Weather in Islesboro

14-day forecast · updated today, Wednesday, October 28, at 12:00 am (EDT)

Now · clear 44 °F

Feels like: 38 °F
Low / high: 33 / 49 °F
Rain: 1%
Wind: 8 mph SW

↘ 30.28 inHg · falling

Today in Islesboro: partly cloudy, 33 °F to 49 °F, with a 1% chance of rain and a gentle breeze from the southwest (8 mph). Tomorrow, mainly clear, 44 °F to 60 °F and a 8% chance of rain. The warmest day of the week is Friday 30, at 62 °F. Next likely rain: Wednesday 4 (21%).

Temperatures for the next 14 days

49° 33°
Today
60° 44°
Thu 29
62° 47°
Fri 30
50° 38°
Sat 31
54° 35°
Sun 1
60° 42°
Mon 2
54° 43°
Tue 3
55° 43°
Wed 4
57° 46°
Thu 5
57° 48°
Fri 6
54° 45°
Sat 7
52° 37°
Sun 8
54° 35°
Mon 9
49° 33°
Tue 10

Day by day

Day	Sky	Low / high	Rain	Max wind	Max wave	High tides	Model
Today · 28	Partly cloudy	33 / 49 °F	1%	14 mph WSW	1.2 ft	12:38 am · 12:49 pm	HRRR
Thu 29	Mainly clear	44 / 60 °F	8%	14 mph SW	3.9 ft	1:27 am · 1:40 pm	HRRR + NBM
Fri 30	Light drizzle	47 / 62 °F	22%	12 mph W	3.9 ft	2:20 am · 2:34 pm	NBM
Sat 31	Clear sky	38 / 50 °F	0%	12 mph NW	2.0 ft	3:19 am · 3:35 pm	NBM
Sun 1	Clear sky	35 / 54 °F	0%	7 mph WSW	1.4 ft	3:22 am · 3:41 pm	NBM
Mon 2	Overcast	42 / 60 °F	6%	7 mph WSW	1.5 ft	4:30 am · 4:51 pm	NBM
Tue 3	Overcast	43 / 54 °F	11%	5 mph NE	1.9 ft	5:37 am · 6:00 pm	NBM
Wed 4	Overcast	43 / 55 °F	21% · 0.06 in	9 mph SSW	5.0 ft	6:40 am · 7:05 pm	NBM
Thu 5	Overcast	46 / 57 °F	33% · 0.41 in	9 mph S	2.5 ft	7:37 am · 8:04 pm	NBM
Fri 6	Light drizzle	48 / 57 °F	39% · 1.02 in	10 mph SE	2.2 ft	8:28 am · 8:56 pm	NBM
Sat 7	Light rain	45 / 54 °F	34% · 0.89 in	9 mph SE	2.6 ft	9:14 am · 9:44 pm	NBM
Sun 8	Heavy drizzle	37 / 52 °F	22% · 0.12 in	8 mph NE	2.3 ft	9:56 am · 10:28 pm	NBM + ECMWF
Mon 9	Clear sky	35 / 54 °F	20%	8 mph NW	1.0 ft	10:36 am · 11:09 pm	ECMWF
Tue 10	Mainly clear	33 / 49 °F	16%	6 mph NW	0.9 ft	11:14 am · 11:49 pm	ECMWF

Each hour comes from the best model for this spot: HRRR until Thursday 29 6:00 pm; then NBM until Sunday 8 8:00 pm; then ECMWF until Thursday 12 10:00 am; then GFS.

Each day comes from the best model covering this spot: regional ones first (HRRR and NBM in the U.S., AROME, ICON-EU), then ECMWF; day 16, NOAA GFS. Waves: Météo-France up to day 10, then ECMWF WAM, coarser and further offshore. High tides: our own tide calculation.

Today, every 3 hours

Time	12:00 am	3:00 am	6:00 am	9:00 am	12:00 pm	3:00 pm	6:00 pm	9:00 pm
Sky	Clear	Clear	Clear	Mainly clear	Partly cloudy	Mainly clear	Mainly clear	Clear
Temperature	39°	37°	34°	39°	47°	49°	46°	44°
Chance of rain	0%	0%	0%	0%	0%	0%	1%	1%
Rain	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in
Wind (mph)	14 NNW	9 NNE	6 NNE	2 S	6 S	11 S	8 SW	9 SW
Humidity	51%	53%	69%	70%	51%	51%	58%	59%
UV	0	0	0	1	3	1	0	0
Model	HRRR	HRRR	HRRR	HRRR	HRRR	HRRR	HRRR	HRRR

Do the models agree?

