Sierra Vista, Arizona Weather
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Climate of Sierra Vista: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), June is usually the hottest month in Sierra Vista, with average daytime highs around 35°C. January is the coolest, when nights typically fall to about -1°C and frost is possible on the coldest nights. That is a wide yearly range of roughly 36°C, so the seasons feel very different from each other.
The area receives about 390 mm of rain in a typical year. Most of it falls from July, and July is the wettest month at roughly 109 mm. The driest stretch is March to June and October to November, with under 20 mm a month.
For outdoor plans and travel, April to May and August to October usually offer the most comfortable weather in Sierra Vista, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | 14° | -1° | 25 mm | 52% |
| Feb | 16° | 1° | 20 mm | 48% |
| Mar | 20° | 4° | 17 mm | 40% |
| Apr | 25° | 7° | 6 mm | 31% |
| May | 30° | 12° | 4 mm | 24% |
| Jun | 35° | 18° | 14 mm | 22% |
| Jul | 32° | 20° | 109 mm | 48% |
| Aug | 31° | 19° | 87 mm | 54% |
| Sep | 30° | 16° | 50 mm | 51% |
| Oct | 25° | 10° | 15 mm | 45% |
| Nov | 19° | 4° | 18 mm | 46% |
| Dec | 14° | -1° | 23 mm | 52% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Sierra Vista. Values describe typical conditions, not a forecast.
About Sierra Vista weather
Sierra Vista lies in Arizona's mostly desert climate, with cooler high country in the north — about 98 km south-east of Tucson. Expect extremely hot summers (May–September) with highs regularly above 40°C in the low deserts. Winter brings mild, dry winters in the desert, cold with snow in the northern highlands. This page shows live, auto-refreshing weather for Sierra Vista: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/Phoenix.
Frequently asked questions
Sierra Vista is about 98 km south-east of Tucson, in Arizona.
Sierra Vista sees mild, dry winters in the desert, cold with snow in the northern highlands.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Sierra Vista's exact coordinates. No fixed schedule, the page updates whenever you load it.
June is usually the hottest month in Sierra Vista, with average daytime highs of about 35°C and nights around 18°C.
The coldest nights come in January, when the average low is about -1°C and daytime highs reach around 14°C. Frost is possible on clear, calm nights.
Sierra Vista receives about 390 mm of rain in a typical year. July is the wettest month at roughly 109 mm, the only month that averages more than 100 mm.
April to May and August to October usually offer the most comfortable weather in Sierra Vista, with mild daytime temperatures and little rain.
In November Sierra Vista typically sees daytime highs near 19°C and lows near 4°C, with about 18 mm of rain over the month and average humidity around 46%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
The current temperature for Sierra Vista updates automatically at the top of this page — scroll to the hourly strip below to see how it's expected to change over the day.
Sierra Vista's day-to-day weather follows the broader pattern of Arizona described above. See the hourly weather forecast or the air quality index for more detail.