| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 9.1° | — | 46.8mm | 7.8 | 50 |
| February | 10.2° | — | 70.2mm | 8.9 | 51 |
| March | 14.6° | — | 103.8mm | 10.8 | 61 |
| April | 20.3° | — | 134.7mm | 10.4 | 79 |
| May | 25.3° | — | 147.2mm | 9.3 | 81 |
| June | 28.3° | — | 195mm | 11.9 | 71 |
| July | 32.4° | — | 230.5mm | 13.4 | 52 |
| August | 33.9° | — | 175.6mm | 10.5 | 51 |
| September | 29.3° | — | 194.8mm | 11.2 | 68 |
| October | 23.5° | — | 142.3mm | 9.6 | 81 |
| November | 17.6° | — | 76.7mm | 7.7 | 77 |
| December | 11.7° | — | 62.4mm | 8.3 | 57 |
January in Moriyama averages a daily high of 9.1°C. Expect roughly 7.8 wet days totalling 46.8mm. Demanding conditions — pack for it and plan indoor options.
February in Moriyama averages a daily high of 10.2°C. Expect roughly 8.9 wet days totalling 70.2mm. Demanding conditions — pack for it and plan indoor options.
March in Moriyama averages a daily high of 14.6°C. Expect roughly 10.8 wet days totalling 103.8mm. Generally workable, with some weather to plan around.
April in Moriyama averages a daily high of 20.3°C. Expect roughly 10.4 wet days totalling 134.7mm. Comfortable conditions for being outdoors all day.
May in Moriyama averages a daily high of 25.3°C. Expect roughly 9.3 wet days totalling 147.2mm. Comfortable conditions for being outdoors all day.
June in Moriyama averages a daily high of 28.3°C. Expect roughly 11.9 wet days totalling 195mm. Generally workable, with some weather to plan around.
July in Moriyama averages a daily high of 32.4°C. Expect roughly 13.4 wet days totalling 230.5mm. Demanding conditions — pack for it and plan indoor options.
August in Moriyama averages a daily high of 33.9°C. Expect roughly 10.5 wet days totalling 175.6mm. Demanding conditions — pack for it and plan indoor options.
September in Moriyama averages a daily high of 29.3°C. Expect roughly 11.2 wet days totalling 194.8mm. Generally workable, with some weather to plan around.
October in Moriyama averages a daily high of 23.5°C. Expect roughly 9.6 wet days totalling 142.3mm. Comfortable conditions for being outdoors all day.
November in Moriyama averages a daily high of 17.6°C. Expect roughly 7.7 wet days totalling 76.7mm. Comfortable conditions for being outdoors all day.
December in Moriyama averages a daily high of 11.7°C. Expect roughly 8.3 wet days totalling 62.4mm. 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. Moriyama peaks at 81.
Based on 30 years of records, April–May scores highest for comfort in Moriyama, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 33.9°C.
July is the wettest, averaging 230.5mm of rain across roughly 13.4 wet days.
January is the coolest month, with average daily highs around 9.1°C.