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The four weather altering moves have more effects then you may know. So I've listed them all here.

Hail
TM07

R/S/E: Shoal Cave
Colo: Pyrite Colosseum Prize
Fr/Lg: Victory Road

• Halves the power of "Solarbeam"
• Damages all but Ice types
• Works with the "Forecast" ability to change Castform to the Ice type

Rain Dance
TM18

R/S/E: Abandoned Ship
C: Phenac Stadium Prize
Fr/Lg: Route 15

• Raises power of Water type moves
• Makes "Thunder" 100% accurate
• Makes "Moonlight" restore more HP
• Halves the healing power of "Morning Sun"
• Occasionally in effect on Routes 119, 120 (R/S/E)
• In effect on Route 126 during Kyogre's rampages (S/E)
• In effect on Routes 124, 125, 126, 127, 128, 129, 130, 131, Mossdeep City, Sootopolis City, Pacifidlog Town during Kyogre & Groudons rampage (E)
• In effect on Route 105, 125, 127 & 129 after beating the Elite 4 and facing Groudon if the Weather Institute says Kyogre is in one those areas (E)
• Kyogre's "Drizzle" ability puts Rain Dance into effect
• Works with the "Swift Swim" ability to increase speed
• Works with the "Rain Dish" ability to restore HP
• Works with the "Forecast" ability to change Castform to the Water type

Sandstorm
TM37

R/S/E: Route 111
Colo: Under Colosseum Prize
Fr/Lg: Victory Road

• Damages all but Rock, Ground, and Steel types
• Always in effect on Route 111 Desert (R/S)
• Tyranitar's "Sandstream" ability puts Sandstorm into effect
• Works with the "Sand Veil" ability to increase evasion

Sunny Day
TM11

R/S/E: Scorched Slab
Colo: Phenac Stadium Prize
Fr/Lg: Safari Zone

• Raises power of Fire type moves
• Allows "Solarbeam" to be used without charging
• Makes "Morning Sun" restore more HP
• Makes "Synthesis" restore more HP
• In effect on Route 126 during Groudon's rampages (R)
• In effect on Route 114, 115, 116 & 118 after beating the Elite 4 if the Weather Institute says Groudon is in one those areas (E)
• Groudon's "Drought" ability puts Sunny Day into effect
• Works with "Chlorophyll" ability to increase speed
• Works with "Forecast" ability to change Castform to the Fire type