Plano, TX Weather
Plano hourly forecast: next 24 hours
Today's high of 100°F (38°C) is about 12°F (7°C) above the typical September high of 88°F (31°C).
Current conditions in detail
Plano weather tomorrow (Wednesday, September 16)
Tomorrow in Plano looks sunny, with a high of 98° and an overnight low of 83°. Precipitation chance is modest at 36%. Winds top out near 14 mph, and the UV index reaches 8 (high).
Plano 14-day forecast
About the weather in Plano
Plano runs one of the wider annual swings in our dataset: 22°C separates the average July from the average January. Afternoons reach 94°F (34°C) at the peak of summer and 55°F (13°C) at the depth of winter, with 113 days of measurable precipitation through the year.
Plano weather: quick facts
- Hottest month: July - highs near 94°F (34°C)
- Coldest month: January - highs near 55°F (13°C)
- Decade extremes (2015-2024): 109°F (43°C) high · -6°F (-21°C) low
- Wettest month: May (15 rainy days) · Sunniest: July (12.1 h sun/day)
- Climate type: humid subtropical
- Annual swing: 22°C between the average warmest and coolest month · day to night: 10°C
- Snow: about 1 days a year
- Months averaging 30°C or hotter: 4
- Average humidity: 67%
Temperatures through the year
Average highs hold at or above 30°C for 4 months of the year, June through September being the unbroken run. January sits at the other end of the year: 55°F (13°C) by day, 37°F (3°C) at night. At its warmest, in July, Plano runs to 94°F (34°C) in the afternoon and back to 77°F (25°C) by dawn. Relative humidity averages 67% across the year, drier than about 75% of the cities we track.
Rain, sun and snow
Snowfall is rare but not unheard of. Precipitation concentrates in May - 8.3 inches (211 mm) on 15 days - and thins out by July. July is the brightest month at 12.1 hours of sun a day, against an annual average of 9.2. The gridded 2015-2024 daily record for this location tops out at 109°F (43°C) and bottoms at -6°F (-21°C) - decade extremes, not all-time station records.
Season by season
Spring (March through May)
Through spring, Plano is pleasantly warm: 74°F (24°C) by day, 57°F (14°C) after dark, and rain falls on around 36 of the 90 days.
Summer (June through August)
Summer in Plano brings serious heat, with daytime highs averaging 92°F (33°C) and nights around 75°F (24°C); expect showers on roughly 28 days across the season. Daylight is generous - around 11.7 hours of sun a day.
Fall (September through November)
Through fall, Plano settles into easy warmth: 77°F (25°C) by day, 60°F (15°C) after dark, and expect showers on roughly 24 days across the season.
Winter (December through February)
Winter in Plano is mild, with daytime highs averaging 58°F (14°C) and nights around 40°F (4°C); expect showers on roughly 24 days across the season.
Average temperatures in Plano by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 55° | 37° | 7 | 2.8 in | 7.3 h/day | 66% |
| February | 59° | 40° | 9 | 4.1 in | 7.1 h/day | 69% |
| March | 68° | 50° | 11 | 4.9 in | 8.0 h/day | 68% |
| April | 74° | 55° | 11 | 6.7 in | 9.1 h/day | 68% |
| May | 82° | 65° | 15 | 8.3 in | 9.4 h/day | 74% |
| June | 89° | 72° | 10 | 4.9 in | 11.4 h/day | 70% |
| July | 94° | 77° | 9 | 2.5 in | 12.1 h/day | 62% |
| August | 93° | 77° | 9 | 4.5 in | 11.7 h/day | 61% |
| September | 88° | 71° | 9 | 4.3 in | 10.3 h/day | 64% |
| October | 78° | 60° | 8 | 6.3 in | 9.1 h/day | 62% |
| November | 66° | 49° | 8 | 3.9 in | 7.5 h/day | 70% |
| December | 59° | 42° | 8 | 3.8 in | 6.9 h/day | 70% |