Weather in South Portland

14-day forecast · updated today, Thursday, October 29, at 4:48 am (EDT)

Now · clear 41 °F

Feels like: 34 °F
Low / high: 41 / 66 °F
Rain: 6%
Wind: 9 mph SW

→ 30.23 inHg · steady

Today in South Portland: mainly clear, 41 °F to 66 °F, with a 6% chance of rain and a gentle breeze from the southwest (9 mph). Tomorrow, heavy drizzle, 46 °F to 66 °F and a 26% chance of rain. The warmest day of the week is Thursday 29, at 66 °F. Next likely rain: Wednesday 4 (23%).

Measured now at the airport

Portland (KPWM), 3.2 mi away · 57 min ago

Visibility9.9 mi or more

WeatherNothing to note

Temperature43 °F

Wind3 mph from the south

It's what the airport's weather station measured, not a forecast: on the coast, wind and fog can be different. Airports report every 30 or 60 minutes.

Airport METAR report, via NOAA's Aviation Weather Center (aviationweather.gov). Sources and licenses

Temperatures for the next 14 days

66° 41°
Today
66° 46°
Fri 30
51° 36°
Sat 31
56° 31°
Sun 1
63° 39°
Mon 2
56° 42°
Tue 3
58° 43°
Wed 4
59° 45°
Thu 5
59° 47°
Fri 6
55° 43°
Sat 7
55° 39°
Sun 8
58° 45°
Mon 9
58° 49°
Tue 10
52° 48°
Wed 11

Day by day

Day	Sky	Low / high	Rain	Max wind	Max wave	High tides	Model
Today · 29	Mainly clear	41 / 66 °F	6%	13 mph SW	2.7 ft	1:36 am · 1:44 pm	HRRR + NBM
Fri 30	Heavy drizzle	46 / 66 °F	26% · 0.02 in	13 mph W	2.6 ft	2:29 am · 2:39 pm	NBM
Sat 31	Clear sky	36 / 51 °F	0%	11 mph NW	1.4 ft	3:28 am · 3:40 pm	NBM
Sun 1	Clear sky	31 / 56 °F	0%	7 mph WSW	0.9 ft	3:33 am · 3:47 pm	NBM
Mon 2	Light drizzle	39 / 63 °F	3%	7 mph WSW	1.1 ft	4:40 am · 4:57 pm	NBM
Tue 3	Light drizzle	42 / 56 °F	11%	8 mph E	2.0 ft	5:46 am · 6:06 pm	NBM
Wed 4	Light drizzle	43 / 58 °F	23% · 0.18 in	10 mph S	3.2 ft	6:49 am · 7:12 pm	NBM
Thu 5	Overcast	45 / 59 °F	31% · 0.48 in	11 mph SE	2.2 ft	7:45 am · 8:11 pm	NBM
Fri 6	Light drizzle	47 / 59 °F	42% · 0.82 in	11 mph SSE	6.4 ft	8:35 am · 9:04 pm	NBM
Sat 7	Rain	43 / 55 °F	32% · 0.69 in	9 mph NNW	10 ft	9:20 am · 9:52 pm	NBM
Sun 8	Heavy drizzle	39 / 55 °F	20% · 0.08 in	11 mph NW	8.5 ft	10:02 am · 10:37 pm	NBM + ECMWF
Mon 9	Overcast	45 / 58 °F	18%	11 mph WSW	4.1 ft	10:41 am · 11:19 pm	ECMWF
Tue 10	Overcast	49 / 58 °F	16%	7 mph WSW	2.0 ft	11:19 am · 11:59 pm	ECMWF
Wed 11	Light drizzle	48 / 52 °F	16% · 0.11 in	8 mph NNE	2.1 ft	11:57 am	ECMWF

Each hour comes from the best model for this spot: HRRR until Thursday 29 11:00 pm; then NBM until Sunday 8 8:00 pm; then ECMWF until Thursday 12 10:00 pm; 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	Clear sky	Clear sky	Clear sky	Clear	Clear
Temperature	42°	41°	41°	46°	62°	66°	60°	57°
Chance of rain	1%	1%	0%	0%	0%	0%	1%	2%
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)	7 SW	7 SW	9 SW	10 SW	10 SW	10 SSW	10 SW	13 SW
Humidity	84%	83%	75%	74%	53%	53%	56%	69%
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 tomorrow: 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	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	63°	60°	48°	53°	63°	51°	49°
AIFS	60°	60°	49°	52°	60°	62°	65°
GFS	68°	66°	52°	57°	68°	55°	55°
ICON	68°	65°	50°	56°	67°	56°	60°
HRRR	66°	62°	—	—	—	—	—
NBM	65°	66°	51°	56°	63°	56°	58°
Confidence	high	medium	high	high	medium	high	low

