Portland, ME

Maine · Records since 1874–2026

☁️ 60°F Feels like 56°
Currently in Portland
As of 10:15 PM EDT

Records for September 26

🔥 Record High

90°F

September 26, 2007

+23° from 67° normal

❄ Record Low

27°F

September 26, 1950

-21° from 48° normal
🌞 Normal high: 67°F 🌑 Normal low: 48°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

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)
222 days
Longest growing season
1878
109 days
Shortest growing season
1961
162 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 26

# Temp Date
🏆 90°F September 26, 2007
2 88°F September 26, 1937
3 87°F September 26, 1920
4 85°F September 26, 1881
5 84°F September 26, 1961
6 84°F September 26, 1958
7 82°F September 26, 1930
8 81°F September 26, 2017
9 81°F September 26, 2011
10 81°F September 26, 1877

Top 5 Record Lows — September 26

# Temp Date
🥶 27°F September 26, 1950
2 30°F September 26, 1949
3 32°F September 26, 1976
4 32°F September 26, 1956
5 33°F September 26, 1987
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

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

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 (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")

This Year — 2026

How Portland is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

123 of 267 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

28.36"
2026 YTD
Normal: 33.26"
-4.90"
1.62"
September so far
September normal: 3.77"
-2.15"
8
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 4.90" behind the normal pace

Period Review — Sep 18 – Sep 25, 2026

Any window, evaluated against every other year on record — 8 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
55.7°F
Average temperature
46th-coolest of 153
-3.2°
vs. average
Normal: 58.9°F (1991–2020)

Average Temperature by Year — Sep 18 – Sep 25

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

Precipitation by Year — Sep 18 – Sep 25

1871–2025 · 2026 highlighted · trend +0.01" per decade (wetter since 1871)

Warmest Sep 18 – Sep 25 on Record

# Year Avg Temp
1 1914 68.9°F
2 2017 67.9°F
3 1965 67.1°F
4 1970 66.3°F
5 1891 66.1°F
6 1930 64.9°F
7 1895 64.7°F
8 2016 64.7°F
9 1946 64.5°F
10 1968 64.5°F

Coolest Sep 18 – Sep 25 on Record

# Year Avg Temp
1 1956 47.7°F
2 1950 48.6°F
3 1962 50.1°F
4 1979 50.4°F
5 1875 50.4°F
6 1973 51.4°F
7 1947 51.6°F
8 1995 52.3°F
9 1977 52.5°F
10 1886 52.6°F
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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