Portsmouth (US)
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Weather Forecast for Portsmouth (US)

New Hampshire, United States of America

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Light drizzle

Current Weather - Portsmouth (US): 21°C

New Hampshire, United States of America

Light drizzle

Feels like 18°C

Wind

25 km/h SSW

Humidity

77%

Pressure

1009 mb

UV Index

0

Visibility

9 km
Sunny

Sunny

Thursday, September 10, 2026

High

28°C

Low

18°C

Rain Chance

69%

Hourly Forecast

Sunny 20°C
07:00
Sunny 20°C
08:00
Sunny 22°C
09:00
Cloudy 25°C
10:00
Cloudy 26°C
11:00
Cloudy 27°C
12:00
Partly Cloudy 28°C
13:00
Sunny 28°C
14:00
Sunny 28°C
15:00
Sunny 27°C
16:00
Sunny 26°C
17:00
Partly Cloudy 25°C
18:00
Overcast 23°C
19:00
Overcast 22°C
20:00
Overcast 21°C
21:00
Overcast 19°C
22:00
Overcast 18°C
23:00
Sep 11

Day Statistics

Maximum Wind

28 km/h

Humidity

63%

Precipitation

9 mm

UV Index

6

Visibility

10 km

Rain Chance

69%

Snow Chance

0%

Sun & Moon

Sunrise

06:17 AM

Sunset

07:02 PM

Moonrise

05:17 AM

Moonset

06:39 PM

Moon Phase

New Moon

Moon Illumination

0%

Air Quality

PM2.5

2.9

μg/m³

PM10

3

μg/m³

NO₂

2.7

μg/m³

O₃

87.4

μg/m³

SO₂

0.6

μg/m³

CO

144.1

μg/m³

US EPA Index: 1 GB DEFRA Index: 1

Weather Alerts

Small Craft Advisory issued September 9 at 2:58PM EDT until September 10 at 8:00PM EDT by NWS Boston/Norton MA

Massachusetts Bay and Ipswich Bay Sep 9, 02:58 PM - Sep 10, 04:00 AM
Severity: Minor Urgency: Expected

* WHAT...Southwest winds 15 to 25 kt with gusts up to 30 kt and seas 2 to 3 feet expected. * WHERE...Massachusetts Bay and Ipswich Bay. * WHEN...From 8 PM this evening to 8 PM EDT Thursday. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.

Event: Small Craft Advisory Certainty: Likely Category: Met