NHC HURDAT2 · SPC Tornado Database
Hurricanes and Tornadoes That Hit San Tan Valley, AZ
Every tropical system within 75 miles since 1851 and every tornado within 25 miles since 1950.
Data: NOAA NHC HURDAT2 and NOAA SPC tornado and hail reports, through 2025 · Updated
No tropical storm or hurricane has passed within 75 miles of San Tan Valley, Arizona since records began in 1851. Since 1950, 29 tornadoes have touched down within 25 miles, 0 of them rated EF3 or stronger.
- Hurricanes
- 0
- Tropical storms
- 0
- Tornadoes
- 29
- EF3 or stronger
- 0
within 75 mi, since 1851
below hurricane strength
within 25 mi, since 1950
no recorded deaths
What the records show for San Tan Valley
The highest rating among the 29 tornadoes within 25 miles is F2, reached 2 times; the most recent, on August 30, 1971, came within 25 miles. Of the 29, 2 had paths within 5 miles of the city centre, and 5 have come since 2000. July has had the most tornadoes, 6. The most recent tornado was on October 16, 2022. San Tan Valley has more tornadoes within 25 miles than 79% of the 134 Arizona cities on this site. Hail has been reported within 10 miles 8 times since 1995, with stones up to 1.75 inches (golf ball size). Of the 134 Arizona cities, 57% have more hail reports within 10 miles than San Tan Valley.
Compare San Tan Valley's storm record with another city →
Tornadoes within 25 miles of San Tan Valley
By decade
- 2020s1
- 2010s4
- 1990s6
- 1980s6
- 1970s9
- 1960s2
- 1950s1
| Date | Rating | Distance | Path | Killed / injured |
|---|---|---|---|---|
| Aug 30, 1971 | F2 | 25 mi | 4.7 mi | 0 / 41 |
| Jul 4, 1968 | F2 | 19 mi | 0.1 mi | 0 / 2 |
| Feb 13, 1995 | F1 | 15 mi | 0.5 mi | 0 / 0 |
| Jan 18, 1993 | F1 | 6 mi | 2 mi | 0 / 0 |
| Jul 20, 1988 | F1 | 24 mi | 0.5 mi | 0 / 0 |
| Nov 18, 1986 | F1 | 18 mi | 0.5 mi | 0 / 0 |
| Mar 15, 1985 | F1 | 14 mi | 0.1 mi | 0 / 0 |
| Jul 22, 1984 | F1 | 18 mi | 1 mi | 0 / 0 |
| May 4, 1976 | F1 | 25 mi | 2 mi | 0 / 0 |
| Oct 18, 1972 | F1 | 18 mi | 0.1 mi | 0 / 0 |
| Sep 10, 1972 | F1 | 23 mi | 1.8 mi | 0 / 1 |
| Sep 1, 1971 | F1 | 5 mi | 32.4 mi | 0 / 0 |
The strongest 12 of 29, by rating and then by deaths. Ratings before February 2007 are on the original Fujita scale.
Hail in San Tan Valley
The Storm Prediction Center has 8 hail reports within 10 miles of San Tan Valley since 1995, made on 7 separate days. Of these, 7 were 1 inch across or larger, and none reached 2 inches. The largest, 1.75 inches (golf ball size), fell on September 28, 1995. The most recent report is from October 16, 2022.
Source: NOAA Storm Prediction Center severe weather reports, data through 2025.
Weather by month in San Tan Valley
The nearest NOAA station with 1991–2020 climate normals is Casa Grande Nm, AZ, 12 miles south of San Tan Valley at 1,419 feet. July is the warmest, with an average high of 107°F and low of 77°F; December is the coolest, at 67°F and 36°F. August is the wettest at 1.2 inches of precipitation on average and June the driest at 0.1 inches; the year adds up to 8.3 inches over 21 days with at least a tenth of an inch. Highs reach 90°F on about 180 days a year, almost all from March to November. Lows fall below freezing on about 29 nights a year. That 8.3 inches is more than at 21 of the 76 Arizona stations used on this site (28%). Gilbert, 14 miles northwest, has its own station (E Mesa, AZ): 11.0 inches a year, 2.7 more than here, and a July average high of 106°F against 107°F.
