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CheckWeather USGrass Valley

Grass Valley weather

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Grass Valley weather alerts and warnings

active National Weather Service watches, warnings and advisories

Checking the National Weather Service for active alerts covering Grass Valley…

Grass Valley weather in numbers

from 30 years of measured normals

Grass Valley swings 63°F across the year, from 97°F highs in July to 34°F lows in February, and January is usually the wettest month in a year that brings about 55 in of precipitation.

Warmest month
July
97°F average high
Coldest month
February
34°F average low
Wettest month
January
55 in a year
Below freezing
Never
overnight lows stay above 32°F
Comfortable
3 months
April, May and October
Residents
13,000
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The weather map: all three models at once

NWS, American, European side by side around Grass Valley and nearby towns.Live rain radar →
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Grass Valley hourly forecast: next 14 hours

consensus of the three models

Rain in the next 24 hours, model by model

each model's own hourly precipitation, side by side

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Grass Valley 10-day forecast, out to 14 days

where the models agree, and where they split

Grass Valley, California (CA) is at its warmest in Jul (average highs near 97°F) and coldest in Feb (lows around 34°F), with roughly 55 in of precipitation across the year. Below, compare what NWS, American, European forecast for Grass Valley right now, and see exactly where they disagree.

We grade every model against the weather that actually happened, so you can see which forecast model is most accurate in United States before you trust any single number.

Grass Valley climate by month

average daytime high and overnight low across a typical year
Jan
52°
36°
Feb
52°
34°
Mar
51°
36°
Apr
63°
41°
May
73°
49°
Jun
84°
57°
Jul
97°
65°
Aug
89°
62°
Sep
82°
56°
Oct
75°
51°
Nov
59°
39°
Dec
57°
39°

Which forecast is most accurate in the US?

CheckWeather Score, graded against the weather that actually happened
ProviderCheckWeather-scoreTempWindRainRun by
European logo
European ★ Best
89
/100rank #1
88±1.2°F96±1.2 mph8491% hitECMWF - European Centre for Medium-Range Weather ForecastsReading, United Kingdom
American logo
American
73
/100rank #2
82±1.8°F93±2.3 mph4972% hitNOAA / NCEP (United States)College Park, Maryland, USA

The CheckWeather Score blends temperature, wind and rain accuracy, each measured against ERA5 (the recorded weather) over the last 30 days across 1999 cities. Lower error means a higher score. See which forecast model is most accurate in United States, how we measure forecast accuracy, or which model each weather app uses.

What do you think of the forecasts?

your vote counts

The accuracy above is the measured record. This is your opinion: which forecast service do you trust most in United States? Give each 1 to 5 stars.

NWSNational Blend (NBM)
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AmericanNOAA GFS
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EuropeanECMWF
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One vote per service. Anonymous: we store no personal data, only a one-way hash of your connection for a day to stop double votes.

Common questions

What's the weather in Grass Valley today?
On this page we show what NWS, American, European each forecast for Grass Valley today, side by side and updated live. When all three agree the forecast is reliable; when they split, we flag it so you know the day is genuinely less certain.
Will it rain in Grass Valley today or tomorrow?
Check the hourly strip and 7-day forecast above. We compare rain from NWS, American, European for Grass Valley and flag the days where the models disagree on whether showers actually arrive, which is exactly when a single app can catch you out.
Which forecast is most accurate for Grass Valley?
No single model is always right. NWS, American, European each run their own physics, so we line all three up: when they agree the Grass Valley forecast is reliable, and when they split you should expect surprises. See our tested US accuracy scoreboard for how the models compare.
What is the warmest month in Grass Valley?
July is typically the warmest month in Grass Valley, with average highs around 97°F.
How cold does Grass Valley get?
The coldest month in Grass Valley is February, when overnight lows average about 34°F.
How much rain does Grass Valley get?
Grass Valley sees roughly 55 in of precipitation a year, with January usually the wettest month.

Nearby

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