Tri-Cities · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Tri-Cities & 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
106°
Sat, Aug 22
Coldest night
60°
Thu, Aug 20
Days with precip
1 / 14
of 14 forecast days
Nicest day
Thu, Aug 13
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 15 – Sun 16 Aug
97° 61°
57% precip chance
Sat 22 – Sun 23 Aug
106° 67°
0% precip chance
Sat 29 – Sun 30 Aug
103° 66°
typical range
Sat 5 – Sun 6 Sep
93° 60°
typical range
30 days — Tri-Cities
14 forecast + 16 climatology
Thu · Today Partly cloudy
91°66°1%⌄
Wind12 mph NE
Gusts18 mph
UV index5 – Moderate
Precip chance1%
Sunrise05:53
Sunset20:09
Fri · Tomorrow Sunny
94°63°1%⌄
Wind13 mph N
Gusts28 mph
UV index5 – Moderate
Precip chance1%
Sunrise05:54
Sunset20:08
Saturday 15/8 Sunny
91°61°1.0 mm⌄
Wind8 mph SE
Gusts15 mph
UV index4 – Moderate
Precip chance57%
Sunrise05:55
Sunset20:06
Sunday 16/8 Sunny
97°66°1%⌄
Wind5 mph S
Gusts11 mph
UV index5 – Moderate
Precip chance1%
Sunrise05:57
Sunset20:04
Monday 17/8 Sunny
95°68°2%⌄
Wind13 mph SW
Gusts27 mph
UV index6 – Moderate
Precip chance2%
Sunrise05:58
Sunset20:03
Tuesday 18/8 Sunny
92°64°1%⌄
Wind17 mph SW
Gusts28 mph
UV index8 – Very high
Precip chance1%
Sunrise05:59
Sunset20:01
Wednesday 19/8 Sunny
90°63°1%⌄
Wind14 mph SW
Gusts25 mph
UV index8 – Very high
Precip chance1%
Sunrise06:00
Sunset19:59
Thursday 20/8 Sunny
94°60°1%⌄
Wind11 mph SW
Gusts19 mph
UV index8 – Very high
Precip chance1%
Sunrise06:02
Sunset19:58
Friday 21/8 Sunny
101°65°0%⌄
Wind7 mph N
Gusts14 mph
UV index9 – Very high
Precip chance0%
Sunrise06:03
Sunset19:56
Saturday 22/8 Sunny
106°72°0%⌄
Wind16 mph SW
Gusts23 mph
UV index10 – Very high
Precip chance0%
Sunrise06:04
Sunset19:54
Sunday 23/8 Sunny
102°67°0%⌄
Wind7 mph SW
Gusts13 mph
UV index9 – Very high
Precip chance0%
Sunrise06:05
Sunset19:52
Monday 24/8 Sunny
101°67°1%⌄
Wind5 mph SW
Gusts11 mph
UV index9 – Very high
Precip chance1%
Sunrise06:07
Sunset19:50
Tuesday 25/8 Sunny
105°72°0.6 mm⌄
Wind7 mph S
Gusts15 mph
UV index10 – Very high
Precip chance36%
Sunrise06:08
Sunset19:49
Wednesday 26/8 Sunny
104°72°0.3 mm⌄
Wind21 mph SW
Gusts40 mph
UV index9 – Very high
Precip chance36%
Sunrise06:09
Sunset19:47
Thursday 27/8 Light rain (climatological)
96°66°1.6 mm⌄
Day≈91–102°
Night≈60–71°
Precip≈0.6 in / August
(climatological)Typical range for these dates · 1991–2020
Friday 28/8 Partly cloudy (climatological)
99°67°20%⌄
Day≈94–105°
Night≈62–73°
Precip≈0.6 in / August
(climatological)Typical range for these dates · 1991–2020
Saturday 29/8 Partly cloudy (climatological)
103°70°20%⌄
Day≈98–109°
Night≈65–75°
Precip≈0.6 in / August
(climatological)Typical range for these dates · 1991–2020
Sunday 30/8 Light rain (climatological)
97°66°1.1 mm⌄
Day≈91–102°
Night≈60–71°
Precip≈0.6 in / August
(climatological)Typical range for these dates · 1991–2020
Monday 31/8 Partly cloudy (climatological)
94°64°20%⌄
Day≈89–100°
Night≈59–70°
Precip≈0.6 in / August
(climatological)Typical range for these dates · 1991–2020
Tuesday 1/9 Partly cloudy (climatological)
82°54°20%⌄
Day≈77–88°
Night≈49–60°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 2/9 Light rain (climatological)
82°54°1.6 mm⌄
Day≈77–87°
Night≈49–59°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 3/9 Partly cloudy (climatological)
91°59°20%⌄
Day≈85–96°
Night≈54–64°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 4/9 Partly cloudy (climatological)
90°59°20%⌄
Day≈84–95°
Night≈53–64°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 5/9 Light rain (climatological)
93°60°1.6 mm⌄
Day≈87–98°
Night≈55–66°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 6/9 Partly cloudy (climatological)
92°60°20%⌄
Day≈86–97°
Night≈55–65°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 7/9 Partly cloudy (climatological)
83°55°20%⌄
Day≈78–89°
Night≈49–60°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 8/9 Light rain (climatological)
82°54°1.5 mm⌄
Day≈77–88°
Night≈49–60°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 9/9 Partly cloudy (climatological)
87°57°20%⌄
Day≈82–92°
Night≈52–62°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 10/9 Partly cloudy (climatological)
89°58°20%⌄
Day≈84–94°
Night≈53–64°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 11/9 Light rain (climatological)
91°59°1.1 mm⌄
Day≈86–96°
Night≈54–65°
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 Tri-Cities, 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.