Cold steppe climate
Climate Prosser - Washington
Annual high65ºF
Annual low42ºF
Precipitation8.94 inch
| Month | HighºF | LowºF | Precipinch | Snowinch |
|---|---|---|---|---|
| Jan | 42 | 28 | 1.13 | 0 |
| Feb | 48 | 31 | 0.83 | 0 |
| Mar | 58 | 37 | 0.78 | 0 |
| Apr | 66 | 41 | 0.70 | 0 |
| May | 74 | 48 | 0.70 | 0 |
| Jun | 82 | 54 | 0.73 | 0 |
| Jul | 90 | 58 | 0.20 | 0 |
| Aug | 89 | 57 | 0.27 | 0 |
| Sep | 80 | 50 | 0.47 | 0 |
| Oct | 66 | 41 | 0.75 | 0 |
| Nov | 50 | 33 | 1.02 | 0 |
| Dec | 39 | 27 | 1.36 | 3 |
- JanHigh 42ºFLow 28ºFPrecip 1.13 inch
- FebHigh 48ºFLow 31ºFPrecip 0.83 inch
- MarHigh 58ºFLow 37ºFPrecip 0.78 inch
- AprHigh 66ºFLow 41ºFPrecip 0.70 inch
- MayHigh 74ºFLow 48ºFPrecip 0.70 inch
- JunHigh 82ºFLow 54ºFPrecip 0.73 inch
- JulHigh 90ºFLow 58ºFPrecip 0.20 inch
- AugHigh 89ºFLow 57ºFPrecip 0.27 inch
- SepHigh 80ºFLow 50ºFPrecip 0.47 inch
- OctHigh 66ºFLow 41ºFPrecip 0.75 inch
- NovHigh 50ºFLow 33ºFPrecip 1.02 inch
- DecHigh 39ºFLow 27ºFPrecip 1.36 inch
Climate summary
What is the average weather in Prosser, Washington?
Prosser experiences a cold semi-arid climate, defined by very low annual precipitation. Summers are hot and dry, with rainfall generally low, often arriving in brief showers. Winters are cold, bringing occasional snowfall, and are typically the wettest season, contrasting with the dry summer months.
Prosser weather averages
Annual high65ºF
Annual low42ºF
Precipitation8.94 inch
Snowfall3 inch
Daily normals Prosser - Washington - January
| Day | HighºF | LowºF | Prec/ | Prec/ |
|---|---|---|---|---|
| Jan 1 | 38.2 | 26.1 | 0.04 | 0.04 |
| Jan 2 | 38.3 | 26.1 | 0.08 | 0.08 |
| Jan 3 | 38.3 | 26.2 | 0.13 | 0.13 |
| Jan 4 | 38.4 | 26.2 | 0.17 | 0.17 |
| Jan 5 | 38.5 | 26.3 | 0.22 | 0.22 |
| Jan 6 | 38.6 | 26.4 | 0.26 | 0.26 |
| Jan 7 | 38.7 | 26.4 | 0.31 | 0.31 |
| Jan 8 | 38.8 | 26.5 | 0.36 | 0.36 |
| Jan 9 | 38.9 | 26.6 | 0.40 | 0.40 |
| Jan 10 | 39.0 | 26.6 | 0.45 | 0.45 |
| Jan 11 | 39.2 | 26.7 | 0.49 | 0.49 |
| Jan 12 | 39.3 | 26.7 | 0.54 | 0.54 |
| Jan 13 | 39.5 | 26.8 | 0.58 | 0.58 |
| Jan 14 | 39.6 | 26.8 | 0.62 | 0.62 |
| Jan 15 | 39.8 | 26.9 | 0.66 | 0.66 |
| Jan 16 | 39.9 | 26.9 | 0.70 | 0.70 |
| Jan 17 | 40.1 | 26.9 | 0.74 | 0.74 |
