Last updated: July 31, 2025
Under the Köppen–Geiger climate classification Santa Rosa features a humid subtropical climate (Cfa). Temperatures typically range between 8 °C (46 °F) and 24 °C (76 °F) through the year, but rarely can drop to -5 °C (23 °F) or can rise to as high as 40 °C (104 °F). The average annual precipitation amounts to about 587 mm (23.1 inches) and receives 67 rainy days on the 1 mm (0.04 inches) threshold annually. Santa Rosa enjoys an average of 3502 hours of sunshine throughout the year, and daylight varies from 9 hours 40 minutes to 14 hours 36 minutes per day.
The warmest months in Santa Rosa are January, February and December, with daily mean temperatures ranging from 23 to 24 °C (73 - 76 °F) throughout the day. The coldest temperatures usually occur in June, July and August, when daily mean temperatures range from 8 to 10 °C (46 - 50 °F) throughout the day. On average each year, Santa Rosa experiences 127 days above 25 °C (77.0 °F) and 11 days below 0 °C (32.0 °F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum | 40°C (104°F) | 37°C (99°F) | 36°C (96°F) | 31°C (89°F) | 29°C (84°F) | 22°C (72°F) | 23°C (73°F) | 29°C (84°F) | 32°C (91°F) | 35°C (96°F) | 36°C (97°F) | 38°C (101°F) |
| Mean maximum | 37°C (99°F) | 36°C (97°F) | 33°C (92°F) | 29°C (85°F) | 25°C (77°F) | 19°C (66°F) | 20°C (68°F) | 25°C (78°F) | 28°C (83°F) | 32°C (90°F) | 34°C (94°F) | 37°C (99°F) |
| Average high | 30°C (87°F) | 29°C (85°F) | 26°C (79°F) | 23°C (73°F) | 18°C (64°F) | 14°C (58°F) | 14°C (57°F) | 17°C (63°F) | 19°C (67°F) | 22°C (72°F) | 26°C (79°F) | 29°C (85°F) |
| Daily mean | 24°C (76°F) | 23°C (73°F) | 20°C (68°F) | 17°C (62°F) | 12°C (54°F) | 8°C (47°F) | 8°C (46°F) | 10°C (50°F) | 13°C (56°F) | 16°C (61°F) | 20°C (68°F) | 23°C (73°F) |
| Average low | 18°C (65°F) | 17°C (62°F) | 14°C (58°F) | 12°C (53°F) | 7°C (45°F) | 4°C (39°F) | 3°C (38°F) | 4°C (40°F) | 7°C (46°F) | 10°C (50°F) | 13°C (56°F) | 16°C (61°F) |
| Mean minimum | 11°C (53°F) | 9°C (48°F) | 6°C (44°F) | 4°C (40°F) | -0°C (32°F) | -2°C (29°F) | -3°C (27°F) | -3°C (27°F) | 0°C (33°F) | 2°C (36°F) | 7°C (46°F) | 9°C (49°F) |
| Minimum | 8°C (48°F) | 6°C (44°F) | 4°C (39°F) | 1°C (33°F) | -3°C (28°F) | -4°C (25°F) | -4°C (24°F) | -4°C (24°F) | -5°C (23°F) | 0°C (33°F) | 5°C (41°F) | 8°C (47°F) |
Compare temperature, precipitation, sunshine, UV index in Santa Rosa, Argentina with other places around the world.
Santa Rosa usually has the most precipitation in March, April and November, with an average of 7 rainy days and 80 mm (3.2 inches) of precipitation per month. The driest months in Santa Rosa are June, July and August. On average, 18 mm (0.7 inches) of precipitation falls during these months.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average precipitation mm (inches) | 36 (1.4) | 50 (2.0) | 70 (2.7) | 84 (3.3) | 44 (1.7) | 24 (1.0) | 18 (0.7) | 11 (0.4) | 50 (2.0) | 44 (1.7) | 87 (3.4) | 69 (2.7) |
| Average precipitation days (≥ 1 mm) | 6 | 5 | 7 | 6 | 5 | 3 | 4 | 2 | 5 | 7 | 9 | 8 |
The sunniest months in Santa Rosa are February, November and December, when the sun shines an average of 11 hours 53 minutes a day. Least sunny months in Santa Rosa: May, June and July receive an average of 7 hours 14 minutes of sunshine daily.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean monthly sunshine hours | 312 | 332 | 322 | 245 | 226 | 211 | 229 | 279 | 277 | 328 | 349 | 387 |
| Mean daily daylight hours | 14h 18m | 13h 24m | 12h 15m | 11h 5m | 10h 8m | 9h 40m | 9h 55m | 10h 46m | 11h 52m | 13h 2m | 14h 4m | 14h 36m |
Santa Rosa experiences the highest level of ultraviolet (UV) radiation in January, November and December, when the maximum UV index can reach values of 13 - 14, which corresponds to the Extreme category of sun exposure. May, June and July are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Santa Rosa UV Index data.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV Index (month maximum) | 14 | 13 | 11 | 7 | 5 | 3 | 4 | 5 | 7 | 10 | 13 | 14 |