Portland, ME

Maine · Records since 1874–2026

☀️ 78°F
Currently in Portland
As of 2:00 PM EDT

Records for September 7

🔥 Record High

95°F

September 7, 1945

+21° from 74° normal

❄ Record Low

33°F

September 7, 1962

-22° from 55° normal
🌞 Normal high: 74°F 🌑 Normal low: 55°F 1991–2020 normals

All-Time Records — Portland

🔥
103°F
Hottest Day Ever
Aug 2, 1975
❄
-39°F
Coldest Day Ever
Feb 16, 1943
🌧
11.74"
Wettest Day Ever
Oct 21, 1996
☃
22.3"
Most Snow in One Day
Dec 17, 1970

Top 10 Record Highs — September 7

# Temp Date
🏆 95°F September 7, 1945
2 94°F September 7, 1881
3 92°F September 7, 2015
4 92°F September 7, 2007
5 89°F September 7, 1983
6 86°F September 7, 2023
7 86°F September 7, 1901
8 83°F September 7, 1886
9 82°F September 7, 2012
10 82°F September 7, 1947

Top 5 Record Lows — September 7

# Temp Date
🥶 33°F September 7, 1962
2 38°F September 7, 1942
3 39°F September 7, 1984
4 39°F September 7, 1949
5 39°F September 7, 1888
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

threshold: 86°F (90th percentile of historical Jun–Aug highs)
3.7
Avg heat wave length
days (historical)
93°
Avg peak temp
during heat waves
4
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

2026 Daily High Temperature vs Normal

Year to date
Above normal Below normal

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

Days ≥ 90°F Per Year

1874–2026
7
2026 so far
5
Avg/year 1970–2025
6
Avg/year (last 10 complete)
16
Most in a year (1955)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Portland

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 6, 1988 – Jul 13, 1988 8 93°F (Jul 11) 90°F 65°F
2 Aug 12, 2002 – Aug 19, 2002 8 93°F (Aug 14) 89°F 66°F
3 Jul 15, 1991 – Jul 21, 1991 7 96°F (Jul 21) 91°F 65°F
4 Aug 5, 1876 – Aug 11, 1876 7 95°F (Aug 7) 90°F 68°F
5 Jul 13, 1952 – Jul 19, 1952 7 94°F (Jul 14) 91°F 62°F
6 Jul 23, 1970 – Jul 29, 1970 7 93°F (Jul 24) 90°F 64°F
7 Jul 24, 2020 – Jul 30, 2020 7 93°F (Jul 27) 90°F 70°F
8 Aug 11, 1944 – Aug 16, 1944 6 99°F (Aug 11) 95°F 68°F
9 Jul 16, 1977 – Jul 21, 1977 6 99°F (Jul 21) 92°F 65°F
10 Jul 6, 1993 – Jul 11, 1993 6 98°F (Jul 10) 92°F 67°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
34.0
Avg / summer
1970–2020
63
Most in a summer
2020

Above-Normal Summer Nights Per Year

Average June–August Low by Decade

Overnight lows · complete decades only

Precipitation

Actual vs. 1991–2020 full-month and full-season normals

26.82"
2026 YTD
Normal: 31.03"
-4.21"
0.08"
September so far
September normal: 3.77"
-3.69"
8
2026 heavy rain days
Days with ≥ 1.0"

2026 Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Portland is 4.21" behind the normal pace

Monthly Precipitation — Last 24 Months

Blue = actual · dashed line = monthly normal

Annual Precipitation Per Year (1871–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1871, annual totals have trended +0.51" per decade, about +7.8" across the record.

Heavy Rain Days Per Year (≥ 1.0")

Compare year-to-year changes in days with heavy rainfall (≥ 1.0")

Month in Review — August 2026

70.5°F

Average temperature · August 2026

45th-warmest month on record

15th-warmest August of 153 on record

+1.8° vs. 68.7° average (1991–2020)
73.7°F
Warmest month ever
July 2020
72.5°F
Warmest August ever
1937
96°F
Hottest of 2026
Jul 2

Average August Temperature by Year

1874–2026 · 2026 highlighted · trend +0.18° per decade (warming since 1874)

Precipitation — August 2026

Month total against the 1991–2020 average and every other August on record

2.71"
Total precipitation
August 2026
-0.86"
vs. average
Normal: 3.57" · 76% of normal
76th-driest
August rank
of 153 on record
15.22"
Wettest August ever
1991 · driest 0.27" (1947)

August Precipitation by Year

1871–2026 · 2026 highlighted

Wettest Augusts on Record

# Year Total
1 1991 15.22"
2 2014 8.56"
3 1946 8.30"
4 1892 8.14"
5 1877 7.90"
6 1872 6.97"
7 1887 6.56"
8 2008 6.28"
9 2012 6.21"
10 2004 6.14"

