October
Other strong months: November and April
Japan · 1991–2020
For Aira, October has the most comfortable weather in our climate comparison. Typical daytime highs are 25.8°C, nights average 17.2°C, and rainfall totals about 121 mm. Figures use measured 1991–2020 normals from the nearest eligible NOAA station.
Other strong months: November and April
Other strong months: September and May
Other strong months: December and April
Make the answer personal
Set the daytime temperature and rainfall you are comfortable with. We will show only the months that meet every choice, using the measured 1991–2020 averages below.
2 months fit your choices for Aira
The lowest comfort score is 5 out of 100. June and July share that score. In June, that is mainly because 705 mm of rain falls.
Quick answers
These answers come from the same measured monthly climate record shown on this page.
October is the strongest all-round choice in our temperature-and-rainfall comparison, with a typical daytime high of 25.8°C and 121 mm of rain.
August is hottest in this record, with a typical daytime high of 32.7°C and a night-time low of 25.7°C.
January has the lowest monthly rainfall total at 87 mm.
No. These are long-term measured averages from 1991–2020. Check a current forecast before you travel.
Month by month
The bars combine daytime temperature, night-time temperature and rainfall. The figures are measured historical averages, not a forecast for a particular trip.
| Month | Day | Night | Rain | Wet days | Sea | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|---|
| January | 12.9°C | 4.1°C | 87 mm | 9.1 | 17.3°C | 10 h 17 | 31 | Good coverage |
| February | 14.5°C | 4.7°C | 126 mm | 9.4 | 16.3°C | 11 h 00 | 32 | Good coverage |
| March | 17.6°C | 8°C | 179 mm | 13.2 | 16.7°C | 11 h 53 | 37 | Good coverage |
| April | 21.8°C | 12.3°C | 182 mm | 9.7 | 17.9°C | 12 h 55 | 61 | Good coverage |
| May | 25.5°C | 16.9°C | 257 mm | 11.7 | 20.0°C | 13 h 45 | 53 | Good coverage |
| June | 27.7°C | 21°C | 705 mm | 20 | 22.6°C | 14 h 13 | 5 | Good coverage |
| July | 32°C | 25°C | 473 mm | 15.5 | 25.8°C | 14 h 02 | 5 | Good coverage |
| August | 32.7°C | 25.7°C | 276 mm | 13 | 27.7°C | 13 h 19 | 9 | Good coverage |
| September | 30.3°C | 22.9°C | 273 mm | 12.1 | 26.7°C | 12 h 19 | 23 | Good coverage |
| October | 25.8°C | 17.2°C | 121 mm | 8.1 | 24.2°C | 11 h 20 | 73 | Good coverage |
| November | 20.6°C | 11.7°C | 125 mm | 8.8 | 21.6°C | 10 h 29 | 65 | Good coverage |
| December | 15.5°C | 6.1°C | 110 mm | 8.7 | 19.0°C | 10 h 05 | 40 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 22.8°C27 Jan 1969 | -5.6°C25 Jan 1960 | 74 mm8 Jan 1961 | 201 mm1963 · driest 0 mm in 2026 | 75 |
| February | 23.8°C25 Feb 2011 | -5.8°C17 Feb 1977 | 93 mm6 Feb 1959 | 284 mm1959 · driest 0 mm in 2026 | 73 |
| March | 27.7°C26 Mar 2025 | -3.8°C15 Mar 1957 | 122 mm30 Mar 1977 | 351 mm1987 · driest 0 mm in 2026 | 74 |
| April | 30.2°C23 Apr 2004 | -0.2°C2 Apr 1972 | 201 mm24 Apr 1998 | 457 mm1957 · driest 0 mm in 2025 | 75 |
| May | 31.7°C27 May 2015 | 6.9°C13 May 1958 | 187 mm27 May 2000 | 559 mm1980 · driest 0 mm in 2025 | 74 |
| June | 34.5°C30 Jun 1985 | 12.0°C12 Jun 1951 | 221 mm4 Jun 2021 | 1289 mm2015 · driest 0 mm in 2025 | 74 |
| July | 37.2°C28 Jul 2026 | 17.3°C7 Jul 1968 | 258 mm28 Jul 1989 | 1030 mm1993 · driest 0 mm in 2025 | 74 |
| August | 36.7°C18 Aug 2002 | 16.5°C31 Aug 1968 | 326 mm11 Aug 1995 | 804 mm2021 · driest 0 mm in 2025 | 74 |
| September | 35.7°C8 Sep 2009 | 9.3°C30 Sep 1965 | 181 mm3 Sep 1993 | 515 mm1973 · driest 0 mm in 2025 | 74 |
| October | 33.4°C12 Oct 2025 | 2.6°C31 Oct 1970 | 157 mm1 Oct 2008 | 361 mm1987 · driest 0 mm in 2025 | 74 |
| November | 29.5°C6 Nov 2003 | -0.6°C22 Nov 1966 | 115 mm24 Nov 1960 | 222 mm1952 · driest 0 mm in 2025 | 73 |
| December | 24.7°C1 Dec 1992 | -3.6°C25 Dec 1973 | 174 mm4 Dec 2018 | 245 mm2018 · driest 0 mm in 2025 | 74 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | 0 | 0 | 1 | 2 |
| February | 0 | 0 | <1 | 3 |
| March | <1 | 0 | 0 | 5 |
| April | 4 | 0 | 0 | 5 |
| May | 19 | <1 | 0 | 5 |
| June | 23 | 5 | 0 | 10 |
| July | 29 | 24 | 0 | 6 |
| August | 30 | 28 | 0 | 5 |
| September | 29 | 18 | 0 | 5 |
| October | 20 | 1 | 0 | 3 |
| November | 2 | 0 | 0 | 3 |
| December | 0 | 0 | <1 | 3 |
| Month | Dry days reaching 20°C | Wet days | Days with heavy rain | Weeks with 3+ wet days | Typical high by year |
|---|---|---|---|---|---|
| January | <1% | 34% | 10% | 38% | 10.7–14.2°C |
| February | 2% | 37% | 14% | 44% | 11.6–16.0°C |
| March | 11% | 42% | 19% | 52% | 15.6–18.6°C |
| April | 45% | 41% | 23% | 53% | 20.2–22.7°C |
| May | 59% | 42% | 23% | 52% | 23.8–26.0°C |
| June | 46% | 56% | 35% | 72% | 26.2–28.5°C |
| July | 58% | 44% | 24% | 52% | 30.2–32.9°C |
| August | 61% | 40% | 20% | 49% | 31.5–33.4°C |
| September | 61% | 40% | 20% | 47% | 28.4–31.2°C |
| October | 71% | 28% | 11% | 28% | 24.2–26.8°C |
| November | 40% | 29% | 12% | 27% | 18.7–21.8°C |
| December | 4% | 30% | 10% | 34% | 13.3–16.5°C |
A dry day reaching 20°C records under 1 mm of rain. A wet day records at least 1 mm, while a heavy-rain day records at least 10 mm. The weekly figure is the share of seven-day periods containing three or more wet days. The final column shows the middle 80% of average daytime highs recorded for that month in individual years; a wider range means conditions have varied more from one year to another.
The evidence behind this page
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The weather comparison for Aira is based on climate evidence, not payments from travel companies. Flight, accommodation and activity links will be clearly labelled when they are added; there are no booking offers on this page today.
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