Saint Marys · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Saint Marys & 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°
Fri, Sep 4
Coldest night
49°
Wed, Sep 9
Days with precip
3 / 14
of 14 forecast days
Nicest day
Sun, Sep 6
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 29 – Sun 30 Aug
80° 62°
17% precip chance
Sat 5 – Sun 6 Sep
80° 60°
20% precip chance
Sat 12 – Sun 13 Sep
77° 60°
typical range
Sat 19 – Sun 20 Sep
75° 59°
typical range
30 days — Saint Marys
14 forecast + 16 climatology
Thu · Today Sunny
84°64°0.2 mm⌄
Wind8 mph NW
Gusts13 mph
UV index7 – High
Precip chance22%
Sunrise07:00
Sunset20:18
Fri · Tomorrow Sunny
76°60°12%⌄
Wind10 mph NE
Gusts13 mph
UV index6 – High
Precip chance12%
Sunrise07:01
Sunset20:16
Saturday 29/8 Sunny
77°62°13%⌄
Wind8 mph SE
Gusts10 mph
UV index7 – High
Precip chance13%
Sunrise07:01
Sunset20:15
Sunday 30/8 Mostly cloudy
80°66°17%⌄
Wind13 mph SW
Gusts26 mph
UV index7 – High
Precip chance17%
Sunrise07:02
Sunset20:13
Monday 31/8 Mostly cloudy
83°68°0.2 mm⌄
Wind15 mph SW
Gusts36 mph
UV index6 – High
Precip chance29%
Sunrise07:03
Sunset20:11
Tuesday 1/9 Partly cloudy
85°78°18%⌄
Wind13 mph SW
Gusts35 mph
UV index7 – High
Precip chance18%
Sunrise07:04
Sunset20:10
Wednesday 2/9 Sunny
86°75°7%⌄
Wind13 mph SW
Gusts32 mph
UV index7 – High
Precip chance7%
Sunrise07:05
Sunset20:08
Thursday 3/9 Sunny
86°76°0.6 mm⌄
Wind12 mph W
Gusts35 mph
UV index7 – High
Precip chance41%
Sunrise07:06
Sunset20:07
Friday 4/9 Sunny
87°80°6%⌄
Wind15 mph SW
Gusts38 mph
UV index8 – Very high
Precip chance6%
Sunrise07:07
Sunset20:05
Saturday 5/9 Sunny
80°64°20%⌄
Wind9 mph E
Gusts19 mph
UV index5 – Moderate
Precip chance20%
Sunrise07:08
Sunset20:03
Sunday 6/9 Mostly cloudy
74°60°17%⌄
Wind9 mph S
Gusts14 mph
UV index5 – Moderate
Precip chance17%
Sunrise07:09
Sunset20:02
Monday 7/9 Sunny
71°61°2.1 mm⌄
Wind11 mph NW
Gusts23 mph
UV index6 – High
Precip chance63%
Sunrise07:10
Sunset20:00
Tuesday 8/9 Showers
66°56°4.5 mm⌄
Wind10 mph W
Gusts20 mph
UV index4 – Moderate
Precip chance82%
Sunrise07:11
Sunset19:58
Wednesday 9/9 Sunny
60°49°3.6 mm⌄
Wind17 mph NW
Gusts26 mph
UV index5 – Moderate
Precip chance66%
Sunrise07:12
Sunset19:57
Thursday 10/9 Light rain (climatological)
73°61°1.8 mm⌄
Day≈68–79°
Night≈55–66°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Partly cloudy (climatological)
73°60°20%⌄
Day≈68–78°
Night≈55–66°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Partly cloudy (climatological)
77°63°20%⌄
Day≈72–83°
Night≈58–68°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Rain (climatological)
73°60°2.7 mm⌄
Day≈67–78°
Night≈55–66°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Partly cloudy (climatological)
71°59°20%⌄
Day≈66–76°
Night≈54–65°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Partly cloudy (climatological)
66°56°20%⌄
Day≈61–72°
Night≈51–62°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Rain (climatological)
69°58°3.2 mm⌄
Day≈64–75°
Night≈53–64°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
70°59°20%⌄
Day≈65–76°
Night≈53–64°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
77°63°20%⌄
Day≈72–82°
Night≈57–68°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Rain (climatological)
75°62°2.8 mm⌄
Day≈70–81°
Night≈56–67°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
71°59°20%⌄
Day≈65–76°
Night≈54–64°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Partly cloudy (climatological)
71°59°20%⌄
Day≈65–76°
Night≈54–65°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Rain (climatological)
69°58°2.8 mm⌄
Day≈63–74°
Night≈52–63°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Partly cloudy (climatological)
67°57°20%⌄
Day≈62–72°
Night≈51–62°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Partly cloudy (climatological)
69°58°20%⌄
Day≈64–74°
Night≈53–63°
Precip≈1.0 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 25/9 Light rain (climatological)
77°63°1.8 mm⌄
Day≈71–82°
Night≈57–68°
Precip≈1.0 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 Saint Marys, 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.