Groton · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Groton & 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
80°
Thu, Aug 27
Coldest night
51°
Thu, Sep 3
Days with precip
5 / 14
of 14 forecast days
Nicest day
Sat, Aug 29
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 29 – Sun 30 Aug
78° 52°
20% precip chance
Sat 5 – Sun 6 Sep
74° 60°
23% precip chance
Sat 12 – Sun 13 Sep
60° 46°
typical range
Sat 19 – Sun 20 Sep
59° 47°
typical range
30 days — Groton
14 forecast + 16 climatology
Mon · Today Showers
69°53°0.8 mm⌄
Wind13 mph W
Gusts26 mph
UV index6 – High
Precip chance49%
Sunrise06:22
Sunset19:53
Tue · Tomorrow Drizzle
66°53°3.7 mm⌄
Wind13 mph NW
Gusts25 mph
UV index4 – Moderate
Precip chance78%
Sunrise06:23
Sunset19:52
Wednesday 26/8 Mostly cloudy
75°56°12%⌄
Wind8 mph SE
Gusts17 mph
UV index7 – High
Precip chance12%
Sunrise06:24
Sunset19:50
Thursday 27/8 Sunny
80°62°3.0 mm⌄
Wind11 mph S
Gusts25 mph
UV index6 – High
Precip chance69%
Sunrise06:25
Sunset19:48
Friday 28/8 Sunny
71°56°0.9 mm⌄
Wind13 mph NW
Gusts19 mph
UV index6 – High
Precip chance51%
Sunrise06:26
Sunset19:47
Saturday 29/8 Sunny
68°52°7%⌄
Wind5 mph NW
Gusts13 mph
UV index6 – High
Precip chance7%
Sunrise06:27
Sunset19:45
Sunday 30/8 Partly cloudy
78°58°20%⌄
Wind13 mph S
Gusts27 mph
UV index6 – High
Precip chance20%
Sunrise06:28
Sunset19:43
Monday 31/8 Showers
73°65°7.1 mm⌄
Wind13 mph NW
Gusts34 mph
UV index5 – Moderate
Precip chance89%
Sunrise06:29
Sunset19:42
Tuesday 1/9 Sunny
65°53°11%⌄
Wind10 mph N
Gusts15 mph
UV index5 – Moderate
Precip chance11%
Sunrise06:30
Sunset19:40
Wednesday 2/9 Fog
59°52°1.7 mm⌄
Wind4 mph E
Gusts12 mph
UV index3 – Moderate
Precip chance70%
Sunrise06:31
Sunset19:38
Thursday 3/9 Mostly cloudy
69°51°14%⌄
Wind5 mph SE
Gusts16 mph
UV index5 – Moderate
Precip chance14%
Sunrise06:32
Sunset19:37
Friday 4/9 Showers
71°59°5.6 mm⌄
Wind6 mph SE
Gusts14 mph
UV index5 – Moderate
Precip chance85%
Sunrise06:33
Sunset19:35
Saturday 5/9 Mostly cloudy
72°60°23%⌄
Wind6 mph E
Gusts13 mph
UV index5 – Moderate
Precip chance23%
Sunrise06:34
Sunset19:33
Sunday 6/9 Sunny
74°61°11%⌄
Wind10 mph S
Gusts14 mph
UV index6 – High
Precip chance11%
Sunrise06:35
Sunset19:31
Monday 7/9 Rain (climatological)
61°48°5.3 mm⌄
Day≈55–66°
Night≈43–54°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 8/9 Partly cloudy (climatological)
67°52°20%⌄
Day≈62–72°
Night≈47–57°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 9/9 Partly cloudy (climatological)
66°51°20%⌄
Day≈60–71°
Night≈46–57°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 10/9 Rain (climatological)
66°51°4.3 mm⌄
Day≈60–71°
Night≈46–57°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Partly cloudy (climatological)
60°48°20%⌄
Day≈55–65°
Night≈42–53°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Partly cloudy (climatological)
57°46°20%⌄
Day≈51–62°
Night≈40–51°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Rain (climatological)
60°48°2.7 mm⌄
Day≈54–65°
Night≈42–53°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Partly cloudy (climatological)
62°49°20%⌄
Day≈56–67°
Night≈44–54°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Partly cloudy (climatological)
66°51°20%⌄
Day≈60–71°
Night≈46–57°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Rain (climatological)
66°52°2.5 mm⌄
Day≈61–72°
Night≈46–57°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
66°52°20%⌄
Day≈61–72°
Night≈46–57°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
62°49°20%⌄
Day≈57–68°
Night≈44–55°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Rain (climatological)
58°47°6.0 mm⌄
Day≈53–64°
Night≈42–52°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
59°47°20%⌄
Day≈54–65°
Night≈42–53°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Partly cloudy (climatological)
65°51°20%⌄
Day≈60–70°
Night≈45–56°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Rain (climatological)
65°51°6.3 mm⌄
Day≈60–70°
Night≈45–56°
Precip≈2.0 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 Groton, 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.