Hillsboro, OR All-Time Weather Extremes
The most extreme temperature, precipitation, and snowfall ever recorded in Hillsboro, from NOAA daily weather observations.
| Temperature | ||
|---|---|---|
| Record High | 113°F (45°C) | June 29, 2021 |
| Record Low | -4°F (-20°C) | December 8, 1972 |
| Lowest High | 14°F (-10°C) | February 4, 1989 |
| Highest Low | 75°F (24°C) | July 22, 2006 |
| Highest Mean | 91°F (33°C) | June 28, 2021 |
| Lowest Mean | 9.5°F (-12°C) | January 1, 1979 |
| Precipitation | ||
| Max in One Calendar Day | 4.23" (107.4 mm) | September 30, 2013 |
| Max in One Month | 20.82" (528.9 mm) | February 1999 |
| Least in One Month | 0.00" (0.0 mm) | August 2018 |
| Max in One Year | 77.28" (1962.8 mm) | 1999 |
| Least in One Year | 25.44" (646.1 mm) | 1985 |
| Snowfall | ||
| Max in One Calendar Day | 10.1" (25.7 cm) | December 21, 2008 |
| Max in One Month | 24.8" (63.1 cm) | December 2008 |
| Max in One Season | 27.4" (69.7 cm) | 1970-71 |
| Max in One Year | 29.0" (73.6 cm) | 1971 |
| Earliest Snow | 4.4" (11.2 cm) | October 28, 1996 |
| Earliest Measurable Snow | 4.4" (11.2 cm) | October 28, 1996 |
| Latest Snow | 0.3" (0.8 cm) | April 17, 1972 |
| Latest Measurable Snow | 0.3" (0.8 cm) | April 17, 1972 |
| Period of Record | ||
| Temperature | January 1, 1970 – June 30, 2026 | |
| Precipitation | January 1, 1970 – June 30, 2026 | |
| Snowfall | January 1, 1970 – August 31, 2025 | |
Note: Records compiled from NOAA GHCN-Daily observations at FOREST GROVE (7 mi from Hillsboro, OR). Quality-flagged readings are excluded. Monthly and annual totals require substantially complete reporting for “least” records.
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Frequently Asked Questions
What is the hottest temperature ever recorded in Hillsboro, OR?
The all-time record high in Hillsboro, OR is 113°F (45°C), set on June 29, 2021.
What is the coldest temperature ever recorded in Hillsboro, OR?
The all-time record low in Hillsboro, OR is -4°F (-20°C), set on December 8, 1972.
What is the most rain Hillsboro, OR has ever had in one day?
The most precipitation recorded in one calendar day near Hillsboro, OR is 4.23 inches, on September 30, 2013.
What is the biggest snowfall ever recorded in Hillsboro, OR?
The most snow recorded in one calendar day near Hillsboro, OR is 10.1 inches, on December 21, 2008.
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Hillsboro Weather History
Monthly averages, records, and climate data for Hillsboro
Oregon Weather Extremes
Statewide records and extremes for other Oregon cities