Do the models agree? · Rain
Rain	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	0	0.14 in	0	0	0.03 in	0.01 in	0.05 in
AIFS	0	0	0	0	0	0	0
GFS	0	0.06 in	0	0	0	0	0
ICON	0	0.02 in	0	0	0.02 in	0	0
HRRR	0	0	—	—	—	—	—
NBM	0	0.02 in	0	0	0	0	0.17 in
Confidence	high	medium	high	high	high	high	medium

Do the models agree? · Wind
Wind (mph)	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	1221	1326	1427	717	1215	815	718
AIFS	15	14	15	9	10	9	9
GFS	1132	1432	1530	615	923	911	714
ICON	921	1330	1227	614	820	617	819
HRRR	1322	1835	—	—	—	—	—
NBM	1219	1320	1117	79	711	811	1014
Confidence	high	high	high	high	high	high	high

Chance of rain from the ensemble models

Model	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF (51 scenarios)	0%	53%	0%	0%	2%	20%	24%
GFS (GEFS, 31 scenarios)	0%	68%	0%	0%	1%	26%	29%
NBM (NOAA)	6%	26%	0%	0%	3%	11%	23%
Thunderstorm (NBM)	0%	1%	0%	0%	0%	0%	1%

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 and normal rain.

Next 6 weeks

When	TemperatureTemp.	Rain	Typical high / low
Nov 2 – Nov 8Nov 2–Nov 8	Above +4.7 °F	Normal	—
Nov 9 – Nov 15Nov 9–Nov 15	A bit above +1.1 °F	Normal	—
Nov 16 – Nov 22Nov 16–Nov 22	A bit above +2.2 °F	Normal	48° / 38°
Nov 23 – Nov 29Nov 23–Nov 29	Above +2.7 °F	A bit above +34%	45° / 37°
Nov 30 – Dec 6Nov 30–Dec 6	A bit above +2.3 °F	A bit above +33%	43° / 34°

Coming months

When	TemperatureTemp.	Rain
November	A bit above +1.4 °F	Normal
December	Above +3.8 °F	A bit above +27%
January	Above +5.2 °F	A bit above +47%
February	Above +3.8 °F	A bit above +38%
March	Above +4.0 °F	A bit above +24%

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. The long-range sea temperature isn't usable at this spot (the model's grid cell falls on land).

South Portland climate by monthClimate by month

Normal weather for each month (1991–2020 averages)

The best time to visit South Portland is from June to September: highs of 72 °F to 80 °F, about 9 rainy days a month and 7 hours of sunshine a day.

Tropical cyclones rarely pass near South Portland: 2 within 93 mi in the last 30 years (1996–2025), most recently Floyd, in September 1999.

32° 14°

JanJ
36° 16°

FebF
43° 25°

MarM
55° 35°

AprA
66° 45°

MayM
75° 54°

JunJ
80° 60°

JulJ
79° 59°

AugA
72° 51°

SepS
60° 40°

OctO
48° 31°

NovN
38° 22°

DecD

Highs and lows
Monthly rainfall
Best time

Month	High	Low	Rain	Rainy daysDays	Sun (h/day)	Water	Waves
JanuaryJan	32°	14°	3.60 in	8	3.7	42°	4.7 ft
FebruaryFeb	36°	16°	3.33 in	8	5.0	39°	4.5 ft
MarchMar	43°	25°	4.25 in	9	5.7	38°	4.4 ft
AprilApr	55°	35°	4.57 in	9	6.4	41°	4.1 ft
MayMay	66°	45°	3.73 in	10	6.5	48°	3.1 ft
JuneJun	75°	54°	3.61 in	10	7.1	55°	2.8 ft
JulyJul	80°	60°	3.14 in	11	7.6	62°	2.6 ft
AugustAug	79°	59°	3.11 in	9	7.5	63°	2.6 ft
SeptemberSep	72°	51°	3.31 in	8	6.2	60°	3.4 ft
OctoberOct	60°	40°	5.22 in	9	4.1	54°	4.0 ft
NovemberNov	48°	31°	4.21 in	8	3.2	49°	4.2 ft
DecemberDec	38°	22°	4.65 in	10	2.9	45°	4.4 ft

Month	Water	Waves
Jan	42°	4.7 ft
Feb	39°	4.5 ft
Mar	38°	4.4 ft
Apr	41°	4.1 ft
May	48°	3.1 ft
Jun	55°	2.8 ft
Jul	62°	2.6 ft
Aug	63°	2.6 ft
Sep	60°	3.4 ft
Oct	54°	4.0 ft
Nov	49°	4.2 ft
Dec	45°	4.4 ft

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

A normal year brings 46.73 in of rain on about 107 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

Now41 °Ffeels like 34 °F

Tomorrow46 / 66 °F

It's 41 °F now (feels like 34 °F). Today, 41 °F to 66 °F; tomorrow, 46 °F to 66 °F.

