Iona · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Iona & 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
38°
Fri, Aug 21
Coldest night
10°
Mon, Aug 31
Days with precip
2 / 14
of 14 forecast days
Nicest day
Mon, Aug 31
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 22 – Sun 23 Aug
34° 16°
57% precip chance
Sat 29 – Sun 30 Aug
31° 13°
4% precip chance
Sat 5 – Sun 6 Sep
31° 12°
typical range
Sat 12 – Sun 13 Sep
29° 12°
typical range
30 days — Iona
14 forecast + 16 climatology
Fri · Today Mostly cloudy
38°15°4%⌄
Wind21 mph SE
Gusts38 mph
UV index9 – Very high
Precip chance4%
Sunrise06:39
Sunset20:22
Sat · Tomorrow Showers
34°18°1.7 mm⌄
Wind36 mph W
Gusts46 mph
UV index7 – High
Precip chance57%
Sunrise06:40
Sunset20:20
Sunday 23/8 Sunny
33°16°0.4 mm⌄
Wind19 mph SW
Gusts26 mph
UV index9 – Very high
Precip chance36%
Sunrise06:41
Sunset20:19
Monday 24/8 Mostly cloudy
33°16°0.2 mm⌄
Wind19 mph S
Gusts30 mph
UV index8 – Very high
Precip chance17%
Sunrise06:42
Sunset20:17
Tuesday 25/8 Sunny
34°14°17%⌄
Wind12 mph W
Gusts17 mph
UV index8 – Very high
Precip chance17%
Sunrise06:43
Sunset20:15
Wednesday 26/8 Mostly cloudy
35°17°17%⌄
Wind14 mph W
Gusts17 mph
UV index8 – Very high
Precip chance17%
Sunrise06:45
Sunset20:14
Thursday 27/8 Mostly cloudy
30°18°8%⌄
Wind21 mph SW
Gusts30 mph
UV index7 – High
Precip chance8%
Sunrise06:46
Sunset20:12
Friday 28/8 Mostly cloudy
31°13°5%⌄
Wind16 mph SW
Gusts28 mph
UV index7 – High
Precip chance5%
Sunrise06:47
Sunset20:10
Saturday 29/8 Mostly cloudy
31°16°4%⌄
Wind23 mph SW
Gusts37 mph
UV index8 – Very high
Precip chance4%
Sunrise06:48
Sunset20:08
Sunday 30/8 Sunny
30°13°3%⌄
Wind20 mph SW
Gusts27 mph
UV index7 – High
Precip chance3%
Sunrise06:49
Sunset20:07
Monday 31/8 Sunny
30°10°0%⌄
Wind13 mph W
Gusts21 mph
UV index7 – High
Precip chance0%
Sunrise06:50
Sunset20:05
Tuesday 1/9 Mostly cloudy
33°15°6%⌄
Wind15 mph SW
Gusts20 mph
UV index7 – High
Precip chance6%
Sunrise06:51
Sunset20:03
Wednesday 2/9 Mostly cloudy
34°15°5%⌄
Wind26 mph SW
Gusts39 mph
UV index8 – Very high
Precip chance5%
Sunrise06:52
Sunset20:02
Thursday 3/9 Sunny
25°14°2.7 mm⌄
Wind23 mph SE
Gusts40 mph
UV index6 – High
Precip chance57%
Sunrise06:53
Sunset20:00
Friday 4/9 Light rain (climatological)
28°11°1.0 mm⌄
Day≈25–31°
Night≈8–14°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 5/9 Partly cloudy (climatological)
31°13°20%⌄
Day≈28–34°
Night≈10–16°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 6/9 Partly cloudy (climatological)
28°12°20%⌄
Day≈25–31°
Night≈9–15°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 7/9 Light rain (climatological)
29°12°1.0 mm⌄
Day≈26–32°
Night≈9–15°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 8/9 Partly cloudy (climatological)
25°10°20%⌄
Day≈22–28°
Night≈7–13°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 9/9 Partly cloudy (climatological)
26°10°20%⌄
Day≈23–29°
Night≈7–13°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 10/9 Light rain (climatological)
25°9°1.3 mm⌄
Day≈22–28°
Night≈6–12°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Partly cloudy (climatological)
29°12°20%⌄
Day≈26–32°
Night≈9–15°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Partly cloudy (climatological)
29°12°20%⌄
Day≈26–32°
Night≈9–15°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Light rain (climatological)
28°12°2.0 mm⌄
Day≈25–31°
Night≈9–15°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Partly cloudy (climatological)
27°11°20%⌄
Day≈24–30°
Night≈8–14°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Partly cloudy (climatological)
26°10°20%⌄
Day≈23–29°
Night≈7–13°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Light rain (climatological)
25°10°1.7 mm⌄
Day≈22–28°
Night≈7–13°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
25°10°20%⌄
Day≈22–28°
Night≈7–13°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
27°11°20%⌄
Day≈24–30°
Night≈8–14°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Light rain (climatological)
28°11°2.0 mm⌄
Day≈25–31°
Night≈8–14°
Precip≈0.6 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 Iona, 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.