The best time to visit Tri-Cities
Month-by-month climate averages for Tri-Cities, WA, so you can pick your dates on data rather than guesswork.
The most comfortable time to visit Tri-Cities is usually April and October, when daytime highs sit in the pleasant 60-78°F range and the heaviest December rain is behind you.
Tri-Cities is warmest in July (highs near 98°F) and coldest in January (lows around 28°F), with roughly 10 inches of precipitation across the year and December the wettest month. The sweet spot for most visitors is April and October. Expect overnight frost in January.
These are long-run averages. For the actual days you are travelling, check the live Tri-Cities forecast — and note how much the models agree, because that tells you how much to trust it.
Tri-Cities weather by month
what to expect in Tri-Cities through the yearHere is Tri-Cities's typical weather in each month: the average daytime high and overnight low in °F, how each month feels, and the wettest month marked. Use it to plan any trip to Tri-Cities by season.