Boston, MA

Massachusetts · Records since 1872–2026

☀️ 81°F Feels like 76°
Currently in Boston
As of 2:15 PM EDT

Records for September 7

🔥 Record High

102°F

September 7, 1881

+26° from 76° normal

❄ Record Low

43°F

September 7, 1888

-18° from 61° normal
🌞 Normal high: 76°F 🌑 Normal low: 61°F 1991–2020 normals

All-Time Records — Boston

🔥
104°F
Hottest Day Ever
Jul 4, 1911
❄
-18°F
Coldest Day Ever
Feb 9, 1934
🌧
7.06"
Wettest Day Ever
Aug 19, 1955
☃
23.6"
Most Snow in One Day
Jan 29, 2022

Top 10 Record Highs — September 7

# Temp Date
🏆 102°F September 7, 1881
2 95°F September 7, 1945
3 94°F September 7, 2007
4 93°F September 7, 2023
5 93°F September 7, 2015
6 92°F September 7, 1983
7 89°F September 7, 1919
8 89°F September 7, 1898
9 88°F September 7, 1959
10 88°F September 7, 1929

Top 5 Record Lows — September 7

# Temp Date
🥶 43°F September 7, 1888
2 47°F September 7, 1962
3 48°F September 7, 1984
4 49°F September 7, 1885
5 50°F September 7, 1940
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 1872–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Boston

threshold: 90°F (90th percentile of historical Jun–Aug highs)
3.8
Avg heat wave length
days (historical)
96°
Avg peak temp
during heat waves
20
Dangerous nights 2026
Overnights ≥ 70°F
2
Heat waves 2026
so far

2026 Daily High Temperature vs Normal

Year to date
Above normal Below normal

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

Days ≥ 90°F Per Year

1872–2026
16
2026 so far
12
Avg/year 1970–2025
17
Avg/year (last 10 complete)
30
Most in a year (1983)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Boston

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 3, 1912 – Jul 11, 1912 9 99°F (Jul 9) 93°F 70°F
2 Aug 10, 1944 – Aug 17, 1944 8 101°F (Aug 12) 97°F 73°F
3 Aug 11, 2002 – Aug 18, 2002 8 101°F (Aug 14) 95°F 74°F
4 Jun 28, 1872 – Jul 5, 1872 8 98°F (Jul 1) 94°F 70°F
5 Jul 19, 1994 – Jul 26, 1994 8 97°F (Jul 21) 92°F 72°F
6 Jul 19, 2022 – Jul 25, 2022 7 100°F (Jul 24) 94°F 74°F
7 Jul 15, 1983 – Jul 21, 1983 7 99°F (Jul 16) 94°F 72°F
8 Jul 14, 2013 – Jul 20, 2013 7 99°F (Jul 19) 94°F 75°F
9 Jun 27, 1901 – Jul 3, 1901 7 97°F (Jun 28) 94°F 73°F
10 Aug 9, 1988 – Aug 15, 1988 7 96°F (Aug 15) 93°F 73°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

62
2026 total
above-normal nights
40.3
Avg / summer
1970–2020
61
Most in a summer
1983

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

18.39"
2026 YTD
Normal: 28.68"
-10.29"
0.83"
September so far
September normal: 3.56"
-2.73"
3
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 · Boston is 10.29" behind the normal pace

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 +0.10" per decade, about +1.6" 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

75.2°F

Average temperature · August 2026

30th-warmest month on record

6th-warmest August of 155 on record

+2.2° vs. 73.0° average (1991–2020)
78.7°F
Warmest month ever
July 2019
77.4°F
Warmest August ever
2018
3
Days ≥ 90°F
in August
101°F
Hottest of 2026
Jul 2

Longest 90°F Streak in August

3 consecutive days with highs of at least 90°F (Aug 7–9, 2026, peaking at 94°F)

The longest August streak since 2022 (4 years). The August record is 8 days, set in 1944.

Average August Temperature by Year

1872–2026 · 2026 highlighted · trend +0.29° per decade (warming since 1872)

Precipitation — August 2026

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

0.98"
Total precipitation
August 2026
-2.17"
vs. average
Normal: 3.15" · 31% of normal
7th-driest
August rank
of 154 on record
17.09"
Wettest August ever
1955 · driest 0.39" (1883)

August Precipitation by Year

1872–2026 · 2026 highlighted · trend -0.06" per decade (drier since 1872)

Wettest Augusts on Record

# Year Total
1 1955 17.09"
2 1872 10.72"
3 1946 9.92"
4 1976 7.99"
5 2011 7.74"
6 1878 7.66"
7 1885 7.64"
8 1917 7.06"
9 1994 7.03"
10 2021 7.00"

Driest Augusts on Record

# Year Total
1 1883 0.39"
2 2007 0.66"
3 1995 0.82"
4 2025 0.83"
5 1972 0.83"
6 1940 0.85"
7 2026 0.98"
8 1910 0.98"
9 1981 1.04"
10 1907 1.10"

Warmest Augusts on Record

# Year Avg Temp
1 2018 77.4°F
2 2021 76.9°F
3 2022 76.7°F
4 2016 76.4°F
5 1988 75.5°F
6 2026 75.2°F
7 2002 75.2°F
8 1973 74.8°F
9 1944 74.7°F
10 2015 74.7°F

Warmest Months on Record (Any Month)

# Month Avg Temp
1 July 2019 78.7°F
2 July 1983 78.0°F
3 July 2022 77.5°F
4 July 1952 77.5°F
5 July 1994 77.5°F
6 August 2018 77.4°F
7 July 2011 77.3°F
8 July 2010 77.2°F
9 July 1955 77.2°F
10 July 1911 77.1°F

Nearby Stations — August 2026

How the same month ranked at the closest reporting stations

Station Avg Temp August Rank
Boston, MA 75.2°F 6th of 155
Milton, MA 73.2°F 11th of 134
Worcester, MA 70.7°F 30th of 130
Providence, RI 74.1°F 19th of 122
Manchester, NH 72.6°F 14th of 66
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 1,837 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 154 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 25 May 18, 1889 Oct 12, 1954 +0.4 d/decade
Last 80°F day
The last genuinely warm afternoon
 Sep 4
so far
 Oct 1 Sep 4, 1876 Nov 6, 2024 +0.4 d/decade
First high below 50°F
The first afternoon that stays cold
 not yet Oct 28 Sep 19, 1875 Nov 15, 1946 +0.6 d/decade
First 32°F freeze
Growing season over
 not yet Nov 10 Oct 5, 1881 Dec 6, 2009 +1.1 d/decade
First 28°F hard freeze
Cold enough to end tender growth
 not yet Nov 22 Oct 5, 1881 Dec 18, 1998 +1.1 d/decade
First 20°F night
Winter cold arriving
 not yet Dec 8 Nov 5, 1879 Dec 27, 1990 +1.0 d/decade
First measurable snow
0.1" or more in a day
 not yet Nov 26 Oct 10, 1979 Dec 29, 2015

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 1872 · trending +1.1 days later per decade

220
Normal length
1991–2020 average
254
Longest on record
2009
162
Shortest on record
1883

Growing Season Length by Year

Days between the last spring freeze and the first fall freeze · trending +2.0 days longer per decade

Fall Average Temperature by Year

1872–2025 · 2026 highlighted · trend +0.24° per decade (warming since 1872)

Fall Precipitation by Year

1872–2025 · 2026 highlighted · trend +0.02" per decade (wetter since 1872)

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.
← Back to all stations