McKinney, Texas Weather
Thunder quiets the land. Day 93 of summer. Read this microseason across nine climate regions →
McKinney weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 6:36 AM CDT · Open-Meteo
- TodaySep 21Clear——94°72°—
- TuesdaySep 22Overcast——91°73°-3°
- WednesdaySep 23Overcast——96°75°+5°
- ThursdaySep 24Overcast——96°71°0°
- FridaySep 25Overcast——95°70°-1°
- SaturdaySep 26Overcast——95°72°0°
- SundaySep 27Light Drizzle11%—101°79°+6°
Air quality now AQI 55 · Moderate
AQI 55 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 5.7 µg/m³ (AQI 32) with a 0.83 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in stagnant air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 5.7 µg/m³ (AQI 32) with a 0.83 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in stagnant air, not road dust.
- PM2.5/PM10
- 0.83
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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).
September dries up ditches or breaks down bridges.
- Moonrise
- 4:42 PM
- Moonset
- 2:09 AM
- In sign
- ♑︎ Capricorn
Thunder quiets the land
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
McKinney at a glance
- Today vs. normal: Today averages 83°F (high 94°F, low 72°F), 8°F above the 75°F normal for Sep 21
- Last frost: March 17 (1991–2020 median, NOAA station 7 km away)
- Microseason: Sep 21–25
- Planting calendar: September — harvest beans, summer squash, winter squash
16-Day Forecast — McKinney
- Mon94°72°8%
- Tue91°73°6%
- Wed96°75°6%
- Thu96°71°1%
- Fri95°70°1%
- Sat95°72°5%
- Sun101°79°11%
- Mon101°76°22%
- Tue86°72°31%
- Wed92°69°18%
- Thu92°71°14%
- Fri92°72°10%
- Sat87°70°14%
- Sun81°63°22%
- Mon76°53°26%
- Tue79°53°17%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near McKinney
Interactive wind and temperature map centered on McKinney — it loads in your browser. Open the full weather map.
Right now in the garden
Late season
As of September 21, the first frost (around November 15) is about 8 weeks away. Frost-tender plants keep producing until then. This city's planting calendar for September: harvest beans, summer squash, and winter squash.
SPC Convective Outlook
Storm Prediction Center — McKinney
SPC includes McKinney in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3NONENo severe risk
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook.
Sun & seasons in McKinney
McKinney sits in Collin County, where the year’s longest day runs 14h 21m of daylight and its shortest just 9h 57m — a swing of +4h 24m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.
Houston, the state’s largest city, lies about 248 miles to the SSE. The nearest town McKinney tracks is Frisco, roughly 9 miles to the WSW.
Air quality in McKinney
Air quality in McKinney’s county has trended dirtier since 2020; its cleanest year on record was 2020 (median AQI 37). See the full air-quality history for McKinney.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| February | lettuce, peas, spinach, radishes | — |
| March | lettuce, peas, spinach, radishes | radishes |
| April | tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes |
| May | tomatoes, squash | lettuce, peas, spinach, radishes, beans, summer squash |
| June | squash | tomatoes, peppers, beans, summer squash, garlic |
| July | tomatoes, peppers, beans, squash | tomatoes, peppers, summer squash, winter squash |
| August | tomatoes, peppers, beans, squash, fall brassicas, carrots | summer squash, winter squash |
| September | — | beans, summer squash, winter squash |
| October | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash |
| November | — | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
| December | — | fall brassicas, carrots |
A year in weather
McKinney peaks at about 85°F in July and bottoms near 46°F in January; October brings the heaviest rain (5.3 inches) and July the least (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
Similar climates Fairview, TX, New Hope, TX, Allen, TX
McKinney swings from 46°F in January to 85°F in July (39°F) per NOAA NCEI 1991-2020 normals; precipitation in McKinney runs about 41.9 inches on roughly 57 measurable days.
Rainfall in McKinney splits evenly between the seasons: October tops out at 5.3 inches over 5.6 rainy days, and July logs 2.2 inches across 3.5 — neither half of McKinney's year dominates. It is a balanced pattern McKinney shares with places like Fairview, TX, New Hope, TX and Allen, TX.
Once McKinney passes March 17, freezes fade and McKinney's beds take lettuce, chard, arugula, and mustard greens. Tomatoes and peppers do best set out two weeks later in McKinney, once nights clear the mid-40s°F. By November 15, frost is back in McKinney — protect or harvest anything tender. That date is a median: McKinney freezes sooner in half of years.
Similar climates: Fairview, TX, New Hope, TX, Allen, TX, Lowry Crossing, TX, Prosper, TX.
Frequently asked
- When does it freeze in McKinney?
- McKinney's last spring frost lands near March 17, and in McKinney the first fall frost follows around November 15.
- What is the rainy season in McKinney?
- McKinney sees its heaviest rain in October (around 5.3 inches), part of roughly 42 inches a year.
- What is the warmest month in McKinney?
- The warmest stretch in McKinney comes in July, around 85°F on average.
- What is the coldest month in McKinney?
- On average January is the chilliest month in McKinney, about 46°F.
- When can I start a vegetable garden in McKinney?
- McKinney's last frost (March 17) cues hardy greens; in McKinney, hold heat-lovers two weeks past.
- How many rainy days does McKinney get?
- Expect roughly 57 wet days a year in McKinney.
- What hardiness zone is McKinney?
- McKinney sits in the USDA zone set by January lows near 46°F; the USDA ZIP tool gives the band.
- What is the 10-day forecast for McKinney?
- McKinney's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
- Will it rain this week in McKinney?
- See this week's day-by-day rain chances for McKinney in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in McKinney?
- Current conditions for McKinney and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the McKinney forecast updated?
- The McKinney forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in McKinney?
- Today's sunrise and sunset times for McKinney are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
- How accurate is the weather forecast for McKinney?
- The next few days in McKinney's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
McKinney sits at 33.2°N; its climate zone is humid subtropical (Köppen approximation).
ZIP codes in McKinney
- 75069
- 75070
- 75071
- 75072