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
82°
Sun, Aug 30
Coldest night
46°
Sun, Sep 6
Days with precip
8 / 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
82° 52°
10% precip chance
Sat 5 – Sun 6 Sep
55° 46°
89% precip chance
Sat 12 – Sun 13 Sep
57° 43°
typical range
Sat 19 – Sun 20 Sep
59° 44°
typical range
30 days — Groton
14 forecast + 16 climatology
Tue · Today Light rain
73°55°13.3 mm⌄
Wind14 mph NW
Gusts24 mph
UV index4 – Moderate
Precip chance86%
Sunrise06:23
Sunset19:52
Wed · Tomorrow Mostly cloudy
74°56°15%⌄
Wind7 mph SE
Gusts15 mph
UV index7 – High
Precip chance15%
Sunrise06:24
Sunset19:50
Thursday 27/8 Mostly cloudy
79°61°6.1 mm⌄
Wind13 mph S
Gusts24 mph
UV index6 – High
Precip chance77%
Sunrise06:25
Sunset19:48
Friday 28/8 Sunny
74°57°1.9 mm⌄
Wind6 mph N
Gusts13 mph
UV index6 – High
Precip chance57%
Sunrise06:26
Sunset19:47
Saturday 29/8 Sunny
72°52°9%⌄
Wind5 mph NW
Gusts14 mph
UV index6 – High
Precip chance9%
Sunrise06:27
Sunset19:45
Sunday 30/8 Mostly cloudy
82°55°10%⌄
Wind13 mph SW
Gusts19 mph
UV index7 – High
Precip chance10%
Sunrise06:28
Sunset19:43
Monday 31/8 Fog
71°60°0.8 mm⌄
Wind9 mph NW
Gusts16 mph
UV index5 – Moderate
Precip chance62%
Sunrise06:29
Sunset19:42
Tuesday 1/9 Showers
74°60°27.9 mm⌄
Wind13 mph S
Gusts27 mph
UV index5 – Moderate
Precip chance92%
Sunrise06:30
Sunset19:40
Wednesday 2/9 Fog
66°52°1.5 mm⌄
Wind9 mph NW
Gusts20 mph
UV index3 – Moderate
Precip chance78%
Sunrise06:31
Sunset19:38
Thursday 3/9 Fog
58°48°0.1 mm⌄
Wind6 mph NW
Gusts14 mph
UV index3 – Moderate
Precip chance43%
Sunrise06:32
Sunset19:37
Friday 4/9 Showers
59°49°0.5 mm⌄
Wind8 mph NW
Gusts15 mph
UV index4 – Moderate
Precip chance59%
Sunrise06:33
Sunset19:35
Saturday 5/9 Showers
55°49°5.0 mm⌄
Wind10 mph NW
Gusts21 mph
UV index3 – Moderate
Precip chance89%
Sunrise06:34
Sunset19:33
Sunday 6/9 Fog
55°46°0.7 mm⌄
Wind11 mph N
Gusts18 mph
UV index3 – Moderate
Precip chance63%
Sunrise06:35
Sunset19:31
Monday 7/9 Mostly cloudy
53°46°25%⌄
Wind11 mph N
Gusts23 mph
UV index3 – Moderate
Precip chance25%
Sunrise06:36
Sunset19:30
Tuesday 8/9 Rain (climatological)
58°45°13.4 mm⌄
Day≈52–63°
Night≈40–51°
Precip≈5.0 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 9/9 Partly cloudy (climatological)
64°49°20%⌄
Day≈58–69°
Night≈43–54°
Precip≈5.0 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 10/9 Partly cloudy (climatological)
62°48°20%⌄
Day≈57–68°
Night≈43–53°
Precip≈5.0 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Rain (climatological)
62°48°10.9 mm⌄
Day≈57–68°
Night≈43–53°
Precip≈5.0 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Partly cloudy (climatological)
57°45°20%⌄
Day≈51–62°
Night≈39–50°
Precip≈5.0 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Partly cloudy (climatological)
53°43°20%⌄
Day≈48–59°
Night≈37–48°
Precip≈5.0 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Rain (climatological)
56°44°6.7 mm⌄
Day≈51–62°
Night≈39–50°
Precip≈5.0 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Partly cloudy (climatological)
58°46°20%⌄
Day≈53–64°
Night≈40–51°
Precip≈5.0 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Partly cloudy (climatological)
62°48°20%⌄
Day≈57–68°
Night≈43–53°
Precip≈5.0 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Rain (climatological)
63°48°6.3 mm⌄
Day≈58–69°
Night≈43–54°
Precip≈5.0 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
63°48°20%⌄
Day≈58–69°
Night≈43–54°
Precip≈5.0 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
59°46°20%⌄
Day≈54–64°
Night≈40–51°
Precip≈5.0 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Rain (climatological)
55°44°15.1 mm⌄
Day≈50–61°
Night≈38–49°
Precip≈5.0 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Partly cloudy (climatological)
56°44°20%⌄
Day≈51–62°
Night≈39–50°
Precip≈5.0 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Partly cloudy (climatological)
62°47°20%⌄
Day≈56–67°
Night≈42–53°
Precip≈5.0 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Rain (climatological)
62°47°16.0 mm⌄
Day≈56–67°
Night≈42–53°
Precip≈5.0 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.