Last updated: May 6, 2024
Under the Köppen–Geiger climate classification San Bruno features a hot desert climate (BWh).Temperatures typically range between 16 °C (62 °F) and 31 °C (88 °F) through the year, but rarely can drop to 7 °C (44 °F) or can rise to as high as 38 °C (100 °F).The average annual precipitation amounts to about 109 mm (4.3 inches) and receives 12 rainy days on the 1 mm (0.04 inches) threshold annually.San Bruno enjoys an average of 3649 hours of sunshine throughout the year, and daylight varies from 10 hours 25 minutes to 13 hours 49 minutes per day.
The warmest months in San Bruno are July, August and September, with daily mean temperatures ranging from 29 to 31 °C (85 - 88 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 16 to 17 °C (62 - 63 °F) throughout the day. On average each year, San Bruno experiences 202 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Maximum | 26°C (79°F) | 27°C (80°F) | 30°C (86°F) | 33°C (92°F) | 34°C (93°F) | 37°C (98°F) | 38°C (100°F) | 38°C (100°F) | 37°C (99°F) | 36°C (97°F) | 32°C (89°F) | 27°C (81°F) |
Mean maximum | 25°C (77°F) | 26°C (78°F) | 28°C (82°F) | 32°C (89°F) | 33°C (91°F) | 34°C (94°F) | 36°C (98°F) | 36°C (98°F) | 35°C (95°F) | 34°C (93°F) | 30°C (86°F) | 26°C (78°F) |
Average high | 21°C (69°F) | 21°C (70°F) | 23°C (74°F) | 26°C (80°F) | 28°C (83°F) | 32°C (90°F) | 34°C (93°F) | 34°C (93°F) | 32°C (90°F) | 30°C (86°F) | 26°C (79°F) | 21°C (71°F) |
Daily mean | 16°C (62°F) | 17°C (63°F) | 19°C (66°F) | 22°C (72°F) | 24°C (76°F) | 29°C (84°F) | 31°C (88°F) | 31°C (88°F) | 29°C (85°F) | 26°C (79°F) | 22°C (71°F) | 17°C (63°F) |
Average low | 13°C (55°F) | 13°C (55°F) | 14°C (58°F) | 17°C (63°F) | 19°C (67°F) | 24°C (76°F) | 28°C (82°F) | 28°C (82°F) | 26°C (79°F) | 22°C (72°F) | 18°C (64°F) | 14°C (57°F) |
Mean minimum | 9°C (48°F) | 9°C (48°F) | 10°C (51°F) | 13°C (55°F) | 15°C (60°F) | 20°C (67°F) | 26°C (79°F) | 25°C (78°F) | 22°C (71°F) | 17°C (62°F) | 14°C (58°F) | 10°C (49°F) |
Minimum | 7°C (44°F) | 7°C (45°F) | 9°C (49°F) | 12°C (54°F) | 13°C (56°F) | 18°C (64°F) | 26°C (79°F) | 24°C (75°F) | 18°C (65°F) | 16°C (61°F) | 13°C (56°F) | 9°C (48°F) |
Compare temperature, precipitation, sunshine, UV index in San Bruno, Baja California Sur, Mexico with other places around the world.
San Bruno usually has the most precipitation in August, September and November, with an average of 2 rainy days and 21 mm (0.8 inches) of precipitation per month.The driest months in San Bruno are April, May and June. On average, 0 mm (0.0 inches) of precipitation falls during these months.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Average precipitation mm (inches) | 10 (0.4) | 5 (0.2) | 8 (0.3) | 0 (0.0) | 0 (0.0) | 1 (0.0) | 8 (0.3) | 14 (0.5) | 39 (1.6) | 6 (0.2) | 10 (0.4) | 9 (0.4) |
Average precipitation days (≥ 1 mm) | 1 | 0 | 0 | 0 | 0 | 0 | 2 | 3 | 3 | 1 | 1 | 1 |
The sunniest months in San Bruno are May, June and July, when the sun shines an average of 11 hours 42 minutes a day.Least sunny months in San Bruno: January, February and November receive an average of 8 hours 6 minutes of sunshine daily.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Mean monthly sunshine hours | 216 | 250 | 296 | 325 | 360 | 362 | 354 | 339 | 312 | 304 | 263 | 265 |
Mean daily daylight hours | 10h 37m | 11h 13m | 12h 1m | 12h 49m | 13h 29m | 13h 49m | 13h 38m | 13h 2m | 12h 16m | 11h 28m | 10h 46m | 10h 25m |
San Bruno experiences the highest level of ultraviolet (UV) radiation in April, August and September, 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 7. For more detailed information, check out our hourly San Bruno UV Index data.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
UV Index (month maximum) | 6 | 8 | 10 | 12 | 12 | 12 | 12 | 12 | 12 | 9 | 7 | 5 |