July
July · June · August
75climate match
Japan · 1991–2020
Best time to visit
Rumoi.
July leads for comfortable weather in Rumoi: typically 23.3°C by day, 16.4°C at night, with 136 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortJuly
Typical high23.3°C
Typical low16.4°C
Rain in July136 mm
August
August · July · June
47climate match
June
June · May · September
84climate match
The weakest month is January, scoring 5 against July’s 75 — days reach only -1°C, 25° below the 24°C the score treats as ideal.
Month by month
The whole year,
without the guesswork.
The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.
Jan
5-1° / -8.2°
Feb
5-0.3° / -8.2°
Mar
53.3° / -4.1°
Apr
219.6° / 0.9°
May
5015.8° / 6.9°
Jun
7119.4° / 11.9°
Jul
7523.3° / 16.4°
Aug
7024.6° / 17.4°
Sep
6121.5° / 12.7°
Oct
2315.1° / 6.1°
Nov
57.8° / 0.5°
Dec
51.3° / -4.7°
| Month | Day | Night | Rain | Wet days | Sea | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|---|
| January | -1°C | -8.2°C | 113 mm | 22.7 | 6.2°C | 9 h 14 | 5 | Good coverage |
| February | -0.3°C | -8.2°C | 82 mm | 18.8 | 5.0°C | 10 h 24 | 5 | Good coverage |
| March | 3.3°C | -4.1°C | 67 mm | 16 | 5.1°C | 11 h 47 | 5 | Good coverage |
| April | 9.6°C | 0.9°C | 42 mm | 8.3 | 6.8°C | 13 h 22 | 21 | Good coverage |
| May | 15.8°C | 6.9°C | 60 mm | 8.5 | 10.0°C | 14 h 43 | 50 | Good coverage |
| June | 19.4°C | 11.9°C | 58 mm | 8.4 | 14.3°C | 15 h 27 | 71 | Good coverage |
| July | 23.3°C | 16.4°C | 136 mm | 10 | 18.4°C | 15 h 10 | 75 | Good coverage |
| August | 24.6°C | 17.4°C | 149 mm | 11.9 | 21.2°C | 14 h | 70 | Good coverage |
| September | 21.5°C | 12.7°C | 158 mm | 13.4 | 20.6°C | 12 h 27 | 61 | Good coverage |
| October | 15.1°C | 6.1°C | 160 mm | 18.5 | 16.9°C | 10 h 55 | 23 | Good coverage |
| November | 7.8°C | 0.5°C | 157 mm | 21.3 | 12.5°C | 9 h 35 | 5 | Good coverage |
| December | 1.3°C | -4.7°C | 133 mm | 23.1 | 8.7°C | 8 h 55 | 5 | Good coverage |
What has changed
Rumoi runs +1.0°C
on the 1961–1990 baseline.
Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.
Jan
+0.6
Feb
+0.9
Mar
+1.7
Apr
+0.6
May
+1.7
Jun
+1.2
Jul
+1.9
Aug
+1.0
Sep
+1.7
Oct
+0.3
Nov
+0.9
Dec
-0.1
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 8.3°C13 Jan 2023 | -23.4°C25 Jan 1985 | 28 mm25 Jan 2024 | 183 mm1956 · driest 36 mm in 2017 | 75 |
| February | 14.0°C19 Feb 2024 | -22.2°C24 Feb 1978 | 48 mm23 Feb 2004 | 146 mm1952 · driest 31 mm in 1995 | 75 |
| March | 16.8°C28 Mar 2018 | -22.4°C5 Mar 1965 | 28 mm5 Mar 1966 | 121 mm1958 · driest 13 mm in 2025 | 75 |
| April | 24.6°C21 Apr 1998 | -10.1°C7 Apr 1956 | 46 mm23 Apr 1990 | 110 mm1960 · driest 0 mm in 2025 | 75 |
| May | 29.3°C25 May 2019 | -2.8°C2 May 1953 | 60 mm2 May 1998 | 132 mm1961 · driest 0 mm in 2025 | 74 |
| June | 32.0°C5 Jun 2014 | 1.6°C2 Jun 1969 | 80 mm26 Jun 1970 | 191 mm1970 · driest 0 mm in 2025 | 74 |
| July | 33.7°C29 Jul 2018 | 5.0°C4 Jul 1968 | 142 mm24 Jul 2024 | 366 mm1953 · driest 0 mm in 2025 | 75 |
| August | 35.6°C1 Aug 2021 | 7.1°C25 Aug 1962 | 148 mm18 Aug 1973 | 446 mm1981 · driest 0 mm in 2025 | 73 |
| September | 33.1°C18 Sep 2012 | 1.1°C28 Sep 1964 | 120 mm2 Sep 2011 | 385 mm2011 · driest 0 mm in 2025 | 73 |
| October | 28.3°C1 Oct 2022 | -2.4°C23 Oct 2006 | 61 mm1 Oct 1963 | 229 mm2018 · driest 0 mm in 2025 | 74 |
| November | 21.2°C3 Nov 2003 | -9.5°C25 Nov 1967 | 53 mm7 Nov 2024 | 248 mm2013 · driest 0 mm in 2025 | 73 |
| December | 14.0°C10 Dec 1968 | -17.0°C14 Dec 1966 | 37 mm18 Dec 2023 | 255 mm1966 · driest 53 mm in 1997 | 74 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | 0 | 0 | 15 | 2 |
| February | 0 | 0 | 15 | <1 |
| March | 0 | 0 | 15 | <1 |
| April | 0 | 0 | 6 | 1 |
| May | <1 | 0 | <1 | 1 |
| June | 2 | 0 | 0 | 2 |
| July | 7 | <1 | 0 | 3 |
| August | 12 | 1 | 0 | 4 |
| September | 3 | <1 | 0 | 4 |
| October | 0 | 0 | <1 | 4 |
| November | 0 | 0 | 7 | 4 |
| December | 0 | 0 | 14 | 3 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 71% | 8% | 89% | -3.2–0.2°C |
| February | 0% | 63% | 5% | 82% | -2.9–0.9°C |
| March | 0% | 47% | 4% | 60% | 1.6–4.8°C |
| April | 1% | 34% | 6% | 38% | 8.0–11.6°C |
| May | 13% | 32% | 7% | 36% | 13.7–17.0°C |
| June | 26% | 31% | 8% | 34% | 17.5–20.7°C |
| July | 58% | 32% | 12% | 36% | 21.0–25.0°C |
| August | 64% | 35% | 15% | 45% | 22.8–26.6°C |
| September | 43% | 43% | 17% | 59% | 19.6–22.5°C |
| October | 4% | 53% | 17% | 73% | 13.6–16.1°C |
| November | 0% | 66% | 15% | 88% | 5.8–9.0°C |
| December | 0% | 74% | 12% | 94% | -0.6–2.7°C |
A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.
The evidence behind this page
Nearby, measured,
and named.
- Place identity
- GeoNames 2128382
- NOAA station
- JA000047406 · RUMOI
- Station distance
- 1.9 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 16 usable years
- Daylight
- Calculated from latitude 43.93°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Sea temperature
- NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 7 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.