Monroe (WA) Temperature by Month
The average annual maximum temperature in Monroe, Washington State, United States of America is 15°C (59°F), with daytime highs ranging from 6°C (43°F) in December to 25°C (77°F) in August. This page covers monthly averages, day-night differences, and how Monroe compares to cities worldwide.
Monroe Monthly Temperatures
In Monroe, temperatures can shift dramatically between warm in summer and cold in winter. Nights follow the same pattern, with lows ranging from 12°C (54°F) in August to 1°C (34°F) in December.
The chart below illustrates the average maximum day and minimum night temperatures in Monroe by month:
From around 4 AM to 6 AM temperatures are at their lowest; by 3 PM they've climbed to their daily peak. August, the warmest month, averages 280 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Monroe vs the United States of America
The map below shows the annual temperature across the United States of America. You can also select individual months if you want to compare a specific time of year.
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Monroe vs World: Temperature Compared
Monroe's average annual maximum temperature is 15°C (59°F). To put that in context, here's how it compares to a few well-known destinations:
Lisbon, Portugal averages 21°C (70°F) annually — warm summers, mild winters, and rain mainly in the cooler months.
Glasgow, Scotland averages 13°C (55°F) a year — mild but often grey, with cold winters and rarely hot summers.
San Francisco, USA averages 19°C (66°F) annually, but with little seasonal variation — summers are often cool and foggy, winters mild.
Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.
What Does the Temperature Feel Like in Monroe?
Temperature alone doesn't tell the whole story — humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.
In the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.
In Monroe, December is the coolest month, with average highs of 6°C (43°F) and humidity around 80% — considered very high. In August, the warmest month, temperatures average 25°C (77°F) with 68% humidity — conditions that feel high. For a full picture, see our humidity page.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
Whether a city sits on the coast or deep inland makes a significant difference to its climate. Coastal areas tend to have more stable temperatures year-round — large bodies of water absorb heat slowly in summer and release it gradually in winter, keeping extremes in check. Cities far from the sea don't benefit from that buffer, which is why continental climates tend to have hotter summers and colder winters than their coastal counterparts at the same latitude.
For more on Monroe's weather — including monthly rainfall, sunshine hours, and humidity — visit our Monroe climate page.
