Scottsdale records about 193mm of rain across roughly 28 wet days a year, which is a 8% chance on an average day. August is the wettest month at 22mm (11% of the annual total) and June the driest at 1mm. Local rain type: thunderstorms. Scottsdale is desert-dry most of the year. Summer monsoon storms are spectacular but brief — the desert comes alive after rare rain.
Chance of rain on an average day: 8%
Rainfall climatology for Scottsdale. The live hour-by-hour answer for today loads at the top of this page from Open-Meteo and refreshes through the day — the figures below describe a typical year, not today.
Last updated: · Live forecast data refreshes hourly.
| Annual rainfall | 193mm |
| Rain days per year | 28 |
| Odds on an average day | 8% |
| Wettest month | August — 22mm over 4 days |
| Driest month | June — 1mm over 1 days |
| Rain type | thunderstorms |
| Best dry window | October through May offers dry, comfortable to hot conditions. |
| Worst rain window | July and August bring monsoon storms. |
August delivers 2100% more rain than June (22mm vs 1mm). That gap is the difference between planning around showers and ignoring them.
No single month holds more than 11% of the annual total, so rain in Scottsdale is spread through the year — there is no season you can rely on being dry.
Scottsdale rain arrives in short, heavy bursts — shelter and timing matter more than gear.
Rain falls on about 4 days in August against 1 in June — the frequency swing matters more for planning than the millimetre totals.
Climate normals. Use them to judge whether today's live forecast at the top of the page is typical or unusual for the season.
| Month | Rainfall | Rain days | Chance on a given day | Highs |
|---|---|---|---|---|
| January | 18mm | 4 | 13% | 20°C |
| February | 16mm | 3 | 10% | 20°C |
| March | 18mm | 4 | 13% | 23°C |
| April | 5mm | 1 | 3% | 28°C |
| May | 2mm | 1 | 3% | 33°C |
| June | 1mm | 1 | 3% | 38°C |
| July | 20mm | 4 | 13% | 41°C |
| August | 22mm | 4 | 13% | 41°C |
| September | 12mm | 2 | 7% | 38°C |
| October | 8mm | 2 | 7% | 33°C |
| November | 8mm | 2 | 7% | 28°C |
| December | 10mm | 2 | 7% | 23°C |
Rain probability is the chance that at least 0.2mm falls at your location — not how long it rains. For Scottsdale we combine the hourly probability curve, expected volume in millimetres, and the city's own rainfall record into a single umbrella verdict.
| Factor | Weight | What it measures |
|---|---|---|
| Hourly probability | 40% | Peak and sustained chance of measurable rain across the next 24 hours. |
| Expected volume | 30% | Total millimetres, which separates a passing shower from a genuine soaking. |
| Timing & duration | 20% | When rain starts, when it eases, and the longest continuous dry window. |
| Local rain type | 10% | Drizzle, brief showers, thunderstorms or monsoon — each needs different gear. |
Live hourly values come from Open-Meteo and refresh through the day. Monthly rainfall figures are climate normals, so they describe a typical year rather than a forecast.
Scottsdale records rain on roughly 28 days a year — about a 8% chance on any given day — totalling around 193mm.
August, with about 22mm over 4 rain days. That is 11% of the entire year's rainfall in a single month.
June is the driest month at 1mm across roughly 1 days. October through May offers dry, comfortable to hot conditions.
Scottsdale is desert-dry most of the year. Summer monsoon storms are spectacular but brief — the desert comes alive after rare rain.
No. Probability is the chance that at least 0.2mm of rain falls at your location at some point in the period. Check the expected millimetres alongside it: 40% with 0.4mm is a passing shower, 40% with 12mm is a soaking.