| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 13.8° | 4° | 72.7mm | 9.9 | 60 |
| February | 16.7° | 4.7° | 56.2mm | 8.4 | 73 |
| March | 19.7° | 6.3° | 47.3mm | 8.8 | 81 |
| April | 23.1° | 8.1° | 28.4mm | 5.3 | 89 |
| May | 27.8° | 11.1° | 12.9mm | 2.8 | 91 |
| June | 32.2° | 14° | 2mm | 0.8 | 78 |
| July | 35° | 15.9° | 0mm | 0.1 | 68 |
| August | 34.3° | 15.5° | 0.1mm | 0.2 | 70 |
| September | 31.9° | 13.9° | 2mm | 0.7 | 79 |
| October | 26.4° | 10° | 18.3mm | 2.7 | 95 |
| November | 18.8° | 5.7° | 35mm | 6.6 | 83 |
| December | 13.8° | 3.6° | 70.7mm | 9.6 | 61 |
January in Manteca averages a daily high of 13.8°C with nights around 4°C. Expect roughly 9.9 wet days totalling 72.7mm. Generally workable, with some weather to plan around.
February in Manteca averages a daily high of 16.7°C with nights around 4.7°C. Expect roughly 8.4 wet days totalling 56.2mm. Generally workable, with some weather to plan around.
March in Manteca averages a daily high of 19.7°C with nights around 6.3°C. Expect roughly 8.8 wet days totalling 47.3mm. Comfortable conditions for being outdoors all day.
April in Manteca averages a daily high of 23.1°C with nights around 8.1°C. Expect roughly 5.3 wet days totalling 28.4mm. Comfortable conditions for being outdoors all day.
May in Manteca averages a daily high of 27.8°C with nights around 11.1°C. Rain is rare — about 2.8 wet days and 12.9mm across the month. Comfortable conditions for being outdoors all day.
June in Manteca averages a daily high of 32.2°C with nights around 14°C. Rain is rare — about 0.8 wet days and 2mm across the month. Comfortable conditions for being outdoors all day.
July in Manteca averages a daily high of 35°C with nights around 15.9°C. Rain is rare — about 0.1 wet days and 0mm across the month. Generally workable, with some weather to plan around.
August in Manteca averages a daily high of 34.3°C with nights around 15.5°C. Rain is rare — about 0.2 wet days and 0.1mm across the month. Generally workable, with some weather to plan around.
September in Manteca averages a daily high of 31.9°C with nights around 13.9°C. Rain is rare — about 0.7 wet days and 2mm across the month. Comfortable conditions for being outdoors all day.
October in Manteca averages a daily high of 26.4°C with nights around 10°C. Rain is rare — about 2.7 wet days and 18.3mm across the month. Comfortable conditions for being outdoors all day.
November in Manteca averages a daily high of 18.8°C with nights around 5.7°C. Expect roughly 6.6 wet days totalling 35mm. Comfortable conditions for being outdoors all day.
December in Manteca averages a daily high of 13.8°C with nights around 3.6°C. Expect roughly 9.6 wet days totalling 70.7mm. 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. Manteca peaks at 95.
Based on 30 years of records, April–May scores highest for comfort in Manteca, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 35°C.
January is the wettest, averaging 72.7mm of rain across roughly 9.9 wet days.
January is the coolest month, with average daily highs around 13.8°C.