Richland weather in May: Richland, Washington: normal highs, lows, rain and records for May
Richland in May has a normal high of 74°F and a normal low of 48°F, a daily mean of 61°F, rising from 70°F on the 1st to 77°F by the 31st. Measurable precipitation falls on 7 days in a normal May, 0.63 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 23°C and low of 9°C, 16 mm of precipitation in May.
- NOAA stationRichland
- Station IDUSC00457015
- Location46.31°N 119.26°W
- Elevation373 ft (114 m)
- Population64,372
- Jan 41° 29°
- Feb 48° 30°
- Mar 57° 35°
- Apr 65° 41°
- May 74° 48°
- Jun 80° 54°
- Jul 89° 60°
- Aug 88° 59°
- Sep 79° 51°
- Oct 64° 42°
- Nov 49° 34°
- Dec 40° 28°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Richland in May?
The normal high is 74°F and the normal low 48°F, for a daily mean of 61.1°F. May is 8.1°F warmer than April and 6.2°F cooler than June. May is the 5th warmest month of the year in Richland and the 6th wettest. Across the month the normal high rises 7°F, from 70°F on May 1 to 77°F on May 31. From one year to the next May's mean temperature typically moves about 2.5°F either way (NOAA's standard deviation), so roughly two Mays in three average between 59°F and 64°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 23%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| May 1 | 70°F | 44°F | 22% | 7% |
| May 8 | 72°F | 46°F | 22% | 7% |
| May 15 | 74°F | 48°F | 23% | 8% |
| May 22 | 75°F | 50°F | 23% | 8% |
| May 31 | 77°F | 52°F | 21% | 7% |
Every day of May: normal high, low and chance of precipitation (warmest afternoon May 31, coldest night May 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| May 1 | 70°F | 44°F | 22% | 7% | 14 h 20 min |
| May 2 | 70°F | 45°F | 22% | 7% | 14 h 20 min |
| May 3 | 71°F | 45°F | 22% | 7% | 14 h 20 min |
| May 4 | 71°F | 45°F | 22% | 7% | 14 h 30 min |
| May 5 | 71°F | 45°F | 22% | 7% | 14 h 30 min |
| May 6 | 72°F | 46°F | 22% | 7% | 14 h 30 min |
| May 7 | 72°F | 46°F | 22% | 7% | 14 h 40 min |
| May 8 | 72°F | 46°F | 22% | 7% | 14 h 40 min |
| May 9 | 72°F | 47°F | 22% | 7% | 14 h 40 min |
| May 10 | 73°F | 47°F | 22% | 7% | 14 h 40 min |
| May 11 | 73°F | 47°F | 23% | 7% | 14 h 50 min |
| May 12 | 73°F | 47°F | 23% | 8% | 14 h 50 min |
| May 13 | 74°F | 48°F | 23% | 8% | 14 h 50 min |
| May 14 | 74°F | 48°F | 23% | 8% | 14 h 50 min |
| May 15 | 74°F | 48°F | 23% | 8% | 15 h |
| May 16 | 74°F | 48°F | 23% | 8% | 15 h |
| May 17 | 74°F | 49°F | 23% | 8% | 15 h |
| May 18 | 75°F | 49°F | 23% | 8% | 15 h |
| May 19 | 75°F | 49°F | 23% | 8% | 15 h 10 min |
| May 20 | 75°F | 50°F | 23% | 8% | 15 h 10 min |
| May 21 | 75°F | 50°F | 23% | 8% | 15 h 10 min |
| May 22 | 75°F | 50°F | 23% | 8% | 15 h 10 min |
| May 23 | 76°F | 50°F | 23% | 8% | 15 h 10 min |
| May 24 | 76°F | 50°F | 23% | 8% | 15 h 20 min |
| May 25 | 76°F | 51°F | 23% | 8% | 15 h 20 min |
| May 26 | 76°F | 51°F | 22% | 8% | 15 h 20 min |
| May 27 | 76°F | 51°F | 22% | 8% | 15 h 20 min |
| May 28 | 76°F | 51°F | 22% | 8% | 15 h 20 min |
| May 29 | 77°F | 52°F | 22% | 7% | 15 h 30 min |
| May 30 | 77°F | 52°F | 22% | 7% | 15 h 30 min |
| May 31 | 77°F | 52°F | 21% | 7% | 15 h 30 min |
- Normal high
- 74°FMay average
- Normal low
- 48°FMay average
- Precipitation
- 0.63 inmonth total
- Days with precipitation
- 70.01 inch or more
- Days at 90°F or more
- 1
- Daylight
- 14 h 20 min to 15 h 30 minMay 1 to May 31
- Days at 70°F or more
- 20
- Days at 80°F or more
- 8
- Sunshine
- 81%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00457015; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Richland in May?
On a given May day the chance of 0.01 inch or more is 23% on average, highest around May 19 (23%). In all, 0.63 in falls on 7 days of a normal May.
In a normal May in Richland, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00457015.
What are the records for May in Richland?
The warmest May temperature on this station's record (since 1944) is 105°F, on May 26, 1947; the coldest is 30°F, on May 1, 1954. The wettest May brought 2.07 in (1945).
The May mean against the 1991-2020 normal of 61.1°F: 2021 62.3°F (+1.2), 2022 57.0°F (−4.1), 2023 66.0°F (+4.9), 2024 60.1°F (−1.0), 2025 61.4°F (+0.3), 2026 64.2°F (+3.1). 4 of 6 ran warmer than normal.
| May | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 62.3°F | +1.2°F | 0.11 in |
| 2022 | 57.0°F | −4.1°F | 0.71 in |
| 2023 | 66.0°F | +4.9°F | 0.06 in |
| 2024 | 60.1°F | −1.0°F | 0.64 in |
| 2025 | 61.4°F | +0.3°F | 0.94 in |
| 2026 | 64.2°F | +3.1°F | 0.12 in |
Source: records: ACIS, station USC00457015; recent months: ACIS, station USC00457015. Records and recent months use complete months only.
How does May in Richland compare across Washington?
Across the 96 places PlainClimate covers in Washington, May normal highs run from 59°F in Long Beach to 77°F in Pasco; Richland's is 74°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.