Weather in Grass Valley, Oregon
Live weather conditions. Source: Open-Meteo
Updated May 30, 2026 · 02:12 AMET · Refreshes every hour
45°F
Clear sky
Feels like 35°F
59%
Humidity
13 mph
Wind Speed
7-Day Forecast
Fri
May 29
☁️
Cloudy
58°
45°
Sat
May 30
☁️
Cloudy
60°
39°
Sun
May 31
⛅
Partly Cloudy
67°
39°
Mon
Jun 1
☁️
Cloudy
73°
47°
Tue
Jun 2
☁️
Cloudy
78°
54°
Wed
Jun 3
☁️
Cloudy
70°
56°
Thu
Jun 4
⛅
Partly Cloudy
77°
51°
About Weather in Grass Valley
Grass Valley is located in Oregon at coordinates 45.359058°N, 120.784166°W. Weather data is sourced from Open-Meteo, a free and open meteorological API that combines data from national weather services including NOAA, the European Centre for Medium-Range Weather Forecasts (ECMWF), and others.
All temperatures are displayed in Fahrenheit. Wind speed is in miles per hour. The 7-day forecast uses the best available global forecast model for Grass Valley's location. Data is refreshed every hour.
Other Cities in Oregon
Frequently Asked Questions
How accurate is this weather data?▾
Weather data from Open-Meteo achieves approximately ±2°F accuracy for temperature within the first 24 hours. Accuracy decreases with forecast range — 1-3 day forecasts are quite reliable, while 5-7 day forecasts are directionally accurate but less precise. Open-Meteo uses multiple global weather models and selects the best one for each location.
Why are temperatures shown in Fahrenheit?▾
This site is designed primarily for a US audience, so temperatures are shown in Fahrenheit (°F), the standard unit used in the United States. To convert: °C = (°F - 32) × 5/9. For example, 77°F = 25°C, 32°F = 0°C (freezing), 98.6°F = 37°C (body temperature).
What is the climate like in Grass Valley?▾
Grass Valley is located in Oregon in the northern United States. The current conditions shown reflect real-time weather. For historical climate normals (average temperatures by month), the NOAA Climate Data Online tool provides 30-year climate averages for most US cities.
How often is weather data updated?▾
Current conditions are refreshed every hour. The 7-day forecast uses Open-Meteo's latest model run, which is updated every 6 hours with new data from global weather observations including weather balloons, satellites, and ground stations.