Medium confidence

They broadly agree, but not quite on rain on Friday 30: take it with some caution.

What 6 forecast models say for the next few days. The closer they are, the more reliable the forecast.

HighRainWind

Do the models agree? · High
High (°F)	Today	Thu 29	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3
ECMWF	50°	63°	61°	48°	53°	64°	57°
AIFS	51°	63°	62°	47°	53°	63°	66°
GFS	51°	63°	63°	49°	55°	61°	53°
ICON	50°	63°	62°	48°	56°	66°	59°
HRRR	49°	60°	61°	—	—	—	—
NBM	49°	60°	62°	50°	54°	60°	54°
Confidence	high	high	high	high	high	high	medium

Do the models agree? · Rain
Rain	Today	Thu 29	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3
ECMWF	0	0	0.05 in	0	0	0	0
AIFS	0	0.01 in	0.06 in	0	0	0	0
GFS	0	0	0.01 in	0	0	0	0
ICON	0	0	0.03 in	0	0	0	0
HRRR	0	0	0	—	—	—	—
NBM	0	0	0	0	0	0	0
Confidence	high	high	medium	high	high	high	high

Do the models agree? · Wind
Wind (mph)	Today	Thu 29	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3
ECMWF	815	1123	1226	1228	919	823	1021
AIFS	8	12	13	12	9	8	11
GFS	822	1132	1832	1729	613	922	1221
ICON	818	1123	1431	1536	921	1123	1430
HRRR	1422	1528	1732	—	—	—	—
NBM	616	1228	1226	1224	715	716	512
Confidence	high	high	high	high	high	high	high

Chance of rain from the ensemble models

Model	Today	Thu 29	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3
ECMWF (51 scenarios)	0%	0%	78%	0%	0%	8%	22%
GFS (GEFS, 31 scenarios)	0%	0%	45%	0%	0%	13%	19%
NBM (NOAA)	1%	8%	22%	0%	0%	6%	11%
Thunderstorm (NBM)	0%	0%	1%	0%	0%	0%	0%

Each model's day runs midnight to midnight local time; models that reach fewer days are left blank. Rain: daily total. Wind: the day's highest average wind and, in small type, the strongest gust. Highlighted: values that stand out from the rest. The chance of rain comes from many runs of the same model with slightly different starting data.

Outlook

How the coming weeks and months compare with what is normal for the time of year. It is a trend, not a day-by-day forecast.

Next few weeks, compared with normal: a bit warmer, normal rain and a slightly warmer sea.

Next 6 weeks

When	TemperatureTemp.	Rain	Sea	Typical high / low
Nov 2 – Nov 8Nov 2–Nov 8	Above +3.4 °F	Normal	Normal +0.2 °F	—
Nov 9 – Nov 15Nov 9–Nov 15	A bit above +1.3 °F	Normal	A bit above +0.5 °F	47° / 42°
Nov 16 – Nov 22Nov 16–Nov 22	A bit above +2.2 °F	A bit below −25%	A bit above +0.7 °F	46° / 41°
Nov 23 – Nov 29Nov 23–Nov 29	A bit above +2.5 °F	A bit above +28%	A bit above +0.9 °F	44° / 40°
Nov 30 – Dec 6Nov 30–Dec 6	A bit above +2.3 °F	A bit above +24%	A bit above +0.9 °F	42° / 37°

Coming months

When	TemperatureTemp.	Rain	Sea
November	A bit above +1.4 °F	Normal	A bit above +0.9 °F
December	Above +3.8 °F	Normal	Above +2.0 °F
January	Above +5.0 °F	A bit above +35%	Above +3.1 °F
February	Above +4.1 °F	A bit above +21%	Above +3.4 °F
March	Above +3.8 °F	Normal	Above +3.1 °F

Weeks: ECMWF 46-day (average of its scenarios), against the normal of the last 20 years for those dates. Months: ECMWF SEAS5. Rain: total against normal. The further ahead, the closer it gets to normal and the less detail it can give.

Islesboro climate by monthClimate by month

Normal weather for each month (1991–2020 averages)

The best time to visit Islesboro is from June to August: highs of 71 °F to 77 °F, about 9 rainy days a month and 7 hours of sunshine a day.

Tropical cyclones rarely pass near Islesboro: one within 93 mi in the last 30 years (1996–2025), Bertha, in July 1996.

