Hail & Wind Storms in San Tan Valley, AZ — Latest Dates and Sizes
Hail and wind activity within ~25 miles of San Tan Valley, Arizona or recorded for its county: the last 12 months from NWS warnings, storm reports, and station measurements, plus official NOAA records back to 2010.
Latest hail and wind near San Tan Valley
- Last reported hail (0.75 in.+, screening): November 19, 2025 — 1.00 in. reported 22.8 mi NW of San Tan Valley (2 E Tempe), NWS Local Storm Report.
- Last wind gust 45 mph+ (screening): September 16, 2026 — 55 mph measured at the Mesa/Falcon Field station (21.1 mi NW of San Tan Valley) at 11:44 AM MST, ASOS weather station.
- 2026 so far: no hail days and 9 wind days within 25 miles (days with a storm report or station gust at the screening thresholds; warnings alone never count).
| Date | Largest reported hail | Strongest gust |
|---|---|---|
| September 16, 2026 | — | 55 mph measured |
| September 14, 2026 | — | 58 mph measured |
| August 30, 2026 | — | 55 mph measured |
| August 19, 2026 | — | 63 mph measured |
| August 12, 2026 | — | 52 mph measured |
| August 9, 2026 | — | 53 mph measured |
| July 20, 2026 | — | 53 mph measured |
| July 13, 2026 | — | 60 mph reported |
| March 29, 2026 | — | 46 mph measured |
| November 19, 2025 | 1.00 in. reported | — |
Was your address hit on September 16, 2026? Check any address free with the Free Report Snapshot — a YES/NO estimate at the screening thresholds.
San Tan Valley storm facts
- StormAuditor's analysis of NOAA and National Weather Service records found 81 wind and hail events, NWS warning products included, within 25 miles of San Tan Valley, Arizona or recorded for Pinal County in the 12 months ending October 7, 2026 (49 wind, 32 hail).
- The strongest gust within 25 miles of San Tan Valley in the last 12 months was 63 mph, measured 9.1 mi NW of San Tan Valley (1 SE Phoenix Mesa Gatew) on August 19, 2026 (NWS Local Storm Report; storm reports and station gusts only, warnings excluded).
- The largest hail reported within 25 miles of San Tan Valley in the last 12 months was 2.00 in., 14.7 mi N of San Tan Valley (2 S Apache Junction) on October 13, 2025 (NWS Local Storm Report).
- The busiest day by event count near San Tan Valley was August 19, 2026, with 7 events.
- Pinal County alone recorded 72 of those wind and hail events (43 wind, 29 hail); the Arizona page ranks counties by events of every type, floods and Special Weather Statements included.
San Tan Valley, Arizona storm history at a glance (last 12 months)
This free weather history for San Tan Valley — home to about 110,000 residents — draws on StormAuditor's consolidated public record: 81 wind and hail events within 25 miles of San Tan Valley or recorded for Pinal County in the trailing 12 months — 49 wind and 32 hail.
Events combine NWS warning products, observed Local Storm Reports, station measurements and official NCEI records in one event table. Because they include warnings, and wind covers thunderstorm and non-thunderstorm wind alike, they measure something different from the NCEI entry counts in the history section below; the two are not comparable year to year.
Busiest days near San Tan Valley by event count
Ranked by the number of 12-month events, NWS warnings included, so a day with many warnings can outrank a day with larger hail.
- August 19, 2026 — 7 events incl. warnings · 6 wind · 1 hail
- August 30, 2026 — 6 events incl. warnings · 4 wind · 2 hail
- September 14, 2026 — 5 events incl. warnings · 3 wind · 2 hail
- August 23, 2026 — 5 events incl. warnings · 4 wind · 1 hail
- August 9, 2026 — 5 events incl. warnings · 4 wind · 1 hail
How these numbers are counted
The storm numbers on this page are counted in four different ways, plus the free address check. Each answers a different question with its own size cutoffs, area and time span, so compare numbers within one group, not across groups.
- Storm days (latest hail and wind): A day in the last 12 months when at least one report within 25 miles of San Tan Valley showed hail 0.75 in. or larger or wind of 45 mph or more (StormAuditor screening thresholds). Reports are NWS storm reports from spotters, the public and officials, plus weather-station gusts, which count from 50 mph. A warning on its own never makes a storm day. The latest and largest hail, the latest and strongest gust, and the storm-day table all use this record.
- Storm-date pages (NWS severe): A storm-date page is published only when at least one report or station gust within 25 miles of a city met the National Weather Service severe criteria (hail 1.00 in. or larger, or wind 58 mph or more), at least two separate observations were logged, and the day ranks among the most significant. A storm report that relays an airport weather station's reading (the same station, the same gust and the same time) counts once, as the station reading. Not every storm day gets a page; when one does, the page and the storm-day table show the same largest hail and strongest gust.
