I know in the East Coast in the Eastern Time, it's impossible to get 1 hour newscast on the weekend evenings due to sports overrun and Sports program tends to end on 6pm/5 central on weekends, plus you got prime time starts on 7pm/6 central on Sundays. Here are some of the Top 100 markets from Hawaii to Mountain Time Zone that have more than 1/2 of evening news on the weekends.
West coast weekend news (HI/AK/PT and MT) (Top 100 Markets).
Seattle
KOMO ABC 5-530p, 6-7p, 5-530p, 6-7p
KING NBC 5-6p, 630-7p, 5-6p, 630-7p
KIRO CBS 5-6p, 630p-7p, 5-6p, 630-7p
KCPQ None
Spokane
KREM CBS 5-530p, 6-630p
KXLY ABC 5-530p, 6-630p, (no 11pm news on sat nights), 5-530p, 6-630p
KHQ NBC 5-530p, 6-630p
Portland
KATU ABC 5-530p, 6-630p, (Sat) 5-530p, 6-7p (Sun)
KOIN CBS 6-630p only (Sat-Sun)
KGW NBC 5-530p (530-6p repeats) (Sat-Sun)
KPTV FOX None
Sacramento
KCRA NBC 5-530p, 6-630p (Sat-Sun)
KXTV ABC 6-630p (Sat only), 5-530p, 6-630p (Sat & Sun)
KOVR CBS 5-530p (Sat & Sun), 10-11p (Sat & Sun)
KTXL FOX 5-6p (Sat Only)
San Francisco
KTVU FOX 6-630p Sat, 5-6p (sun)
KRON MNT none
KPIX 530-6p, 630-7p (Sat & Sun)
KGO 5-530p, 6-630p (Sat & Sun)
KNTV 5-530p, 6-630p (Sat & Sun)
Fresno - None
Los Angeles
KCBS CBS Sat 5-530p, 6-630p, Sun, 5-530p, 6-7p
KNBC NBC Sat & Sun 5-530p, 6-7p
KTLA CW Sat & Sun 5-6p
KABC ABC Sat & Sun 4-530p, 6-630p
KTTV FOX Sat & Sun 5-6p
San Diego
XETV None
KFMB 5-6p, 630-7p (Sat & Sun)
KGTV 5-530p, 6-630p (Sat & Sun)
KNSD 6-630p only (Sat & Sun)
KUSI Sat & Sun 6-7p
Las Vegas
KSNV NBC Sat & Sun 5-530p, 6-630p
KVVU FOX None
KLAS CBS Sat Only 5-530p, Sun 5-530p, 630-7p Sun Only
KTNV ABC Sat & Sun 5-530p, 6-7p
Denver
KCCO CBS Sat & Sun 5-6p
KMGH ABC Sat & Sun 5-6p
KUSA NBC Sat & Sun 5-6p
KDVR FOX Sat & Sun 5-6p
Honolulu – None
Tucson - None
Phoenix
KTVK IND Sat & Sun 5-530p Only
KPHO CBS Sat 5-530p,530-6p,6-630p, Sun 5-530p Only
KSAZ FOX Sat & Sun 5-6p
KPNX NBC Sat 6-7p, Sun 5-530p Only
KNXV ABC Sat 5-530p, 6-630p Sun 5-530p Only
Albuquerque
KOB NBC Sat 6-7p, Sun, 5-530p Only
KOAT ABC Sat 5-6p, Sun 5-530p Only
KRQE CBS Sat 5-6p, Sun530-6p Only
Salt Lake City
KUTV CBS Sat5-6p, Sun 5-6p
KTVX ABC Sat & Sun 5-530p
KSL NBC Sat 430-530p, Sun, 5-530p
KSTU FOX None
West coast weekend news (HI/AK/PT and MT) (Top 100 Markets).
Seattle
KOMO ABC 5-530p, 6-7p, 5-530p, 6-7p
KING NBC 5-6p, 630-7p, 5-6p, 630-7p
KIRO CBS 5-6p, 630p-7p, 5-6p, 630-7p
KCPQ None
Spokane
KREM CBS 5-530p, 6-630p
KXLY ABC 5-530p, 6-630p, (no 11pm news on sat nights), 5-530p, 6-630p
KHQ NBC 5-530p, 6-630p
Portland
KATU ABC 5-530p, 6-630p, (Sat) 5-530p, 6-7p (Sun)
KOIN CBS 6-630p only (Sat-Sun)
KGW NBC 5-530p (530-6p repeats) (Sat-Sun)
KPTV FOX None
Sacramento
KCRA NBC 5-530p, 6-630p (Sat-Sun)
KXTV ABC 6-630p (Sat only), 5-530p, 6-630p (Sat & Sun)
KOVR CBS 5-530p (Sat & Sun), 10-11p (Sat & Sun)
KTXL FOX 5-6p (Sat Only)
San Francisco
KTVU FOX 6-630p Sat, 5-6p (sun)
KRON MNT none
KPIX 530-6p, 630-7p (Sat & Sun)
KGO 5-530p, 6-630p (Sat & Sun)
KNTV 5-530p, 6-630p (Sat & Sun)
Fresno - None
Los Angeles
KCBS CBS Sat 5-530p, 6-630p, Sun, 5-530p, 6-7p
KNBC NBC Sat & Sun 5-530p, 6-7p
KTLA CW Sat & Sun 5-6p
KABC ABC Sat & Sun 4-530p, 6-630p
KTTV FOX Sat & Sun 5-6p
San Diego
XETV None
KFMB 5-6p, 630-7p (Sat & Sun)
KGTV 5-530p, 6-630p (Sat & Sun)
KNSD 6-630p only (Sat & Sun)
KUSI Sat & Sun 6-7p
Las Vegas
KSNV NBC Sat & Sun 5-530p, 6-630p
KVVU FOX None
KLAS CBS Sat Only 5-530p, Sun 5-530p, 630-7p Sun Only
KTNV ABC Sat & Sun 5-530p, 6-7p
Denver
KCCO CBS Sat & Sun 5-6p
KMGH ABC Sat & Sun 5-6p
KUSA NBC Sat & Sun 5-6p
KDVR FOX Sat & Sun 5-6p
Honolulu – None
Tucson - None
Phoenix
KTVK IND Sat & Sun 5-530p Only
KPHO CBS Sat 5-530p,530-6p,6-630p, Sun 5-530p Only
KSAZ FOX Sat & Sun 5-6p
KPNX NBC Sat 6-7p, Sun 5-530p Only
KNXV ABC Sat 5-530p, 6-630p Sun 5-530p Only
Albuquerque
KOB NBC Sat 6-7p, Sun, 5-530p Only
KOAT ABC Sat 5-6p, Sun 5-530p Only
KRQE CBS Sat 5-6p, Sun530-6p Only
Salt Lake City
KUTV CBS Sat5-6p, Sun 5-6p
KTVX ABC Sat & Sun 5-530p
KSL NBC Sat 430-530p, Sun, 5-530p
KSTU FOX None