Portland, OR

Oregon · Records since 1940–2026

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

Records for September 11

🔥 Record High

95°F

September 11, 2013

+17° from 78° normal

❄ Record Low

43°F

September 11, 1964

-12° from 55° normal
🌞 Normal high: 78°F 🌑 Normal low: 55°F 1991–2020 normals

All-Time Records — Portland

🔥
116°F
Hottest Day Ever
Jun 28, 2021
❄
-3°F
Coldest Day Ever
Feb 2, 1950
🌧
2.69"
Wettest Day Ever
Nov 19, 1996
☃
14.4"
Most Snow in One Day
Jan 21, 1943

First & Last Dates — Portland

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)
307 days
Longest growing season
2016
173 days
Shortest growing season
1964
242 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 95°F September 11, 2013
2 94°F September 11, 2015
3 94°F September 11, 2009
4 93°F September 11, 2011
5 91°F September 11, 2017
6 91°F September 11, 2008
7 90°F September 11, 1975
8 89°F September 11, 2007
9 89°F September 11, 1957
10 87°F September 11, 1969

Top 5 Record Lows — September 11

# Temp Date
🥶 43°F September 11, 1964
2 44°F September 11, 1988
3 44°F September 11, 1986
4 45°F September 11, 1952
5 46°F September 11, 1942
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 1940–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Portland

threshold: 90°F (90th percentile of historical Jun–Aug highs)
3.9
Avg heat wave length
days (historical)
99°
Avg peak temp
during heat waves
0
Dangerous nights 2026
Overnights ≥ 70°F
3
Heat waves 2026
so far

Days ≥ 90°F Per Year

1941–2026
18
2026 so far
13
Avg/year 1970–2025
22
Avg/year (last 10 complete)
31
Most in a year (2018)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Portland

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 25, 2009 – Aug 3, 2009 10 106°F (Jul 28) 97°F 65°F
2 Jul 22, 2018 – Jul 30, 2018 9 99°F (Jul 29) 94°F 62°F
3 Jul 24, 2022 – Jul 31, 2022 8 102°F (Jul 26) 98°F 67°F
4 Aug 12, 1967 – Aug 19, 1967 8 98°F (Aug 15) 94°F 59°F
5 Jun 29, 2015 – Jul 6, 2015 8 97°F (Jul 2) 94°F 63°F
6 Aug 3, 1972 – Aug 9, 1972 7 104°F (Aug 7) 96°F 61°F
7 Jul 4, 2024 – Jul 10, 2024 7 104°F (Jul 9) 98°F 64°F
8 Sep 4, 1944 – Sep 10, 1944 7 101°F (Sep 5) 94°F 55°F
9 Aug 12, 2023 – Aug 17, 2023 6 108°F (Aug 14) 100°F 68°F
10 Aug 6, 1981 – Aug 11, 1981 6 107°F (Aug 8) 103°F 64°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

Nights where the overnight low exceeded the 1991–2020 normal low

48
2026 total
above-normal nights
34.5
Avg / summer
1970–2020
67
Most in a summer
2022

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 (1940–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1940, annual totals have trended +0.02" per decade, about +0.2" 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 is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

127 of 253 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

17.86"
2026 YTD
Normal: 21.13"
-3.27"
0.66"
September so far
September normal: 1.52"
-0.86"
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 is 3.27" 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)
64.6°F
Average temperature
28th-coolest of 86
-2.9°
vs. average
Normal: 67.5°F (1991–2020)
0.66"
Precipitation
23rd-wettest of 86
+0.35"
vs. average
Normal: 0.31" · 213% of normal

Average Temperature by Year — Sep 1 – Sep 10

1941–2026 · 2026 highlighted · trend +0.60° per decade (warming since 1941)

Precipitation by Year — Sep 1 – Sep 10

1941–2026 · 2026 highlighted · trend -0.03" per decade (drier since 1941)

Warmest Sep 1 – Sep 10 on Record

# Year Avg Temp
1 2017 74.6°F
2 2020 74.1°F
3 2024 74.0°F
4 2022 73.2°F
5 2011 72.1°F
6 1944 71.7°F
7 1993 71.5°F
8 2025 71.0°F
9 2021 70.7°F
10 1998 70.3°F

Coolest Sep 1 – Sep 10 on Record

# Year Avg Temp
1 1964 59.1°F
2 2000 60.4°F
3 1961 61.8°F
4 1978 61.8°F
5 1960 62.1°F
6 1970 62.1°F
7 1941 62.2°F
8 1956 62.2°F
9 1954 62.4°F
10 1985 62.5°F

Wettest Sep 1 – Sep 10 on Record

# Year Total
1 1945 2.02"
2 1971 2.01"
3 1941 1.96"
4 1979 1.74"
5 1985 1.68"
6 1978 1.63"
7 2010 1.57"
8 2013 1.42"
9 1959 1.18"
10 1994 1.08"

Driest Sep 1 – Sep 10 on Record

# Year Total
1 2022 0.00"
2 2021 0.00"
3 2020 0.00"
4 2014 0.00"
5 2011 0.00"
6 2008 0.00"
7 2005 0.00"
8 2002 0.00"
9 1999 0.00"
10 1998 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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