
-	movs r0, 0xB
-	bl sub_80AEDF0
-	pop {r0}
-	bx r0
-	thumb_func_end sub_809D828
-
-	thumb_func_start sub_809D834
-sub_809D834: @ 809D834
-	push {lr}
-	movs r0, 0xC
-	bl sub_80AEDF0
-	pop {r0}
-	bx r0
-	thumb_func_end sub_809D834
-
-	thumb_func_start sub_809D840
-sub_809D840: @ 809D840
-	push {lr}
-	movs r0, 0x14
-	bl sub_80AEDF0
-	pop {r0}
-	bx r0
-	thumb_func_end sub_809D840
-
-	thumb_func_start sub_809D84C
-sub_809D84C: @ 809D84C
-	push {lr}
-	movs r0, 0x15
-	bl sub_80AEDF0
-	pop {r0}
-	bx r0
-	thumb_func_end sub_809D84C
-
-	thumb_func_start trigger_activate_weather
-trigger_activate_weather: @ 809D858
-	push {r4,lr}
-	lsls r0, 24
-	lsrs r4, r0, 24
-	movs r2, 0
-	ldr r3, =gUnknown_085102E0
-_0809D862:
-	lsls r1, r2, 3
-	adds r0, r1, r3
-	ldrb r0, [r0]
-	cmp r0, r4
-	bne _0809D87C
-	adds r0, r3, 0x4
-	adds r0, r1, r0
-	ldr r0, [r0]
-	bl _call_via_r0
-	b _0809D886
-	.pool
-_0809D87C:
-	adds r0, r2, 0x1
-	lsls r0, 24
-	lsrs r2, r0, 24
-	cmp r2, 0xC
-	bls _0809D862
-_0809D886:
-	pop {r4}
-	pop {r0}
-	bx r0
-	thumb_func_end trigger_activate_weather
-
-	.align 2, 0 @ Don't pad with nop.
diff --git a/asm/field_control_avatar.s b/asm/field_control_avatar.s
index e0e7b5efb..89e6efa6a 100644
--- a/asm/field_control_avatar.s
+++ b/asm/field_control_avatar.s
@@ -2155,7 +2155,7 @@ trigger_activate: @ 809D04C
 	cmp r1, 0
 	bne _0809D062
 	ldrb r0, [r4, 0x6]
-	bl trigger_activate_weather
+	bl DoCoordEventWeather
 	b _0809D082
 _0809D062:
 	ldrh r0, [r4, 0x6]
diff --git a/asm/field_screen.s b/asm/field_screen.s
index 6b49b9c7c..7b0667980 100644
--- a/asm/field_screen.s
+++ b/asm/field_screen.s
@@ -2339,43 +2339,43 @@ _080AC290:
 	.4byte _080AC300
 _080AC2B8:
 	movs r0, 0x1
-	bl sub_80AEDF0
+	bl SetWeather
 	b _080AC306
 _080AC2C0:
 	movs r0, 0x2
-	bl sub_80AEDF0
+	bl SetWeather
 	b _080AC306
 _080AC2C8:
 	movs r0, 0x3
-	bl sub_80AEDF0
+	bl SetWeather
 	b _080AC306
 _080AC2D0:
 	movs r0, 0x4
-	bl sub_80AEDF0
+	bl SetWeather
 	b _080AC306
 _080AC2D8:
 	movs r0, 0x5
-	bl sub_80AEDF0
+	bl SetWeather
 	b _080AC306
 _080AC2E0:
 	movs r0, 0x6
-	bl sub_80AEDF0
+	bl SetWeather
 	b _080AC306
 _080AC2E8:
 	movs r0, 0x9
-	bl sub_80AEDF0
+	bl SetWeather
 	b _080AC306
 _080AC2F0:
 	movs r0, 0x7
-	bl sub_80AEDF0
+	bl SetWeather
 	b _080AC306
 _080AC2F8:
 	movs r0, 0x8
-	bl sub_80AEDF0
+	bl SetWeather
 	b _080AC306
 _080AC300:
 	movs r0, 0xB
-	bl sub_80AEDF0
+	bl SetWeather
 _080AC306:
 	pop {r0}
 	bx r0
@@ -7561,8 +7561,8 @@ sub_80AEDBC: @ 80AEDBC
 	.pool
 	thumb_func_end sub_80AEDBC
 
-	thumb_func_start sub_80AEDF0
-sub_80AEDF0: @ 80AEDF0
+	thumb_func_start SetWeather
+SetWeather: @ 80AEDF0
 	push {lr}
 	bl SetSav1Weather
 	bl GetSav1Weather
@@ -7571,7 +7571,7 @@ sub_80AEDF0: @ 80AEDF0
 	bl weather_set
 	pop {r0}
 	bx r0
-	thumb_func_end sub_80AEDF0
+	thumb_func_end SetWeather
 
 	thumb_func_start sub_80AEE08
 sub_80AEE08: @ 80AEE08
diff --git a/data/coord_event_weather.s b/data/coord_event_weather.s
deleted file mode 100644
index c7b995912..000000000
--- a/data/coord_event_weather.s
+++ /dev/null
@@ -1,21 +0,0 @@
-    .include "asm/macros.inc"
-    .include "constants/constants.inc"
-
-    .section .rodata
-    .align 2, 0
-
-gUnknown_085102E0:: @ 85102E0
-	.4byte 0x00000001, sub_809D7BC
-	.4byte 0x00000002, sub_809D7C8
-	.4byte 0x00000003, sub_809D7D4
-	.4byte 0x00000004, sub_809D7E0
-	.4byte 0x00000005, sub_809D7EC
