Portsmouth weather records
Record high and low temperatures for Portsmouth, by month, by season, and all-time, with the dates they occurred, across 1980–2026 of daily climate history. Its hottest day on record reached 28°C on 1990-08-04; its coldest fell to -6°C on 1987-01-13.
Records by month
The warmest (▲) and coldest (▼) both the daytime high and the overnight low have ever been in each calendar month, so each column shows its record high and its record low. Tap a month for its full averages and typical range.
| Month | Daytime high | Overnight low |
|---|---|---|
| January | 13°C2007-01-18
-5°C1987-01-12
|
12°C2007-01-09
-6°C1987-01-13
|
| February | 13°C2004-02-04
-4°C1991-02-07
|
12°C2004-02-04
-6°C1991-02-07
|
| March | 16°C2012-03-29
1°C1986-03-01
|
11°C2017-03-29
-2°C2018-03-01
|
| April | 20°C2007-04-16
4°C2000-04-04
|
12°C2024-04-06
0°C1996-04-02
|
| May | 22°C2018-05-26
8°C1996-05-17
|
15°C2018-05-29
4°C1997-05-07
|
| June | 25°C2020-06-25
11°C1989-06-01
|
19°C2020-06-25
6°C1991-06-04
|
| July | 26°C2022-07-19
14°C1997-07-02
|
19°C2022-07-13
10°C1996-07-07
|
| August | 28°C1990-08-04
15°C1986-08-03
|
21°C2020-08-12
9°C1986-08-29
|
| September | 25°C2023-09-09
11°C1993-09-27
|
19°C2023-09-07
8°C2010-09-25
|
| October | 21°C1997-10-01
7°C2008-10-29
|
17°C2018-10-13
2°C2008-10-29
|
| November | 17°C2005-11-02
2°C2010-11-28
|
15°C2025-11-05
-1°C2010-11-28
|
| December | 14°C1985-12-02
0°C2010-12-02
|
13°C2015-12-16
-3°C1981-12-12
|
Records by season
The warmest (▲) and coldest (▼) both the daytime high and the overnight low have reached in each meteorological season (Northern Hemisphere, each a three-month span).
| Season | Daytime high | Overnight low |
|---|---|---|
| Winter (Dec–Feb) | 14°C1985-12-02
-5°C1987-01-12
|
13°C2015-12-16
-6°C1987-01-13
|
| Spring (Mar–May) | 22°C2018-05-26
1°C1986-03-01
|
15°C2018-05-29
-2°C2018-03-01
|
| Summer (Jun–Aug) | 28°C1990-08-04
11°C1989-06-01
|
21°C2020-08-12
6°C1991-06-04
|
| Autumn (Sep–Nov) | 25°C2023-09-09
2°C2010-11-28
|
19°C2023-09-07
-1°C2010-11-28
|
All-time records
The most extreme value Portsmouth has recorded for each metric across its entire history.
High
Low
Feels-like
Humidity
Wind
Gust
Precip
For rainfall, the “driest” figure is the longest run of consecutive days without measurable rain, dated to when that dry spell began.