South Portland · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
South Portland & neighbors — hit play
Every city on the map carries real forecast data from the same models as its city page, refreshed several times a day. The icon is the day's overall look; the number is the afternoon high.
Next 14 days at a glance
from the model forecast
Hottest day
26°
Fri, Sep 11
Coldest night
12°
Sun, Sep 13
Days with precip
6 / 14
of 14 forecast days
Nicest day
Thu, Sep 10
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 5 – Sun 6 Sep
20° 14°
68% precip chance
Sat 12 – Sun 13 Sep
22° 12°
57% precip chance
Sat 19 – Sun 20 Sep
15° 9°
typical range
Sat 26 – Sun 27 Sep
15° 9°
typical range
30 days — South Portland
14 forecast + 16 climatology
Mon · Today Sunny
24°15°10%⌄
Wind12 mph SE
Gusts20 mph
UV index7 – High
Precip chance10%
Sunrise06:03
Sunset19:18
Tue · Tomorrow Showers
19°17°5.8 mm⌄
Wind12 mph NE
Gusts15 mph
UV index1 – Low
Precip chance89%
Sunrise06:04
Sunset19:17
Wednesday 2/9 Mostly cloudy
19°18°0.7 mm⌄
Wind15 mph SE
Gusts21 mph
UV index3 – Moderate
Precip chance63%
Sunrise06:05
Sunset19:15
Thursday 3/9 Showers
21°16°7.0 mm⌄
Wind15 mph S
Gusts26 mph
UV index3 – Moderate
Precip chance87%
Sunrise06:07
Sunset19:13
Friday 4/9 Sunny
22°15°16%⌄
Wind11 mph N
Gusts21 mph
UV index6 – High
Precip chance16%
Sunrise06:08
Sunset19:11
Saturday 5/9 Showers
20°15°1.7 mm⌄
Wind17 mph N
Gusts29 mph
UV index5 – Moderate
Precip chance66%
Sunrise06:09
Sunset19:10
Sunday 6/9 Showers
17°14°1.5 mm⌄
Wind20 mph N
Gusts31 mph
UV index4 – Moderate
Precip chance68%
Sunrise06:10
Sunset19:08
Monday 7/9 Mostly cloudy
18°15°18%⌄
Wind15 mph N
Gusts23 mph
UV index5 – Moderate
Precip chance18%
Sunrise06:11
Sunset19:06
Tuesday 8/9 Sunny
18°14°8%⌄
Wind11 mph SE
Gusts17 mph
UV index5 – Moderate
Precip chance8%
Sunrise06:12
Sunset19:04
Wednesday 9/9 Sunny
20°15°9%⌄
Wind15 mph S
Gusts27 mph
UV index5 – Moderate
Precip chance9%
Sunrise06:13
Sunset19:02
Thursday 10/9 Sunny
22°16°9%⌄
Wind12 mph SW
Gusts24 mph
UV index6 – High
Precip chance9%
Sunrise06:14
Sunset19:01
Friday 11/9 Sunny
26°20°10%⌄
Wind13 mph SW
Gusts22 mph
UV index7 – High
Precip chance10%
Sunrise06:15
Sunset18:59
Saturday 12/9 Sunny
22°14°1.5 mm⌄
Wind22 mph NE
Gusts32 mph
UV index5 – Moderate
Precip chance57%
Sunrise06:17
Sunset18:57
Sunday 13/9 Sunny
16°12°6%⌄
Wind19 mph SW
Gusts24 mph
UV index5 – Moderate
Precip chance6%
Sunrise06:18
Sunset18:55
Monday 14/9 Rain (climatological)
16°11°4.8 mm⌄
Day≈13–19°
Night≈8–14°
Precip≈1.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Partly cloudy (climatological)
17°12°20%⌄
Day≈14–20°
Night≈9–15°
Precip≈1.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Partly cloudy (climatological)
17°12°20%⌄
Day≈14–20°
Night≈9–15°
Precip≈1.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Rain (climatological)
17°12°3.3 mm⌄
Day≈14–20°
Night≈9–15°
Precip≈1.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
14°10°20%⌄
Day≈11–17°
Night≈7–13°
Precip≈1.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
12°9°20%⌄
Day≈9–15°
Night≈6–12°
Precip≈1.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Rain (climatological)
15°11°4.3 mm⌄
Day≈12–18°
Night≈8–14°
Precip≈1.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Partly cloudy (climatological)
15°11°20%⌄
Day≈12–18°
Night≈8–14°
Precip≈1.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Partly cloudy (climatological)
17°12°20%⌄
Day≈14–20°
Night≈9–15°
Precip≈1.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Rain (climatological)
19°13°3.3 mm⌄
Day≈16–22°
Night≈10–16°
Precip≈1.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Partly cloudy (climatological)
17°12°20%⌄
Day≈14–20°
Night≈9–15°
Precip≈1.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 25/9 Partly cloudy (climatological)
14°10°20%⌄
Day≈11–17°
Night≈7–13°
Precip≈1.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 26/9 Rain (climatological)
12°9°3.2 mm⌄
Day≈9–15°
Night≈6–12°
Precip≈1.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 27/9 Partly cloudy (climatological)
15°11°20%⌄
Day≈12–18°
Night≈8–14°
Precip≈1.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 28/9 Partly cloudy (climatological)
16°11°20%⌄
Day≈13–19°
Night≈8–14°
Precip≈1.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 29/9 Rain (climatological)
17°12°2.1 mm⌄
Day≈14–20°
Night≈9–15°
Precip≈1.6 in / September
(climatological)Typical range for these dates · 1991–2020
How does a 30-day outlook work?
The first 14 days are a live model forecast. The back half of the month shows the typical range for those dates — useful for planning, not a literal prediction.
First 14 days: a real forecast, blended from NBM, ECMWF and GFS runs. Trust it most inside three days; by the second week treat it as a lean, not a promise.
Rest of the month: past day 14 we stop pretending to forecast and switch to the climate corridor — the range those dates have produced over three decades computed directly for South Portland, with mild week-to-week wiggle.
Good question for this page: "Is late August usually humid in Chicago?" Bad question: "Do I need an umbrella on the 29th?" — three weeks out no one knows, and that's the honest answer.