Fall in San Marino really marks a change you can feel, starting in early September and stretching to late November.
Average high temperatures drop from the upper 70s °F in early fall to the upper 40s °F by the end of the season, while lows fall from the low 60s °F to the upper 30s °F.
This steady cooling makes autumn one of the most noticeable transitions of the year.
You’ll see changes in the sky and atmosphere right away.
Cloud cover increases fast, so those clear September days turn cloudier by late November.
Rain becomes more common as fall goes on, and daylight hours shrink by over four hours from start to finish.
These shifts make autumn feel like a bridge between summer’s warmth and winter’s chill.
If you’re planning outdoor activities, wondering about sunshine, or just want to be ready for cooler evenings, knowing these patterns will help you enjoy San Marino during fall.
Overview of Fall Weather in San Marino
Fall brings cooler days, shorter daylight, and more clouds compared to summer.
Temperatures drop steadily, rain picks up, and winds get stronger as winter approaches.
Typical Autumn Climate
You can expect fall temperatures in San Marino to start in the upper 70s °F (about 26°C) in early September, falling to the upper 40s °F (around 9°C) by late November.
Nights cool off even faster, often dipping into the 30s °F (1–4°C) near the end.
Rainfall gets more frequent, with monthly totals rising from about 2 inches in September to nearly 3 inches by mid-November.
The chance of a rainy day goes up too, from about 1 in 4 days early on to nearly 1 in 3 days by late fall.
Clouds roll in steadily.
Early September skies are mostly clear or partly cloudy, but by late November, you’ll see more than half the days under cloud cover.
Daylight drops from over 13 hours in September to just over 9 hours in late November.
Transition From Summer to Winter
San Marino shifts quickly from summer warmth to winter chill.
In early September, you might still get afternoons near 79°F (26°C).
By late November, daytime highs settle closer to 49°F (9°C).
Humidity drops fast.
Early fall can feel muggy, but by October, the air feels much drier.
Winds pick up as well, changing from gentle summer breezes to more noticeable gusts averaging 8–10 mph.
The days get shorter by over four hours during fall.
Sunsets move from about 7:45 PM in early September to 4:30 PM at the end of November.
This rapid loss of daylight really stands out for visitors.
Microclimates and Terrain Influence
San Marino’s terrain really shapes its fall weather.
The republic sits on Mount Titano and surrounding hills, with elevations from about 180 feet to over 2,400 feet.
These changes create small but noticeable microclimates.
Higher elevations get colder nights and see frost earlier in the season.
Lower valleys stay a bit warmer and can hang onto mild weather longer.
Wind varies too, with ridges getting stronger gusts than sheltered spots.
San Marino’s spot near the Adriatic Sea brings in some maritime influence.
Early in fall, the sea helps keep things from getting too cold, but by late fall, the inland hills cool faster than the coast.
This leads to sharper temperature swings over short distances.
Average Fall Temperatures
Temperatures in San Marino drop steadily from early September through late November.
Highs fall from warm late-summer numbers to crisp late-autumn days, while nights get much colder and frost becomes likely by the end.
September Temperatures
September can still feel like summer, especially in the first week.
Average daytime highs hit about 26°C (79°F), and nights stay mild around 16°C (61°F).
You can expect comfortable evenings, with only a small chance of dropping below 13°C (55°F).
By mid-September, you’ll notice shorter days and cooler nights.
Highs usually fall to the 22–24°C (72–75°F) range.
Skies stay mostly clear, and humidity starts to ease compared to August, making it nicer to be outside.
Late in the month, the cooling trend becomes obvious.
Highs average closer to 20°C (68°F), and lows may drop to 12°C (54°F).
Rain starts to pick up, but most days are still dry enough for sightseeing.
October Temperatures
October brings a clear shift to cooler weather.
Early in the month, daytime highs average around 18–20°C (64–68°F) with nights near 10–12°C (50–54°F).
You might still get mild afternoons, but mornings often feel chilly.
By mid-October, highs fall into the 15–17°C (59–63°F) range.