Driest Augusts on Record

# Year Total
1 1947 0.27"
2 1883 0.36"
3 1995 0.47"
4 1996 0.50"
5 2025 0.53"
6 1876 0.54"
7 1925 0.55"
8 1944 0.59"
9 1882 0.66"
10 1972 0.80"

Warmest Augusts on Record

# Year Avg Temp
1 1937 72.5°F
2 2018 72.2°F
3 2022 72.1°F
4 2016 71.8°F
5 2020 71.6°F
6 1969 71.3°F
7 1876 71.3°F
8 1938 71.2°F
9 1980 71.2°F
10 1988 71.1°F

Warmest Months on Record (Any Month)

# Month Avg Temp
1 July 2020 73.7°F
2 July 2024 73.1°F
3 July 1876 73.1°F
4 July 2019 73.1°F
5 July 1878 73.0°F
6 July 2011 72.7°F
7 August 1937 72.5°F
8 July 1994 72.4°F
9 July 2010 72.2°F
10 July 2022 72.2°F

Nearby Stations — August 2026

How the same month ranked at the closest reporting stations

Station Avg Temp August Rank
Portland, ME 70.5°F 15th of 153
Concord, NH 71.9°F 11th of 158
Manchester, NH 72.6°F 14th of 66
Boston, MA 75.2°F 6th of 155
Milton, MA 73.2°F 11th of 134
About this data. Monthly averages are the mean of daily average temperatures, computed from NOAA Threadex records via RCC ACIS. Months missing more than three days of observations are excluded from the rankings, so the in-progress month never appears. Rankings cover 1,827 complete months on record. Precipitation totals sum the daily reports for the month, with trace amounts counted as zero. A month missing any day of precipitation data is left out entirely (an unreported day is unreported rain), so the precipitation ranking covers 153 complete Augusts. Normals are the 1991–2020 mean for the same calendar month. Trend lines are a least-squares fit across every year shown.

Fall in Review — Fall 2026

September 1 – November 30, 2026

Fall 2026 is still under way. Season totals and rankings appear once November closes; the markers below update as they happen.

Summer to Winter — 2026

Each turning point of the season against its 1991–2020 normal date, with the earliest and latest on record

Marker 2026 Normal vs. normal Earliest Latest Drift
Last 90°F day
The final day of summer heat
 Aug 9
so far
 Aug 12 May 10, 1889 Sep 26, 2007 +1.3 d/decade
Last 80°F day
The last genuinely warm afternoon
 Sep 4
so far
 Sep 22 Aug 6, 1890 Oct 31, 1946 +0.9 d/decade
First high below 50°F
The first afternoon that stays cold
 not yet Oct 23 Sep 15, 1959 Nov 10, 1994 +0.8 d/decade
First 32°F freeze
Growing season over
 not yet Oct 11 Sep 14, 1963 Nov 8, 1927 -1.1 d/decade
First 28°F hard freeze
Cold enough to end tender growth
 not yet Oct 24 Sep 14, 1963 Nov 25, 1940 -1.2 d/decade
First 20°F night
Winter cold arriving
 not yet Nov 21 Oct 12, 1964 Dec 18, 1884 -0.6 d/decade
First measurable snow
0.1" or more in a day
 not yet Nov 25 Oct 10, 1979 Dec 29, 2015 +0.7 d/decade

Drift is a least-squares fit across every year on record. Positive means the marker has been arriving later.

First Freeze by Year

The first 32°F night of each autumn since 1874 · trending -1.1 days earlier per decade

162
Normal length
1991–2020 average
222
Longest on record
1878
109
Shortest on record
1961

Growing Season Length by Year

Days between the last spring freeze and the first fall freeze · trending -2.2 days shorter per decade

Fall Average Temperature by Year

1874–2025 · 2026 highlighted · trend +0.06° per decade (warming since 1874)

Fall Precipitation by Year

1871–2025 · 2026 highlighted · trend +0.23" per decade (wetter since 1871)

About this data. Fall is meteorological autumn, September 1 through November 30, the window NOAA uses for seasonal statistics. Seasonal temperature is the day-weighted mean of the three monthly means; precipitation is their sum, and a season missing any of the three months is left out of the rankings. Freeze, heat and snow markers come from daily NOAA Threadex observations via RCC ACIS: freezes and snow are the first occurrence on or after July 1, and the last 90°F and 80°F days are the final ones anywhere in the calendar year. Growing season counts the freeze-free days between the last spring 32°F and the first fall 32°F.
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