San Marino, San Marino Climate & Monthly Averages
San Marino has a humid subtropical climate. July is the hottest month, averaging 82° by day; January is the coldest at 44°.
Sunshine is a defining feature of San Marino's climate
San Marino runs on a dry-summer rhythm: the warmest months are also the driest. July averages 1.8 inches (46 mm) while the wet season peaks in May at 5.1 inches (130 mm). Highs range from 44°F (6°C) to 82°F (28°C).
How sun, temperature and rain fit together
January is the coolest month, with highs of 44°F (6°C) and lows near 31°F (-1°C). At its warmest, in July, San Marino runs to 82°F (28°C) in the afternoon and back to 63°F (17°C) by dawn. Precipitation concentrates in May - 5.1 inches (130 mm) on 14 days - and thins out by July.
Average lows drop to freezing in one month of the year, January. July is the brightest month at 13.7 hours of sun a day, against an annual average of 9.5. Three of the twelve months pair mild highs with fewer than twelve wet days; the longest unbroken run is August through September. Snow falls on roughly 7 days a year, mostly December through March.
Across the gridded 2015-2024 daily record, the highest daily maximum for this location was 98°F (37°C) and the lowest daily minimum 10°F (-12°C).
More climate facts for San Marino
- Hottest month: July - highs near 82°F (28°C)
- Coldest month: January - highs near 44°F (6°C)
- Decade extremes (2015-2024): 98°F (37°C) high · 10°F (-12°C) low
- Wettest month: May (14 rainy days) · Sunniest: July (13.7 h sun/day)
- Climate type: humid subtropical
- Annual swing: 20°C between the average warmest and coolest month · day to night: 8°C
- Snow: about 7 days a year
- Months with freezing average lows: 1
- Average humidity: 73%
The most comfortable sunny-weather window
Best time to visit San Marino
Aim for June to October if you get the choice: the dry season is running but the afternoons are still bearable, and highs average 74°F (23°C) against roughly 9 wet days a month. For the same question asked the other way round, see where else is warm in June.
What to pack
Pack for San Marino with light clothing for the warm months, a warm jacket and layers for the cooler season and a compact umbrella or rain shell. July nights average 63°F (17°C), so evenings rarely match the afternoons.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Daylight | Wet-day chance | Humidity |
|---|---|---|---|---|---|---|---|---|
| January | 44° | 31° | 10 | 3.1 in | 6.1 h/day | 9.2 h | 32% | 81% |
| February | 48° | 33° | 10 | 3.7 in | 7.3 h/day | 10.4 h | 35% | 77% |
| March | 51° | 36° | 10 | 3.0 in | 9.0 h/day | 11.8 h | 33% | 73% |
| April | 58° | 41° | 11 | 2.8 in | 10.6 h/day | 13.4 h | 37% | 70% |
| May | 65° | 49° | 14 | 5.1 in | 11.2 h/day | 14.7 h | 46% | 72% |
| June | 76° | 58° | 9 | 2.4 in | 13.1 h/day | 15.5 h | 31% | 64% |
| July | 82° | 63° | 8 | 1.8 in | 13.7 h/day | 15.2 h | 25% | 59% |
| August | 80° | 63° | 8 | 2.4 in | 12.3 h/day | 14.0 h | 27% | 62% |
| September | 71° | 55° | 10 | 3.8 in | 10.3 h/day | 12.4 h | 33% | 71% |
| October | 63° | 49° | 11 | 4.4 in | 8.1 h/day | 10.9 h | 35% | 79% |
| November | 53° | 40° | 12 | 4.4 in | 6.0 h/day | 9.6 h | 41% | 83% |
| December | 47° | 34° | 9 | 2.8 in | 5.9 h/day | 8.9 h | 30% | 83% |
San Marino month by month
Each card shows the average high and low. The bar places that month between San Marino's coldest night and warmest afternoon.
January
- Rain
- 10 days
- Sunshine
- 6.1 h
- Daylight
- 9.2 h
- Snow
- 3 days
February
- Rain
- 10 days
- Sunshine
- 7.3 h
- Daylight
- 10.4 h
- Snow
- 2 days
March
- Rain
- 10 days
- Sunshine
- 9.0 h
- Daylight
- 11.8 h
- Snow
- 1 day
April
- Rain
- 11 days
- Sunshine
- 10.6 h
- Daylight
- 13.4 h
May
- Rain
- 14 days
- Sunshine
- 11.2 h
- Daylight
- 14.7 h
June
- Rain
- 9 days
- Sunshine
- 13.1 h
- Daylight
- 15.5 h
July
- Rain
- 8 days
- Sunshine
- 13.7 h
- Daylight
- 15.2 h
August
- Rain
- 8 days
- Sunshine
- 12.3 h
- Daylight
- 14.0 h
September
- Rain
- 10 days
- Sunshine
- 10.3 h
- Daylight
- 12.4 h
October
- Rain
- 11 days
- Sunshine
- 8.1 h
- Daylight
- 10.9 h
November
- Rain
- 12 days
- Sunshine
- 6.0 h
- Daylight
- 9.6 h
December
- Rain
- 9 days
- Sunshine
- 5.9 h
- Daylight
- 8.9 h
- Snow
- 1 day
Looking for warmer alternatives? Browse warm places by month, or compare San Marino's coolest part of the year: January, December, February.
Seasonal weather under San Marino's sunnier skies
Spring (March through May)
Through spring, San Marino is mild: 58°F (14°C) by day, 42°F (6°C) after dark, and rain falls on around 36 of the 90 days. Daylight is generous - around 10.3 hours of sun a day.
Summer (June through August)
Summer in San Marino brings comfortable warmth, with daytime highs averaging 79°F (26°C) and nights around 61°F (16°C); expect showers on roughly 25 days across the season. Daylight is generous - around 13.0 hours of sun a day.
Fall (September through November)
Fall in San Marino is crisp but comfortable, with daytime highs averaging 62°F (17°C) and nights around 48°F (9°C); rain falls on around 33 of the 90 days.
Winter (December through February)
Winter stays firmly cold here - highs near 46°F (8°C), nights near 33°F (0°C), and expect showers on roughly 29 days across the season, plus about 6 snowy days.
How unusual is San Marino?
- San Marino sits close to the middle of our dataset on most measures: 53°F (12°C) as an annual average, 39.8 inches (1010 mm) of precipitation and 9.5 hours of sun a day.
These comparisons use the same ten-year window for every city in the dataset.
San Marino temperature extremes in the 2015–2024 dataset
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need another precipitation unit? Use the rainfall converter.