Lows can dip to 7–9°C (45–48°F), so you’ll want a jacket, especially after sunset.
Cloud cover increases, so you get fewer bright, sunny days.
Toward the end of October, temperatures drop faster.
Highs average 13–15°C (55–59°F), and lows approach 5°C (41°F).
The chance of a wet day goes up, and sometimes you’ll see fog in the valleys.
November Temperatures
November is the coldest fall month, and you can really feel winter coming.
Early in the month, highs reach about 12–14°C (54–57°F), and lows fall to 4–6°C (39–43°F).
You might spot frost in rural areas at night.
By mid-November, highs average around 10°C (50°F), and lows hover near 3°C (37°F).
Rain becomes more frequent, and this is when you’ll see the cloudiest days.
Late November often feels wintry.
Highs average just 8–9°C (46–48°F), and lows can fall close to 0°C (32°F).
Snow isn’t common, but it’s possible at higher elevations, and daylight hours hit their shortest point.
Rainfall Patterns and Precipitation
During the fall months in San Marino, rain shows up more often and gets steadier.
You can expect moderate totals that increase toward late autumn, with November standing out as the wettest month.
Rain usually falls in light to moderate showers, not heavy downpours, so it’s smart to check the forecast if you’re planning anything outside.
Monthly Rainfall Totals
Rainfall in San Marino during fall trends upward.
September starts off lighter, with averages around 53–65 mm.
October brings more steady rain, usually between 75–90 mm.
By November, totals climb to about 95–100 mm, making it the rainiest month of fall.
This means early fall often feels drier and more settled, while late fall is wetter and a bit less predictable.
The increase is gradual, so you’ll notice more rainy days as the season goes on.
| Month | Average Rainfall (mm) | Typical Rainy Days |
|---|---|---|
| September | 53–65 mm | 7–9 days |
| October | 75–90 mm | 10–12 days |
| November | 95–100 mm | 12–13 days |
These are long-term averages, so some years will be a little different.
Chance of Rain by Month
Your odds of running into rain go up as fall moves along.
In September, the chance of rain on any day sits around 25–30%.
By October, it’s closer to 35–40%, and in November, it jumps to 40–45%, which is the peak for the season.
So if you visit in November, almost half the days might bring some rain.
Showers tend to be spread out, though, so you’ll still get dry spells in between.
If you want to avoid disruptions, plan outdoor activities earlier in the season.
Later on, you’ll need to stay flexible and check the weather more often.
Rainfall Intensity and mm of Rain
Rain in San Marino during fall is usually moderate in intensity.
Showers last a few hours, not just quick bursts.
On rainy days, totals usually land between 5–12 mm, but heavier days in November can hit 20 mm or more.
Unlike summer, when thunderstorms sometimes dump heavy rain, fall rain is steadier and more predictable.
This makes planning a bit easier.
November brings the most intense rain days, sometimes over 10 mm in a day.
September and October have lighter amounts and rarely mess up travel or outdoor plans for long.
Sunshine Hours and Cloud Cover
Autumn in San Marino brings a quick drop in daylight and more overcast skies.
You’ll notice both shorter sunshine hours and a steady rise in cloudy days from September to November.
Average Daily Sunshine
At the start of September, you still get long days with over 13 hours of daylight.
By late November, daylight drops to just over 9 hours, cutting down your time outside.
Actual sunshine hours are less than total daylight because of cloud cover.
Early autumn skies are often clear, so you get more direct sun.
By November, sunshine hours fall sharply as overcast conditions take over.
Here’s a quick look at daylight during the season:
| Month | Average Daylight | Typical Sunshine Hours* |
|---|---|---|
| September | ~13 hrs | 7–8 hrs |
| October | ~11 hrs | 5–6 hrs |
| November | ~9 hrs | 3–4 hrs |
*These numbers can change with cloud cover and local weather.
If you want longer sunny days, plan outdoor activities earlier in the season.
Cloudiness Trends in Autumn
Cloud cover increases fast in autumn.
In early September, skies are clear or partly cloudy about 70% of the time.
By late November, overcast skies show up over 55% of the time, making it the cloudiest part of the season.
