Katy · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Katy & 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
40°
Sun, Sep 6
Coldest night
24°
Sat, Sep 12
Days with precip
2 / 14
of 14 forecast days
Nicest day
Fri, Sep 4
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 5 – Sun 6 Sep
40° 25°
5% precip chance
Sat 12 – Sun 13 Sep
39° 24°
typical range
Sat 19 – Sun 20 Sep
36° 23°
typical range
Sat 26 – Sun 27 Sep
37° 23°
typical range
30 days — Katy
14 forecast + 16 climatology
Sun · Today Showers
38°25°3.1 mm⌄
Wind16 mph SE
Gusts22 mph
UV index10 – Very high
Precip chance57%
Sunrise06:59
Sunset19:48
Mon · Tomorrow Sunny
37°25°0.1 mm⌄
Wind16 mph SE
Gusts23 mph
UV index10 – Very high
Precip chance17%
Sunrise07:00
Sunset19:47
Tuesday 1/9 Sunny
38°25°0.4 mm⌄
Wind20 mph SE
Gusts31 mph
UV index10 – Very high
Precip chance36%
Sunrise07:00
Sunset19:46
Wednesday 2/9 Sunny
38°25°0.5 mm⌄
Wind18 mph SE
Gusts21 mph
UV index10 – Very high
Precip chance36%
Sunrise07:01
Sunset19:44
Thursday 3/9 Sunny
36°25°0.1 mm⌄
Wind14 mph SE
Gusts25 mph
UV index8 – Very high
Precip chance17%
Sunrise07:01
Sunset19:43
Friday 4/9 Sunny
38°25°6%⌄
Wind11 mph S
Gusts15 mph
UV index9 – Very high
Precip chance6%
Sunrise07:02
Sunset19:42
Saturday 5/9 Sunny
40°25°5%⌄
Wind9 mph S
Gusts17 mph
UV index9 – Very high
Precip chance5%
Sunrise07:02
Sunset19:41
Sunday 6/9 Sunny
40°26°4%⌄
Wind15 mph NE
Gusts21 mph
UV index10 – Very high
Precip chance4%
Sunrise07:03
Sunset19:40
Monday 7/9 Showers
33°26°1.8 mm⌄
Wind10 mph S
Gusts19 mph
UV index7 – High
Precip chance57%
Sunrise07:03
Sunset19:38
Tuesday 8/9 Sunny
38°25°4%⌄
Wind16 mph S
Gusts27 mph
UV index9 – Very high
Precip chance4%
Sunrise07:04
Sunset19:37
Wednesday 9/9 Sunny
40°26°4%⌄
Wind16 mph S
Gusts24 mph
UV index9 – Very high
Precip chance4%
Sunrise07:04
Sunset19:36
Thursday 10/9 Sunny
40°26°4%⌄
Wind16 mph S
Gusts23 mph
UV index9 – Very high
Precip chance4%
Sunrise07:05
Sunset19:35
Friday 11/9 Sunny
40°26°3%⌄
Wind15 mph S
Gusts21 mph
UV index9 – Very high
Precip chance3%
Sunrise07:05
Sunset19:33
Saturday 12/9 Sunny
39°24°3%⌄
Wind10 mph E
Gusts19 mph
UV index9 – Very high
Precip chance3%
Sunrise07:06
Sunset19:32
Sunday 13/9 Light rain (climatological)
36°24°1.1 mm⌄
Day≈33–39°
Night≈21–27°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Partly cloudy (climatological)
39°25°20%⌄
Day≈36–42°
Night≈22–28°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Partly cloudy (climatological)
39°25°20%⌄
Day≈36–42°
Night≈22–28°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Light rain (climatological)
36°24°1.4 mm⌄
Day≈33–39°
Night≈21–27°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
35°23°20%⌄
Day≈32–38°
Night≈20–26°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
34°23°20%⌄
Day≈31–37°
Night≈20–26°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Light rain (climatological)
36°23°1.8 mm⌄
Day≈33–39°
Night≈20–26°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
35°23°20%⌄
Day≈32–38°
Night≈20–26°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Partly cloudy (climatological)
38°25°20%⌄
Day≈35–41°
Night≈22–28°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Light rain (climatological)
39°25°1.2 mm⌄
Day≈36–42°
Night≈22–28°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Partly cloudy (climatological)
36°24°20%⌄
Day≈33–39°
Night≈21–27°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Partly cloudy (climatological)
36°24°20%⌄
Day≈33–39°
Night≈21–27°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 25/9 Light rain (climatological)
33°22°1.3 mm⌄
Day≈30–36°
Night≈19–25°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 26/9 Partly cloudy (climatological)
35°23°20%⌄
Day≈32–38°
Night≈20–26°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 27/9 Partly cloudy (climatological)
37°25°20%⌄
Day≈34–40°
Night≈22–28°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 28/9 Light rain (climatological)
38°25°0.9 mm⌄
Day≈35–41°
Night≈22–28°
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 Katy, 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.