-	.4byte 0x00000006, sub_809D7F8
-	.4byte 0x00000007, sub_809D804
-	.4byte 0x00000008, sub_809D810
-	.4byte 0x00000009, sub_809D81C
-	.4byte 0x0000000a, sub_809D828
-	.4byte 0x0000000b, sub_809D834
-	.4byte 0x00000014, sub_809D840
-	.4byte 0x00000015, sub_809D84C
-
diff --git a/include/constants/weather.h b/include/constants/weather.h
new file mode 100644
index 000000000..953cc2753
--- /dev/null
+++ b/include/constants/weather.h
@@ -0,0 +1,39 @@
+#ifndef GUARD_CONSTANTS_WEATHER_H
+#define GUARD_CONSTANTS_WEATHER_H
+
+#define WEATHER_NONE           0
+#define WEATHER_CLOUDS         1
+#define WEATHER_SUNNY          2
+#define WEATHER_RAIN_LIGHT     3
+#define WEATHER_SNOW           4
+#define WEATHER_RAIN_MED       5
+#define WEATHER_FOG_1          6
+#define WEATHER_ASH            7
+#define WEATHER_SANDSTORM      8
+#define WEATHER_FOG_2          9
+#define WEATHER_FOG_3          10
+#define WEATHER_SHADE          11
+#define WEATHER_DROUGHT        12
+#define WEATHER_RAIN_HEAVY     13
+#define WEATHER_BUBBLES        14
+#define WEATHER_ROUTE119_CYCLE 20
+#define WEATHER_ROUTE123_CYCLE 21
+
+// These are used in maps' coord_weather_event entries.
+// They are not a one-to-one mapping with the engine's
+// internal weather constants above.
+#define COORD_EVENT_WEATHER_CLOUDS         1
+#define COORD_EVENT_WEATHER_SUNNY          2
+#define COORD_EVENT_WEATHER_RAIN_LIGHT     3
+#define COORD_EVENT_WEATHER_SNOW           4
+#define COORD_EVENT_WEATHER_RAIN_MED       5
+#define COORD_EVENT_WEATHER_FOG_1          6
+#define COORD_EVENT_WEATHER_FOG_2          7
+#define COORD_EVENT_WEATHER_ASH            8
+#define COORD_EVENT_WEATHER_SANDSTORM      9
+#define COORD_EVENT_WEATHER_SHADE          10
+#define COORD_EVENT_WEATHER_DROUGHT        11
+#define COORD_EVENT_WEATHER_ROUTE119_CYCLE 20
+#define COORD_EVENT_WEATHER_ROUTE123_CYCLE 21
+
+#endif // GUARD_CONSTANTS_WEATHER_H
diff --git a/include/coord_event_weather.h b/include/coord_event_weather.h
new file mode 100644
index 000000000..86fb48793
--- /dev/null
+++ b/include/coord_event_weather.h
@@ -0,0 +1,6 @@
+#ifndef GUARD_COORD_EVENT_WEATHER_H
+#define GUARD_COORD_EVENT_WEATHER_H
+
+void DoCoordEventWeather(u8);
+
+#endif // GUARD_COORD_EVENT_WEATHER_H
diff --git a/include/field_weather.h b/include/field_weather.h
index e12107e70..b39af437b 100644
--- a/include/field_weather.h
+++ b/include/field_weather.h
@@ -6,6 +6,7 @@ void fade_screen(u8, s8);
 void SetSav1Weather(u32);
 u8 GetSav1Weather(void);
 void sub_80AEDBC(void);
+void SetWeather(u32);
 
 void DoCurrentWeather(void);
 
diff --git a/ld_script.txt b/ld_script.txt
index f2a9d8196..2d65114f7 100644
--- a/ld_script.txt
+++ b/ld_script.txt
@@ -105,7 +105,7 @@ SECTIONS {
         src/scrcmd.o(.text);
         asm/field_control_avatar.o(.text);
         src/event_data.o(.text);
-        asm/coord_event_weather.o(.text);
+        src/coord_event_weather.o(.text);
         asm/field_tasks.o(.text);
         src/clock.o(.text);
         asm/reset_rtc_screen.o(.text);
@@ -407,7 +407,7 @@ SECTIONS {
         data/map_obj_8097404.o(.rodata);
         src/text_window.o(.rodata);
         src/scrcmd.o(.rodata);
-        data/coord_event_weather.o(.rodata);
+        src/coord_event_weather.o(.rodata);
         data/field_tasks.o(.rodata);
         data/reset_rtc_screen.o(.rodata);
         src/start_menu.o(.rodata);
