Portsmouth, New Hampshire, United States Climate Change Severity

48
High
The current climate change severity in Portsmouth is High, with no significant change in the climate score compared to last 15 years. This suggests stable conditions, where environmental indicators have remained consistent without notable improvements or deteriorations.
Data: Jan. to Jul. (Historical Vs 2025) - Weather Data Only
Low
020
Moderate
40
High
60
Very High
80
Extreme
100
°C

Portsmouth Weather Condition Changes (Historic Vs 2025)

2025
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Historic
2025

Over the past 15 year(s), Portsmouth temperature has changed by around +3.8%, and has experienced notable climate changes.

Sunny
Cloudy
Rainy
Snowy
Misty
Data: Jan. to Jul. (Historical Vs 2025)

Comparison of Weather Condition (Historic Vs 2025)

HistoricDays

Year 2025Days

Change

sunnySunny
3533
-5.7%
cloudyCloudy
6037
-38.3%
rainyRainy
7670
-7.8%
snowySnowy
87
-12.5%
mistyMisty
03
100%

Disclaimer: Other weather conditions not shown may affect the total day count.

Climate Change Indicators:

Over the past 15 years, Portsmouth has experienced measurable shifts in key climate parameters, contributing to the current severity score of 48 (within the High severity category). This suggests stable but high-risk conditions. Here’s a breakdown of the specific changes observed:

Severity Score

48/100

High

Low
020
Moderate
40
High
60
Very High
80
Extreme
100

From 2010 to 2025, Portsmouth experienced significant changes:

Temperature change of

+0.3 °C

Variation in annual rainfall

+36.8 %

Change in average humidity

-9.3 %

PM2.5 levels surged by

-18.9 %

Heatwave changed by

+2.7 day(s)

Coldwave changed by

-6 day(s)

Wind speeds changed by

-0.6 km/h

Although the indicators show no significant change, Portsmouth’s High severity status emphasizes the need for long-term climate mitigation and adaptation measures.

Check how we calculate Climate Change Severity
Based on data from Jan. to Jul.

Portsmouth Weather Forecast 30 Days (August - September 2025)
Portsmouth, New Hampshire, United States

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Fri. 8, Aug.
partly cloudyPartly Cloudy
Temperature Icon27°/15°
Humidity Icon69%
Wind Icon20km/h
Sat. 9, Aug.
sunnySunny
Temperature Icon29°/15°
Humidity Icon74%
Wind Icon18km/h
Sun. 10, Aug.
partly cloudyPartly Cloudy
Temperature Icon24°/14°
Humidity Icon88%
Wind Icon18km/h
Mon. 11, Aug.
partly cloudyPartly Cloudy
Temperature Icon31°/15°
Humidity Icon66%
Wind Icon17km/h
Tue. 12, Aug.
sunnySunny
Temperature Icon32°/20°
Humidity Icon58%
Wind Icon19km/h
Wed. 13, Aug.
sunnySunny
Temperature Icon31°/20°
Humidity Icon60%
Wind Icon21km/h
Thu. 14, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon30°/20°
Humidity Icon75%
Wind Icon17km/h
Fri. 15, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon31°/21°
Humidity Icon77%
Wind Icon14km/h
Sat. 16, Aug.
sunnySunny
Temperature Icon31°/21°
Humidity Icon77%
Wind Icon13km/h
Sun. 17, Aug.
sunnySunny
Temperature Icon29°/20°
Humidity Icon75%
Wind Icon16km/h
Mon. 18, Aug.
sunnySunny
Temperature Icon31°/22°
Humidity Icon69%
Wind Icon14km/h
Tue. 19, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon32°/21°
Humidity Icon77%
Wind Icon15km/h
Wed. 20, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon19°/17°
Humidity Icon96%
Wind Icon16km/h
Thu. 21, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon27°/16°
Humidity Icon84%
Wind Icon14km/h
Fri. 22, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon24°/18°
Humidity Icon81%
Wind Icon18km/h
Sat. 23, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon24°/17°
Humidity Icon77%
Wind Icon18km/h
Sun. 24, Aug.
heavy rain at timesHeavy rain at times
Temperature Icon25°/17°
Humidity Icon77%
Wind Icon15km/h
Mon. 25, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon25°/17°
Humidity Icon79%
Wind Icon19km/h
Tue. 26, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon26°/17°
Humidity Icon76%
Wind Icon16km/h
Wed. 27, Aug.
heavy rain at timesHeavy rain at times
Temperature Icon25°/16°
Humidity Icon76%
Wind Icon14km/h
Thu. 28, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon24°/16°
Humidity Icon78%
Wind Icon17km/h
Fri. 29, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon24°/16°
Humidity Icon78%
Wind Icon18km/h
Sat. 30, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon26°/16°
Humidity Icon75%
Wind Icon17km/h
Sun. 31, Aug.
heavy rain at timesHeavy rain at times
Temperature Icon26°/16°
Humidity Icon71%
Wind Icon17km/h
Mon. 1, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon23°/16°
Humidity Icon74%
Wind Icon16km/h
Tue. 2, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon23°/15°
Humidity Icon79%
Wind Icon15km/h
Wed. 3, Sep.
heavy rain at timesHeavy rain at times
Temperature Icon25°/16°
Humidity Icon80%
Wind Icon16km/h
Thu. 4, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon25°/16°
Humidity Icon77%
Wind Icon17km/h
Fri. 5, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon23°/16°
Humidity Icon77%
Wind Icon19km/h
Sat. 6, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon23°/16°
Humidity Icon79%
Wind Icon18km/h
Sun. 7, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon23°/15°
Humidity Icon79%
Wind Icon17km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onTue. 19, Aug.

32.1°C

Low will be onSun. 10, Aug.

14.3°C

HumidityHumidity

High will be onWed. 20, Aug.

96%

Low will be onTue. 12, Aug.

58%

Wind SpeedWind Speed

High will be onWed. 13, Aug.

20.9km/h

Low will be onSat. 16, Aug.

13.3km/h

PrecipitationPrecipitation

High will be onFri. 29, Aug.

9.1mm

Low will be onSat. 16, Aug.

0.03mm

Ultraviolet IndexUV

High will be onMon. 18, Aug.

7

Low will be onTue. 12, Aug.

0.2

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