| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 21.1° | 6° | 59.3mm | 6 | 88 |
| February | 21° | 6.7° | 66.1mm | 6.8 | 86 |
| March | 22° | 8.7° | 44.8mm | 5.6 | 89 |
| April | 23.9° | 10.5° | 18.4mm | 3.6 | 93 |
| May | 24.7° | 13.2° | 8.4mm | 2.4 | 95 |
| June | 27.6° | 15.3° | 1mm | 0.5 | 97 |
| July | 30.8° | 17.6° | 3.9mm | 0.5 | 84 |
| August | 31.7° | 18.4° | 2.3mm | 0.4 | 80 |
| September | 31.1° | 17.1° | 2.4mm | 0.7 | 82 |
| October | 27.8° | 13.1° | 14.3mm | 1.8 | 93 |
| November | 24.5° | 8.5° | 27.7mm | 3.4 | 93 |
| December | 20.9° | 6° | 51.3mm | 5.4 | 89 |
January in La Mesa averages a daily high of 21.1°C with nights around 6°C. Expect roughly 6 wet days totalling 59.3mm. Comfortable conditions for being outdoors all day.
February in La Mesa averages a daily high of 21°C with nights around 6.7°C. Expect roughly 6.8 wet days totalling 66.1mm. Comfortable conditions for being outdoors all day.
March in La Mesa averages a daily high of 22°C with nights around 8.7°C. Expect roughly 5.6 wet days totalling 44.8mm. Comfortable conditions for being outdoors all day.
April in La Mesa averages a daily high of 23.9°C with nights around 10.5°C. Expect roughly 3.6 wet days totalling 18.4mm. Comfortable conditions for being outdoors all day.
May in La Mesa averages a daily high of 24.7°C with nights around 13.2°C. Rain is rare — about 2.4 wet days and 8.4mm across the month. Comfortable conditions for being outdoors all day.
June in La Mesa averages a daily high of 27.6°C with nights around 15.3°C. Rain is rare — about 0.5 wet days and 1mm across the month. Comfortable conditions for being outdoors all day.
July in La Mesa averages a daily high of 30.8°C with nights around 17.6°C. Rain is rare — about 0.5 wet days and 3.9mm across the month. Comfortable conditions for being outdoors all day.
August in La Mesa averages a daily high of 31.7°C with nights around 18.4°C. Rain is rare — about 0.4 wet days and 2.3mm across the month. Comfortable conditions for being outdoors all day.
September in La Mesa averages a daily high of 31.1°C with nights around 17.1°C. Rain is rare — about 0.7 wet days and 2.4mm across the month. Comfortable conditions for being outdoors all day.
October in La Mesa averages a daily high of 27.8°C with nights around 13.1°C. Rain is rare — about 1.8 wet days and 14.3mm across the month. Comfortable conditions for being outdoors all day.
November in La Mesa averages a daily high of 24.5°C with nights around 8.5°C. Expect roughly 3.4 wet days totalling 27.7mm. Comfortable conditions for being outdoors all day.
December in La Mesa averages a daily high of 20.9°C with nights around 6°C. Expect roughly 5.4 wet days totalling 51.3mm. Comfortable conditions for being outdoors all day.
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. La Mesa peaks at 97.
Based on 30 years of records, March–June scores highest for comfort in La Mesa, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 31.7°C.
February is the wettest, averaging 66.1mm of rain across roughly 6.8 wet days.
December is the coolest month, with average daily highs around 20.9°C.