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
44°
Wed, Sep 2
Coldest night
11°
Tue, Sep 8
Days with precip
6 / 14
of 14 forecast days
Nicest day
Mon, Sep 7
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 29 – Sun 30 Aug
41° 22°
57% precip chance
Sat 5 – Sun 6 Sep
28° 13°
79% precip chance
Sat 12 – Sun 13 Sep
31° 17°
typical range
Sat 19 – Sun 20 Sep
32° 16°
typical range
30 days — Saint Marys
14 forecast + 16 climatology
Wed · Today Sunny
33°21°6%⌄
Wind20 mph NE
Gusts35 mph
UV index8 – Very high
Precip chance6%
Sunrise06:47
Sunset20:04
Thu · Tomorrow Sunny
33°21°2%⌄
Wind11 mph N
Gusts24 mph
UV index8 – Very high
Precip chance2%
Sunrise06:48
Sunset20:03
Friday 28/8 Sunny
34°20°3%⌄
Wind17 mph SE
Gusts36 mph
UV index8 – Very high
Precip chance3%
Sunrise06:49
Sunset20:01
Saturday 29/8 Showers
38°22°0.4 mm⌄
Wind23 mph SW
Gusts39 mph
UV index9 – Very high
Precip chance36%
Sunrise06:50
Sunset20:00
Sunday 30/8 Showers
41°23°1.7 mm⌄
Wind20 mph S
Gusts43 mph
UV index10 – Very high
Precip chance57%
Sunrise06:51
Sunset19:58
Monday 31/8 Showers
35°23°2.0 mm⌄
Wind11 mph S
Gusts22 mph
UV index7 – High
Precip chance59%
Sunrise06:52
Sunset19:57
Tuesday 1/9 Sunny
38°23°0.8 mm⌄
Wind8 mph S
Gusts16 mph
UV index9 – Very high
Precip chance36%
Sunrise06:53
Sunset19:55
Wednesday 2/9 Sunny
44°26°1.2 mm⌄
Wind16 mph SW
Gusts29 mph
UV index10 – Very high
Precip chance57%
Sunrise06:53
Sunset19:54
Thursday 3/9 Sunny
43°26°17%⌄
Wind21 mph SW
Gusts38 mph
UV index10 – Very high
Precip chance17%
Sunrise06:54
Sunset19:52
Friday 4/9 Sunny
40°28°0.3 mm⌄
Wind15 mph SW
Gusts34 mph
UV index10 – Very high
Precip chance36%
Sunrise06:55
Sunset19:50
Saturday 5/9 Showers
28°19°5.5 mm⌄
Wind19 mph NE
Gusts28 mph
UV index6 – High
Precip chance78%
Sunrise06:56
Sunset19:49
Sunday 6/9 Mostly cloudy
21°13°5.5 mm⌄
Wind16 mph NE
Gusts29 mph
UV index5 – Moderate
Precip chance79%
Sunrise06:57
Sunset19:47
Monday 7/9 Mostly cloudy
23°12°0.1 mm⌄
Wind13 mph N
Gusts24 mph
UV index5 – Moderate
Precip chance23%
Sunrise06:58
Sunset19:46
Tuesday 8/9 Sunny
18°11°5.3 mm⌄
Wind23 mph NW
Gusts29 mph
UV index5 – Moderate
Precip chance64%
Sunrise06:59
Sunset19:44
Wednesday 9/9 Rain (climatological)
29°16°6.0 mm⌄
Day≈26–32°
Night≈13–19°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 10/9 Partly cloudy (climatological)
31°18°20%⌄
Day≈28–34°
Night≈15–21°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Partly cloudy (climatological)
32°19°20%⌄
Day≈29–35°
Night≈16–22°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Rain (climatological)
31°18°6.5 mm⌄
Day≈28–34°
Night≈15–21°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Partly cloudy (climatological)
30°17°20%⌄
Day≈27–33°
Night≈14–20°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Partly cloudy (climatological)
27°16°20%⌄
Day≈24–30°
Night≈13–19°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Rain (climatological)
29°17°3.5 mm⌄
Day≈26–32°
Night≈14–20°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Partly cloudy (climatological)
29°17°20%⌄
Day≈26–32°
Night≈14–20°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
33°19°20%⌄
Day≈30–36°
Night≈16–22°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Rain (climatological)
34°20°5.8 mm⌄
Day≈31–37°
Night≈17–23°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
32°19°20%⌄
Day≈29–35°
Night≈16–22°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
28°16°20%⌄
Day≈25–31°
Night≈13–19°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Rain (climatological)
27°16°6.3 mm⌄
Day≈24–30°
Night≈13–19°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Partly cloudy (climatological)
27°16°20%⌄
Day≈24–30°
Night≈13–19°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Partly cloudy (climatological)
29°16°20%⌄
Day≈26–32°
Night≈13–19°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Rain (climatological)
32°18°5.0 mm⌄
Day≈29–35°
Night≈15–21°
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 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.