You’ll really notice this in November, when gray skies and short days cut down on outdoor visibility.
Cloudy days also feel cooler, since you don’t get as much direct sunlight.
More clouds also mean more wet days.
Light rain becomes common in October and November, adding to the cool, darker feel.
If you like brighter weather, September gives you the best shot before things turn cloudier.
Wind and Atmospheric Conditions
During fall in San Marino, the air feels cooler and the weather settles into more stable patterns.
Winds get gentler than in summer, and humidity levels rise as cool nights add moisture to the air.
These shifts affect comfort, visibility, and just the overall vibe outside.
Typical Wind Speed in Fall
In autumn, you’ll notice moderate breezes across San Marino.
Average wind speeds usually run between 7–12 km/h (4–7 mph), but sometimes stronger gusts come through from the Adriatic coast.
San Marino’s hills and elevation near 674 meters shape local air movement.
Valleys trap cooler air, while ridges get a bit more wind.
So, you’ll find calmer spots in lower areas and a little more breeze up high.
Unlike winter, when storms bring strong winds, fall winds stay steady and rarely get disruptive.
They help keep daytime temperatures comfortable by moving the air around.
If you’re visiting, this makes walking the historic streets or hiking the slopes pretty pleasant, since wind rarely gets harsh.
A light jacket usually does the trick, especially in the evenings.
Dew Point and Humidity
In fall, the dew point usually sits between 10–14°C (50–57°F). That means the air carries a moderate amount of moisture—enough to avoid feeling bone-dry, but not so much that it feels muggy.
Relative humidity hangs out around 65–75% most days. Mornings can feel pretty humid, especially with mist or light fog settling into valleys. When afternoon rolls around and temperatures rise, things dry out a bit.
You’ll notice crisp mornings and cooler nights, particularly in October and November. Higher humidity bumps up the chance of light rain, but heavy downpours don’t happen as often as they do in spring.
The air feels fresh, not sticky. If humidity usually bothers you, fall might just be the best time to enjoy San Marino’s outdoors without much discomfort.
Historical Weather Data and Trends
San Marino’s fall brings a steady cooling trend, shorter days, and a gradual uptick in rain. If you look at seasonal shifts, you’ll spot some consistency, though temperature swings and rainfall totals definitely change from year to year.
Long-Term Climate Averages
Fall temperatures in San Marino drop off as summer fades. Daily highs fall from about 79°F (26°C) in early September to around 49°F (9°C) by late November. Nights get colder too, shifting from roughly 61°F (16°C) down to 38°F (3°C).
Rain picks up through the season. Early September averages about 2.1 inches per month, but by mid-November, it’s closer to 2.9 inches. The odds of a rainy day climb from about 23% in September to 28% in late November.
Clouds start to take over as autumn goes on. Early fall usually brings clearer skies, but by late November, overcast days happen more than half the time. That shift matches up with the region’s move from dry summers into wetter winters.
Daylight hours shrink fast. In September, you get more than 13 hours of daylight, but by late November, it’s down to about 9 hours. The early sunsets and chillier nights really drive home that fall is on its way out.
Variability in Autumn Weather
Averages might give you a decent idea, but honestly, the weather can change a lot from year to year. Some autumns surprise you with those lingering warm days in September, and highs can even hit the mid-80s°F (about 30°C).
Other years, you might get hit with an early cold snap in November. Suddenly, lows drop near freezing before you even expect it.
Rainfall likes to keep you guessing too. Sometimes October barely sees a drizzle, but other years, heavy storms roll in and dump way more rain than usual.
Mid to late November usually brings the wettest stretch, though the timing doesn’t always stick to the script.
Wind patterns make things even more unpredictable. Average speeds start around 7.5 mph in September and climb close to 10 mph by late fall. But you’ll definitely notice some days with stronger gusts than that.
Winds mostly come from the east, but as the season wraps up, they tend to shift north.
So, even if fall has its trends, you never really know what you’re going to get. It’s smart to be ready for everything—mild afternoons, chilly nights, and the occasional bout of wild weather.