33° 15°

JanJ
35° 16°

FebF
41° 24°

MarM
50° 34°

AprA
62° 43°

MayM
71° 51°

JunJ
77° 58°

JulJ
76° 58°

AugA
68° 51°

SepS
58° 42°

OctO
47° 33°

NovN
38° 23°

DecD

Highs and lows
Monthly rainfall
Best time

Month	High	Low	Rain	Rainy daysDays	Sun (h/day)	Water	Waves
JanuaryJan	33°	15°	3.69 in	8	3.9	39°	2.8 ft
FebruaryFeb	35°	16°	3.50 in	7	5.2	35°	2.6 ft
MarchMar	41°	24°	3.91 in	9	6.0	35°	2.4 ft
AprilApr	50°	34°	4.77 in	9	6.3	40°	2.2 ft
MayMay	62°	43°	4.35 in	10	6.3	46°	1.7 ft
JuneJun	71°	51°	3.74 in	10	7.1	52°	1.6 ft
JulyJul	77°	58°	2.89 in	9	7.5	57°	1.4 ft
AugustAug	76°	58°	2.90 in	8	7.5	58°	1.4 ft
SeptemberSep	68°	51°	3.72 in	8	6.2	57°	1.6 ft
OctoberOct	58°	42°	5.52 in	9	4.1	54°	2.1 ft
NovemberNov	47°	33°	5.33 in	9	3.1	49°	2.5 ft
DecemberDec	38°	23°	5.53 in	10	2.9	44°	2.6 ft

Month	Water	Waves
Jan	39°	2.8 ft
Feb	35°	2.6 ft
Mar	35°	2.4 ft
Apr	40°	2.2 ft
May	46°	1.7 ft
Jun	52°	1.6 ft
Jul	57°	1.4 ft
Aug	58°	1.4 ft
Sep	57°	1.6 ft
Oct	54°	2.1 ft
Nov	49°	2.5 ft
Dec	44°	2.6 ft

Days: rainy days in the month. Sun: hours a day.

A normal year brings 49.85 in of rain on about 105 days and about 2,000 hours of sunshine.

1991–2020 averages. Highs, lows and rainfall: TerraClimate; rainy days (0.04 in or more): NASA POWER (MERRA-2); sunshine hours: estimated from solar radiation; water: NOAA OISST; waves (average height): ERA5, 2011–2020. Normals are not a forecast: any given year can turn out very different. Sources and licenses

Temperature

Now44 °Ffeels like 38 °F

Tomorrow44 / 60 °F

It's 44 °F now (feels like 38 °F). Today, 33 °F to 49 °F; tomorrow, 44 °F to 60 °F.

Chance of rain

Today 1%
Thu 29 8%
Fri 30 22%
Sat 31 0%
Sun 1 0%
Mon 2 6%
Tue 3 11%

Today the chance of rain reaches 1%. The next day with likely rain is Wednesday 4: 21% and 0.06 in.

No rain in the last 7 days.

Humidity and dew point

Humidity72%

Dew point36 °F

Humidity is 72% now and the dew point is 36 °F.

The dew point is the temperature at which the air becomes saturated: the higher it is, the heavier the air feels.

Visibility and fog

Now13 migood

Clouds19%

Visibility is good now (13 mi). No fog expected today.

UV index

Now0

Today's peak3low

Thu 29: 3 · Fri 30: 2 · Sat 31: 2

Index	Level	What to do
0–2	low	No special protection needed.
3–5	moderate	Hat, sunglasses and sunscreen around midday.
6–7	high	Sunscreen, hat and shade between 12 and 4 pm.
8–10	very high	Avoid the midday sun; reflection off the water adds to it.
11+	extreme	Avoid the sun between 11 am and 5 pm; protect yourself even if it is cloudy.

Reflection off water and sand adds radiation: protect yourself more on a boat or at the beach.

Barometric pressure

↗ Rising Anglers say fish bite less for a while
→ Steady Anglers expect normal activity
↘ Falling · now Anglers say fish feed more before the change

30.0030.50 29.83

Falling now (−0.05 inHg in 3 hours). Over the next 48 hours: −0.21 inHg. Falling pressure: anglers say fish feed more before the change. Fast changes, either way, tend to affect fishing.

Air and pollen

Air qualityGood · 30

Saharan dustNo

Previous days

The weather over the last 30 days, as the models analyzed it. Tap a day to see it hour by hour.

