Portland Downtown, OR

Oregon · Records since 1874–2026

☁️ 62°F
Currently in Portland Downtown
As of 11:30 AM PDT

Records for September 11

🔥 Record High

95°F

September 11, 2013

+19° from 76° normal

❄ Record Low

38°F

September 11, 1889

-18° from 56° normal
🌞 Normal high: 76°F 🌑 Normal low: 56°F 1991–2020 normals

All-Time Records — Portland Downtown

🔥
114°F
Hottest Day Ever
Jun 28, 2021
❄
-2°F
Coldest Day Ever
Jan 15, 1888
🌧
6.68"
Wettest Day Ever
Dec 13, 1882
☃
15.5"
Most Snow in One Day
Jan 21, 1943

First & Last Dates — Portland Downtown

How early and how late each seasonal turning point has ever arrived, across the full period of record

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Range ever recorded Normal date (1991–2020)
332 days
Longest growing season
2016
190 days
Shortest growing season
1894
273 days
Normal growing season
1991–2020 average

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
About this data — Records are sourced from the NOAA Threadex dataset via RCC ACIS, a quality-controlled record for long-term climate stations. Threadex adjusts for station relocations and observation-time changes, making records comparable across all years since 1874–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Portland Downtown

threshold: 89°F (90th percentile of historical Jun–Aug highs)
3.9
Avg heat wave length
days (historical)
97°
Avg peak temp
during heat waves
1
Dangerous nights 2026
Overnights ≥ 70°F
2
Heat waves 2026
so far

Days ≥ 90°F Per Year

1875–2026
9
2026 so far
10
Avg/year 1970–2025
14
Avg/year (last 10 complete)
24
Most in a year (1967)

Average 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

40
2026 total
above-normal nights
35.6
Avg / summer
1970–2020
68
Most in a summer
1958

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

Above normal Below normal

132 of 249 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

20.09"
2026 YTD
Normal: 24.96"
-4.87"
0.84"
September so far
September normal: 1.58"
-0.74"
3
2026 heavy rain days
Days with ≥ 1.0"

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 — Sep 1 – Sep 10, 2026

Any window, evaluated against every other year on record — 10 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
63.5°F
Average temperature
45th-coolest of 151
-3.4°
vs. average
Normal: 66.9°F (1991–2020)
0.84"
Precipitation
32nd-wettest of 153
+0.48"
vs. average
Normal: 0.36" · 233% of normal

Average Temperature by Year — Sep 1 – Sep 10

1874–2026 · 2026 highlighted · trend +0.36° per decade (warming since 1874)

Precipitation by Year — Sep 1 – Sep 10

1872–2026 · 2026 highlighted · trend -0.02" per decade (drier since 1872)

Warmest Sep 1 – Sep 10 on Record

# Year Avg Temp
1 2017 74.1°F
2 1944 73.6°F
3 2020 73.4°F
4 1935 71.9°F
5 2024 71.9°F
6 2022 71.5°F
7 1993 71.4°F
8 1963 71.4°F
9 1957 70.5°F
10 1943 70.4°F

Coolest Sep 1 – Sep 10 on Record

# Year Avg Temp
1 1897 57.2°F
2 1895 57.4°F
3 1901 57.9°F
4 1884 58.1°F
5 1914 58.8°F
6 1893 59.3°F
7 1912 59.4°F
8 2000 59.9°F
9 1875 60.3°F
10 1985 60.5°F

Wettest Sep 1 – Sep 10 on Record

# Year Total
1 1911 4.20"
2 1897 2.43"
3 1919 2.40"
4 1884 2.35"
5 1945 2.32"
6 1971 2.07"
7 1913 2.02"
8 1927 1.91"
9 1941 1.81"
10 1874 1.67"

Driest Sep 1 – Sep 10 on Record

# Year Total
1 2024 0.00"
2 2022 0.00"
3 2021 0.00"
4 2020 0.00"
5 2014 0.00"
6 2011 0.00"
7 2008 0.00"
8 2006 0.00"
9 2004 0.00"
10 2002 0.00"
About this data. Pick any start and end date and this becomes the same kind of review as the Month and Fall tabs, just for exactly the window you asked for — the generalized version of the same engine, evaluated across every year on record. Average temperature is the mean of each day's (high + low) / 2; precipitation is the sum of daily totals. A year missing more than about a fifth of the window's days is excluded from the temperature ranking; any missing day excludes a year from the precipitation ranking, since an unreported day is unreported rain. Ranges that cross from December into January aren't supported yet. Normals are the 1991–2020 mean for the same window.
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