Williamstown · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Williamstown & 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
87°
Sat, Sep 5
Coldest night
56°
Tue, Aug 25
Days with precip
8 / 14
of 14 forecast days
Nicest day
Tue, Aug 25
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 29 – Sun 30 Aug
82° 60°
19% precip chance
Sat 5 – Sun 6 Sep
87° 67°
83% precip chance
Sat 12 – Sun 13 Sep
73° 55°
typical range
Sat 19 – Sun 20 Sep
73° 54°
typical range
30 days — Williamstown
14 forecast + 16 climatology
Mon · Today Showers
78°58°7.1 mm⌄
Wind9 mph NW
Gusts14 mph
UV index7 – High
Precip chance78%
Sunrise06:46
Sunset20:09
Tue · Tomorrow Sunny
78°56°9%⌄
Wind5 mph N
Gusts13 mph
UV index8 – High
Precip chance9%
Sunrise06:47
Sunset20:07
Wednesday 26/8 Sunny
82°57°8%⌄
Wind4 mph NE
Gusts14 mph
UV index7 – High
Precip chance8%
Sunrise06:48
Sunset20:06
Thursday 27/8 Sunny
81°61°15.1 mm⌄
Wind8 mph SW
Gusts17 mph
UV index8 – High
Precip chance79%
Sunrise06:49
Sunset20:04
Friday 28/8 Sunny
81°64°0.3 mm⌄
Wind7 mph NW
Gusts15 mph
UV index7 – High
Precip chance29%
Sunrise06:50
Sunset20:03
Saturday 29/8 Sunny
80°60°6%⌄
Wind5 mph NE
Gusts13 mph
UV index7 – High
Precip chance6%
Sunrise06:51
Sunset20:01
Sunday 30/8 Mostly cloudy
82°63°19%⌄
Wind10 mph N
Gusts14 mph
UV index6 – High
Precip chance19%
Sunrise06:52
Sunset20:00
Monday 31/8 Showers
84°65°3.5 mm⌄
Wind8 mph SW
Gusts14 mph
UV index7 – High
Precip chance76%
Sunrise06:53
Sunset19:58
Tuesday 1/9 Sunny
83°65°2.3 mm⌄
Wind5 mph W
Gusts20 mph
UV index7 – High
Precip chance69%
Sunrise06:54
Sunset19:57
Wednesday 2/9 Fog
86°67°53.7 mm⌄
Wind18 mph W
Gusts33 mph
UV index7 – High
Precip chance90%
Sunrise06:55
Sunset19:55
Thursday 3/9 Fog
81°67°8.6 mm⌄
Wind5 mph W
Gusts19 mph
UV index7 – High
Precip chance84%
Sunrise06:56
Sunset19:54
Friday 4/9 Fog
84°65°11%⌄
Wind5 mph E
Gusts17 mph
UV index7 – High
Precip chance11%
Sunrise06:57
Sunset19:52
Saturday 5/9 Mostly cloudy
87°67°12.8 mm⌄
Wind8 mph SW
Gusts20 mph
UV index7 – High
Precip chance83%
Sunrise06:58
Sunset19:51
Sunday 6/9 Fog
84°70°2.9 mm⌄
Wind8 mph SW
Gusts16 mph
UV index7 – High
Precip chance76%
Sunrise06:58
Sunset19:49
Monday 7/9 Rain (climatological)
75°57°30.0 mm⌄
Day≈69–80°
Night≈51–62°
Precip≈9.1 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 8/9 Partly cloudy (climatological)
77°58°20%⌄
Day≈72–82°
Night≈53–64°
Precip≈9.1 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 9/9 Partly cloudy (climatological)
82°62°20%⌄
Day≈77–88°
Night≈56–67°
Precip≈9.1 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 10/9 Rain (climatological)
75°57°30.8 mm⌄
Day≈70–81°
Night≈52–62°
Precip≈9.1 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Partly cloudy (climatological)
72°55°20%⌄
Day≈67–78°
Night≈50–61°
Precip≈9.1 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Partly cloudy (climatological)
73°56°20%⌄
Day≈68–79°
Night≈51–61°
Precip≈9.1 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Rain (climatological)
72°55°29.3 mm⌄
Day≈67–78°
Night≈50–61°
Precip≈9.1 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Partly cloudy (climatological)
77°58°20%⌄
Day≈71–82°
Night≈53–63°
Precip≈9.1 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Partly cloudy (climatological)
80°60°20%⌄
Day≈75–86°
Night≈55–66°
Precip≈9.1 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Rain (climatological)
79°59°17.7 mm⌄
Day≈73–84°
Night≈54–65°
Precip≈9.1 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
79°59°20%⌄
Day≈73–84°
Night≈54–65°
Precip≈9.1 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
74°56°20%⌄
Day≈69–80°
Night≈51–62°
Precip≈9.1 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Rain (climatological)
70°54°20.0 mm⌄
Day≈64–75°
Night≈48–59°
Precip≈9.1 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
73°56°20%⌄
Day≈67–78°
Night≈50–61°
Precip≈9.1 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Partly cloudy (climatological)
75°57°20%⌄
Day≈69–80°
Night≈51–62°
Precip≈9.1 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Rain (climatological)
78°59°30.8 mm⌄
Day≈72–83°
Night≈53–64°
Precip≈9.1 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 Williamstown, 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.