Boston, MA
Massachusetts · Records since 1872–2026
☀️ 73°F
Currently in Boston
As of 7:00 PM EDT
Records for July 27
🔥 Record High
98°F
July 27, 1882
+16° from 82° normal❄ Record Low
52°F
July 27, 1876
-14° from 66° normal
🌞 Normal high: 82°F 🌑 Normal low: 66°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 — July 27
| # | Temp | Date |
|---|---|---|
| 🏆 | 98°F | July 27, 1882 |
| 2 | 97°F | July 27, 1963 |
| 3 | 97°F | July 27, 1949 |
| 4 | 95°F | July 27, 2020 |
| 5 | 94°F | July 27, 2005 |
| 6 | 94°F | July 27, 1964 |
| 7 | 94°F | July 27, 1921 |
| 8 | 93°F | July 27, 1995 |
| 9 | 93°F | July 27, 1989 |
| 10 | 93°F | July 27, 1980 |
Top 5 Record Lows — July 27
| # | Temp | Date |
|---|---|---|
| 🥶 | 52°F | July 27, 1876 |
| 2 | 55°F | July 27, 1897 |
| 3 | 56°F | July 27, 2001 |
| 4 | 56°F | July 27, 1920 |
| 5 | 56°F | July 27, 1884 |
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
9
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
94 of 207 days with data were above the 1991–2020 normal high for their date.
Days ≥ 90°F Per Year
1872–202613
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
36
2026 so far
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
15.38"
2026 YTD
Normal: 24.26"
-8.88"
3.43"
July so far
July normal: 3.27"
+0.16"
4.89"
Summer so far
Summer normal: 10.39"
-5.50"
2
2026 heavy rain days
Days with ≥ 1.0"
Monthly Precipitation — Last 24 Months
Blue = actual · dashed line = monthly normal
Annual Precipitation Per Year (1970–2026)
Blue = above average · tan = below average · gold = 2026 (partial)
Heavy Rain Days Per Year (≥ 1.0")
Compare year-to-year changes in days with heavy rainfall (≥ 1.0")