Portland Downtown, OR
Oregon · Records since 1874–2026
Records for September 11
🔥 Record High
September 11, 2013
+19° from 76° normal❄ Record Low
September 11, 1889
-18° from 56° normalAll-Time Records — Portland Downtown
First & Last Dates — Portland Downtown
How early and how late each seasonal turning point has ever arrived, across the full period of record
Top 10 Record Highs — September 11
| # | Temp | Date |
|---|---|---|
| 🏆 | 95°F | September 11, 2013 |
| 2 | 93°F | September 11, 1922 |
| 3 | 93°F | September 11, 1886 |
| 4 | 92°F | September 11, 2015 |
| 5 | 92°F | September 11, 2011 |
| 6 | 91°F | September 11, 1957 |
| 7 | 90°F | September 11, 2008 |
| 8 | 90°F | September 11, 1975 |
| 9 | 90°F | September 11, 1892 |
| 10 | 89°F | September 11, 2017 |
Top 5 Record Lows — September 11
| # | Temp | Date |
|---|---|---|
| 🥶 | 38°F | September 11, 1889 |
| 2 | 43°F | September 11, 1906 |
| 3 | 44°F | September 11, 1879 |
| 4 | 44°F | September 11, 1875 |
| 5 | 45°F | September 11, 1936 |
Heat Wave Summary — Portland Downtown
threshold: 89°F (90th percentile of historical Jun–Aug highs)Days ≥ 90°F Per Year
1875–2026Average Daily High by Decade
Full year · complete decades only
Longest Heat Waves — Portland Downtown
| # | Dates | Days | Peak | Avg High | Avg Overnight Low |
|---|---|---|---|---|---|
| 🏆 | Jul 25, 2009 – Aug 3, 2009 | 10 | 105°F (Jul 28) | 96°F | 66°F |
| 2 | Aug 12, 1967 – Aug 20, 1967 | 9 | 98°F (Aug 15) | 94°F | 64°F |
| 3 | Jul 22, 2018 – Jul 30, 2018 | 9 | 97°F (Jul 29) | 92°F | 61°F |
| 4 | Jul 26, 1974 – Aug 3, 1974 | 9 | 96°F (Jul 31) | 92°F | 62°F |
| 5 | Aug 6, 1981 – Aug 12, 1981 | 7 | 106°F (Aug 10) | 101°F | 66°F |
| 6 | Aug 3, 1972 – Aug 9, 1972 | 7 | 102°F (Aug 7) | 94°F | 65°F |
| 7 | Jul 25, 2022 – Jul 31, 2022 | 7 | 101°F (Jul 26) | 97°F | 67°F |
| 8 | Jul 17, 1888 – Jul 23, 1888 | 7 | 97°F (Jul 17) | 94°F | 59°F |
| 9 | Jul 12, 1911 – Jul 18, 1911 | 7 | 97°F (Jul 13) | 94°F | 65°F |
| 10 | Jun 30, 2015 – Jul 6, 2015 | 7 | 95°F (Jul 2) | 94°F | 63°F |
Heat Waves Per Year
Warm Summer Nights (Jun–Aug)
Nights where the overnight low exceeded the 1991–2020 normal low
Above-Normal Summer Nights Per Year
Average June–August Low by Decade
Overnight lows · complete decades only
Precipitation
Annual totals and trend across the full period of record · see this year's standing →
Monthly Precipitation — Last 24 Months
Blue = actual · dashed line = monthly normal
Annual Precipitation Per Year (1872–2026)
Blue = above average · tan = below average · gold = 2026 (partial)
Since 1872, annual totals have trended
-0.15" per decade,
about -2.2"
across the record.
Heavy Rain Days Per Year (≥ 1.0")
Compare year-to-year changes in days with heavy rainfall (≥ 1.0")
This Year — 2026
How Portland Downtown is tracking against normal, year to date
Daily High Temperature vs Normal
132 of 249 days with data were above the 1991–2020 normal high for their date.
Precipitation, Year to Date
Accumulation vs. Normal
Running total since Jan 1 against the normal pace for the same date · Portland Downtown is 4.87" behind the normal pace
Period Review — Jun 12 – Sep 10, 2026
Any window, evaluated against every other year on record — 91 days
Average Temperature by Year — Jun 12 – Sep 10
1875–2026 · 2026 highlighted · trend +0.24° per decade (warming since 1875)
Precipitation by Year — Jun 12 – Sep 10
1872–2026 · 2026 highlighted · trend -0.05" per decade (drier since 1872)
Warmest Jun 12 – Sep 10 on Record
| # | Year | Avg Temp |
|---|---|---|
| 1 | 1967 | 71.6°F |
| 2 | 1958 | 71.0°F |
| 3 | 2021 | 70.9°F |
| 4 | 2015 | 70.7°F |
| 5 | 2022 | 70.6°F |
| 6 | 2017 | 70.1°F |
| 7 | 1961 | 70.0°F |
| 8 | 2023 | 69.8°F |
| 9 | 2018 | 69.8°F |
| 10 | 2004 | 69.6°F |
Coolest Jun 12 – Sep 10 on Record
| # | Year | Avg Temp |
|---|---|---|
| 1 | 1893 | 62.9°F |
| 2 | 1899 | 63.0°F |
| 3 | 1881 | 63.4°F |
| 4 | 1954 | 63.5°F |
| 5 | 1901 | 63.7°F |
| 6 | 1910 | 63.8°F |
| 7 | 1880 | 64.0°F |
| 8 | 1895 | 64.1°F |
| 9 | 1900 | 64.3°F |
| 10 | 1909 | 64.3°F |
Wettest Jun 12 – Sep 10 on Record
| # | Year | Total |
|---|---|---|
| 1 | 1912 | 7.48" |
| 2 | 1913 | 7.20" |
| 3 | 1983 | 6.63" |
| 4 | 1884 | 5.81" |
| 5 | 1937 | 5.78" |
| 6 | 1968 | 5.66" |
| 7 | 1977 | 5.41" |
| 8 | 1911 | 5.36" |
| 9 | 1916 | 5.32" |
| 10 | 1954 | 4.83" |
Driest Jun 12 – Sep 10 on Record
| # | Year | Total |
|---|---|---|
| 1 | 1883 | 0.33" |
| 2 | 2018 | 0.41" |
| 3 | 1951 | 0.60" |
| 4 | 2006 | 0.61" |
| 5 | 1944 | 0.65" |
| 6 | 1928 | 0.65" |
| 7 | 2017 | 0.66" |
| 8 | 1988 | 0.76" |
| 9 | 1910 | 0.79" |
| 10 | 1935 | 0.88" |