Arizona, 2020Excessive Heat in Arizona, May 28 to 31, 2020
May 28 to 31, 2020 · NWS TWC · 8 events in 8 counties and zones
Very hot temperatures were experienced in parts of southeast Arizona May 28th through the 31st with high temperatures exceeding established records in many locations. No heat-related fatalities were reported.
Every event with a place to put it; 8 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
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- Floods
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- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 8
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
Very hot temperatures were experienced in parts of southeast Arizona May 28th through the 31st with high temperatures exceeding established records in many locations. No heat-related fatalities were reported.
Excessive Heat, Western Pima County
- When
- May 28, 12:00 PM MST to May 31, 8:00 PM MST
- Where
- Western Pima County forecast zone
- Reported by
- Mesonet
- Coordinates
- 32.097, -111.790 (the zone’s center; the record gives no point)
Very hot temperatures 7 to 13 degrees above normal occurred in parts of southeast Arizona, causing the High Heat Risk category to be reached. Several daily high temperature records were tied or broken. Record highs included: May 28th, 107 degrees (tie) at Ajo and 106 at Duncan and Safford Airport; May 29th, 108 degrees at Tucson International Airport, 107 at Fort Thomas and 102 (tie) at San Manuel; May 30th, 111 degrees at Ajo, 109 at Picacho and 106 (tie) at Anvil Ranch; May 31st, 106 degrees (tie) at Green Valley. On May 29th, Sells reached 108 degrees, which was two degrees shy of a record while Picacho topped out at 110, just one degree off the record for the date.
Excessive Heat, Tohono O Odham Nation
- When
- May 28, 12:00 PM MST to May 31, 8:00 PM MST
- Where
- Tohono O Odham Nation forecast zone
- Reported by
- Mesonet
- Coordinates
- 32.501, -111.567 (the zone’s center; the record gives no point)
Very hot temperatures 7 to 13 degrees above normal occurred in parts of southeast Arizona, causing the High Heat Risk category to be reached. Several daily high temperature records were tied or broken. Record highs included: May 28th, 107 degrees (tie) at Ajo and 106 at Duncan and Safford Airport; May 29th, 108 degrees at Tucson International Airport, 107 at Fort Thomas and 102 (tie) at San Manuel; May 30th, 111 degrees at Ajo, 109 at Picacho and 106 (tie) at Anvil Ranch; May 31st, 106 degrees (tie) at Green Valley. On May 29th, Sells reached 108 degrees, which was two degrees shy of a record while Picacho topped out at 110, just one degree off the record for the date.
Excessive Heat, Upper Santa Cruz River and Altar Valleys
- When
- May 28, 12:00 PM MST to May 31, 8:00 PM MST
- Where
- Upper Santa Cruz River and Altar Valleys forecast zone
- Reported by
- Mesonet
- Coordinates
- 31.812, -111.318 (the zone’s center; the record gives no point)
Very hot temperatures 7 to 13 degrees above normal occurred in parts of southeast Arizona, causing the High Heat Risk category to be reached. Several daily high temperature records were tied or broken. Record highs included: May 28th, 107 degrees (tie) at Ajo and 106 at Duncan and Safford Airport; May 29th, 108 degrees at Tucson International Airport, 107 at Fort Thomas and 102 (tie) at San Manuel; May 30th, 111 degrees at Ajo, 109 at Picacho and 106 (tie) at Anvil Ranch; May 31st, 106 degrees (tie) at Green Valley. On May 29th, Sells reached 108 degrees, which was two degrees shy of a record while Picacho topped out at 110, just one degree off the record for the date.
Excessive Heat, Tucson Metro Area
- When
- May 28, 12:00 PM MST to May 31, 8:00 PM MST
- Where
- Tucson Metro Area forecast zone
- Reported by
- Mesonet
- Coordinates
- 32.097, -111.790 (the zone’s center; the record gives no point)
Very hot temperatures 7 to 13 degrees above normal occurred in parts of southeast Arizona, causing the High Heat Risk category to be reached. Several daily high temperature records were tied or broken. Record highs included: May 28th, 107 degrees (tie) at Ajo and 106 at Duncan and Safford Airport; May 29th, 108 degrees at Tucson International Airport, 107 at Fort Thomas and 102 (tie) at San Manuel; May 30th, 111 degrees at Ajo, 109 at Picacho and 106 (tie) at Anvil Ranch; May 31st, 106 degrees (tie) at Green Valley. On May 29th, Sells reached 108 degrees, which was two degrees shy of a record while Picacho topped out at 110, just one degree off the record for the date.
