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CheckWeather US›Oregon›Monmouth

Monmouth weather

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Monmouth weather alerts and warnings

active National Weather Service watches, warnings and advisories

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Monmouth weather in numbers

from 30 years of measured normals

Monmouth swings 51°F across the year, from 85°F highs in July to 34°F lows in January, and December is usually the wettest month in a year that brings about 62 in of precipitation.

Warmest month
July
85°F average high
Coldest month
January
34°F average low
Wettest month
December
62 in a year
Below freezing
Never
overnight lows stay above 32°F
Comfortable
4 months
May, June, September and October
Residents
10,000
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The weather map: all three models at once

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

where the models agree, and where they split

Monmouth, Oregon (OR) is at its warmest in Jul (average highs near 85°F) and coldest in Jan (lows around 34°F), with roughly 62 in of precipitation across the year. Below, compare what NWS, American, European forecast for Monmouth 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.

Monmouth climate by month

average daytime high and overnight low across a typical year (1991-2020)
Jan
46°
34°
Feb
50°
35°
Mar
54°
38°
Apr
58°
41°
May
67°
45°
Jun
75°
49°
Jul
85°
54°
Aug
83°
55°
Sep
75°
52°
Oct
62°
44°
Nov
51°
40°
Dec
45°
34°

Source: 1991-2020 averages, ERA5 for this place adjusted with NASA POWER.

How the weather around Monmouth has changed since 1995

Monmouth sits in the same roughly 50 km square of NASA's reanalysis as Salem. That square shows no clear change in temperature between 1995-2004 and 2015-2024. See the full 30-year picture on the Salem page.

Which forecast is most accurate in the US?

CheckWeather Score, graded against the weather that actually happened
ProviderCheckWeather-scoreTempWindRainRun by
European logo
European ★ Best
93
/100rank #1
91±0.9°F97±1.1 mph9396% hitECMWF - European Centre for Medium-Range Weather ForecastsReading, United Kingdom
American logo
American
82
/100rank #2
83±1.7°F94±2.0 mph7184% 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 Monmouth today?
On this page we show what NWS, American, European each forecast for Monmouth 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 Monmouth today or tomorrow?
Check the hourly strip and 7-day forecast above. We compare rain from NWS, American, European for Monmouth 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 Monmouth?
No single model is always right. NWS, American, European each run their own physics, so we line all three up: when they agree the Monmouth 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 Monmouth?
July is typically the warmest month in Monmouth, with average highs around 85°F.
How cold does Monmouth get?
The coldest month in Monmouth is January, when overnight lows average about 34°F.
How much rain does Monmouth get?
Monmouth sees roughly 62 in of precipitation a year, with December usually the wettest month.

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