As of 12:04 EDT

Weather in Southwest Harbor, ME

77°

Southwest Harbor, Sunday, 9 August, 12:04

Overcast. Feels like 78°. High 83°, low 66°.

Pressure29.85 inHg

Wind8.5 mph SW

Humidity77%

Visibility2.3 mi

Dew point71°

See detailed hourly forecast

Mon, 1083° / 65°

0.01

83 °

Southwest Harbor, Monday, 10 August

Light rain. High 83°, low 65°.

Pressure29.94 inHg

Wind9.5 mph SW

Humidity68%

Visibility6.2 mi

Dew point58°

Tue, 1170° / 61°

0.02

70 °

Southwest Harbor, Tuesday, 11 August

Light rain. High 70°, low 61°.

Pressure29.71 inHg

Wind8.9 mph SW

Humidity75%

Visibility6.2 mi

Dew point61°

Wed, 1271° / 60°

71 °

Southwest Harbor, Wednesday, 12 August

Mostly clear. High 71°, low 60°.

Pressure29.77 inHg

Wind9.7 mph W

Humidity51%

Visibility6.2 mi

Dew point52°

Thu, 1366° / 60°

0.18

66 °

Southwest Harbor, Thursday, 13 August

Light rain. High 66°, low 60°.

Pressure29.62 inHg

Wind10.4 mph SW

Humidity90%

Visibility3.2 mi

Dew point61°

Fri, 1469° / 58°

69 °

Southwest Harbor, Friday, 14 August

Partly cloudy. High 69°, low 58°.

Pressure29.71 inHg

Wind22.2 mph W

Humidity64%

Visibility—

Dew point50°

Sat, 1571° / 59°

71 °

Southwest Harbor, Saturday, 15 August

Clear. High 71°, low 59°.

Pressure29.91 inHg

Wind14.1 mph NW

Humidity50%

Visibility—

Dew point47°

Sun, 1668° / 56°

68 °

Southwest Harbor, Sunday, 16 August

Clear. High 68°, low 56°.

Pressure30.09 inHg

Wind10.2 mph SW

Humidity54%

Visibility—

Dew point49°

Mon, 1764° / 60°

64 °

Southwest Harbor, Monday, 17 August

Light rain. High 64°, low 60°.

Pressure30.06 inHg

Wind11.8 mph S

Humidity74%

Visibility—

Dew point55°

Tue, 1860° / 58°

0.37

60 °

Southwest Harbor, Tuesday, 18 August

Rain. High 60°, low 58°.

Pressure29.94 inHg

Wind16.3 mph NE

Humidity98%

Visibility—

Dew point58°

Wed, 1963° / 56°

63 °

Southwest Harbor, Wednesday, 19 August

Partly cloudy. High 63°, low 56°.

Pressure30.00 inHg

Wind9.3 mph S

Humidity81%

Visibility—

Dew point55°

Thu, 2062° / 59°

0.09

62 °

Southwest Harbor, Thursday, 20 August

Light rain. High 62°, low 59°.

Pressure29.77 inHg

Wind10.3 mph S

Humidity93%

Visibility—

Dew point58°

Fri, 2164° / 61°

0.23

64 °

Southwest Harbor, Friday, 21 August

Light rain. High 64°, low 61°.

Pressure29.83 inHg

Wind7.2 mph NE

Humidity99%

Visibility—

Dew point62°

Sat, 2266° / 60°

66 °

Southwest Harbor, Saturday, 22 August

Overcast. High 66°, low 60°.

Pressure29.97 inHg

Wind8.6 mph S

Humidity88%

Visibility—

Dew point60°

Sun, 2365° / 61°

0.3

65 °

Southwest Harbor, Sunday, 23 August

Rain. High 65°, low 61°.

Pressure29.83 inHg

Wind21.3 mph S

Humidity96%

Visibility—

Dew point62°

Mon, 2466° / 57°

66 °

Southwest Harbor, Monday, 24 August

Clear. High 66°, low 57°.

Pressure30.06 inHg

Wind13.8 mph W

Humidity54%

Visibility—

Dew point45°

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 Southwest Harbor, ME 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 Southwest Harbor, ME 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.