Castle Hills, Texas Weather
Fireflies pulse through the magnolias. Day 77 of spring. Read this microseason across nine climate regions →
Castle Hills weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Drizzle24%0.08″88°72°—
- FridayJun 5Overcast62%—86°73°-2°
- SaturdayJun 6Light Drizzle62%—88°72°+2°
- SundayJun 7Drizzle34%—91°74°+3°
- MondayJun 8Light Drizzle16%—92°74°+1°
- TuesdayJun 9Overcast10%—93°73°+1°
- WednesdayJun 10Overcast10%—94°73°+1°
AQI 27 (Good), driven by Ozone. AQI down 7 over the last 6 hours (steady decline since this morning).
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
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
- 4:35 AM
- Moonset
- 3:05 PM
- In sign
- ♑︎ Capricorn
Fireflies pulse through the magnolias
Castle Hills at a glance
- Today vs. normal: 13°F below the seasonal normal for this latitude
- Last frost: February 12 (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.
SPC Convective Outlook
Storm Prediction Center — Castle Hills
SPC has placed Castle Hills in the General Thunderstorms category for severe thunderstorms today.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | lettuce, peas, spinach, radishes | — |
| March | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | — |
| April | tomatoes, peppers, beans, squash | — |
| May | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| June | — | 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
Castle Hills's warmest month is August (~85°F mean) and its coldest is January (~52°F). Rainfall peaks in May (4.4 inches) and bottoms out in February (1.9 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 52° | 2.2″ | 4 |
| February | 56° | 1.9″ | 3 |
| March | 62° | 2.4″ | 4 |
| April | 69° | 2.3″ | 3 |
| May | 76° | 4.4″ | 4 |
| June | 82° | 3.5″ | 4 |
| July | 84° | 2.4″ | 4 |
| August | 85° | 2.4″ | 3 |
| September | 79° | 3.9″ | 5 |
| October | 71° | 3.9″ | 5 |
| November | 60° | 2.5″ | 3 |
| December | 53° | 2.1″ | 4 |
Regional context
Castle Hills sits within a humid subtropical climate region — a cohort that shares similar temperature ranges, seasonal patterns, and growing conditions across nearby cities.
Similar climates: Houston, TX, Dallas, TX, San Antonio, TX, Austin, TX, Fort Worth, TX.
Frequently asked
- When does it freeze in Castle Hills?
- Castle Hills's last spring frost typically falls around mid-February, and the first fall frost arrives around mid-December.
- What is the rainy season in Castle Hills?
- May is the wettest month with about 4.4 inches of rain on average; the city receives roughly 34 inches annually.
- What is the warmest month in Castle Hills?
- August is typically warmest, averaging about 85°F.
- What is the coldest month in Castle Hills?
- January is typically coldest, averaging about 52°F.
- When can I start a vegetable garden in Castle Hills?
- Cool-season crops (peas, lettuce) can be sown around the last spring frost (mid-February); warm-season crops (tomatoes, peppers) wait until 1–2 weeks after.
- How many rainy days does Castle Hills get?
- Castle Hills averages about 47 rainy days per year.
- What hardiness zone is Castle Hills?
- Castle 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
Castle Hills, Texas sits in a humid subtropical climate zone. January means hover near 52°F while July averages 84°F — a 32°F seasonal swing.
Across the year, Castle Hills receives about 34 inches of precipitation spread over roughly 47 rainy days.
The rhythm of the year is set by latitude (29.5°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.