Skip to main content
checkweather.io
Every US forecast, compared
CheckWeather US›Sunnyvale

Sunnyvale weather

Loading live data…
NWSNational Blend (NBM)
67°
Clear
Feels 65° · Wind 10 mph · Humidity 71%
AmericanNOAA GFS
66°
Clear
Feels 66° · Wind 6 mph · Humidity 78%
EuropeanECMWF
70°
Clear
Feels 69° · Wind 5 mph · Humidity 60%

Latest for Sunnyvale: NWS (National Blend (NBM)): 67° Clear · American (NOAA GFS): 66° Clear · European (ECMWF): 70° Clear.

The weather map: all three models at once

NWS, American, European side by side around Sunnyvale and nearby towns.Live rain radar →
Loading the three model maps…

Next 14 hours

consensus of the three models

7-day forecast

where the models agree, and where they split

Sunnyvale, CA is at its warmest in Jul (average highs near 88°F) and coldest in Feb (lows around 42°F), with roughly 29 in of precipitation across the year. Below, compare what NWS, American, European forecast for Sunnyvale right now, and see exactly where they disagree.

Sunnyvale climate by month

average daytime high and overnight low across a typical year
Jan
58°
45°
Feb
58°
42°
Mar
60°
44°
Apr
67°
47°
May
74°
51°
Jun
82°
55°
Jul
88°
59°
Aug
85°
59°
Sep
82°
57°
Oct
80°
57°
Nov
65°
48°
Dec
61°
46°

Which forecast is most accurate in the US?

CheckWeather Score — graded against the weather that actually happened
ProviderCheckWeather Score🌡 Temp💨 Wind🌧 RainRun by
European logo
European ★ Best
Behind Apple Weather, Windy
88
/100rank #1
85±1.5°F96±1.2 mph8592% hitECMWF — European Centre for Medium-Range Weather ForecastsReading, United Kingdom
American logo
American
Behind Windy & many free apps
74
/100rank #2
82±1.8°F92±2.6 mph5374% 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 40 cities. Lower error means a higher score. The apps you know (AccuWeather, Apple Weather, The Weather Channel) are built on these models.

Common questions

What's the weather in Sunnyvale today?
On this page we show what NWS, American, European each forecast for Sunnyvale 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 Sunnyvale today or tomorrow?
Check the hourly strip and 7-day forecast above. We compare rain from NWS, American, European for Sunnyvale 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 Sunnyvale?
No single model is always right. NWS, American, European each run their own physics, so we line all three up: when they agree the Sunnyvale 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 Sunnyvale?
Jul is typically the warmest month in Sunnyvale, with average highs around 88°F.
How cold does Sunnyvale get?
The coldest month in Sunnyvale is Feb, when overnight lows average about 42°F.
How much rain does Sunnyvale get?
Sunnyvale sees roughly 29 in of precipitation a year, with Jan usually the wettest month.

The forecasts Americans check

The two biggest apps keep their model a secret, so we can't show their numbers, only link you to them. The National Weather Service is public, so its data sits right in the comparison above.

NWSNational Weather Service
Open model · shown above ✓AWAccuWeather
Closed model · open ↗↗TWCThe Weather Channel
Closed model · open ↗↗

Nearby

Mountain ViewCupertinoLos AltosSanta ClaraLos Altos HillsSaratogaCampbellPalo Alto

More US weather

Most accurate forecastUS rain radarAll US citiesHoliday weather abroadThe European model vs the American model: ECMWF vs GFSThe national forecast models, explained: NBM, UKMO, GEM and ACCESS