Warm-summer Mediterranean climate
Climate Dayton - Washington
Annual high62ºF
Annual low40ºF
Precipitation19.07 inch
| Month | HighºF | LowºF | Precipinch | Snowinch |
|---|---|---|---|---|
| Jan | 41 | 27 | 2.28 | 6 |
| Feb | 46 | 29 | 1.71 | 3 |
| Mar | 53 | 34 | 2.18 | 1 |
| Apr | 60 | 38 | 1.72 | 0 |
| May | 69 | 45 | 1.75 | 0 |
| Jun | 76 | 50 | 1.27 | 0 |
| Jul | 86 | 56 | 0.47 | 0 |
| Aug | 86 | 55 | 0.50 | 0 |
| Sep | 76 | 47 | 0.79 | 0 |
| Oct | 63 | 38 | 1.51 | 0 |
| Nov | 48 | 32 | 2.70 | 1 |
| Dec | 39 | 26 | 2.19 | 6 |
- JanHigh 41ºFLow 27ºFPrecip 2.28 inch
- FebHigh 46ºFLow 29ºFPrecip 1.71 inch
- MarHigh 53ºFLow 34ºFPrecip 2.18 inch
- AprHigh 60ºFLow 38ºFPrecip 1.72 inch
- MayHigh 69ºFLow 45ºFPrecip 1.75 inch
- JunHigh 76ºFLow 50ºFPrecip 1.27 inch
- JulHigh 86ºFLow 56ºFPrecip 0.47 inch
- AugHigh 86ºFLow 55ºFPrecip 0.50 inch
- SepHigh 76ºFLow 47ºFPrecip 0.79 inch
- OctHigh 63ºFLow 38ºFPrecip 1.51 inch
- NovHigh 48ºFLow 32ºFPrecip 2.70 inch
- DecHigh 39ºFLow 26ºFPrecip 2.19 inch
Climate summary
What is the average weather in Dayton, Washington?
Dayton experiences a warm-summer climate with dry summers and wetter winters, typical of its region. Winters are cold and bring regular snowfall, while summers are warm. Overall, the area receives low annual precipitation, with frequent rain or drizzle common during the cooler season.
Dayton weather averages
Annual high62ºF
Annual low40ºF
Precipitation19.07 inch
Snowfall17 inch
Daily normals Dayton - Washington - January
| Day | HighºF | LowºF | Prec/ | Prec/ | Snow/ | Snow/ |
|---|---|---|---|---|---|---|
| Jan 1 | 39.8 | 25.6 | 0.06 | 0.06 | 0.20 | 0.20 |
| Jan 2 | 39.9 | 25.6 | 0.12 | 0.12 | 0.40 | 0.40 |
| Jan 3 | 40.0 | 25.7 | 0.19 | 0.19 | 0.60 | 0.60 |
| Jan 4 | 40.1 | 25.7 | 0.25 | 0.25 | 0.70 | 0.70 |
| Jan 5 | 40.2 | 25.7 | 0.31 | 0.31 | 0.90 | 0.90 |
| Jan 6 | 40.3 | 25.8 | 0.38 | 0.38 | 1.20 | 1.20 |
| Jan 7 | 40.4 | 25.9 | 0.44 | 0.44 | 1.40 | 1.40 |
| Jan 8 | 40.5 | 25.9 | 0.51 | 0.51 | 1.60 | 1.60 |
| Jan 9 | 40.6 | 26.0 | 0.58 | 0.58 | 1.80 | 1.80 |
| Jan 10 | 40.7 | 26.0 | 0.65 | 0.65 | 2.00 | 2.00 |
| Jan 11 | 40.8 | 26.1 | 0.72 | 0.72 | 2.30 | 2.30 |
| Jan 12 | 41.0 | 26.2 | 0.79 | 0.79 | 2.50 | 2.50 |
| Jan 13 | 41.1 | 26.2 | 0.86 | 0.86 | 2.70 | 2.70 |
| Jan 14 | 41.2 | 26.3 | 0.93 | 0.93 | 3.00 | 3.00 |
| Jan 15 | 41.3 | 26.4 | 1.00 | 1.00 | 3.20 | 3.20 |
