McKinney, Texas Weather
Fireflies pulse through the magnolias. Day 77 of spring. Read this microseason across nine climate regions →
McKinney weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast10%—83°72°—
- FridayJun 5Overcast22%—88°72°+5°
- SaturdayJun 6Drizzle64%0.08″85°72°-3°
- SundayJun 7Light Showers48%—90°72°+5°
- MondayJun 8Overcast——93°74°+3°
- TuesdayJun 9Clear——95°75°+2°
- WednesdayJun 10Clear——96°75°+1°
Ozone at AQI 500. AQI flat over the last 6 hours (within ±3 points). Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
AVOID OUTDOORS Avoid outdoor exertion. Keep windows closed; use HEPA filtration indoors if available.
What's driving it
Ozone × UV × Sky
Ozone at AQI 500. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
- Present
- AQI 500
- UV peak
- 5.5 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 185
PM × Wind × Precip
PM2.5 at 8.7 µg/m³, PM10 at 9.8 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.89
- 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
- 4:36 AM
- Moonset
- 2:49 PM
- In sign
- ♒︎ Aquarius
Fireflies pulse through the magnolias
McKinney at a glance
- Today vs. normal: 84°F — typical for the season
- Last frost: March 6 (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 — McKinney
SPC has placed McKinney 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 | — | — |
| 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
July brings McKinney's warmest temperatures (~85°F mean) while January delivers the coldest (~46°F). October sees peak rainfall at 5.3 inches, while July receives the least at 2.2 inches.
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 46° | 2.8″ | 5 |
| February | 50° | 3.4″ | 5 |
| March | 58° | 3.6″ | 6 |
| April | 65° | 3.5″ | 5 |
| May | 73° | 5.2″ | 7 |
| June | 81° | 3.8″ | 5 |
| July | 85° | 2.2″ | 4 |
| August | 85° | 2.5″ | 4 |
| September | 77° | 3.3″ | 4 |
| October | 67° | 5.3″ | 6 |
| November | 56° | 3.0″ | 4 |
| December | 48° | 3.4″ | 4 |
Regional context
McKinney belongs to the humid subtropical climate region, sharing similar temperature ranges, seasonal patterns, and growing conditions with nearby cities.
Similar climates: Houston, TX, Dallas, TX, San Antonio, TX, Austin, TX, Fort Worth, TX.
Naturalist notes
Late April brings the return of Mississippi Kites to McKinney, their sleek forms cutting through warming air as they hunt insects above the tree canopy.
Texas Redbud trees burst into magenta bloom throughout March, their heart-shaped leaves emerging after the flowers fade.
Frequently asked
- When does it freeze in McKinney?
- McKinney's last spring frost typically falls around mid-March, and the first fall frost arrives around mid-December.
- What is the rainy season in McKinney?
- October is the wettest month with about 5.3 inches of rain on average; the city receives roughly 42 inches annually.
- What is the warmest month in McKinney?
- July is typically warmest, averaging about 85°F.
- What is the coldest month in McKinney?
- January is typically coldest, averaging about 46°F.
- When can I start a vegetable garden in McKinney?
- 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 McKinney get?
- McKinney averages about 57 rainy days per year.
- What hardiness zone is McKinney?
- McKinney'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
McKinney, Texas sits in a humid subtropical climate zone. January temperatures hover near 46°F while July averages 85°F — a 39°F seasonal swing.
Throughout the year, McKinney receives about 42 inches of precipitation spread over roughly 57 rainy days.
Geography shapes McKinney's weather patterns through its latitude (33.2°N), proximity to large water bodies, and elevation. These factors determine what grows here, when frost arrives, and the daily weather patterns residents experience.