| Jan 18 | 40.2 | 27.0 | 0.78 | 0.78 |
| Jan 19 | 40.4 | 27.0 | 0.82 | 0.82 |
| Jan 20 | 40.6 | 27.0 | 0.85 | 0.85 |
| Jan 21 | 40.7 | 27.1 | 0.89 | 0.89 |
| Jan 22 | 40.9 | 27.1 | 0.92 | 0.92 |
| Jan 23 | 41.1 | 27.1 | 0.96 | 0.96 |
| Jan 24 | 41.3 | 27.1 | 1.00 | 1.00 |
| Jan 25 | 41.5 | 27.1 | 1.03 | 1.03 |
| Jan 26 | 41.7 | 27.1 | 1.07 | 1.07 |
| Jan 27 | 41.9 | 27.2 | 1.10 | 1.10 |
| Jan 28 | 42.1 | 27.2 | 1.14 | 1.14 |
| Jan 29 | 42.3 | 27.2 | 1.17 | 1.17 |
| Jan 30 | 42.5 | 27.2 | 1.21 | 1.21 |
| Jan 31 | 42.7 | 27.2 | 1.24 | 1.24 |
Precipitation and snow add up through the month (/mo) and the year (/yr)
Weather history Prosser - September 2026
| Day | HighºF | LowºF | Precip.inch |
|---|---|---|---|
| Sep 1 | 95.0 | 46.9 | 0.00 |
| Sep 2 | 96.1 | 55.0 | 0.00 |
| Sep 3 | 75.9 | 51.1 | 0.12 |
| Sep 4 | 70.0 | 48.9 | 0.00 |
| Sep 5 | 73.0 | 48.9 | 0.00 |
| Sep 6 | 70.0 | 53.1 | 0.02 |
| Sep 7 | 66.0 | 53.1 | 0.00 |
| Sep 8 | 75.9 | 50.0 | 0.00 |
| Sep 9 | 80.1 | 53.1 | 0.00 |
| Sep 10 | 86.0 | 54.0 | 0.00 |
| Sep 11 | 84.0 | 54.0 | 0.00 |
| Sep 12 | 84.0 | 54.0 | 0.00 |
| Sep 13 | 84.0 | 51.1 | 0.54 |
| Sep 14 | 84.0 | 50.0 | 0.09 |
| Sep 15 | 71.1 | 50.0 | 0.00 |
| Sep 16 | 71.1 | 50.0 | 0.00 |
| Sep 17 | 78.1 | 50.0 | 0.00 |
| Sep 18 | 75.9 | 54.0 | 0.00 |
| Sep 19 | 82.9 | 54.0 | 0.00 |
| Sep 20 | 82.9 | 53.1 | 0.00 |
| Sep 21 | 84.9 | 53.1 | 0.00 |
| Sep 22 | 86.0 | 55.9 | 0.00 |
| Sep 23 | 86.0 | 50.0 | 0.00 |
| Sep 24 | 87.1 | 48.9 | 0.00 |
| Sep 25 | 69.1 | 48.0 | 0.00 |
| Sep 26 | 69.1 | 43.0 | 0.00 |
| Sep 27 | 69.1 | 43.0 | 0.00 |
| Sep 28 | 69.1 | 42.1 | 0.00 |
| Sep 29 | 75.0 | 43.0 | 0.00 |
| Sep 30 | 78.1 | 54.0 | 0.00 |
The data for September 2026 is incomplete: some days or values are missing.
- –No data
- –Not yet observed or received
- TTrace, too small to measure
Observed extremes
- Highest max temperature96.1ºF · Sep 2
- Lowest max temperature66.0ºF · Sep 7
- Highest min temperature55.9ºF · Sep 22
- Lowest min temperature42.1ºF · Sep 28
Geo Prosser - Washington
Location
- Country
- United States
- State
- Washington
- County
- Benton
- City
- Prosser
- Zip Code
- 99350
- Elevation
- 682 ft
- Longitude
- -119.79
- Latitude
- 46.21
- ICAO
- –
- IATA
- –