Climate averages 1991–2020
Tri-Cities weather
in April.
A mild, fairly dry month: the 6th warmest and the 5th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
April is a mild month in Tri-Cities: daytime highs average 19.3°C and nights cool to about 6.6°C. By daytime temperature it is the 6th warmest of the 12 months.
Expect about 17 mm of rain on roughly 5 days, which makes April a fairly dry month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 31 min on an average April day.
The nearest other city in this atlas is Kennewick (6 km away). In April its highs average 19.1°C, about as warm as Tri-Cities, with 17 mm of rain.
Among the 498 cities listed in the United States, Tri-Cities ranks joint 262nd of 498 for the warmest April highs and joint 32nd of 498 for the driest April (rainfall, lowest first). The mean April high of those 498 cities is 19.4°C; Tri-Cities is 0.1°C cooler than that mean.
From April to May, average highs rise by 5.7°C to 25.0°C, and monthly rainfall rises from 17 mm to 18 mm.
The annual picture
April in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Tri-Cities climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 6.0°C-1.5°C | -1.5°C | 34 | 8.1 | 9.19 h |
| February | 9.3°C-0.3°C | -0.3°C | 23 | 6.2 | 10.310 h |
| March | 14.3°C2.8°C | 2.8°C | 24 | 5.9 | 11.912 h |
| April, selected | 19.3°C6.6°C | 6.6°C | 17 | 4.9 | 13.514 h |
| May | 25.0°C11.5°C | 11.5°C | 18 | 4.5 | 15.015 h |
| June | 28.9°C15.3°C | 15.3°C | 13 | 2.8 | 15.716 h |
| July | 34.2°C19.2°C | 19.2°C | 3.8 | 1.0 | 15.415 h |
| August | 33.2°C18.6°C | 18.6°C | 4.2 | 1.0 | 14.214 h |
| September | 27.5°C14.0°C | 14.0°C | 6.9 | 1.8 | 12.613 h |
| October | 18.9°C7.9°C | 7.9°C | 22 | 5.0 | 11.011 h |
| November | 10.7°C2.3°C | 2.3°C | 29 | 7.3 | 9.59 h |
| December | 5.6°C-1.2°C | -1.2°C | 35 | 8.4 | 8.79 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
April in nearby cities
- Kennewick in AprilUnited States · 6 kmHigh 19.1°C · Low 6.5°C · 17 mm rain
- Yakima in AprilUnited States · 108 kmHigh 15.6°C · Low 2.9°C · 19 mm rain
- Spokane in AprilUnited States · 207 kmHigh 14.3°C · Low 3.0°C · 50 mm rain
- Spokane Valley in AprilUnited States · 217 kmHigh 13.7°C · Low 2.2°C · 58 mm rain
- Auburn in AprilUnited States · 259 kmHigh 13.6°C · Low 4.6°C · 118 mm rain
- Kent in AprilUnited States · 263 kmHigh 13.9°C · Low 4.9°C · 113 mm rain
- Gresham in AprilUnited States · 264 kmHigh 14.0°C · Low 4.5°C · 142 mm rain
- Federal Way in AprilUnited States · 266 kmHigh 12.9°C · Low 4.2°C · 118 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Tri-Cities) is explained once on the Tri-Cities year overview and on the Sources, method and limits page.
Kennewick lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.