Round Lake Beach · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Round Lake Beach & 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
33°
Wed, Sep 2
Coldest night
13°
Tue, Sep 8
Days with precip
4 / 14
of 14 forecast days
Nicest day
Thu, Aug 27
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 29 – Sun 30 Aug
29° 19°
46% precip chance
Sat 5 – Sun 6 Sep
30° 19°
84% precip chance
Sat 12 – Sun 13 Sep
24° 15°
typical range
Sat 19 – Sun 20 Sep
25° 16°
typical range
30 days — Round Lake Beach
14 forecast + 16 climatology
Wed · Today Sunny
31°19°5%⌄
Wind13 mph W
Gusts26 mph
UV index7 – High
Precip chance5%
Sunrise06:11
Sunset19:37
Thu · Tomorrow Sunny
26°18°5%⌄
Wind9 mph N
Gusts16 mph
UV index7 – High
Precip chance5%
Sunrise06:12
Sunset19:35
Friday 28/8 Sunny
26°18°5%⌄
Wind11 mph SW
Gusts19 mph
UV index7 – High
Precip chance5%
Sunrise06:13
Sunset19:33
Saturday 29/8 Mostly cloudy
26°19°13%⌄
Wind12 mph S
Gusts27 mph
UV index6 – High
Precip chance13%
Sunrise06:14
Sunset19:32
Sunday 30/8 Mostly cloudy
29°20°0.9 mm⌄
Wind17 mph SW
Gusts40 mph
UV index7 – High
Precip chance46%
Sunrise06:15
Sunset19:30
Monday 31/8 Mostly cloudy
30°23°1.0 mm⌄
Wind17 mph SW
Gusts38 mph
UV index7 – High
Precip chance57%
Sunrise06:16
Sunset19:28
Tuesday 1/9 Sunny
30°21°8%⌄
Wind11 mph SW
Gusts34 mph
UV index8 – Very high
Precip chance8%
Sunrise06:17
Sunset19:27
Wednesday 2/9 Sunny
33°21°5%⌄
Wind12 mph SW
Gusts19 mph
UV index8 – Very high
Precip chance5%
Sunrise06:18
Sunset19:25
Thursday 3/9 Mostly cloudy
32°26°20%⌄
Wind11 mph SW
Gusts19 mph
UV index7 – High
Precip chance20%
Sunrise06:19
Sunset19:23
Friday 4/9 Mostly cloudy
27°21°7.0 mm⌄
Wind9 mph NE
Gusts17 mph
UV index6 – High
Precip chance80%
Sunrise06:20
Sunset19:21
Saturday 5/9 Mostly cloudy
24°19°4.1 mm⌄
Wind9 mph SE
Gusts23 mph
UV index5 – Moderate
Precip chance84%
Sunrise06:21
Sunset19:20
Sunday 6/9 Mostly cloudy
30°20°14%⌄
Wind10 mph SE
Gusts26 mph
UV index7 – High
Precip chance14%
Sunrise06:22
Sunset19:18
Monday 7/9 Partly cloudy
29°22°7%⌄
Wind9 mph SE
Gusts24 mph
UV index7 – High
Precip chance7%
Sunrise06:24
Sunset19:16
Tuesday 8/9 Mostly cloudy
21°13°7.2 mm⌄
Wind11 mph E
Gusts22 mph
UV index4 – Moderate
Precip chance83%
Sunrise06:25
Sunset19:15
Wednesday 9/9 Rain (climatological)
22°15°2.6 mm⌄
Day≈19–25°
Night≈12–18°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 10/9 Partly cloudy (climatological)
26°17°20%⌄
Day≈23–29°
Night≈14–20°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Partly cloudy (climatological)
25°17°20%⌄
Day≈22–28°
Night≈14–20°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Rain (climatological)
24°16°2.5 mm⌄
Day≈21–27°
Night≈13–19°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Partly cloudy (climatological)
22°15°20%⌄
Day≈19–25°
Night≈12–18°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Partly cloudy (climatological)
21°14°20%⌄
Day≈18–24°
Night≈11–17°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Rain (climatological)
21°14°3.7 mm⌄
Day≈18–24°
Night≈11–17°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Partly cloudy (climatological)
25°17°20%⌄
Day≈22–28°
Night≈14–20°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
24°16°20%⌄
Day≈21–27°
Night≈13–19°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Rain (climatological)
25°17°3.8 mm⌄
Day≈22–28°
Night≈14–20°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
25°17°20%⌄
Day≈22–28°
Night≈14–20°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
23°16°20%⌄
Day≈20–26°
Night≈13–19°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Rain (climatological)
21°15°5.7 mm⌄
Day≈18–24°
Night≈12–18°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Partly cloudy (climatological)
21°15°20%⌄
Day≈18–24°
Night≈12–18°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Partly cloudy (climatological)
24°16°20%⌄
Day≈21–27°
Night≈13–19°
Precip≈1.7 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Rain (climatological)
24°16°4.3 mm⌄
Day≈21–27°
Night≈13–19°
Precip≈1.7 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 Round Lake Beach, 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.