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San Marino Weather in September
With daytime temperatures of 25°C (77°F) and nighttime lows of 16°C (61°F), September in San Marino brings high temperatures during the day. Do keep in mind that quite a bit of rainfall is typical. Around 85 mm (3.3 in) falls on average.
Rainfall in San Marino in September
Based on our climate data of the past 30 years, about 10 days of rain are anticipated, with 85 mm (3.3 in) on average. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.
Temperature in San Marino in September
September is a excellent month in San Marino, with 25°C (77°F) during the day and 16°C (61°F) at night. This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. At 16°C (61°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.
Sunshine in San Marino in September
The days are predominantly sunny, with an estimated total of around 205 hours of sunshine. These sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.
Average water temperature in September
The water is 22°C (72°F) this month, warm enough that getting in requires no effort at all. Good conditions for swimming, snorkeling, or just floating around.If you favor pleasant temperatures and minimal rainfall, September is one of the best months to visit San Marino.
San Marino Temperature in September
Min Temperature
16°C (61°F)
Max Temperature
25°C (77°F)
Water Temperature
22°C (72°F) *
Chance of Rain
32%
Precipitation
85 mm (3.3 in)
Rainy days
10 days
Humidity
76% *
Sunshine
205 hours *
Percentage Sunshine
53% *
* Data from: Rimini, Italy (17 KM, 10 Miles).
San Marino Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in San Marino - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in San Marino typically drop from around 26°C (79°F) at the start of September to approximately 23°C (73°F) by the end. Nights are pleasant, with lows typically ranging from 13°C (55°F) to 17°C (63°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather records for San Marino in September
Browse day-by-day weather records for San Marino spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
San Marino historical weather extremes in September
Our historical data for San Marino spans 1976 to 2026, revealing these weather extremes.
- San Marino recorded its highest September temperature of 35°C (95°F) on September 5, 2026.
- The coldest September day was on September 18, 1977, with a maximum of 13°C (55°F).
- San Marino registered its coldest September night on September 29, 1977, with temperatures dropping to 5°C (41°F).
Best Places in San Marino in September
Find out more about the weather in San Marino and which places have the best travel conditions in this month. See all of San Marino in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in San Marino in September
Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Expect heavy rainfall, so bring good rain protection and waterproof bags. Expect water temperatures of around 22°C (72°F), which is ideal for taking a refreshing dip. Bring swimwear and consider packing a towel for drying off. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.
What To Do in San Marino in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming9/10 -
Cycling9/10 -
Walking9/10 -
Barbeque8/10 -
Camping8/10 -
Outdoor sports9/10
San Marino 3-Day Forecast
More climate data for San Marino
Temperature Rainfall Sunshine Humidity Water Temp
See the full San Marino climate overview or explore weather in San Marino.
Popular in September
Where to go in September - average daytime high across popular destinations.
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