Folsom (CA) Temperature by Month
The average annual maximum temperature in Folsom, California, United States of America is 24°C (75°F), with daytime highs ranging from 13°C (55°F) in January to 35°C (95°F) in July. This page covers monthly averages, day-night differences, and how Folsom compares to cities worldwide.
Folsom Monthly Temperatures
In Folsom, temperatures can shift dramatically between very warm in summer and mild in winter. Nights follow the same pattern, with lows ranging from 16°C (61°F) in July to 3°C (37°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Folsom 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. July, the warmest month, gets 440 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Folsom 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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Folsom vs World: Temperature Compared
Folsom's average annual maximum temperature is 24°C (75°F). To put that in context, here's how it compares to a few well-known destinations:
Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.
Zermatt, Switzerland averages just 4°C (39°F) annually due to its altitude, with very cold winters and cool summers even at its warmest.
New York City, USA averages 17°C (63°F) a year, with hot humid summers and cold winters that bring regular snowfall.
Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.
What Does the Temperature Feel Like in Folsom?
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 Folsom, January is the coolest month, with average highs of 14°C (57°F) and humidity around 83% — considered very high. In July, the warmest month, temperatures average 35°C (95°F) with 53% humidity — conditions that feel moderate. 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 Folsom's weather — including monthly rainfall, sunshine hours, and humidity — visit our Folsom climate page.