| Jan 16 | 41.5 | 26.4 | 1.06 | 1.06 | 3.40 | 3.40 |
| Jan 17 | 41.6 | 26.5 | 1.13 | 1.13 | 3.70 | 3.70 |
| Jan 18 | 41.7 | 26.5 | 1.20 | 1.20 | 3.90 | 3.90 |
| Jan 19 | 41.8 | 26.6 | 1.26 | 1.26 | 4.10 | 4.10 |
| Jan 20 | 42.0 | 26.7 | 1.33 | 1.33 | 4.30 | 4.30 |
| Jan 21 | 42.1 | 26.7 | 1.40 | 1.40 | 4.50 | 4.50 |
| Jan 22 | 42.2 | 26.8 | 1.47 | 1.47 | 4.70 | 4.70 |
| Jan 23 | 42.4 | 26.8 | 1.54 | 1.54 | 4.90 | 4.90 |
| Jan 24 | 42.5 | 26.9 | 1.61 | 1.61 | 5.10 | 5.10 |
| Jan 25 | 42.6 | 26.9 | 1.67 | 1.67 | 5.30 | 5.30 |
| Jan 26 | 42.7 | 27.0 | 1.74 | 1.74 | 5.50 | 5.50 |
| Jan 27 | 42.9 | 27.0 | 1.81 | 1.81 | 5.70 | 5.70 |
| Jan 28 | 43.0 | 27.1 | 1.88 | 1.88 | 5.80 | 5.80 |
| Jan 29 | 43.1 | 27.1 | 1.95 | 1.95 | 6.00 | 6.00 |
| Jan 30 | 43.3 | 27.2 | 2.01 | 2.01 | 6.10 | 6.10 |
| Jan 31 | 43.4 | 27.2 | 2.08 | 2.08 | 6.30 | 6.30 |
Precipitation and snow add up through the month (/mo) and the year (/yr)
Weather history Dayton - September 2026
| Day | HighºF | LowºF | Precip.inch |
|---|---|---|---|
| Sep 1 | 87.1 | 51.1 | 0.00 |
| Sep 2 | 79.0 | 57.0 | 0.00 |
| Sep 3 | 73.9 | 52.0 | 0.00 |
| Sep 4 | 64.0 | 45.0 | 0.06 |
| Sep 5 | 69.1 | 45.0 | 0.02 |
| Sep 6 | 66.0 | 46.9 | 0.01 |
| Sep 7 | 62.1 | 53.1 | 0.04 |
| Sep 8 | 71.1 | 46.0 | T |
| Sep 9 | 78.1 | 48.9 | 0.00 |
| Sep 10 | 82.9 | 48.0 | 0.00 |
| Sep 11 | 82.9 | 48.0 | 0.00 |
| Sep 12 | 73.0 | 46.9 | 0.00 |
| Sep 13 | 79.0 | 52.0 | 0.16 |
| Sep 14 | 61.0 | 51.1 | 0.05 |
| Sep 15 | 66.9 | 45.0 | 0.00 |
| Sep 16 | 70.0 | 45.0 | 0.00 |
| Sep 17 | 75.9 | 45.0 | 0.00 |
| Sep 18 | 68.0 | 48.9 | 0.00 |
| Sep 19 | 75.9 | 48.0 | 0.00 |
| Sep 20 | 82.0 | 48.9 | 0.00 |
| Sep 21 | 84.9 | 50.0 | 0.00 |
| Sep 22 | 84.9 | 54.0 | 0.00 |
| Sep 23 | 73.9 | 43.0 | 0.00 |
| Sep 24 | 73.0 | 45.0 | 0.00 |
| Sep 25 | 75.9 | 48.0 | 0.00 |
| Sep 26 | 66.9 | 44.1 | 0.02 |
| Sep 27 | 64.9 | 39.9 | 0.00 |
| Sep 28 | 62.1 | 36.0 | 0.00 |
| Sep 29 | 68.0 | 39.9 | 0.00 |
| Sep 30 | 73.0 | 57.9 | 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 temperature87.1ºF · Sep 1
- Lowest max temperature61.0ºF · Sep 14
- Highest min temperature57.9ºF · Sep 30
- Lowest min temperature36.0ºF · Sep 28
Geo Dayton - Washington
Location
- Country
- United States
- State
- Washington
- County
- Columbia
- City
- Dayton
- Zip Code
- 99328
- Elevation
- 1693 ft
- Longitude
- -117.97
- Latitude
- 46.32
- ICAO
- –
- IATA
- –