Basilemorin / CC0
Allen, TX Weather on May 15
May 15th in Allen, TX typically brings warm spring weather, with average highs around 82°F and lows near 60°F. Over 55 years of records, the warmest May 15th was in 1990 (81°F average), while the coldest was 2011 (59°F) — a 22°F range across recorded history. Rain or other precipitation has occurred on about 27% of May 15th dates historically, with the wettest May 15th recording 3.86" of rain. The last decade has been 2.6°F warmer on this date compared to 20-30 years ago.
What to Expect on May 15
Planning for May 15th in Allen, TX? Stay hydrated and seek shade during peak afternoon hours.
May 15 Weather Records for Allen
- •The all-time record high for May 15th in Allen, TX is 93°F, set in 1978.
- •The coldest May 15th on record dropped to 45°F in 1971.
- •Temperatures have reached 90°F or higher on May 15th in 3 of the last 55 years.
Frequently Asked Questions
What was the warmest May 15 ever in Allen?
The warmest May 15 in Allen, TX reached 93°F in 1978. That is 11°F above the long-term average high of 82°F.
What was the coldest May 15 ever in Allen?
The coldest May 15 in Allen, TX dropped to 45°F in 1971. That is 15°F below the long-term average low of 60°F.
What is the average temperature on May 15 in Allen?
On May 15, Allen averages a high of 82°F and a low of 60°F based on 55 years of NOAA weather observations from MCKINNEY MUNI AP.
How many years of weather data are available for May 15 in Allen?
We have 55 years of weather records for May 15 in Allen, TX, sourced from NOAA's Global Historical Climatology Network. Records include daily high and low temperatures, precipitation, and snowfall data going back to 2025.
May 15 Weather History in Allen
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 88°F | 70°F | 0" | -- |
| 2024 | 87°F | 59°F | 0" | -- |
| 2023 | 85°F | 66°F | 0.03" | -- |
| 2022 | 92°F | 64°F | 0.69" | -- |
| 2021 | 82°F | 59°F | 0" | -- |
| 2020 | 85°F | 65°F | 0.13" | -- |
| 2019 | 86°F | 59°F | 0" | -- |
| 2018 | 87°F | 67°F | 0.1" | -- |
| 2017 | 86°F | 64°F | 0" | -- |
| 2016 | 71°F | 55°F | 0" | -- |
| 2015 | 76°F | 69°F | 0.36" | -- |
| 2014 | 81°F | 46°F | 0" | -- |
| 2013 | 79°F | 63°F | 1.55" | -- |
| 2012 | 84°F | 60°F | 0" | -- |
| 2011 | 71°F | 47°F | 0" | -- |
| 2010 | 79°F | 63°F | 0" | -- |
| 2009 | 86°F | 68°F | 0" | -- |
| 2008 | 70°F | 56°F | 0" | -- |
| 2007 | 89°F | 65°F | 0" | -- |
| 2006 | 76°F | 51°F | 0" | -- |
| 2005 | 78°F | 52°F | 0" | -- |
| 2004 | 75°F | 55°F | 0" | -- |
| 2003 | 82°F | 65°F | 0" | -- |
| 2002 | 79°F | 56°F | 0" | -- |
| 2001 | 88°F | 65°F | 0" | -- |
| 2000 | 83°F | 52°F | 0" | -- |
| 1999 | 84°F | 60°F | 0" | -- |
| 1998 | 86°F | 75°F | 0" | -- |
| 1997 | 76°F | 60°F | 0" | -- |
| 1996 | 88°F | 71°F | 0" | -- |
| 1995 | 89°F | -- | 0" | -- |
| 1994 | 84°F | 64°F | 0.66" | -- |
| 1993 | 89°F | 56°F | 0" | -- |
| 1992 | 86°F | 64°F | 1.5" | -- |
| 1991 | 82°F | 51°F | 1.04" | -- |
| 1990 | 89°F | 73°F | 0.08" | -- |
| 1989 | 84°F | 65°F | 0" | -- |
| 1988 | 88°F | 60°F | 0" | -- |
| 1987 | 82°F | 62°F | 1.68" | -- |
| 1986 | 83°F | 68°F | 0" | -- |
| 1985 | 84°F | 52°F | 0" | -- |
| 1984 | 91°F | 67°F | 0" | -- |
| 1983 | 69°F | 52°F | 1.65" | -- |
| 1982 | 83°F | 64°F | 0" | -- |
| 1981 | 73°F | 50°F | 0" | -- |
| 1980 | 75°F | 60°F | 1.09" | -- |
| 1979 | 84°F | 55°F | 0" | -- |
| 1978 | 93°F | 60°F | 0" | -- |
| 1977 | 84°F | 68°F | 0" | -- |
| 1976 | 76°F | 51°F | 0" | -- |
| 1975 | 78°F | 62°F | 3.86" | -- |
| 1974 | 89°F | 70°F | 3.38" | -- |
| 1973 | 74°F | 49°F | 0" | -- |
| 1972 | 85°F | 52°F | 0" | -- |
| 1971 | 81°F | 45°F | 0" | -- |
Based on 55 years of data from NOAA station: MCKINNEY MUNI AP
Monthly Climate Averages
Historical temperature and precipitation averages for Allen, TX, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.