Richland May Weather

Averages and records for weather in Richland, Washington in the month of May.
Typical Richland May Weather
1991–2020
Average daily high 75.9 °F
Average daily low 46.8 °F
Average monthly precipitation 0.7 inches
Daily chance of precipitation 22.8%
Richland May Weather Records
1894–2024
Highest temperature 105 °F May 26, 1947
Lowest temperature 26 °F May 1, 1905
Highest daily low 73 °F May 29, 1934
Lowest daily high 50 °F May 1, 1915
Hottest average high temperature 88.2 °F 1947
Coldest average high temperature 68.0 °F 1996
Most daily precipitation 0.9 inches May 15, 1994
Most monthly precipitation 2.1 inches 1945
Note: Daily averages are a moving average which includes 14 days before and after
Day Average (°F) Record (°F)
High Low High Low
May 1 71.9 42.3 91 26
May 2 72.2 42.6 92 29
May 3 72.5 43.0 92 31
May 4 72.7 43.4 92 30
May 5 73.0 43.7 93 28
May 6 73.1 44.0 98 30
May 7 73.3 44.2 95 30
May 8 73.5 44.4 96 29
May 9 73.8 44.6 95 27
May 10 74.2 45.0 97 30
May 11 74.4 45.3 98 30
May 12 74.7 45.5 100 31
May 13 75.0 45.8 100 32
May 14 75.3 46.1 101 34
May 15 75.6 46.5 97 33
May 16 75.9 46.8 96 35
May 17 76.2 47.2 100 33
May 18 76.6 47.4 99 31
May 19 76.8 47.7 98 32
May 20 77.1 48.0 101 34
May 21 77.4 48.3 96 33
May 22 77.6 48.6 98 34
May 23 77.7 48.9 101 36
May 24 78.0 49.2 98 32
May 25 78.2 49.5 104 32
May 26 78.2 49.7 105 35
May 27 78.4 50.0 102 35
May 28 78.5 50.2 96 39
May 29 78.7 50.3 101 32
May 30 78.8 50.6 102 37
May 31 78.9 50.7 104 35
Weather Station Details
Years Station Coordinates
1999–2024 Pasco Tri Cities Airport location
1945–1998 Richland location
1894–1944 Kennewick location