| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 13.9° | 2° | 68.5mm | 4.6 | 71 |
| February | 16° | 4° | 83mm | 6.6 | 74 |
| March | 20.2° | 8.6° | 96.6mm | 7.7 | 85 |
| April | 24.1° | 12.7° | 90.5mm | 6.3 | 87 |
| May | 28.2° | 17.7° | 115.7mm | 7.8 | 80 |
| June | 32.4° | 22° | 102mm | 7.3 | 64 |
| July | 35.1° | 23.9° | 59.7mm | 4.9 | 58 |
| August | 35° | 23.6° | 60.6mm | 4.9 | 58 |
| September | 31° | 19.9° | 78.4mm | 5.7 | 73 |
| October | 25.5° | 13.5° | 110.4mm | 6 | 88 |
| November | 19.2° | 7.5° | 65.9mm | 5.6 | 86 |
| December | 14.2° | 2.8° | 68.3mm | 5.4 | 71 |
January in Grand Prairie averages a daily high of 13.9°C with nights around 2°C. Expect roughly 4.6 wet days totalling 68.5mm. Generally workable, with some weather to plan around.
February in Grand Prairie averages a daily high of 16°C with nights around 4°C. Expect roughly 6.6 wet days totalling 83mm. Generally workable, with some weather to plan around.
March in Grand Prairie averages a daily high of 20.2°C with nights around 8.6°C. Expect roughly 7.7 wet days totalling 96.6mm. Comfortable conditions for being outdoors all day.
April in Grand Prairie averages a daily high of 24.1°C with nights around 12.7°C. Expect roughly 6.3 wet days totalling 90.5mm. Comfortable conditions for being outdoors all day.
May in Grand Prairie averages a daily high of 28.2°C with nights around 17.7°C. Expect roughly 7.8 wet days totalling 115.7mm. Comfortable conditions for being outdoors all day.
June in Grand Prairie averages a daily high of 32.4°C with nights around 22°C. Expect roughly 7.3 wet days totalling 102mm. Generally workable, with some weather to plan around.
July in Grand Prairie averages a daily high of 35.1°C with nights around 23.9°C. Expect roughly 4.9 wet days totalling 59.7mm. Generally workable, with some weather to plan around.
August in Grand Prairie averages a daily high of 35°C with nights around 23.6°C. Expect roughly 4.9 wet days totalling 60.6mm. Generally workable, with some weather to plan around.
September in Grand Prairie averages a daily high of 31°C with nights around 19.9°C. Expect roughly 5.7 wet days totalling 78.4mm. Generally workable, with some weather to plan around.
October in Grand Prairie averages a daily high of 25.5°C with nights around 13.5°C. Expect roughly 6 wet days totalling 110.4mm. Comfortable conditions for being outdoors all day.
November in Grand Prairie averages a daily high of 19.2°C with nights around 7.5°C. Expect roughly 5.6 wet days totalling 65.9mm. Comfortable conditions for being outdoors all day.
December in Grand Prairie averages a daily high of 14.2°C with nights around 2.8°C. Expect roughly 5.4 wet days totalling 68.3mm. 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. Grand Prairie peaks at 88.
Based on 30 years of records, March–May scores highest for comfort in Grand Prairie, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 35.1°C.
May is the wettest, averaging 115.7mm of rain across roughly 7.8 wet days.
January is the coolest month, with average daily highs around 13.9°C.