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As of 14:20 EDT

Weather in Alton Bay, NH

85°Current weather

Alton Bay, Sunday, 9 August, 14:20

Clear. Feels like 88°. High 86°, low 66°.

Pressure29.88 inHg
Wind12.7 mph W
Humidity55%
Visibility6.2 mi
Dew point66°
Mon, 1088° / 63°0.24Rain
88 °Rain

Alton Bay, Monday, 10 August

Rain. High 88°, low 63°.

Pressure29.94 inHg
Wind7.5 mph SW
Humidity39%
Visibility6.2 mi
Dew point55°
Tue, 1183° / 61°0Partly cloudy
83 °Partly cloudy

Alton Bay, Tuesday, 11 August

Partly cloudy. High 83°, low 61°.

Pressure29.77 inHg
Wind12.7 mph NW
Humidity48%
Visibility6.2 mi
Dew point59°
Wed, 1283° / 58°0.08Light rain
83 °Light rain

Alton Bay, Wednesday, 12 August

Light rain. High 83°, low 58°.

Pressure29.80 inHg
Wind4.9 mph W
Humidity36%
Visibility6.2 mi
Dew point51°
Thu, 1379° / 57°0.1Light rain
79 °Light rain

Alton Bay, Thursday, 13 August

Light rain. High 79°, low 57°.

Pressure29.59 inHg
Wind11.5 mph W
Humidity56%
Visibility6.2 mi
Dew point60°
Fri, 1472° / 55°0Overcast
72 °Overcast

Alton Bay, Friday, 14 August

Overcast. High 72°, low 55°.

Pressure29.85 inHg
Wind14.7 mph NW
Humidity51%
Visibility—
Dew point46°
Sat, 1574° / 50°0Clear
74 °Clear

Alton Bay, Saturday, 15 August

Clear. High 74°, low 50°.

Pressure30.03 inHg
Wind13.6 mph NW
Humidity40%
Visibility—
Dew point41°
Sun, 1678° / 51°0Overcast
78 °Overcast

Alton Bay, Sunday, 16 August

Overcast. High 78°, low 51°.

Pressure30.12 inHg
Wind4.9 mph NW
Humidity37%
Visibility—
Dew point42°
Mon, 1764° / 57°0.08Light rain
64 °Light rain

Alton Bay, Monday, 17 August

Light rain. High 64°, low 57°.

Pressure30.03 inHg
Wind2.3 mph NE
Humidity70%
Visibility—
Dew point53°
Tue, 1878° / 57°0.01Light rain
78 °Light rain

Alton Bay, Tuesday, 18 August

Light rain. High 78°, low 57°.

Pressure29.94 inHg
Wind5.7 mph N
Humidity72%
Visibility—
Dew point55°
Wed, 1980° / 59°0Overcast
80 °Overcast

Alton Bay, Wednesday, 19 August

Overcast. High 80°, low 59°.

Pressure29.94 inHg
Wind9 mph S
Humidity66%
Visibility—
Dew point58°
Thu, 2080° / 62°0.14Light rain
80 °Light rain

Alton Bay, Thursday, 20 August

Light rain. High 80°, low 62°.

Pressure29.68 inHg
Wind6.3 mph S
Humidity98%
Visibility—
Dew point65°
Fri, 2177° / 61°0.02Light rain
77 °Light rain

Alton Bay, Friday, 21 August

Light rain. High 77°, low 61°.

Pressure29.85 inHg
Wind5.6 mph SE
Humidity74%
Visibility—
Dew point60°
Sat, 2283° / 59°0Partly cloudy
83 °Partly cloudy

Alton Bay, Saturday, 22 August

Partly cloudy. High 83°, low 59°.

Pressure29.94 inHg
Wind8 mph SW
Humidity37%
Visibility—
Dew point47°
Sun, 2384° / 61°1.01Heavy rain
84 °Heavy rain

Alton Bay, Sunday, 23 August

Heavy rain. High 84°, low 61°.

Pressure29.74 inHg
Wind15.4 mph W
Humidity99%
Visibility—
Dew point69°
Mon, 2473° / 55°0Clear
73 °Clear

Alton Bay, Monday, 24 August

Clear. High 73°, low 55°.

Pressure30.12 inHg
Wind12.3 mph NW
Humidity39%
Visibility—
Dew point39°

About the monthly outlook

How accurate is a 30-day forecast?

The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Alton Bay, NH are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.

What does "above normal" mean?

We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.

Where do the 66-year records come from?

They are real temperature extremes recorded in Alton Bay, NH since 1960: the highest and lowest reading for each calendar date, with the year it happened.

How often is it updated?

The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.