Historical weather data, all-time temperature records, and monthly climate averages for Richland, WA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Richland typically feels like a proper spring day, with average highs around 63° and lows near 39°. The date's 78-year record spans a wild 53-degree range — from a balmy 78° in 1951 down to a freezing 25° in 1950. Rain is unlikely today, with only an 18% chance of any precipitation.
Richland plays in extremes. The all-time high of 113° in July 2020 and an all-time low of -22° in February 1950 give this city a 135-degree range — one of the most dramatic in the Pacific Northwest. Even the wettest single day on record was a modest 1.12 inches, underscoring how dry this high-desert city tends to run.
Richland runs hot and dry in summer, with late July averaging a scorching 93° high, and winters are cold but manageable, bottoming out around 39° in early January. If you want warmth, aim for July through September; if you want mild and uncrowded, April and October both average 66°. The wettest stretch is the last week of December, though even then you're only looking at about 0.3 inches.