Half Moon · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Half Moon & 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
100°
Thu, Aug 20
Coldest night
70°
Sat, Aug 22
Days with precip
9 / 14
of 14 forecast days
Nicest day
Sun, Aug 30
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 22 – Sun 23 Aug
91° 70°
86% precip chance
Sat 29 – Sun 30 Aug
91° 71°
50% precip chance
Sat 5 – Sun 6 Sep
89° 68°
typical range
Sat 12 – Sun 13 Sep
84° 66°
typical range
30 days — Half Moon
14 forecast + 16 climatology
Wed · Today Sunny
98°74°6%⌄
Wind9 mph S
Gusts19 mph
UV index9 – Very high
Precip chance6%
Sunrise06:33
Sunset19:53
Thu · Tomorrow Sunny
100°75°5.3 mm⌄
Wind11 mph S
Gusts23 mph
UV index9 – Very high
Precip chance59%
Sunrise06:34
Sunset19:52
Friday 21/8 Showers
90°72°28.7 mm⌄
Wind8 mph S
Gusts18 mph
UV index9 – Very high
Precip chance87%
Sunrise06:34
Sunset19:51
Saturday 22/8 Showers
91°70°13.6 mm⌄
Wind16 mph W
Gusts30 mph
UV index8 – High
Precip chance86%
Sunrise06:35
Sunset19:49
Sunday 23/8 Mostly cloudy
88°70°8.8 mm⌄
Wind13 mph N
Gusts24 mph
UV index7 – High
Precip chance86%
Sunrise06:36
Sunset19:48
Monday 24/8 Mostly cloudy
95°70°4.5 mm⌄
Wind8 mph S
Gusts16 mph
UV index8 – Very high
Precip chance68%
Sunrise06:36
Sunset19:47
Tuesday 25/8 Showers
92°75°5.0 mm⌄
Wind8 mph SE
Gusts16 mph
UV index8 – Very high
Precip chance75%
Sunrise06:37
Sunset19:46
Wednesday 26/8 Showers
91°72°6.7 mm⌄
Wind11 mph S
Gusts21 mph
UV index8 – Very high
Precip chance75%
Sunrise06:38
Sunset19:44
Thursday 27/8 Showers
87°73°26.8 mm⌄
Wind11 mph S
Gusts26 mph
UV index7 – High
Precip chance88%
Sunrise06:39
Sunset19:43
Friday 28/8 Showers
76°72°18.0 mm⌄
Wind9 mph S
Gusts25 mph
UV index5 – Moderate
Precip chance93%
Sunrise06:39
Sunset19:42
Saturday 29/8 Fog
90°71°0.5 mm⌄
Wind4 mph SE
Gusts10 mph
UV index8 – Very high
Precip chance50%
Sunrise06:40
Sunset19:40
Sunday 30/8 Sunny
91°72°6%⌄
Wind9 mph S
Gusts13 mph
UV index8 – Very high
Precip chance6%
Sunrise06:41
Sunset19:39
Monday 31/8 Sunny
89°73°0.9 mm⌄
Wind8 mph SE
Gusts17 mph
UV index8 – Very high
Precip chance45%
Sunrise06:42
Sunset19:38
Tuesday 1/9 Mostly cloudy
87°75°0.8 mm⌄
Wind8 mph S
Gusts14 mph
UV index8 – Very high
Precip chance56%
Sunrise06:42
Sunset19:36
Wednesday 2/9 Rain (climatological)
85°68°33.7 mm⌄
Day≈80–91°
Night≈63–74°
Precip≈10.2 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 3/9 Partly cloudy (climatological)
86°69°20%⌄
Day≈81–92°
Night≈63–74°
Precip≈10.2 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 4/9 Partly cloudy (climatological)
91°71°20%⌄
Day≈85–96°
Night≈66–77°
Precip≈10.2 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 5/9 Rain (climatological)
89°70°23.3 mm⌄
Day≈83–94°
Night≈65–76°
Precip≈10.2 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 6/9 Partly cloudy (climatological)
85°68°20%⌄
Day≈80–90°
Night≈62–73°
Precip≈10.2 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 7/9 Partly cloudy (climatological)
83°67°20%⌄
Day≈77–88°
Night≈61–72°
Precip≈10.2 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 8/9 Rain (climatological)
83°67°20.7 mm⌄
Day≈78–89°
Night≈61–72°
Precip≈10.2 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 9/9 Partly cloudy (climatological)
83°67°20%⌄
Day≈78–88°
Night≈61–72°
Precip≈10.2 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 10/9 Partly cloudy (climatological)
87°69°20%⌄
Day≈82–93°
Night≈64–75°
Precip≈10.2 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Rain (climatological)
89°71°24.2 mm⌄
Day≈84–95°
Night≈65–76°
Precip≈10.2 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 12/9 Partly cloudy (climatological)
84°67°20%⌄
Day≈79–90°
Night≈62–73°
Precip≈10.2 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Partly cloudy (climatological)
82°66°20%⌄
Day≈76–87°
Night≈60–71°
Precip≈10.2 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Rain (climatological)
82°66°32.8 mm⌄
Day≈76–87°
Night≈60–71°
Precip≈10.2 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Partly cloudy (climatological)
82°66°20%⌄
Day≈77–88°
Night≈61–72°
Precip≈10.2 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Partly cloudy (climatological)
82°66°20%⌄
Day≈77–88°
Night≈61–72°
Precip≈10.2 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Rain (climatological)
91°71°18.1 mm⌄
Day≈85–96°
Night≈66–77°
Precip≈10.2 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 Half Moon, 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.