Day	Sky	Low / high	Max wind
Tue 27	Mainly clear	36 / 50 °F	11 mph NNW
Mon 26	Overcast	40 / 65 °F	12 mph WNW
Sun 25	Clear sky	36 / 65 °F	8 mph W
Sat 24	Clear sky	33 / 57 °F	7 mph NW
Fri 23	Clear sky	38 / 52 °F	14 mph N
Thu 22	Overcast	40 / 57 °F	14 mph N
Wed 21	Overcast	37 / 56 °F	10 mph NNE

Show all 30 days

Day	Sky	Low / high	Rain	Max wind
Tue 20	Clear sky	37 / 62 °F	0	11 mph N
Mon 19	Mainly clear	38 / 57 °F	0	9 mph SSW
Sun 18	Clear sky	31 / 55 °F	0	8 mph WSW
Sat 17	Overcast	35 / 54 °F	0	15 mph NW
Fri 16	Rain	38 / 58 °F	0.63 in	14 mph S
Thu 15	Overcast	42 / 57 °F	0	13 mph NW
Wed 14	Heavy drizzle	49 / 64 °F	0.33 in	13 mph NW
Tue 13	Rain	41 / 49 °F	0.92 in	11 mph ENE
Mon 12	Drizzle	48 / 68 °F	0.14 in	13 mph NNW
Sun 11	Light drizzle	39 / 58 °F	0.01 in	10 mph SSW
Sat 10	Overcast	43 / 58 °F	0	13 mph WNW
Fri 9	Overcast	46 / 62 °F	0	14 mph W
Thu 8	Rain	51 / 65 °F	0.50 in	10 mph SW
Wed 7	Light drizzle	38 / 59 °F	0.01 in	10 mph SW
Tue 6	Partly cloudy	46 / 56 °F	0	18 mph WNW
Mon 5	Light drizzle	49 / 63 °F	0.05 in	15 mph W
Sun 4	Light drizzle	42 / 61 °F	0.01 in	8 mph ESE
Sat 3	Overcast	48 / 65 °F	0	9 mph NNW
Fri 2	Drizzle	55 / 78 °F	0.15 in	13 mph W
Thu 1	Overcast	54 / 71 °F	0	9 mph SSW
Wed 30	Overcast	55 / 65 °F	0	7 mph NW
Tue 29	Light rain	55 / 59 °F	0.48 in	10 mph NNE
Mon 28	Rain	53 / 56 °F	1.32 in	11 mph NE

These are the models at the start of each day (ECMWF and GFS; waves from Météo-France), not readings from a weather station: there can be differences at specific spots.

Questions about the weather in IslesboroQuestions

What's the weather like today in Islesboro?

Partly cloudy, from 33 °F to 49 °F, with a gentle breeze from the southwest (8 mph) and a 1% chance of rain.

Will it rain tomorrow in Islesboro?

On Thursday 29 the chance of rain is 8% (0.00 in): mainly clear.

How warm will it be this week?

Between a low of 33 °F and a high of 62 °F; the warmest day, Friday 30.

What's the UV index today?

It reaches 3 (low). No special protection needed.

Is the pressure rising or falling?

It's 30.28 inHg and falling: −0.16 inHg over the last 24 hours.

When is the best time to visit Islesboro?

The best time to visit Islesboro is from June to August: highs of 71 °F to 77 °F, about 9 rainy days a month and 7 hours of sunshine a day.

What is the weather like in Islesboro in October?

In October, Islesboro normally sees highs of 58 °F and lows of 42 °F, with about 9 rainy days (5.52 in for the month) and 4 hours of sunshine a day. The sea is around 54 °F. These are 1991–2020 averages.

What are the warmest and wettest months in Islesboro?

The warmest is July, with average highs of 77 °F, and the coldest January, with lows of 15 °F. The wettest is December (5.53 in) and the driest, July.

More about Islesboro today

Weather near Islesboro

Only places with a different forecast: spots a few miles apart share the same model cell and wouldn't add anything.

Learn more

Weather: Open-Meteo, CC BY 4.0, with the best model for each spot and lead time (NOAA HRRR and NBM in the U.S., Météo-France AROME, DWD ICON-EU, ECMWF IFS and NOAA GFS); ECMWF grid point 14 mi away. The comparison also uses ICON (DWD), AIFS (ECMWF) and ARPEGE (Météo-France). Outlook: ECMWF 46-day and SEAS5. Chance of rain from ensemble models (ECMWF, GEFS and NBM). UV, air quality and pollen: CAMS (Copernicus).

Forecast from Open-Meteo (CC BY 4.0) with models from ECMWF, NOAA, Météo-France, DWD, Copernicus Marine and CAMS. Updated at 12:00 am (local time).

Spotted a mistake? Tell us · Where the weather and sea data come from