Sumner · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Sumner & 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
31°
Tue, Sep 8
Coldest night
10°
Sun, Aug 30
Days with precip
4 / 14
of 14 forecast days
Nicest day
Sat, Sep 5
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 29 – Sun 30 Aug
23° 10°
22% precip chance
Sat 5 – Sun 6 Sep
26° 10°
5% precip chance
Sat 12 – Sun 13 Sep
19° 8°
typical range
Sat 19 – Sun 20 Sep
19° 7°
typical range
30 days — Sumner
14 forecast + 16 climatology
Thu · Today Sunny
26°15°9%⌄
Wind11 mph W
Gusts15 mph
UV index5 – Moderate
Precip chance9%
Sunrise06:21
Sunset19:59
Fri · Tomorrow Mostly cloudy
21°13°0.2 mm⌄
Wind6 mph SW
Gusts14 mph
UV index6 – High
Precip chance31%
Sunrise06:23
Sunset19:57
Saturday 29/8 Mostly cloudy
20°12°22%⌄
Wind6 mph SW
Gusts15 mph
UV index4 – Moderate
Precip chance22%
Sunrise06:24
Sunset19:55
Sunday 30/8 Mostly cloudy
23°10°16%⌄
Wind5 mph N
Gusts14 mph
UV index5 – Moderate
Precip chance16%
Sunrise06:25
Sunset19:53
Monday 31/8 Mostly cloudy
15°11°7.7 mm⌄
Wind3 mph S
Gusts14 mph
UV index4 – Moderate
Precip chance88%
Sunrise06:26
Sunset19:51
Tuesday 1/9 Showers
20°12°2.7 mm⌄
Wind9 mph SW
Gusts20 mph
UV index5 – Moderate
Precip chance65%
Sunrise06:28
Sunset19:49
Wednesday 2/9 Mostly cloudy
14°11°21.3 mm⌄
Wind5 mph SE
Gusts14 mph
UV index3 – Moderate
Precip chance87%
Sunrise06:29
Sunset19:47
Thursday 3/9 Showers
13°11°10.2 mm⌄
Wind11 mph S
Gusts28 mph
UV index3 – Moderate
Precip chance92%
Sunrise06:30
Sunset19:45
Friday 4/9 Sunny
20°11°0.3 mm⌄
Wind10 mph N
Gusts17 mph
UV index5 – Moderate
Precip chance31%
Sunrise06:32
Sunset19:43
Saturday 5/9 Sunny
24°10°5%⌄
Wind8 mph N
Gusts10 mph
UV index6 – High
Precip chance5%
Sunrise06:33
Sunset19:41
Sunday 6/9 Sunny
26°12°4%⌄
Wind7 mph N
Gusts9 mph
UV index7 – High
Precip chance4%
Sunrise06:34
Sunset19:39
Monday 7/9 Sunny
29°14°2%⌄
Wind6 mph NW
Gusts17 mph
UV index7 – High
Precip chance2%
Sunrise06:36
Sunset19:37
Tuesday 8/9 Sunny
31°15°3%⌄
Wind4 mph NW
Gusts15 mph
UV index8 – Very high
Precip chance3%
Sunrise06:37
Sunset19:35
Wednesday 9/9 Sunny
27°15°8%⌄
Wind4 mph W
Gusts9 mph
UV index7 – High
Precip chance8%
Sunrise06:38
Sunset19:33
Thursday 10/9 Rain (climatological)
17°8°11.0 mm⌄
Day≈14–20°
Night≈5–11°
Precip≈3.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Partly cloudy (climatological)
18°8°20%⌄
Day≈15–21°
Night≈5–11°
Precip≈3.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Partly cloudy (climatological)
19°9°20%⌄
Day≈16–22°
Night≈6–12°
Precip≈3.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Rain (climatological)
18°8°8.6 mm⌄
Day≈15–21°
Night≈5–11°
Precip≈3.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Partly cloudy (climatological)
16°7°20%⌄
Day≈13–19°
Night≈4–10°
Precip≈3.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Partly cloudy (climatological)
14°5°20%⌄
Day≈11–17°
Night≈2–8°
Precip≈3.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Rain (climatological)
16°7°11.7 mm⌄
Day≈13–19°
Night≈4–10°
Precip≈3.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
16°7°20%⌄
Day≈13–19°
Night≈4–10°
Precip≈3.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
19°9°20%⌄
Day≈16–22°
Night≈6–12°
Precip≈3.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Rain (climatological)
19°8°11.0 mm⌄
Day≈16–22°
Night≈5–11°
Precip≈3.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
16°7°20%⌄
Day≈13–19°
Night≈4–10°
Precip≈3.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Partly cloudy (climatological)
16°7°20%⌄
Day≈13–19°
Night≈4–10°
Precip≈3.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Rain (climatological)
14°6°11.3 mm⌄
Day≈11–17°
Night≈3–9°
Precip≈3.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Partly cloudy (climatological)
15°7°20%⌄
Day≈12–18°
Night≈4–10°
Precip≈3.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Partly cloudy (climatological)
16°7°20%⌄
Day≈13–19°
Night≈4–10°
Precip≈3.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 25/9 Rain (climatological)
19°9°9.5 mm⌄
Day≈16–22°
Night≈6–12°
Precip≈3.6 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 Sumner, 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.