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
95°
Sat, Aug 29
Coldest night
61°
Wed, Aug 26
Days with precip
2 / 14
of 14 forecast days
Nicest day
Wed, Aug 26
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 22 – Sun 23 Aug
90° 63°
36% precip chance
Sat 29 – Sun 30 Aug
95° 61°
77% precip chance
Sat 5 – Sun 6 Sep
79° 56°
typical range
Sat 12 – Sun 13 Sep
79° 56°
typical range
30 days — Groton
14 forecast + 16 climatology
Wed · Today Sunny
86°62°0.6 mm⌄
Wind16 mph W
Gusts23 mph
UV index7 – High
Precip chance36%
Sunrise06:38
Sunset20:33
Thu · Tomorrow Sunny
93°66°5%⌄
Wind15 mph NW
Gusts21 mph
UV index6 – High
Precip chance5%
Sunrise06:39
Sunset20:32
Friday 21/8 Sunny
89°66°1%⌄
Wind13 mph N
Gusts22 mph
UV index7 – High
Precip chance1%
Sunrise06:40
Sunset20:30
Saturday 22/8 Sunny
90°66°4%⌄
Wind13 mph E
Gusts29 mph
UV index8 – High
Precip chance4%
Sunrise06:41
Sunset20:28
Sunday 23/8 Mostly cloudy
87°63°0.3 mm⌄
Wind14 mph S
Gusts31 mph
UV index8 – Very high
Precip chance36%
Sunrise06:43
Sunset20:26
Monday 24/8 Sunny
94°69°1%⌄
Wind17 mph NW
Gusts32 mph
UV index8 – Very high
Precip chance1%
Sunrise06:44
Sunset20:25
Tuesday 25/8 Sunny
86°65°2%⌄
Wind14 mph N
Gusts24 mph
UV index7 – High
Precip chance2%
Sunrise06:45
Sunset20:23
Wednesday 26/8 Sunny
84°61°1%⌄
Wind11 mph SE
Gusts25 mph
UV index7 – High
Precip chance1%
Sunrise06:46
Sunset20:21
Thursday 27/8 Mostly cloudy
86°64°5%⌄
Wind14 mph S
Gusts28 mph
UV index7 – High
Precip chance5%
Sunrise06:47
Sunset20:19
Friday 28/8 Sunny
92°66°2%⌄
Wind17 mph S
Gusts34 mph
UV index8 – Very high
Precip chance2%
Sunrise06:49
Sunset20:18
Saturday 29/8 Partly cloudy
95°69°4%⌄
Wind14 mph S
Gusts31 mph
UV index8 – Very high
Precip chance4%
Sunrise06:50
Sunset20:16
Sunday 30/8 Showers
75°61°3.1 mm⌄
Wind10 mph NE
Gusts22 mph
UV index5 – Moderate
Precip chance77%
Sunrise06:51
Sunset20:14
Monday 31/8 Sunny
89°66°17%⌄
Wind15 mph SE
Gusts31 mph
UV index8 – Very high
Precip chance17%
Sunrise06:52
Sunset20:12
Tuesday 1/9 Thunderstorms
83°69°3.6 mm⌄
Wind22 mph S
Gusts38 mph
UV index7 – High
Precip chance65%
Sunrise06:54
Sunset20:10
Wednesday 2/9 Rain (climatological)
76°55°2.2 mm⌄
Day≈71–82°
Night≈50–61°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 3/9 Partly cloudy (climatological)
82°59°20%⌄
Day≈77–87°
Night≈53–64°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 4/9 Partly cloudy (climatological)
81°58°20%⌄
Day≈75–86°
Night≈53–64°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 5/9 Light rain (climatological)
79°57°1.4 mm⌄
Day≈73–84°
Night≈51–62°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 6/9 Partly cloudy (climatological)
76°56°20%⌄
Day≈71–82°
Night≈50–61°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 7/9 Partly cloudy (climatological)
77°56°20%⌄
Day≈71–82°
Night≈50–61°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 8/9 Light rain (climatological)
78°56°1.1 mm⌄
Day≈72–83°
Night≈51–62°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 9/9 Partly cloudy (climatological)
81°58°20%⌄
Day≈76–86°
Night≈53–64°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 10/9 Partly cloudy (climatological)
80°58°20%⌄
Day≈74–85°
Night≈52–63°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Light rain (climatological)
82°59°1.8 mm⌄
Day≈77–88°
Night≈54–64°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Partly cloudy (climatological)
79°57°20%⌄
Day≈74–84°
Night≈52–62°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Partly cloudy (climatological)
77°56°20%⌄
Day≈71–82°
Night≈50–61°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Light rain (climatological)
73°54°1.2 mm⌄
Day≈68–79°
Night≈48–59°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Partly cloudy (climatological)
74°54°20%⌄
Day≈69–79°
Night≈49–60°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Partly cloudy (climatological)
80°58°20%⌄
Day≈75–86°
Night≈52–63°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Light rain (climatological)
84°60°1.7 mm⌄
Day≈79–89°
Night≈55–65°
Precip≈0.7 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.