- Events (12-month counts): Events count NWS warnings, storm reports (wind 50 mph+, hail 0.75 in.+), station gusts (50 mph+) and NCEI entries within 25 miles of San Tan Valley or recorded for Pinal County, tornado entries counted as wind. One event is one place on one day, counted separately for hail and for wind. A weather station or storm-report point counts once a day, at that day's highest reading, however many readings it filed; a place with hail and wind on the same day is two events. NWS warnings count once per county per day, and each NCEI entry once per place per day. A storm report that relays an airport weather station's reading (the same station, the same gust and the same time) counts once, as the station reading. The same report arriving through another feed (SPC or NCEI) is one record. Events measure how busy the area was, not whether a storm hit: one storm can bring warnings and reports from many places, so the busiest days by event count can differ from the storm days.
- NOAA history (since 2010): The official NOAA storm record (NCEI Storm Events) within 25 miles of San Tan Valley or in Pinal County from January 1, 2010 to the day before the 12-month window starts: hail 0.50 in.+, thunderstorm wind 40 mph+ and tornadoes. It is a separate, older record with its own "storm days" (days with any entry), so its counts are not compared with the 12-month numbers.
- Free Report Snapshot: A free YES/NO estimate for one address, from radar and wind analysis at the property rather than area reports, at the same screening thresholds: hail 0.75 in. or wind 45 mph.
Full method: Methodology and Data Sources.
San Tan Valley hail and wind history in NOAA NCEI records, 2010–Oct. 2025
This section covers January 1, 2010 through October 6, 2025. Storms from October 7, 2025 on are in the 12-month summary above, so no date is counted in both.
The National Centers for Environmental Information logged 177 storm days within 25 miles of San Tan Valley or in Pinal County in this period — 554 NCEI Storm Events entries in all. Thunderstorm wind outnumbers hail about 7.9 to 1 here: 484 wind reports against 61 hail reports.
The most storm days came in 2022, with 20; the fewest in a full year was 5, in 2020. Across 2022–2024, the area averaged 14 storm days a year, above the 15-year average of 11.
On October 5, 2010, 3.00 in. (teacup size) hail was reported in Maricopa County — the largest in these records for this area. Hail of 2 inches or more appears in only one year of this record, 2010. The strongest measured thunderstorm gust was 81 mph, reached in 2015, 2018 and 2023 — most recently on September 12, 2023 in Maricopa County. NCEI also lists 9 tornado entries for the area — one entry per county a tornado crossed.
Hail peaks in September and October, tied at 20 reports each, while thunderstorm wind reports cluster in July. December through February accounts for 4 storm days.
- Average: 11 storm days a year (2010–2024)
- Most hail reports in one year: 11 in 2018
- Hail of 1 in. or larger reported in 12 of 15 full years (2010–2024)
| Year | Hail reports | Thunderstorm wind reports | Tornado entries | Storm days | Largest hail | Strongest measured gust |
|---|---|---|---|---|---|---|
| 2010 | 2 | 26 | 0 | 10 | 3.00 in. | — |
| 2011 | 2 | 34 | 0 | 12 | 1.00 in. | 69 mph |
| 2012 | 2 | 21 | 0 | 12 | 1.00 in. | 67 mph |
| 2013 | 3 | 25 | 0 | 11 | 1.00 in. | 70 mph |
| 2014 | 1 | 25 | 1 | 10 | 1.00 in. | 72 mph |
| 2015 | 3 | 32 | 0 | 15 | 1.75 in. | 81 mph |
| 2016 | 4 | 11 | 0 | 8 | 1.75 in. | 71 mph |
| 2017 | 0 | 10 | 0 | 6 | — | 60 mph |
| 2018 | 11 | 43 | 0 | 13 | 1.75 in. | 81 mph |
| 2019 | 3 | 16 | 5 | 10 | 1.00 in. | 64 mph |
| 2020 | 2 | 17 | 0 | 5 | 0.88 in. | 58 mph |
| 2021 | 4 | 63 | 0 | 16 | 1.00 in. | 72 mph |
| 2022 | 8 | 71 | 2 | 20 | 1.50 in. | 75 mph |
| 2023 | 4 | 45 | 0 | 10 | 1.00 in. | 81 mph |
| 2024 | 4 | 23 | 1 | 12 | 0.75 in. | 60 mph |
| 2025 through Oct. 6 | 8 | 22 | 0 | 7 | 1.50 in. | 66 mph |
Download this history: CSV · JSON at https://www.stormauditor.com/downloads/storm-history/az/san-tan-valley.json (free, open license, cite StormAuditor).