Excessive Heat, South Central Pinal County
- When
- May 28, 12:00 PM MST to May 31, 8:00 PM MST
- Where
- South Central Pinal County forecast zone
- Reported by
- Mesonet
- Coordinates
- 32.904, -111.345 (the zone’s center; the record gives no point)
Very hot temperatures 7 to 13 degrees above normal occurred in parts of southeast Arizona, causing the High Heat Risk category to be reached. Several daily high temperature records were tied or broken. Record highs included: May 28th, 107 degrees (tie) at Ajo and 106 at Duncan and Safford Airport; May 29th, 108 degrees at Tucson International Airport, 107 at Fort Thomas and 102 (tie) at San Manuel; May 30th, 111 degrees at Ajo, 109 at Picacho and 106 (tie) at Anvil Ranch; May 31st, 106 degrees (tie) at Green Valley. On May 29th, Sells reached 108 degrees, which was two degrees shy of a record while Picacho topped out at 110, just one degree off the record for the date.
Excessive Heat, Southeast Pinal County
- When
- May 28, 12:00 PM MST to May 31, 8:00 PM MST
- Where
- Southeast Pinal County forecast zone
- Reported by
- Mesonet
- Coordinates
- 32.904, -111.345 (the zone’s center; the record gives no point)
Very hot temperatures 7 to 13 degrees above normal occurred in parts of southeast Arizona, causing the High Heat Risk category to be reached. Several daily high temperature records were tied or broken. Record highs included: May 28th, 107 degrees (tie) at Ajo and 106 at Duncan and Safford Airport; May 29th, 108 degrees at Tucson International Airport, 107 at Fort Thomas and 102 (tie) at San Manuel; May 30th, 111 degrees at Ajo, 109 at Picacho and 106 (tie) at Anvil Ranch; May 31st, 106 degrees (tie) at Green Valley. On May 29th, Sells reached 108 degrees, which was two degrees shy of a record while Picacho topped out at 110, just one degree off the record for the date.
Excessive Heat, Upper San Pedro River Valley
- When
- May 28, 12:00 PM MST to May 31, 8:00 PM MST
- Where
- Upper San Pedro River Valley forecast zone
- Reported by
- Mesonet
- Coordinates
- 32.109, -110.569 (the zone’s center; the record gives no point)
Very hot temperatures 7 to 13 degrees above normal occurred in parts of southeast Arizona, causing the High Heat Risk category to be reached. Several daily high temperature records were tied or broken. Record highs included: May 28th, 107 degrees (tie) at Ajo and 106 at Duncan and Safford Airport; May 29th, 108 degrees at Tucson International Airport, 107 at Fort Thomas and 102 (tie) at San Manuel; May 30th, 111 degrees at Ajo, 109 at Picacho and 106 (tie) at Anvil Ranch; May 31st, 106 degrees (tie) at Green Valley. On May 29th, Sells reached 108 degrees, which was two degrees shy of a record while Picacho topped out at 110, just one degree off the record for the date.
Excessive Heat, Upper Gila River and Aravaipa Valleys
- When
- May 28, 12:00 PM MST to May 31, 8:00 PM MST
- Where
- Upper Gila River and Aravaipa Valleys forecast zone
- Reported by
- Mesonet
- Coordinates
- 33.074, -109.563 (the zone’s center; the record gives no point)
Very hot temperatures 7 to 13 degrees above normal occurred in parts of southeast Arizona, causing the High Heat Risk category to be reached. Several daily high temperature records were tied or broken. Record highs included: May 28th, 107 degrees (tie) at Ajo and 106 at Duncan and Safford Airport; May 29th, 108 degrees at Tucson International Airport, 107 at Fort Thomas and 102 (tie) at San Manuel; May 30th, 111 degrees at Ajo, 109 at Picacho and 106 (tie) at Anvil Ranch; May 31st, 106 degrees (tie) at Green Valley. On May 29th, Sells reached 108 degrees, which was two degrees shy of a record while Picacho topped out at 110, just one degree off the record for the date.
- Excessive Heat
- Heat at or above the local excessive heat warning criteria, or heat that caused deaths.
After NWS Directive 10-1605, the rules offices file Storm Data by.
- Cold in California, May 28, 20203 deaths · 1 event
- Lightning Strikes and Heavy Rain in Florida, May 28, 20201 death · 2 injured · $35,000 · 6 events
- Rip Current in California, May 28, 20201 death · 1 event
- Flash Flooding and Damaging Winds in North Carolina, May 28, 2020$5.0 million · 50 kt wind · 7 events
- Flash Flood in Michigan, May 28, 2020$310,000 · 1 event
- Tornadoes and Flash Flood in Illinois, May 28, 2020$25,000 · 52 kt wind · 5 events
- Tornado in Oklahoma, May 28, 2020$20,000 · EF0 · 1 event
- Flash Flooding and Flood in West Virginia, May 28, 2020$16,000 · 4 events
- Marine Thunderstorm Winds and Waterspouts in Gulf of Mexico, May 28, 202060 kt wind · 13 events
- Hail and Damaging Wind in Missouri, May 28, 2020$15,000 · 1 in hail · 2 events
- Hail and Damaging Wind in Texas, May 28, 20202 in hail · 10 events
- Flash Flooding and Hail in South Carolina, May 28, 2020$1,000 · 1.25 in hail · 8 events
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-30. Each event’s entry at NCEI: 895856, 895876, 895877, 895878, 895879, 895880, 895881, 895882.