Dumas, WA
Unincorporated community in Columbia County, Washington
Dumas is a small unincorporated community in Columbia County, Washington. It is 4.5 miles NE of Dayton, the nearest town. Its ZIP code is 99361.
Dumas at a glance
- State
- Washington
- County
- Columbia County
- ZIP code
- 99361
- Nearest town
- Dayton (4.5 mi)
- Time zone
- America/Los Angeles
- Coordinates
- 46.2872, -118.0603
Weather in Dumas now
Loading the National Weather Service forecast…
Dumas weather by the hour
Dumas weather for the next 7 days
Source: National Weather Service (NOAA) · forecast for the coordinates of Dumas.
This week in Dumas
Sunrise, sunset and moon in Dumas
What is the weather usually like in Dumas?
Köppen climate classification, calculated from the 1991–2020 normals
- Julywarmest month · 88°F average high
- Januarycoldest month · 26°F average low
- 18.8 inprecipitation per year · 477 mm
- 15.8 insnowfall per year · 40 cm
Average high and low temperature (°F)
Average precipitation (inches)
Best time to visit Dumas: June to September, with mild temperatures and fewer rainy days.
Source: NOAA NCEI U.S. Climate Normals 1991–2020, station DAYTON 1 WSW, WA US (USC00452030), adjusted for the elevation of Dumas.
Dumas weather month by month
Sunrise and sunset in Dumas through the year
| Month | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 7:29 AM | 4:34 PM | 9 h 5 min |
| February | 6:53 AM | 5:19 PM | 10 h 26 min |
| March | 7:02 AM | 6:59 PM | 11 h 56 min |
| April | 6:03 AM | 7:41 PM | 13 h 38 min |
| May | 5:16 AM | 8:20 PM | 15 h 3 min |
| June | 4:57 AM | 8:47 PM | 15 h 50 min |
| July | 5:13 AM | 8:42 PM | 15 h 28 min |
| August | 5:50 AM | 8:03 PM | 14 h 13 min |
| September | 6:29 AM | 7:05 PM | 12 h 36 min |
| October | 7:08 AM | 6:07 PM | 10 h 58 min |
| November | 6:52 AM | 4:21 PM | 9 h 29 min |
| December | 7:26 AM | 4:08 PM | 8 h 41 min |
Times for the 15th of each month, local time (America/Los Angeles).
What is the weather like in Dumas?
Dumas has a warm-summer mediterranean climate. The warmest month is July, with an average high of 88°F (31°C), and the coldest is January, with average lows of 26°F (-3°C).
It gets about 18.8 inches (477 mm) of precipitation a year. The wettest month is November and the driest is July. Snow is common: about 16 inches fall in an average year.
The best time to visit Dumas is June to September. The live forecast on this page comes from the National Weather Service and the climate averages from NOAA’s 1991–2020 U.S. Climate Normals.
Webcams near Dumas
The closest live webcam is Starbuck › East: US 12 at MP 381.6: Delaney, 14.9 miles N of Dumas.
Webcams: Windy.com. Distances in a straight line from Dumas.
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Map of Dumas, WA
Tap any road on the map to see it in Street View below. Map: © OpenStreetMap contributors.
Dumas Street View
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Other communities near Dumas
Questions about Dumas
Where is Dumas, WA?
Dumas is an unincorporated community in Columbia County, Washington, 4.5 miles NE of Dayton.
What county is Dumas in?
Dumas is in Columbia County, Washington.
What is the ZIP code of Dumas, WA?
The ZIP code for Dumas is 99361.
What is the nearest town to Dumas?
Dayton, 4.5 miles away.
Are there webcams near Dumas?
Yes. The closest is Starbuck › East: US 12 at MP 381.6: Delaney, 14.9 miles away.
What is the hottest month in Dumas?
July, with an average high of 88°F (31°C).
What is the coldest month in Dumas?
January, with an average low of 26°F (-3°C).
How much does it rain in Dumas?
About 18.8 inches (477 mm) a year; the wettest month is November.
Does it snow in Dumas?
Yes, about 16 inches of snow fall in an average year.
When is the best time to visit Dumas?
June to September, when temperatures are most pleasant and rainy days are fewer.
What climate does Dumas have?
Warm-summer mediterranean (Köppen Csb).
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