Ontario Weather in October
Average highs run from 86°F on October 1 to 80°F on October 31, and lows from 61°F to 53°F. Normal precipitation for the month is 0.41 in over about 2 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
- 83°F
- Average low
- 57°F
- Precipitation
- 0.41 in
- Record high
- 107°FOct 1, 2012
- Record low
- 41°FOct 31, 2019
- Chance of a freeze
- 0%
- Days of 90°F or more
- 8.0
- Daylight
- 11 h 50 min to 10 h 49 min
- Cloud cover
- 24%
- Humidity
- 45%
- Dew point
- 38°F
- Wind
- 5.8 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Oct 1 | 86°F | 61°F | 107°F 2012 | 52°F 2019 | 4% |
| Oct 2 | 86°F | 61°F | 105°F 2020 | 52°F 2023 | 4% |
| Oct 3 | 86°F | 60°F | 101°F 2020 | 50°F 2002 | 4% |
| Oct 4 | 85°F | 60°F | 102°F 2014 | 51°F 2009 | 4% |
| Oct 5 | 85°F | 60°F | 100°F 2014 | 50°F 2009 | 4% |
| Oct 6 | 85°F | 60°F | 101°F 2023 | 48°F 2007 | 5% |
| Oct 7 | 85°F | 59°F | 99°F 2023 | 48°F 2011 | 5% |
| Oct 8 | 84°F | 59°F | 98°F 2008 | 50°F 2011 | 5% |
| Oct 9 | 84°F | 59°F | 103°F 2015 | 49°F 2013 | 5% |
| Oct 10 | 84°F | 59°F | 100°F 2015 | 48°F 2013 | 6% |
| Oct 11 | 84°F | 58°F | 98°F 2015 | 49°F 2008 | 6% |
| Oct 12 | 83°F | 58°F | 100°F 2011 | 48°F 2008 | 6% |
| Oct 13 | 83°F | 58°F | 100°F 1999 | 49°F 2000 | 6% |
| Oct 14 | 83°F | 58°F | 99°F 2020 | 48°F 2000 | 7% |
| Oct 15 | 83°F | 57°F | 100°F 2020 | 50°F 2000 | 7% |
| Oct 16 | 82°F | 57°F | 102°F 2020 | 51°F 1998 | 7% |
| Oct 17 | 82°F | 57°F | 101°F 2012 | 52°F 1998 | 7% |
| Oct 18 | 82°F | 57°F | 101°F 2023 | 44°F 1998 | 7% |
| Oct 19 | 82°F | 56°F | 98°F 2003 | 50°F 2021 | 8% |
| Oct 20 | 82°F | 56°F | 101°F 2003 | 49°F 2002 | 8% |
| Oct 21 | 81°F | 56°F | 101°F 2003 | 50°F 2004 | 8% |
| Oct 22 | 81°F | 56°F | 100°F 2003 | 50°F 2004 | 8% |
| Oct 23 | 81°F | 55°F | 104°F 2017 | 50°F 2004 | 8% |
| Oct 24 | 81°F | 55°F | 102°F 2017 | 50°F 2004 | 8% |
| Oct 25 | 81°F | 55°F | 99°F 2017 | 51°F 1998 | 9% |
| Oct 26 | 81°F | 55°F | 95°F 2017 | 47°F 1998 | 9% |
| Oct 27 | 80°F | 54°F | 96°F 2008 | 46°F 2011 | 9% |
| Oct 28 | 80°F | 54°F | 97°F 2008 | 47°F 2010 | 9% |
| Oct 29 | 80°F | 54°F | 95°F 2008 | 43°F 2009 | 9% |
| Oct 30 | 80°F | 54°F | 92°F 2025 | 44°F 2019 | 9% |
| Oct 31 | 80°F | 53°F | 91°F 1999 | 41°F 2019 | 9% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PDT).
- October 1
- sunrise 6:45 AM, sunset 6:35 PM
- October 31
- sunrise 7:09 AM, sunset 5:58 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00003102 (Ontario Intl AP), public domain. Records: NOAA GHCN-Daily, station USW00003102, 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.