Thornton Weather in May
Average highs run from 80°F on May 1 to 87°F on May 31, and lows from 56°F to 65°F. Normal precipitation for the month is 4.97 in over about 8 wet days.
May day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
May at a glance
- Average high
- 83°F
- Average low
- 61°F
- Precipitation
- 4.97 in
- Record high
- 99°FMay 29, 1996
- Record low
- 39°FMay 1, 2005
- Chance of a freeze
- 0%
- Days of 90°F or more
- 4.9
- Daylight
- 13 h 25 min to 14 h 03 min
- Cloud cover
- 58%
- Humidity
- 75%
- Dew point
- 65°F
- Wind
- 9.6 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| May 1 | 80°F | 56°F | 90°F 2002 | 39°F 2005 | 23% | 0% |
| May 2 | 80°F | 57°F | 90°F 1987 | 45°F 2004 | 23% | 0% |
| May 3 | 80°F | 57°F | 89°F 1975 | 46°F 1973 | 23% | 0% |
| May 4 | 81°F | 57°F | 96°F 1984 | 43°F 1978 | 24% | 0% |
| May 5 | 81°F | 58°F | 97°F 1984 | 48°F 1990 | 24% | 0% |
| May 6 | 81°F | 58°F | 96°F 1984 | 45°F 1991 | 24% | 0% |
| May 7 | 81°F | 58°F | 94°F 1998 | 47°F 1999 | 24% | 0% |
| May 8 | 81°F | 59°F | 92°F 1998 | 52°F 1984 | 24% | 0% |
| May 9 | 82°F | 59°F | 92°F 1988 | 42°F 1984 | 24% | 0% |
| May 10 | 82°F | 59°F | 91°F 1984 | 49°F 1984 | 24% | 0% |
| May 11 | 82°F | 60°F | 93°F 1984 | 47°F 1997 | 24% | 0% |
| May 12 | 82°F | 60°F | 95°F 1984 | 47°F 1979 | 24% | 0% |
| May 13 | 83°F | 60°F | 96°F 1984 | 44°F 1997 | 24% | 0% |
| May 14 | 83°F | 60°F | 97°F 1984 | 47°F 1971 | 24% | 0% |
| May 15 | 83°F | 61°F | 92°F 1966 | 49°F 1967 | 24% | 0% |
| May 16 | 83°F | 61°F | 91°F 1978 | 46°F 1983 | 24% | 0% |
| May 17 | 84°F | 61°F | 93°F 1988 | 49°F 1970 | 24% | 0% |
| May 18 | 84°F | 62°F | 93°F 1987 | 50°F 1976 | 23% | 0% |
| May 19 | 84°F | 62°F | 91°F 1988 | 45°F 2002 | 23% | 0% |
| May 20 | 84°F | 62°F | 92°F 1996 | 48°F 2002 | 23% | 0% |
| May 21 | 85°F | 63°F | 95°F 2005 | 50°F 1988 | 23% | 0% |
| May 22 | 85°F | 63°F | 95°F 2005 | 43°F 2001 | 23% | 0% |
| May 23 | 85°F | 63°F | 96°F 1996 | 51°F 1963 | 23% | 0% |
| May 24 | 85°F | 64°F | 94°F 1996 | 56°F 1967 | 23% | 0% |
| May 25 | 86°F | 64°F | 94°F 1989 | 52°F 1979 | 23% | 0% |
| May 26 | 86°F | 64°F | 95°F 1996 | 56°F 1979 | 23% | 0% |
| May 27 | 86°F | 64°F | 94°F 1984 | 49°F 1988 | 23% | 0% |
| May 28 | 87°F | 65°F | 96°F 1996 | 52°F 2003 | 22% | 0% |
| May 29 | 87°F | 65°F | 99°F 1996 | 56°F 1984 | 22% | 0% |
| May 30 | 87°F | 65°F | 98°F 1998 | 45°F 1984 | 22% | 0% |
| May 31 | 87°F | 65°F | 99°F 1998 | 48°F 1984 | 22% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CDT).
- May 1
- sunrise 6:41 AM, sunset 8:06 PM
- May 31
- sunrise 6:23 AM, sunset 8:26 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00415611 (Marlin), public domain. Records: NOAA GHCN-Daily, station USC00413047, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.