Tri-Cities, Washington, United States climate

Average temperatures, precipitation and all-time records for Tri-Cities, Washington, United States, with every day graded against ~45 years of local climate history (1981–2026). Its warmest month is July, averaging a high of 90°F, and its coldest is January, with an average low of 28°F.

The Tri-Cities are three closely linked cities at the confluence of the Yakima, Snake, and Columbia Rivers in the U.S. state of Washington. Located in the Columbia Basin of Eastern Washington, the cities border one another, making the Tri-Cities seem like one uninterrupted mid-sized city. via Wikipedia

How today compares

Latest recorded day: 2026-07-21. Each reading placed on Tri-Cities, Washington, United States's own ±7-day seasonal distribution.

High 98°F High · 79th pct

Low 61°F Normal · 42nd pct

Feels-like 98°F Above Normal · 64th pct

Humidity 10.0 g/m³ Above Normal · 66th pct

Wind 5 mph Near Record · 1st pct

Precip 0.00 in Dry

Open Tri-Cities in the live weather grader →

Tri-Cities average temperatures by month

Typical daily high and low, and average precipitation, for each month in Tri-Cities, Washington, United States, based on 1981–2026 records. The wettest month is December (0.10 in on an average day).

Month	Avg high	Avg low	Avg precip
January	42°F	28°F	0.00 in
February	48°F	31°F	0.00 in
March	57°F	36°F	0.00 in
April	64°F	41°F	0.00 in
May	73°F	48°F	0.00 in
June	79°F	54°F	0.00 in
July	90°F	62°F	0.00 in
August	89°F	62°F	0.00 in
September	78°F	54°F	0.00 in
October	65°F	44°F	0.00 in
November	51°F	35°F	0.00 in
December	41°F	29°F	0.10 in

Jan 18°–52°

Feb 24°–56°

Mar 29°–66°

Apr 34°–75°

May 41°–85°

Jun 47°–91°

Jul 55°–100°

Aug 56°–99°

Sep 47°–89°

Oct 37°–74°

Nov 26°–59°

Dec 19°–52°

Each bar spans the 10th-percentile daily low to the 90th-percentile daily high (the range most days fall within), coloured cold → hot on a shared -10°F to 115°F scale, so the whole year's rhythm reads at a glance.

Thinking of visiting Tri-Cities?

Trips live and die by the weather. See how Tri-Cities's comfort stacks up against where you live. Tri-Cities is pre-loaded, just add your city.

Compare Tri-Cities's comfort with your city →

Record extremes

Hottest day on record: 115°F on 2021-06-29
Coldest day on record: -7°F on 1990-12-29

All Tri-Cities weather records →

Percentiles compare each day to Tri-Cities, Washington, United States's own history, so grades are relative to this location: a “Near Record” day here isn't the same temperature as elsewhere. How the grades work →