| Month | High °F | Low °F | Precip. in | Days ≥ 0.1" |
|---|---|---|---|---|
| Jan | 68 | 37 | 1.0 | 2 |
| Feb | 71 | 40 | 1.0 | 3 |
| Mar | 78 | 45 | 0.9 | 2 |
| Apr | 86 | 51 | 0.3 | 1 |
| May | 95 | 59 | 0.2 | 1 |
| Jun | 105 | 68 | 0.1 | 0 |
| Jul | 107 | 77 | 1.1 | 3 |
| Aug | 105 | 77 | 1.2 | 3 |
| Sep | 101 | 70 | 0.7 | 2 |
| Oct | 91 | 56 | 0.5 | 1 |
| Nov | 78 | 44 | 0.5 | 1 |
| Dec | 67 | 36 | 0.8 | 3 |
| Year | 88 | 55 | 8.3 | 21 |
Averages for 1991–2020 at Casa Grande Nm, AZ (1,419 ft), from NOAA NCEI U.S. Climate Normals. Normals describe the station; the farther a place is from it, and the bigger the difference in height, the more its weather can differ.
Floods, thunderstorm wind and lightning near San Tan Valley
Since 1996, the National Weather Service has logged 111 flood, rain, thunderstorm wind and lightning events that began within 10 miles of San Tan Valley: 80 thunderstorm wind reports, 17 flash floods, 11 heavy rain events, 2 lightning strikes and 1 flood. They killed 1 person and injured 2, and the NWS estimated $4.5 million in property and crop damage. The strongest thunderstorm gust on record here was 92 mph, on August 15, 2004. July has had the most flash floods, 6 of 17. Of the 130 Arizona cities on this site with a flash flood on record, 56 have had fewer than San Tan Valley.
July 29, 2012: flash flood 3 miles from the centre of San Tan Valley — 1 killed.
July 23, 2005: thunderstorm wind 7 miles from the centre of San Tan Valley — 1 injured, $200,000 damage.
July 12, 2013: thunderstorm wind 6 miles from the centre of San Tan Valley — 1 injured, $5,000 damage.
Source: NOAA NCEI Storm Events Database, events whose starting point is on record, 1996 to June 30, 2026. Damage is the NWS estimate in the dollars of the year, not insured losses, and NWS notes that some reports are unverified.
Flood insurance claims, disaster declarations and FEMA risk ratings
Pinal County, which includes San Tan Valley, has been named in 23 federal disaster or emergency declarations since 1966, 10 of them major disasters (by incident: 10 fires, 6 floods, 3 severe storms, 2 biological emergencies). The latest major disaster declaration was Covid-19 Pandemic, on April 4, 2020. FEMA's National Risk Index gives Pinal County a Relatively Moderate rating for natural hazard risk overall; by hazard: Very High for lightning; Relatively High for inland flooding and heat waves; Relatively Moderate for hail and strong wind; Relatively Low for tornadoes; Very Low for hurricanes. It models the county's expected loss from all 18 hazards it covers at $137.5 million a year, the 3rd highest of 15 Arizona counties; of the hazards above, the largest share, $92.4 million (67%), is from inland flooding.
Claims: FEMA, OpenFEMA Dataset FIMA NFIP Redacted Claims – v3, summed over ZIP codes; payments in the dollars of each year, not adjusted for inflation. Declarations: Disaster Declarations Summaries – v2, by county. Retrieved October 25, 2026. This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Risk ratings: FEMA, National Risk Index county table, December 2025 (v1.20), retrieved October 26, 2026; ratings compare counties nationwide, are meant for planning and are no substitute for a local risk assessment. This product uses the Federal Emergency Management Agency's National Risk Index dataset API or downloadable datasets but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
What counts as a pass, the distances and the sources: how this storm history is built.
Cities near San Tan Valley
- Queen Creek, AZ1 mi
- Sacaton, AZ12 mi
- Coolidge, AZ14 mi
- Gilbert, AZ14 mi
- Gold Canyon, AZ15 mi
- Apache Junction, AZ16 mi
- Mesa, AZ20 mi
- Casa Grande, AZ20 mi
- Arizona City, AZ21 mi
- Chandler, AZ24 mi
- Florence, AZ24 mi
- Tempe, AZ26 mi
All Arizona cities →All hurricanes since 1851 →Compare San Tan Valley with another place →