Last updated: March 2, 2024
Under the Köppen–Geiger climate classification Santa Rosa features a hot desert climate (BWh). Temperatures typically range between 13 °C (55 °F) and 33 °C (91 °F) through the year, but rarely can drop to -1 °C (30 °F) or can rise to as high as 46 °C (116 °F). The average annual precipitation amounts to about 164 mm (6.5 inches) and receives 28 rainy days on the 1 mm (0.04 inches) threshold annually. Santa Rosa enjoys an average of 3657 hours of sunshine throughout the year, and daylight varies from 10 hours 3 minutes to 14 hours 13 minutes per day.
The warmest months in Santa Rosa are June, July and August, with daily mean temperatures ranging from 32 to 33 °C (89 - 91 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 13 to 14 °C (55 - 58 °F) throughout the day. On average each year, Santa Rosa experiences 218 days above 25 °C (77.0 °F) and 1 days below 0 °C (32.0 °F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum | 28°C (83°F) |
30°C (87°F) |
34°C (93°F) |
38°C (101°F) |
40°C (105°F) |
46°C (116°F) |
46°C (114°F) |
44°C (111°F) |
44°C (111°F) |
39°C (103°F) |
35°C (95°F) |
28°C (82°F) |
| Mean maximum | 25°C (78°F) |
27°C (81°F) |
31°C (88°F) |
36°C (97°F) |
38°C (101°F) |
42°C (108°F) |
44°C (111°F) |
43°C (109°F) |
41°C (106°F) |
36°C (97°F) |
31°C (89°F) |
26°C (78°F) |
| Average high | 19°C (67°F) |
21°C (69°F) |
24°C (76°F) |
30°C (86°F) |
33°C (91°F) |
39°C (102°F) |
39°C (102°F) |
39°C (102°F) |
36°C (97°F) |
31°C (88°F) |
26°C (79°F) |
19°C (67°F) |
| Daily mean | 13°C (55°F) |
14°C (58°F) |
18°C (64°F) |
23°C (73°F) |
26°C (79°F) |
32°C (89°F) |
33°C (91°F) |
33°C (91°F) |
30°C (86°F) |
24°C (76°F) |
19°C (66°F) |
13°C (56°F) |
| Average low | 7°C (45°F) |
8°C (46°F) |
11°C (52°F) |
15°C (59°F) |
18°C (64°F) |
23°C (74°F) |
27°C (81°F) |
27°C (81°F) |
24°C (75°F) |
17°C (63°F) |
12°C (54°F) |
8°C (46°F) |
| Mean minimum | 1°C (34°F) |
1°C (34°F) |
5°C (41°F) |
9°C (49°F) |
12°C (54°F) |
18°C (65°F) |
22°C (71°F) |
23°C (75°F) |
18°C (64°F) |
9°C (48°F) |
7°C (44°F) |
1°C (34°F) |
| Minimum | -0°C (31°F) |
-1°C (30°F) |
3°C (37°F) |
8°C (46°F) |
10°C (49°F) |
18°C (64°F) |
20°C (69°F) |
22°C (72°F) |
13°C (56°F) |
4°C (39°F) |
3°C (38°F) |
-1°C (31°F) |
Compare temperature, precipitation, sunshine, UV index in Santa Rosa, Arizona, United States with other places around the world.
Santa Rosa usually has the most precipitation in January, July and August, with an average of 5 rainy days and 25 mm (1.0 inches) of precipitation per month. The driest months in Santa Rosa are April, May and October. On average, 3 mm (0.1 inches) of precipitation falls during these months.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average precipitation mm (inches) | 18 (0.7) | 18 (0.7) | 13 (0.5) | 2 (0.1) | 1 (0.0) | 7 (0.3) | 34 (1.3) | 24 (0.9) | 15 (0.6) | 7 (0.3) | 8 (0.3) | 18 (0.7) |
| Average precipitation days (≥ 1 mm) | 2 | 3 | 2 | 0 | 0 | 0 | 8 | 6 | 2 | 1 | 1 | 3 |
The sunniest months in Santa Rosa are May, June and July, when the sun shines an average of 11 hours 57 minutes a day. Least sunny months in Santa Rosa: January, February and December receive an average of 7 hours 37 minutes of sunshine daily.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean monthly sunshine hours | 204 | 245 | 307 | 333 | 372 | 372 | 355 | 346 | 316 | 299 | 260 | 244 |
| Mean daily daylight hours | 10h 17m | 11h 2m | 12h 0m | 12h 59m | 13h 49m | 14h 13m | 13h 59m | 13h 15m | 12h 18m | 11h 19m | 10h 28m | 10h 3m |
Santa Rosa experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 12 - 12, which corresponds to the Extreme category of sun exposure. January, November and December are in the Moderate / High exposure category. In these months, the maximum values of the UV index do not exceed 6. 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) | 5 | 7 | 9 | 11 | 12 | 12 | 12 | 11 | 10 | 8 | 6 | 4 |
Discover in-depth weather details for every month in Santa Rosa. Click through the links below for comprehensive overviews of temperature trends, precipitation levels, sunshine hours, and solar UV radiation specifics. Whether planning a visit or simply curious about Santa Rosa's climate nuances, these monthly breakdowns provide the information you need for an informed understanding of what to expect throughout the year.
Each link leads to a detailed account of the typical weather conditions for that month, providing both locals and tourists with vital information to plan their daily activities, wardrobe, and travel itineraries accordingly.