| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 15.2° | 5.7° | 56.3mm | 11.2 | 62 |
| February | 16.5° | 6.8° | 66.6mm | 11 | 67 |
| March | 18.5° | 8.2° | 45.4mm | 10.2 | 75 |
| April | 20° | 9.4° | 26mm | 6 | 88 |
| May | 22.2° | 11.5° | 6.7mm | 2.4 | 95 |
| June | 24.6° | 13.5° | 2.9mm | 1 | 98 |
| July | 25° | 14.9° | 0.1mm | 0.1 | 100 |
| August | 25.1° | 15.1° | 0.1mm | 0.2 | 100 |
| September | 25.5° | 14.2° | 2.3mm | 0.9 | 98 |
| October | 23.2° | 11.8° | 15.6mm | 4 | 92 |
| November | 18.5° | 8.3° | 34mm | 9.2 | 77 |
| December | 15.1° | 5.7° | 61.6mm | 10.9 | 63 |
January in Mountain View averages a daily high of 15.2°C with nights around 5.7°C. Expect roughly 11.2 wet days totalling 56.3mm. Generally workable, with some weather to plan around.
February in Mountain View averages a daily high of 16.5°C with nights around 6.8°C. Expect roughly 11 wet days totalling 66.6mm. Generally workable, with some weather to plan around.
March in Mountain View averages a daily high of 18.5°C with nights around 8.2°C. Expect roughly 10.2 wet days totalling 45.4mm. Comfortable conditions for being outdoors all day.
April in Mountain View averages a daily high of 20°C with nights around 9.4°C. Expect roughly 6 wet days totalling 26mm. Comfortable conditions for being outdoors all day.
May in Mountain View averages a daily high of 22.2°C with nights around 11.5°C. Rain is rare — about 2.4 wet days and 6.7mm across the month. Comfortable conditions for being outdoors all day.
June in Mountain View averages a daily high of 24.6°C with nights around 13.5°C. Rain is rare — about 1 wet days and 2.9mm across the month. Comfortable conditions for being outdoors all day.
July in Mountain View averages a daily high of 25°C with nights around 14.9°C. Rain is rare — about 0.1 wet days and 0.1mm across the month. Comfortable conditions for being outdoors all day.
August in Mountain View averages a daily high of 25.1°C with nights around 15.1°C. Rain is rare — about 0.2 wet days and 0.1mm across the month. Comfortable conditions for being outdoors all day.
September in Mountain View averages a daily high of 25.5°C with nights around 14.2°C. Rain is rare — about 0.9 wet days and 2.3mm across the month. Comfortable conditions for being outdoors all day.
October in Mountain View averages a daily high of 23.2°C with nights around 11.8°C. Expect roughly 4 wet days totalling 15.6mm. Comfortable conditions for being outdoors all day.
November in Mountain View averages a daily high of 18.5°C with nights around 8.3°C. Expect roughly 9.2 wet days totalling 34mm. Comfortable conditions for being outdoors all day.
December in Mountain View averages a daily high of 15.1°C with nights around 5.7°C. Expect roughly 10.9 wet days totalling 61.6mm. 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. Mountain View peaks at 100.
Based on 30 years of records, May–October scores highest for comfort in Mountain View, balancing daytime temperature against rainfall.
September is the warmest, averaging a daily high of 25.5°C.
February is the wettest, averaging 66.6mm of rain across roughly 11 wet days.
December is the coolest month, with average daily highs around 15.1°C.