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San Dimas weather

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San Dimas weather alerts and warnings

active National Weather Service watches, warnings and advisories

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San Dimas weather in numbers

from 30 years of measured normals

San Dimas swings 51°F across the year, from 94°F highs in July to 43°F lows in February, and February is usually the wettest month in a year that brings about 44 in of precipitation.

Warmest month
July
94°F average high
Coldest month
February
43°F average low
Wettest month
February
44 in a year
Below freezing
Never
overnight lows stay above 32°F
Comfortable
4 months
March, April, May and November
Residents
35,000
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The weather map: all three models at once

NWS, American, European side by side around San Dimas and nearby towns.Live rain radar →
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San Dimas 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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San Dimas 10-day forecast, out to 14 days

where the models agree, and where they split

San Dimas, California (CA) is at its warmest in Jul (average highs near 94°F) and coldest in Feb (lows around 43°F), with roughly 44 in of precipitation across the year. Below, compare what NWS, American, European forecast for San Dimas 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.

San Dimas climate by month

average daytime high and overnight low across a typical year
Jan
59°
44°
Feb
59°
43°
Mar
60°
45°
Apr
70°
49°
May
73°
53°
Jun
81°
58°
Jul
94°
67°
Aug
92°
68°
Sep
86°
63°
Oct
83°
59°
Nov
71°
50°
Dec
67°
49°

Which forecast is most accurate in San Dimas?

CheckWeather Score, graded against the weather that actually happened
ProviderCheckWeather-scoreTempWindRainRun by
European logo
European ★ Best
91
/100rank #1
86±1.4°F93±2.3 mph9597% hitECMWF - European Centre for Medium-Range Weather ForecastsReading, United Kingdom
American logo
American
89
/100rank #2
88±1.2°F89±3.5 mph8994% 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 San Dimas today?
On this page we show what NWS, American, European each forecast for San Dimas 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 San Dimas today or tomorrow?
Check the hourly strip and 7-day forecast above. We compare rain from NWS, American, European for San Dimas 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 San Dimas?
Over the last 30 days, the European model has been the most accurate for San Dimas (CheckWeather Score 91/100), ahead of the American at 89. We grade every model against the recorded weather. See the US accuracy scoreboard for the full method.
What is the warmest month in San Dimas?
July is typically the warmest month in San Dimas, with average highs around 94°F.
How cold does San Dimas get?
The coldest month in San Dimas is February, when overnight lows average about 43°F.
How much rain does San Dimas get?
San Dimas sees roughly 44 in of precipitation a year, with February usually the wettest month.

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