Romeoville · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Romeoville & 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
85°
Mon, Aug 31
Coldest night
53°
Fri, Sep 4
Days with precip
6 / 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
83° 65°
82% precip chance
Sat 5 – Sun 6 Sep
73° 56°
21% precip chance
Sat 12 – Sun 13 Sep
68° 51°
typical range
Sat 19 – Sun 20 Sep
68° 53°
typical range
30 days — Romeoville
14 forecast + 16 climatology
Tue · Today Mostly cloudy
83°59°11%⌄
Wind6 mph S
Gusts15 mph
UV index8 – High
Precip chance11%
Sunrise06:11
Sunset19:37
Wed · Tomorrow Showers
79°64°1.4 mm⌄
Wind11 mph SW
Gusts21 mph
UV index7 – High
Precip chance59%
Sunrise06:12
Sunset19:35
Thursday 27/8 Sunny
81°65°17%⌄
Wind9 mph NW
Gusts20 mph
UV index7 – High
Precip chance17%
Sunrise06:13
Sunset19:34
Friday 28/8 Sunny
81°65°17%⌄
Wind7 mph NE
Gusts17 mph
UV index7 – High
Precip chance17%
Sunrise06:14
Sunset19:32
Saturday 29/8 Mostly cloudy
82°65°15.2 mm⌄
Wind12 mph SW
Gusts20 mph
UV index7 – High
Precip chance82%
Sunrise06:15
Sunset19:31
Sunday 30/8 Sunny
83°68°9.0 mm⌄
Wind9 mph SW
Gusts31 mph
UV index7 – High
Precip chance80%
Sunrise06:16
Sunset19:29
Monday 31/8 Thunderstorms
85°70°1.2 mm⌄
Wind12 mph SW
Gusts28 mph
UV index6 – High
Precip chance63%
Sunrise06:17
Sunset19:27
Tuesday 1/9 Sunny
76°67°0.6 mm⌄
Wind12 mph NW
Gusts27 mph
UV index6 – High
Precip chance38%
Sunrise06:18
Sunset19:26
Wednesday 2/9 Showers
66°59°0.8 mm⌄
Wind9 mph N
Gusts15 mph
UV index5 – Moderate
Precip chance42%
Sunrise06:19
Sunset19:24
Thursday 3/9 Mostly cloudy
63°54°8.6 mm⌄
Wind6 mph SW
Gusts15 mph
UV index4 – Moderate
Precip chance83%
Sunrise06:20
Sunset19:22
Friday 4/9 Showers
69°53°0.3 mm⌄
Wind9 mph NE
Gusts16 mph
UV index5 – Moderate
Precip chance37%
Sunrise06:21
Sunset19:21
Saturday 5/9 Partly cloudy
71°56°0.1 mm⌄
Wind10 mph NE
Gusts17 mph
UV index5 – Moderate
Precip chance21%
Sunrise06:22
Sunset19:19
Sunday 6/9 Sunny
73°61°7%⌄
Wind7 mph E
Gusts16 mph
UV index6 – High
Precip chance7%
Sunrise06:23
Sunset19:17
Monday 7/9 Showers
64°56°16.7 mm⌄
Wind6 mph S
Gusts18 mph
UV index3 – Moderate
Precip chance91%
Sunrise06:24
Sunset19:16
Tuesday 8/9 Rain (climatological)
70°56°15.3 mm⌄
Day≈65–76°
Night≈51–62°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 9/9 Partly cloudy (climatological)
73°58°20%⌄
Day≈68–78°
Night≈53–64°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 10/9 Partly cloudy (climatological)
71°57°20%⌄
Day≈65–76°
Night≈51–62°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Rain (climatological)
71°57°7.1 mm⌄
Day≈66–76°
Night≈51–62°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Partly cloudy (climatological)
68°55°20%⌄
Day≈62–73°
Night≈49–60°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Partly cloudy (climatological)
62°51°20%⌄
Day≈57–67°
Night≈46–57°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Rain (climatological)
65°53°10.6 mm⌄
Day≈59–70°
Night≈48–59°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Partly cloudy (climatological)
67°55°20%⌄
Day≈62–73°
Night≈49–60°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Partly cloudy (climatological)
70°56°20%⌄
Day≈65–76°
Night≈51–62°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Rain (climatological)
70°56°7.1 mm⌄
Day≈65–75°
Night≈51–62°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
67°55°20%⌄
Day≈62–73°
Night≈49–60°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
68°55°20%⌄
Day≈63–73°
Night≈50–60°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Rain (climatological)
64°53°11.4 mm⌄
Day≈59–70°
Night≈47–58°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Partly cloudy (climatological)
64°53°20%⌄
Day≈59–70°
Night≈47–58°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Partly cloudy (climatological)
69°56°20%⌄
Day≈64–74°
Night≈50–61°
Precip≈4.7 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Rain (climatological)
73°58°10.2 mm⌄
Day≈67–78°
Night≈53–63°
Precip≈4.7 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 Romeoville, 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.