Arlington Heights · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Arlington Heights & 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
23°
Thu, Sep 10
Coldest night
8°
Sun, Sep 13
Days with precip
2 / 14
of 14 forecast days
Nicest day
Mon, Sep 14
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 5 – Sun 6 Sep
22° 9°
16% precip chance
Sat 12 – Sun 13 Sep
19° 8°
47% precip chance
Sat 19 – Sun 20 Sep
19° 8°
typical range
Sat 26 – Sun 27 Sep
17° 8°
typical range
30 days — Arlington Heights
14 forecast + 16 climatology
Tue · Today Mostly cloudy
21°12°15%⌄
Wind9 mph W
Gusts16 mph
UV index5 – Moderate
Precip chance15%
Sunrise06:26
Sunset19:50
Wed · Tomorrow Showers
20°12°4.0 mm⌄
Wind13 mph SE
Gusts28 mph
UV index3 – Moderate
Precip chance79%
Sunrise06:27
Sunset19:48
Thursday 3/9 Showers
16°11°5.5 mm⌄
Wind11 mph SE
Gusts23 mph
UV index3 – Low
Precip chance85%
Sunrise06:28
Sunset19:46
Friday 4/9 Mostly cloudy
19°9°19%⌄
Wind9 mph NW
Gusts17 mph
UV index3 – Low
Precip chance19%
Sunrise06:30
Sunset19:44
Saturday 5/9 Fog
19°9°16%⌄
Wind7 mph S
Gusts14 mph
UV index5 – Moderate
Precip chance16%
Sunrise06:31
Sunset19:42
Sunday 6/9 Sunny
22°11°10%⌄
Wind7 mph W
Gusts18 mph
UV index6 – High
Precip chance10%
Sunrise06:33
Sunset19:40
Monday 7/9 Mostly cloudy
18°11°16%⌄
Wind7 mph W
Gusts16 mph
UV index4 – Moderate
Precip chance16%
Sunrise06:34
Sunset19:38
Tuesday 8/9 Mostly cloudy
18°11°18%⌄
Wind6 mph W
Gusts13 mph
UV index5 – Moderate
Precip chance18%
Sunrise06:35
Sunset19:36
Wednesday 9/9 Mostly cloudy
20°10°14%⌄
Wind7 mph W
Gusts12 mph
UV index5 – Moderate
Precip chance14%
Sunrise06:37
Sunset19:34
Thursday 10/9 Sunny
23°11°7%⌄
Wind6 mph W
Gusts16 mph
UV index6 – High
Precip chance7%
Sunrise06:38
Sunset19:31
Friday 11/9 Sunny
23°13°0.5 mm⌄
Wind9 mph W
Gusts18 mph
UV index6 – High
Precip chance39%
Sunrise06:39
Sunset19:29
Saturday 12/9 Showers
16°9°0.9 mm⌄
Wind7 mph W
Gusts16 mph
UV index5 – Moderate
Precip chance47%
Sunrise06:41
Sunset19:27
Sunday 13/9 Sunny
19°8°8%⌄
Wind8 mph W
Gusts17 mph
UV index5 – Moderate
Precip chance8%
Sunrise06:42
Sunset19:25
Monday 14/9 Sunny
21°9°3%⌄
Wind6 mph W
Gusts17 mph
UV index6 – High
Precip chance3%
Sunrise06:44
Sunset19:23
Tuesday 15/9 Light rain (climatological)
20°11°1.4 mm⌄
Day≈17–23°
Night≈8–14°
Precip≈0.9 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Partly cloudy (climatological)
20°11°20%⌄
Day≈17–23°
Night≈8–14°
Precip≈0.9 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
22°12°20%⌄
Day≈19–25°
Night≈9–15°
Precip≈0.9 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Light rain (climatological)
22°12°2.0 mm⌄
Day≈19–25°
Night≈9–15°
Precip≈0.9 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
19°10°20%⌄
Day≈16–22°
Night≈7–13°
Precip≈0.9 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
16°8°20%⌄
Day≈13–19°
Night≈5–11°
Precip≈0.9 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Light rain (climatological)
19°10°1.8 mm⌄
Day≈16–22°
Night≈7–13°
Precip≈0.9 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Partly cloudy (climatological)
20°10°20%⌄
Day≈17–23°
Night≈7–13°
Precip≈0.9 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Partly cloudy (climatological)
23°12°20%⌄
Day≈20–26°
Night≈9–15°
Precip≈0.9 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Light rain (climatological)
23°12°1.2 mm⌄
Day≈20–26°
Night≈9–15°
Precip≈0.9 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 25/9 Partly cloudy (climatological)
19°10°20%⌄
Day≈16–22°
Night≈7–13°
Precip≈0.9 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 26/9 Partly cloudy (climatological)
17°9°20%⌄
Day≈14–20°
Night≈6–12°
Precip≈0.9 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 27/9 Rain (climatological)
16°8°2.5 mm⌄
Day≈13–19°
Night≈5–11°
Precip≈0.9 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 28/9 Partly cloudy (climatological)
18°9°20%⌄
Day≈15–21°
Night≈6–12°
Precip≈0.9 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 29/9 Partly cloudy (climatological)
21°11°20%⌄
Day≈18–24°
Night≈8–14°
Precip≈0.9 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 30/9 Light rain (climatological)
21°11°1.4 mm⌄
Day≈18–24°
Night≈8–14°
Precip≈0.9 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 Arlington Heights, 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.