diff --git a/src/coord_event_weather.c b/src/coord_event_weather.c
new file mode 100644
index 000000000..60b87fa30
--- /dev/null
+++ b/src/coord_event_weather.c
@@ -0,0 +1,119 @@
+#include "global.h"
+#include "constants/weather.h"
+#include "coord_event_weather.h"
+#include "field_weather.h"
+
+struct CoordEventWeather
+{
+    u8 coordEventWeather;
+    void (*func)(void);
+};
+
+static void CoordEventWeather_Clouds(void);
+static void CoordEventWeather_Sunny(void);
+static void CoordEventWeather_LightRain(void);
+static void CoordEventWeather_Snow(void);
+static void CoordEventWeather_Thunderstorm(void);
+static void CoordEventWeather_Fog(void);
+static void CoordEventWeather_DiagonalFog(void);
+static void CoordEventWeather_Ash(void);
+static void CoordEventWeather_Sandstorm(void);
+static void CoordEventWeather_Dark(void);
+static void CoordEventWeather_Drought(void);
+static void CoordEventWeather_Route119Cycle(void);
+static void CoordEventWeather_Route123Cycle(void);
+
+static const struct CoordEventWeather sCoordEventWeatherFuncs[] =
+{
+    { COORD_EVENT_WEATHER_CLOUDS, CoordEventWeather_Clouds },
+    { COORD_EVENT_WEATHER_SUNNY, CoordEventWeather_Sunny },
+    { COORD_EVENT_WEATHER_RAIN_LIGHT, CoordEventWeather_LightRain },
+    { COORD_EVENT_WEATHER_SNOW, CoordEventWeather_Snow },
+    { COORD_EVENT_WEATHER_RAIN_MED, CoordEventWeather_Thunderstorm },
+    { COORD_EVENT_WEATHER_FOG_1, CoordEventWeather_Fog },
+    { COORD_EVENT_WEATHER_FOG_2, CoordEventWeather_DiagonalFog },
+    { COORD_EVENT_WEATHER_ASH, CoordEventWeather_Ash },
+    { COORD_EVENT_WEATHER_SANDSTORM, CoordEventWeather_Sandstorm },
+    { COORD_EVENT_WEATHER_SHADE, CoordEventWeather_Dark },
+    { COORD_EVENT_WEATHER_DROUGHT, CoordEventWeather_Drought },
+    { COORD_EVENT_WEATHER_ROUTE119_CYCLE, CoordEventWeather_Route119Cycle },
+    { COORD_EVENT_WEATHER_ROUTE123_CYCLE, CoordEventWeather_Route123Cycle },
+};
+
+static void CoordEventWeather_Clouds(void)
+{
+    SetWeather(WEATHER_CLOUDS);
+}
+
+static void CoordEventWeather_Sunny(void)
+{
+    SetWeather(WEATHER_SUNNY);
+}
+
+static void CoordEventWeather_LightRain(void)
+{
+    SetWeather(WEATHER_RAIN_LIGHT);
+}
+
+static void CoordEventWeather_Snow(void)
+{
+    SetWeather(WEATHER_SNOW);
+}
+
+static void CoordEventWeather_Thunderstorm(void)
+{
+    SetWeather(WEATHER_RAIN_MED);
+}
+
+static void CoordEventWeather_Fog(void)
+{
+    SetWeather(WEATHER_FOG_1);
+}
+
+static void CoordEventWeather_DiagonalFog(void)
+{
+    SetWeather(WEATHER_FOG_2);
+}
+
+static void CoordEventWeather_Ash(void)
+{
+    SetWeather(WEATHER_ASH);
+}
+
+static void CoordEventWeather_Sandstorm(void)
+{
+    SetWeather(WEATHER_SANDSTORM);
+}
+
+static void CoordEventWeather_Dark(void)
+{
+    SetWeather(WEATHER_SHADE);
+}
+
+static void CoordEventWeather_Drought(void)
+{
+    SetWeather(WEATHER_DROUGHT);
+}
+
+static void CoordEventWeather_Route119Cycle(void)
+{
+    SetWeather(WEATHER_ROUTE119_CYCLE);
+}
+
+static void CoordEventWeather_Route123Cycle(void)
+{
+    SetWeather(WEATHER_ROUTE123_CYCLE);
+}
+
+void DoCoordEventWeather(u8 coordEventWeather)
+{
+    u8 i;
+    for (i = 0; i < ARRAY_COUNT(sCoordEventWeatherFuncs); i++)
+    {
+        if (sCoordEventWeatherFuncs[i].coordEventWeather == coordEventWeather)
+        {
+            sCoordEventWeatherFuncs[i].func();
+            return;
+        }
+    }
+}