| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 15.3° | 5.2° | 96.9mm | 9.6 | 66 |
| February | 16.8° | 5.7° | 77.7mm | 8.4 | 73 |
| March | 18.7° | 7° | 73.3mm | 9.3 | 77 |
| April | 20.7° | 8.2° | 27.7mm | 4.7 | 91 |
| May | 22.8° | 10.3° | 12.1mm | 2.7 | 95 |
| June | 26° | 12.3° | 2.9mm | 0.7 | 99 |
| July | 27.3° | 13.9° | 0mm | 0 | 99 |
| August | 27.2° | 14° | 0.8mm | 0.1 | 99 |
| September | 26.5° | 12.7° | 1.6mm | 0.6 | 99 |
| October | 24° | 10.1° | 26mm | 2.4 | 95 |
| November | 18.3° | 6.8° | 39.8mm | 6.3 | 82 |
| December | 15.2° | 4.9° | 103.7mm | 9.7 | 65 |
January in Palo Alto averages a daily high of 15.3°C with nights around 5.2°C. Expect roughly 9.6 wet days totalling 96.9mm. Generally workable, with some weather to plan around.
February in Palo Alto averages a daily high of 16.8°C with nights around 5.7°C. Expect roughly 8.4 wet days totalling 77.7mm. Generally workable, with some weather to plan around.
March in Palo Alto averages a daily high of 18.7°C with nights around 7°C. Expect roughly 9.3 wet days totalling 73.3mm. Comfortable conditions for being outdoors all day.
April in Palo Alto averages a daily high of 20.7°C with nights around 8.2°C. Expect roughly 4.7 wet days totalling 27.7mm. Comfortable conditions for being outdoors all day.
May in Palo Alto averages a daily high of 22.8°C with nights around 10.3°C. Rain is rare — about 2.7 wet days and 12.1mm across the month. Comfortable conditions for being outdoors all day.
June in Palo Alto averages a daily high of 26°C with nights around 12.3°C. Rain is rare — about 0.7 wet days and 2.9mm across the month. Comfortable conditions for being outdoors all day.
July in Palo Alto averages a daily high of 27.3°C with nights around 13.9°C. Rain is rare — about 0 wet days and 0mm across the month. Comfortable conditions for being outdoors all day.
August in Palo Alto averages a daily high of 27.2°C with nights around 14°C. Rain is rare — about 0.1 wet days and 0.8mm across the month. Comfortable conditions for being outdoors all day.
September in Palo Alto averages a daily high of 26.5°C with nights around 12.7°C. Rain is rare — about 0.6 wet days and 1.6mm across the month. Comfortable conditions for being outdoors all day.
October in Palo Alto averages a daily high of 24°C with nights around 10.1°C. Rain is rare — about 2.4 wet days and 26mm across the month. Comfortable conditions for being outdoors all day.
November in Palo Alto averages a daily high of 18.3°C with nights around 6.8°C. Expect roughly 6.3 wet days totalling 39.8mm. Comfortable conditions for being outdoors all day.
December in Palo Alto averages a daily high of 15.2°C with nights around 4.9°C. Expect roughly 9.7 wet days totalling 103.7mm. Generally workable, with some weather to plan around.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Palo Alto peaks at 99.
Based on 30 years of records, April–October scores highest for comfort in Palo Alto, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 27.3°C.
December is the wettest, averaging 103.7mm of rain across roughly 9.7 wet days.
December is the coolest month, with average daily highs around 15.2°C.