Weather Forecast for Portsmouth (US)
New Hampshire, United States of America
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Current Weather - Portsmouth (US): 16°C
Current Weather - Portsmouth (US): 16°C
New Hampshire, United States of America
Overcast
Feels like 11°C
Wind
29 km/h NE
Humidity
64%
Pressure
1021 mb
UV Index
1
Visibility
10 km
Overcast
Friday, September 25, 2026
High
17°C
Low
11°C
Rain Chance
18%
Hourly Forecast
16°C
16°C
16°C
Day Statistics
Maximum Wind
32 km/h
Humidity
71%
Precipitation
0 mm
UV Index
3
Visibility
10 km
Rain Chance
18%
Snow Chance
0%
Sun & Moon
Sunrise
06:33 AM
Sunset
06:35 PM
Moonrise
06:02 PM
Moonset
05:28 AM
Moon Phase
Full Moon
Moon Illumination
100%
Air Quality
PM2.5
3.7
μg/m³
PM10
4.1
μg/m³
NO₂
3.5
μg/m³
O₃
67.8
μg/m³
SO₂
1
μg/m³
CO
141.5
μg/m³
Overcast
Saturday, September 26, 2026
High
17°C
Low
13°C
Rain Chance
87%
Hourly Forecast
16°C
16°C
15°C
15°C
15°C
15°C
15°C
15°C
15°C
15°C
15°C
15°C
16°C
16°C
17°C
15°C
14°C
14°C
14°C
14°C
13°C
13°C
13°C
14°C
Day Statistics
Maximum Wind
48 km/h
Humidity
77%
Precipitation
18 mm
UV Index
0
Visibility
9 km
Rain Chance
87%
Snow Chance
0%
Sun & Moon
Sunrise
06:34 AM
Sunset
06:33 PM
Moonrise
06:20 PM
Moonset
06:32 AM
Moon Phase
Full Moon
Moon Illumination
99%
Air Quality
PM2.5
2.2
μg/m³
PM10
2.5
μg/m³
NO₂
2.1
μg/m³
O₃
66.1
μg/m³
SO₂
0.6
μg/m³
CO
125.5
μg/m³
Light rain shower
Sunday, September 27, 2026
High
14°C
Low
13°C
Rain Chance
93%
Hourly Forecast
14°C
13°C
14°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
14°C
14°C
14°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
Day Statistics
Maximum Wind
47 km/h
Humidity
93%
Precipitation
14 mm
UV Index
0
Visibility
10 km
Rain Chance
93%
Snow Chance
0%
Sun & Moon
Sunrise
06:36 AM
Sunset
06:32 PM
Moonrise
06:40 PM
Moonset
07:38 AM
Moon Phase
Waning Gibbous
Moon Illumination
96%
Air Quality
PM2.5
2.1
μg/m³
PM10
3
μg/m³
NO₂
1.3
μg/m³
O₃
73.4
μg/m³
SO₂
0.5
μg/m³
CO
111.5
μg/m³
Light rain shower
Monday, September 28, 2026
High
14°C
Low
13°C
Rain Chance
93%
Hourly Forecast
13°C
13°C
13°C
13°C
14°C
13°C
14°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
Day Statistics
Maximum Wind
43 km/h
Humidity
95%
Precipitation
23 mm
UV Index
1
Visibility
10 km
Rain Chance
93%
Snow Chance
0%
Sun & Moon
Sunrise
06:37 AM
Sunset
06:30 PM
Moonrise
07:03 PM
Moonset
08:45 AM
Moon Phase
Waning Gibbous
Moon Illumination
91%
Air Quality
PM2.5
1.9
μg/m³
PM10
2.6
μg/m³
NO₂
2
μg/m³
O₃
63.8
μg/m³
SO₂
0.4
μg/m³
CO
119.2
μg/m³
Patchy rain nearby
Tuesday, September 29, 2026
High
13°C
Low
13°C
Rain Chance
93%
Hourly Forecast
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
13°C
Day Statistics
Maximum Wind
35 km/h
Humidity
95%
Precipitation
17 mm
UV Index
3
Visibility
10 km
Rain Chance
93%
Snow Chance
0%
Sun & Moon
Sunrise
06:38 AM
Sunset
06:28 PM
Moonrise
07:31 PM
Moonset
