Fountain Hills, Arizona Weather
Heat hardens the dust. Day 77 of spring. Read this microseason across nine climate regions →
Fountain Hills weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Clear——103°74°—
- ThursdayJun 4Clear——105°78°+2°
- FridayJun 5Clear——103°76°-2°
- SaturdayJun 6Overcast——101°75°-2°
- SundayJun 7Overcast——101°75°0°
- MondayJun 8Overcast——101°73°0°
- TuesdayJun 9Overcast——101°78°0°
Ozone at AQI 66 now. AQI up 22 in the last 6 hours — air quality is degrading. With UV 0.1 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 16 by mid-afternoon.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 66 now. With UV 0.1 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 16 by mid-afternoon.
- Present
- AQI 66
- UV peak
- 0.1 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 16
PM × Wind × Precip
PM2.5 at 7.0 µg/m³, PM10 at 39.6 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.18
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- background
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 5:39 AM
- Moonset
- 3:51 PM
- In sign
- ♑︎ Capricorn
Heat hardens the dust
Fountain Hills at a glance
- Today vs. normal: 15°F above the seasonal normal for this latitude
- Last frost: March 9 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 4, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | lettuce, peas, spinach, radishes | — |
| April | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | — |
| May | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | — | tomatoes, beans, summer squash |
| August | — | tomatoes, beans, summer squash |
| September | — | tomatoes, beans, summer squash |
| October | fall brassicas, garlic (overwinter), carrots | winter squash, tomatoes (last) |
| November | fall brassicas, garlic (overwinter), carrots | — |
| December | — | — |
A year in weather
Fountain Hills's warmest month is July (~92°F mean) and its coldest is December (~53°F). Rainfall peaks in February (1.5 inches) and bottoms out in June (0.1 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 54° | 1.4″ | 2 |
| February | 56° | 1.5″ | 3 |
| March | 62° | 1.3″ | 1 |
| April | 69° | 0.4″ | 1 |
| May | 78° | 0.2″ | 1 |
| June | 87° | 0.1″ | 0 |
| July | 92° | 1.2″ | 2 |
| August | 92° | 1.3″ | 3 |
| September | 86° | 1.1″ | 2 |
| October | 74° | 0.6″ | 1 |
| November | 62° | 0.8″ | 1 |
| December | 53° | 1.1″ | 3 |
Regional context
Fountain Hills sits within a hot desert climate region — a cohort that shares similar temperature ranges, seasonal patterns, and growing conditions across nearby cities.
Similar climates: Phoenix, AZ, Tucson, AZ, Mesa, AZ, Gilbert, AZ, Chandler, AZ.
Frequently asked
- When does it freeze in Fountain Hills?
- Fountain Hills's last spring frost typically falls around mid-March, and the first fall frost arrives around mid-December.
- What is the rainy season in Fountain Hills?
- February is the wettest month with about 1.5 inches of rain on average; the city receives roughly 11 inches annually.
- What is the warmest month in Fountain Hills?
- July is typically warmest, averaging about 92°F.
- What is the coldest month in Fountain Hills?
- December is typically coldest, averaging about 53°F.
- When can I start a vegetable garden in Fountain Hills?
- Cool-season crops (peas, lettuce) can be sown around the last spring frost (mid-March); warm-season crops (tomatoes, peppers) wait until 1–2 weeks after.
- How many rainy days does Fountain Hills get?
- Fountain Hills averages about 20 rainy days per year.
- What hardiness zone is Fountain Hills?
- Fountain Hills's USDA hardiness zone is determined by its lowest average winter temperature; check the USDA's online lookup with the city ZIP for the current zone designation.
Climate
Fountain Hills, Arizona sits in a hot desert climate zone. January means hover near 54°F while July averages 92°F — a 38°F seasonal swing.
Across the year, Fountain Hills receives about 11 inches of precipitation spread over roughly 20 rainy days.
The rhythm of the year is set by latitude (33.6°N), proximity to large water bodies, and elevation — all of which shape what grows here, when frost is likely, and what the weather story looks like day to day.