Twin Falls (ID) Temperature by Month
The average annual maximum temperature in Twin Falls, Idaho, United States of America is 17°C (63°F), with daytime highs ranging from 3°C (37°F) in January to 33°C (91°F) in July. This page covers monthly averages, day-night differences, and how Twin Falls compares to cities worldwide.
Twin Falls Monthly Temperatures
Visitors to Twin Falls will encounter a climate influenced by big temperature differences across the year. Nighttime temperatures range from 15°C (59°F) in July to -6°C (21°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Twin Falls by month:
The minimum temperature is often recorded between 4 AM and 6 AM, while the highest temperature is usually reached at 3 PM, when the sun's heating effect is strongest.
The chart below shows the average temperature throughout the year:
Temperature: Twin Falls 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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Twin Falls vs World: Temperature Compared
Twin Falls's average annual maximum temperature is 17°C (63°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.
Reykjavík, Iceland averages 9°C (48°F) a year — mild summers by Icelandic standards, but cold winters and frequent wind.
Chicago, USA averages 15°C (59°F) annually — known for extreme seasonal swings, from bitterly cold winters to warm summers.
Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.
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 Twin Falls's weather — including monthly rainfall, sunshine hours, and humidity — visit our Twin Falls climate page.
