| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 32.7° | 23.2° | 18.7mm | 1.3 | 75 |
| February | 33.6° | 25.1° | 30.7mm | 2.3 | 69 |
| March | 34.8° | 26.6° | 35.2mm | 4.1 | 61 |
| April | 35.8° | 27.7° | 79.6mm | 5 | 55 |
| May | 35.1° | 26.8° | 230.1mm | 15.6 | 38 |
| June | 34.2° | 26° | 201.9mm | 17.9 | 41 |
| July | 33.5° | 26.3° | 254.5mm | 21.6 | 44 |
| August | 33.4° | 25.6° | 276.1mm | 20.5 | 44 |
| September | 33.1° | 25.3° | 368.2mm | 23.4 | 46 |
| October | 33.2° | 25.1° | 282mm | 18 | 45 |
| November | 33.2° | 25° | 56.2mm | 5.3 | 65 |
| December | 32.3° | 23.1° | 8.7mm | 1.6 | 76 |
January in Phaya Thai averages a daily high of 32.7°C with nights around 23.2°C. Rain is rare — about 1.3 wet days and 18.7mm across the month. Comfortable conditions for being outdoors all day.
February in Phaya Thai averages a daily high of 33.6°C with nights around 25.1°C. Rain is rare — about 2.3 wet days and 30.7mm across the month. Generally workable, with some weather to plan around.
March in Phaya Thai averages a daily high of 34.8°C with nights around 26.6°C. Expect roughly 4.1 wet days totalling 35.2mm. Generally workable, with some weather to plan around.
April in Phaya Thai averages a daily high of 35.8°C with nights around 27.7°C. Expect roughly 5 wet days totalling 79.6mm. Generally workable, with some weather to plan around.
May in Phaya Thai averages a daily high of 35.1°C with nights around 26.8°C. Expect roughly 15.6 wet days totalling 230.1mm. Demanding conditions — pack for it and plan indoor options.
June in Phaya Thai averages a daily high of 34.2°C with nights around 26°C. Expect roughly 17.9 wet days totalling 201.9mm. Demanding conditions — pack for it and plan indoor options.
July in Phaya Thai averages a daily high of 33.5°C with nights around 26.3°C. Expect roughly 21.6 wet days totalling 254.5mm. Demanding conditions — pack for it and plan indoor options.
August in Phaya Thai averages a daily high of 33.4°C with nights around 25.6°C. Expect roughly 20.5 wet days totalling 276.1mm. Demanding conditions — pack for it and plan indoor options.
September in Phaya Thai averages a daily high of 33.1°C with nights around 25.3°C. Expect roughly 23.4 wet days totalling 368.2mm. Demanding conditions — pack for it and plan indoor options.
October in Phaya Thai averages a daily high of 33.2°C with nights around 25.1°C. Expect roughly 18 wet days totalling 282mm. Demanding conditions — pack for it and plan indoor options.
November in Phaya Thai averages a daily high of 33.2°C with nights around 25°C. Expect roughly 5.3 wet days totalling 56.2mm. Generally workable, with some weather to plan around.
December in Phaya Thai averages a daily high of 32.3°C with nights around 23.1°C. Rain is rare — about 1.6 wet days and 8.7mm across the month. 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. Phaya Thai peaks at 76.
Based on 30 years of records, December–February scores highest for comfort in Phaya Thai, balancing daytime temperature against rainfall.
April is the warmest, averaging a daily high of 35.8°C.
September is the wettest, averaging 368.2mm of rain across roughly 23.4 wet days.
December is the coolest month, with average daily highs around 32.3°C.