| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 5.6° | — | 34.9mm | 6.7 | 41 |
| February | 6.6° | — | 36.7mm | 8 | 41 |
| March | 10° | — | 74.1mm | 8.9 | 50 |
| April | 16° | — | 101.9mm | 9.4 | 68 |
| May | 20.8° | — | 112mm | 10.2 | 80 |
| June | 23.4° | — | 139.4mm | 11.9 | 76 |
| July | 27.4° | — | 179.8mm | 16.6 | 68 |
| August | 28.6° | — | 142.1mm | 13 | 68 |
| September | 25.1° | — | 175.7mm | 12.9 | 74 |
| October | 20° | — | 145.6mm | 9.7 | 81 |
| November | 14° | — | 61.9mm | 7.2 | 66 |
| December | 8.5° | — | 52.1mm | 8.1 | 47 |
January in Shiogama averages a daily high of 5.6°C. Expect roughly 6.7 wet days totalling 34.9mm. Demanding conditions — pack for it and plan indoor options.
February in Shiogama averages a daily high of 6.6°C. Expect roughly 8 wet days totalling 36.7mm. Demanding conditions — pack for it and plan indoor options.
March in Shiogama averages a daily high of 10°C. Expect roughly 8.9 wet days totalling 74.1mm. Demanding conditions — pack for it and plan indoor options.
April in Shiogama averages a daily high of 16°C. Expect roughly 9.4 wet days totalling 101.9mm. Generally workable, with some weather to plan around.
May in Shiogama averages a daily high of 20.8°C. Expect roughly 10.2 wet days totalling 112mm. Comfortable conditions for being outdoors all day.
June in Shiogama averages a daily high of 23.4°C. Expect roughly 11.9 wet days totalling 139.4mm. Comfortable conditions for being outdoors all day.
July in Shiogama averages a daily high of 27.4°C. Expect roughly 16.6 wet days totalling 179.8mm. Generally workable, with some weather to plan around.
August in Shiogama averages a daily high of 28.6°C. Expect roughly 13 wet days totalling 142.1mm. Generally workable, with some weather to plan around.
September in Shiogama averages a daily high of 25.1°C. Expect roughly 12.9 wet days totalling 175.7mm. Generally workable, with some weather to plan around.
October in Shiogama averages a daily high of 20°C. Expect roughly 9.7 wet days totalling 145.6mm. Comfortable conditions for being outdoors all day.
November in Shiogama averages a daily high of 14°C. Expect roughly 7.2 wet days totalling 61.9mm. Generally workable, with some weather to plan around.
December in Shiogama averages a daily high of 8.5°C. Expect roughly 8.1 wet days totalling 52.1mm. Demanding conditions — pack for it and plan indoor options.
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. Shiogama peaks at 81.
Based on 30 years of records, May–June scores highest for comfort in Shiogama, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 28.6°C.
July is the wettest, averaging 179.8mm of rain across roughly 16.6 wet days.
January is the coolest month, with average daily highs around 5.6°C.