09:56 AM
Moon Phase
Waning Gibbous
Moon Illumination
84%
Air Quality
PM2.5
1.3
μg/m³
PM10
1.5
μg/m³
NO₂
2.5
μg/m³
O₃
55.9
μg/m³
SO₂
0.6
μg/m³
CO
171.2
μg/m³
Overcast
Wednesday, September 30, 2026
High
21°C
Low
13°C
Rain Chance
35%
Hourly Forecast
13°C
13°C
14°C
14°C
14°C
14°C
14°C
14°C
14°C
16°C
17°C
19°C
19°C
20°C
21°C
20°C
19°C
19°C
19°C
19°C
19°C
18°C
17°C
17°C
Day Statistics
Maximum Wind
11 km/h
Humidity
84%
Precipitation
0 mm
UV Index
5
Visibility
10 km
Rain Chance
35%
Snow Chance
0%
Sun & Moon
Sunrise
06:39 AM
Sunset
06:26 PM
Moonrise
08:06 PM
Moonset
11:08 AM
Moon Phase
Waning Gibbous
Moon Illumination
75%
Overcast
Thursday, October 01, 2026
High
22°C
Low
16°C
Rain Chance
25%
Hourly Forecast
17°C
17°C
17°C
17°C
16°C
16°C
16°C
17°C
17°C
18°C
18°C
19°C
20°C
21°C
21°C
22°C
22°C
22°C
22°C
21°C
20°C
20°C
19°C
19°C
Day Statistics
Maximum Wind
15 km/h
Humidity
84%
Precipitation
0 mm
UV Index
5
Visibility
10 km
Rain Chance
25%
Snow Chance
0%
Sun & Moon
Sunrise
06:40 AM
Sunset
06:24 PM
Moonrise
08:52 PM
Moonset
12:19 PM
Moon Phase
Last Quarter
Moon Illumination
66%
Solar Radiation Data
Shortwave Radiation
307.86
Diffuse Radiation
163.86
DNI
0
GTI
0
Weather Alerts
Small Craft Advisory issued September 25 at 2:26AM EDT until September 25 at 8:00AM EDT by NWS Gray ME
* WHAT...For the Small Craft Advisory, northeast winds 10 to 15 kt with gusts up to 25 kt and seas 5 to 8 ft. For the Gale Warning, northeast winds 20 to 30 kt with gusts up to 45 kt and seas 10 to 15 ft expected. * WHERE...Coastal Waters from Cape Elizabeth, ME to Merrimack River, MA out 25 NM. * WHEN...For the Small Craft Advisory, until 8 AM EDT this morning. For the Gale Warning, from 8 PM this evening to 8 PM EDT Sunday. * IMPACTS...Strong winds will cause hazardous seas which could capsize or damage vessels and reduce visibility.
Mariners should alter plans to avoid these hazardous conditions. Remain in port, seek safe harbor, alter course, and/or secure the vessel for severe conditions.
Gale Warning issued September 25 at 2:26AM EDT until September 27 at 8:00PM EDT by NWS Gray ME
* WHAT...For the Small Craft Advisory, northeast winds 10 to 15 kt with gusts up to 25 kt and seas 5 to 8 ft. For the Gale Warning, northeast winds 20 to 30 kt with gusts up to 45 kt and seas 10 to 15 ft expected. * WHERE...Coastal Waters from Cape Elizabeth, ME to Merrimack River, MA out 25 NM. * WHEN...For the Small Craft Advisory, until 8 AM EDT this morning. For the Gale Warning, from 8 PM this evening to 8 PM EDT Sunday. * IMPACTS...Strong winds will cause hazardous seas which could capsize or damage vessels and reduce visibility.
Mariners should alter plans to avoid these hazardous conditions. Remain in port, seek safe harbor, alter course, and/or secure the vessel for severe conditions.
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