McHenry County Weather in October
Average highs run from 65°F on October 1 to 47°F on October 31, and lows from 36°F to 22°F. Normal precipitation for the month is 1.20 in over about 3 wet days.
October day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
October at a glance
- Average high
- 57°F
- Average low
- 29°F
- Precipitation
- 1.20 in
- Snowfall
- 2.2 in
- Record high
- 94°FOct 4, 1963
- Record low
- 0°FOct 31, 1991
- Chance of a freeze
- 100%
- Daylight
- 11 h 39 min to 9 h 58 min
- Cloud cover
- 65%
- Humidity
- 67%
- Dew point
- 32°F
- Wind
- 12.1 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 |
|---|---|---|---|---|---|---|
| Oct 1 | 65°F | 36°F | 92°F 1953 | 16°F 1974 | 12% | 1% |
| Oct 2 | 65°F | 36°F | 92°F 1997 | 20°F 1999 | 12% | 1% |
| Oct 3 | 64°F | 35°F | 86°F 2025 | 19°F 1989 | 12% | 2% |
| Oct 4 | 64°F | 35°F | 94°F 1963 | 22°F 2004 | 11% | 2% |
| Oct 5 | 63°F | 34°F | 91°F 2021 | 24°F 2000 | 11% | 2% |
| Oct 6 | 63°F | 34°F | 90°F 2021 | 17°F 1954 | 11% | 2% |
| Oct 7 | 62°F | 33°F | 85°F 2003 | 17°F 1976 | 11% | 2% |
| Oct 8 | 62°F | 33°F | 82°F 2024 | 18°F 1993 | 11% | 2% |
| Oct 9 | 61°F | 33°F | 86°F 2003 | 13°F 1985 | 11% | 2% |
| Oct 10 | 61°F | 32°F | 85°F 1955 | 15°F 1987 | 10% | 2% |
| Oct 11 | 60°F | 32°F | 81°F 1995 | 15°F 1959 | 10% | 2% |
| Oct 12 | 59°F | 31°F | 81°F 1956 | 18°F 1959 | 10% | 2% |
| Oct 13 | 59°F | 31°F | 85°F 1958 | 20°F 1979 | 10% | 3% |
| Oct 14 | 58°F | 30°F | 83°F 1988 | 18°F 2018 | 10% | 3% |
| Oct 15 | 58°F | 30°F | 83°F 1953 | 16°F 1966 | 10% | 3% |
| Oct 16 | 57°F | 29°F | 84°F 1961 | 13°F 1976 | 10% | 3% |
| Oct 17 | 56°F | 29°F | 79°F 1997 | 14°F 1948 | 10% | 3% |
| Oct 18 | 56°F | 28°F | 80°F 2000 | 9°F 1972 | 10% | 3% |
| Oct 19 | 55°F | 28°F | 84°F 2003 | 6°F 1960 | 9% | 3% |
| Oct 20 | 54°F | 28°F | 80°F 2017 | 21°F 1949 | 9% | 3% |
| Oct 21 | 54°F | 27°F | 80°F 2024 | 16°F 1997 | 9% | 4% |
| Oct 22 | 53°F | 27°F | 79°F 1963 | 17°F 1951 | 9% | 4% |
| Oct 23 | 53°F | 26°F | 78°F 1963 | 11°F 1981 | 9% | 4% |
| Oct 24 | 52°F | 26°F | 79°F 1948 | 10°F 1957 | 9% | 4% |
| Oct 25 | 51°F | 25°F | 75°F 1955 | 6°F 1957 | 9% | 4% |
| Oct 26 | 51°F | 25°F | 77°F 1955 | 9°F 1957 | 9% | 4% |
| Oct 27 | 50°F | 24°F | 76°F 1983 | 14°F 2023 | 9% | 4% |
| Oct 28 | 49°F | 24°F | 70°F 1985 | 10°F 1988 | 9% | 5% |
| Oct 29 | 49°F | 23°F | 75°F 1950 | 9°F 1991 | 9% | 5% |
| Oct 30 | 48°F | 23°F | 80°F 1950 | 1°F 1991 | 9% | 5% |
| Oct 31 | 47°F | 22°F | 76°F 1999 | 0°F 1991 | 9% | 5% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CDT).
- October 1
- sunrise 7:42 AM, sunset 7:21 PM
- October 31
- sunrise 8:27 AM, sunset 6:25 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00328792 (Towner 2 Ne), public domain. Records: NOAA GHCN-Daily, station USW00024013, 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.