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, May 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 94°F) and coldest in January (lows around 28°F), with roughly 8 inches of precipitation across the year and December the wettest month. The sweet spot for most visitors is April, May 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 year, 1991-2020 averagesHere 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.