Chance of rain

Today 6%
Fri 30 26% 0.02 in
Sat 31 0%
Sun 1 0%
Mon 2 3%
Tue 3 11%
Wed 4 23% 0.18 in

Today the chance of rain reaches 6%. The next day with likely rain is Wednesday 4: 23% and 0.18 in.

Recent rain: last 24 hours, 0.00 in; last 3 days, 0.07 in; last 7 days, 0.07 in.

Humidity and dew point

Humidity78%

Dew point34 °F

Humidity is 78% now and the dew point is 34 °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

Now12 migood

Clouds2%

Visibility is good now (12 mi). No fog expected today.

UV index

Now0

Today's peak3low

Fri 30: 2 · Sat 31: 2 · Sun 1: 3

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 · now Anglers expect normal activity
↘ Falling Anglers say fish feed more before the change

29.8030.0030.2030.40 29.86

Steady now (−0.02 inHg in 3 hours). It barely changes over the next 48 hours. Steady pressure: anglers expect normal activity. Fast changes, either way, tend to affect fishing.

Air and pollen

Air qualityGood · 31

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	Rain	Max wind
Wed 28	Overcast	32 / 47 °F	0	9 mph WSW
Tue 27	Overcast	39 / 51 °F	0	11 mph NNW
Mon 26	Drizzle	39 / 63 °F	0.07 in	12 mph NW
Sun 25	Mainly clear	37 / 59 °F	0	7 mph WSW
Sat 24	Mainly clear	35 / 57 °F	0	7 mph WNW
Fri 23	Clear sky	40 / 54 °F	0	13 mph N
Thu 22	Overcast	43 / 61 °F	0	14 mph N

Show all 30 days

Day	Sky	Low / high	Rain	Max wind
Wed 21	Overcast	41 / 56 °F	0	12 mph NNE
Tue 20	Mainly clear	40 / 63 °F	0	12 mph N
Mon 19	Clear sky	38 / 56 °F	0	8 mph SSW
Sun 18	Clear sky	34 / 52 °F	0	9 mph SW
Sat 17	Overcast	38 / 57 °F	0	15 mph NW
Fri 16	Light drizzle	43 / 61 °F	0.18 in	14 mph SSW
Thu 15	Overcast	45 / 58 °F	0	13 mph NW
Wed 14	Drizzle	49 / 66 °F	0.12 in	10 mph NW
Tue 13	Light rain	45 / 56 °F	0.67 in	13 mph E
Mon 12	Drizzle	49 / 68 °F	0.15 in	14 mph N
Sun 11	Heavy drizzle	41 / 56 °F	0.14 in	9 mph SSW
Sat 10	Overcast	45 / 58 °F	0	10 mph NW
Fri 9	Partly cloudy	49 / 63 °F	0	14 mph W
Thu 8	Drizzle	50 / 67 °F	0.12 in	11 mph SW
Wed 7	Overcast	40 / 58 °F	0	12 mph SSW
Tue 6	Mainly clear	46 / 57 °F	0	15 mph WNW
Mon 5	Overcast	51 / 66 °F	0	15 mph W
Sun 4	Overcast	45 / 59 °F	0	9 mph ENE
Sat 3	Overcast	50 / 64 °F	0	9 mph N
Fri 2	Drizzle	61 / 77 °F	0.08 in	11 mph WSW
Thu 1	Overcast	56 / 69 °F	0	11 mph SSW
Wed 30	Light drizzle	56 / 62 °F	0.01 in	6 mph SSW
Tue 29	Light rain	56 / 64 °F	0.22 in	11 mph N

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 South PortlandQuestions

What's the weather like today in South Portland?

Mainly clear, from 41 °F to 66 °F, with a gentle breeze from the southwest (9 mph) and a 6% chance of rain.

Will it rain tomorrow in South Portland?

On Friday 30 the chance of rain is 26% (0.02 in): heavy drizzle.

How warm will it be this week?

Between a low of 31 °F and a high of 66 °F; the warmest day, Thursday 29.

What's the UV index today?

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

Is the pressure rising or falling?

It's 30.23 inHg and steady: −0.25 inHg over the last 24 hours.

When is the best time to visit South Portland?

The best time to visit South Portland is from June to September: highs of 72 °F to 80 °F, about 9 rainy days a month and 7 hours of sunshine a day.

What is the weather like in South Portland in October?

In October, South Portland normally sees highs of 60 °F and lows of 40 °F, with about 9 rainy days (5.22 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 South Portland?

The warmest is July, with average highs of 80 °F, and the coldest January, with lows of 14 °F. The wettest is October (5.22 in) and the driest, August.

More about South Portland today

Weather near South Portland

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 7.5 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 4:48 am (local time).

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