Source: NOAA NCEI Storm Events Database (thunderstorm wind, hail, and tornado entries; hail 0.50 in. or larger, wind 40 mph or more; wind converted from knots).
San Tan Valley storm history questions, 2010–Oct. 2025
How big did hail get in San Tan Valley, 2010–Oct. 2025?
3.00 in., teacup size, reported on October 5, 2010 in Maricopa County, per NCEI.
Which year had the most storm days near San Tan Valley, 2010–Oct. 2025?
2022, with 20 storm days (8 hail reports, 71 thunderstorm wind reports, 2 tornado entries). The 15-year average is 11 storm days.
How many hail reports does San Tan Valley see in a typical year?
About 3.5 hail reports a year (2010–2024 average), with 1-inch or larger hail in 12 of 15 years. Thunderstorm wind averages 31 reports a year.
What month has the most hail near San Tan Valley?
September and October tie for the most hail reports (20 each, 2010–Oct. 2025).
What is the strongest measured thunderstorm gust near San Tan Valley, 2010–Oct. 2025?
81 mph, reached in 2015, 2018 and 2023; most recently measured on September 12, 2023 in Maricopa County. Only gusts NCEI lists as measured count here; gusts measured on a date and county with a tornado entry, and entries of 120 knots or more (known entry errors), are left out.
San Tan Valley hail map and wind map
Researching hail or wind in San Tan Valley? The Hail Explorer and Wind Explorer map radar-derived hail swaths and peak-gust wind swaths across Arizona, including the San Tan Valley metro: pick any storm date and see how estimated hail size and gust bands tracked through Pinal County. Both explorers are included with Pro+ and Organization plans.
County-level activity is on the Impact Heatmap (free with an account), and day-by-day history is on the Storm Calendar (Pro plans and higher).
Free San Tan Valley weather report by address
Area maps show where storms tracked; an insurance claim or roof inspection turns on what happened at the property. Three ways to check one San Tan Valley address:
- The Free Report Snapshot answers YES/NO instantly on estimated wind of 45 mph or more and hail of 0.75 in. or larger (screening thresholds) at the address.
- The free Address Lookup lists NWS warnings, storm reports and NOAA observations near the address — free San Tan Valley wind history and free San Tan Valley hail history.
- A complete Weather Report for $2.99 covers every qualifying storm date at one address over the last 2 years.
All values are estimates from public NOAA data under our published methodology (see Limitations).
For roofers, adjusters, and claim attorneys: the professional tools add statewide hail and wind swath maps, the Zone Canvas Tool, and Audit Reports with the evidence and arithmetic — see how roofing contractors and insurance claim attorneys use them.
Sources: NWS alerts (api.weather.gov) · NWS Local Storm Reports via the Iowa Environmental Mesonet · ASOS/AWOS station gusts via the Iowa Environmental Mesonet · NOAA NCEI Storm Events Database · every StormAuditor data source.
Free San Tan Valley storm data download
The San Tan Valley storm records for the last 12 months download free, free to reuse under the data license: download CSV · JSON at https://www.stormauditor.com/downloads/storm-data/az/san-tan-valley.json.
- Coverage: every wind and hail record within about 25 miles of San Tan Valley or recorded for Pinal County, with dates, counties, event types, measured gusts and hail sizes.
- Rows: each source record before consolidation, including every NWS warning product and smaller storm reports, so the row count differs from the event counts above.
- Statewide files are on the Arizona storm data page.
Nearby city storm pages:
- Queen Creek hail & wind history
- Gilbert hail & wind history
- Apache Junction hail & wind history
- Chandler hail & wind history
- Mesa hail & wind history
- Casa Grande hail & wind history
- Arizona statewide storm data
Guides for reading this data
Cite or link to this data — free
Free to quote, summarize, reuse, and link — for bloggers, journalists, researchers, contractors, and AI writing tools. No permission or credit required. A ready-made citation and link are below if they help. Terms: StormAuditor data & content license.
Citation: StormAuditor. "San Tan Valley, AZ Hail & Wind Storm History." Updated September 29, 2026. https://www.stormauditor.com/storm-data/az/san-tan-valley
HTML link: <a href="https://www.stormauditor.com/storm-data/az/san-tan-valley">San Tan Valley, AZ Hail & Wind Storm History — StormAuditor</a>
About this page: built by Storm Auditor LLC from public NOAA/NWS records — deduplicated warnings, storm reports, station measurements, and official records on a rolling 12-month window, under the published methodology. See the StormAuditor Editorial Team for how content is produced.
Data last refreshed October 7, 2026. Event counts cover wind and hail (warning products, and storm reports from 50 mph or 0.75 in.); flood activity and Special Weather Statements are not counted here.