Petersburg · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Petersburg & 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
71°
Sat, Sep 5
Coldest night
46°
Thu, Sep 3
Days with precip
6 / 14
of 14 forecast days
Nicest day
Sat, Sep 5
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 5 – Sun 6 Sep
71° 49°
13% precip chance
Sat 12 – Sun 13 Sep
57° 50°
94% precip chance
Sat 19 – Sun 20 Sep
61° 45°
typical range
Sat 26 – Sun 27 Sep
60° 47°
typical range
30 days — Petersburg
14 forecast + 16 climatology
Tue · Today Mostly cloudy
60°48°6.3 mm⌄
Wind4 mph NE
Gusts14 mph
UV index3 – Low
Precip chance86%
Sunrise05:54
Sunset19:48
Wed · Tomorrow Sunny
66°47°10%⌄
Wind5 mph NW
Gusts13 mph
UV index3 – Moderate
Precip chance10%
Sunrise05:56
Sunset19:46
Thursday 3/9 Sunny
66°46°6%⌄
Wind7 mph NW
Gusts16 mph
UV index4 – Moderate
Precip chance6%
Sunrise05:58
Sunset19:43
Friday 4/9 Mostly cloudy
70°47°8%⌄
Wind5 mph N
Gusts16 mph
UV index4 – Moderate
Precip chance8%
Sunrise06:00
Sunset19:40
Saturday 5/9 Sunny
71°49°3%⌄
Wind3 mph SW
Gusts14 mph
UV index4 – Moderate
Precip chance3%
Sunrise06:02
Sunset19:38
Sunday 6/9 Mostly cloudy
68°49°13%⌄
Wind3 mph N
Gusts14 mph
UV index5 – Moderate
Precip chance13%
Sunrise06:04
Sunset19:35
Monday 7/9 Mostly cloudy
68°51°14%⌄
Wind4 mph SW
Gusts15 mph
UV index5 – Moderate
Precip chance14%
Sunrise06:06
Sunset19:32
Tuesday 8/9 Mostly cloudy
57°48°27%⌄
Wind4 mph SW
Gusts13 mph
UV index4 – Moderate
Precip chance27%
Sunrise06:08
Sunset19:30
Wednesday 9/9 Showers
55°47°7.7 mm⌄
Wind5 mph S
Gusts9 mph
UV index3 – Moderate
Precip chance92%
Sunrise06:11
Sunset19:27
Thursday 10/9 Mostly cloudy
57°48°1.5 mm⌄
Wind3 mph NW
Gusts13 mph
UV index3 – Moderate
Precip chance74%
Sunrise06:13
Sunset19:24
Friday 11/9 Mostly cloudy
62°46°18%⌄
Wind4 mph S
Gusts13 mph
UV index5 – Moderate
Precip chance18%
Sunrise06:15
Sunset19:21
Saturday 12/9 Mostly cloudy
57°50°4.4 mm⌄
Wind4 mph S
Gusts10 mph
UV index3 – Moderate
Precip chance84%
Sunrise06:17
Sunset19:19
Sunday 13/9 Showers
55°52°11.6 mm⌄
Wind4 mph E
Gusts10 mph
UV index3 – Moderate
Precip chance94%
Sunrise06:19
Sunset19:16
Monday 14/9 Showers
55°50°17.7 mm⌄
Wind7 mph SE
Gusts15 mph
UV index3 – Moderate
Precip chance93%
Sunrise06:21
Sunset19:13
Tuesday 15/9 Rain (climatological)
64°50°6.8 mm⌄
Day≈58–69°
Night≈44–55°
Precip≈4.2 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Partly cloudy (climatological)
66°51°20%⌄
Day≈60–71°
Night≈45–56°
Precip≈4.2 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
68°52°20%⌄
Day≈63–73°
Night≈47–58°
Precip≈4.2 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Rain (climatological)
64°49°9.6 mm⌄
Day≈58–69°
Night≈44–55°
Precip≈4.2 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
61°48°20%⌄
Day≈56–66°
Night≈42–53°
Precip≈4.2 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
56°45°20%⌄
Day≈50–61°
Night≈39–50°
Precip≈4.2 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Rain (climatological)
61°48°8.6 mm⌄
Day≈55–66°
Night≈42–53°
Precip≈4.2 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Partly cloudy (climatological)
62°49°20%⌄
Day≈57–68°
Night≈43–54°
Precip≈4.2 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Partly cloudy (climatological)
66°51°20%⌄
Day≈61–71°
Night≈46–56°
Precip≈4.2 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Rain (climatological)
68°52°11.8 mm⌄
Day≈62–73°
Night≈46–57°
Precip≈4.2 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 25/9 Partly cloudy (climatological)
63°49°20%⌄
Day≈57–68°
Night≈43–54°
Precip≈4.2 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 26/9 Partly cloudy (climatological)
59°47°20%⌄
Day≈54–64°
Night≈41–52°
Precip≈4.2 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 27/9 Rain (climatological)
60°47°6.1 mm⌄
Day≈55–65°
Night≈42–53°
Precip≈4.2 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 28/9 Partly cloudy (climatological)
57°46°20%⌄
Day≈52–62°
Night≈40–51°
Precip≈4.2 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 29/9 Partly cloudy (climatological)
60°47°20%⌄
Day≈55–65°
Night≈42–53°
Precip≈4.2 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 30/9 Rain (climatological)
63°49°8.6 mm⌄
Day≈58–69°
Night≈44–55°
Precip≈4.2 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 Petersburg, 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.