September
Other strong months: August and July
66/100 weather score
Japan · 1991–2020
Best time to visit
Washibetsu
For Washibetsu, September has the most comfortable weather in our climate comparison. Typical daytime highs are 21.7°C, nights average 15.5°C, and rainfall totals about 161 mm. Figures use measured 1991–2020 normals from the nearest eligible NOAA station.
Best all-round monthSeptember
Typical daytime high21.7°C
Typical night-time low15.5°C
September rainfall161 mm
August
Other strong months: September and July
43/100 weather score
June
Other strong months: October and May
71/100 weather score
Make the answer personal
Choose the weather
that suits you.
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 Washibetsu
The lowest comfort score is 5 out of 100. January, February, March and December share that score. In January, that is mainly because days reach only 0.7°C, 23° below the 24°C the score treats as ideal.
Quick answers
Planning a trip to Washibetsu?
These answers come from the same measured monthly climate record shown on this page.
When is the best time to visit Washibetsu?
September is the strongest all-round choice in our temperature-and-rainfall comparison, with a typical daytime high of 21.7°C and 161 mm of rain.
What is the hottest month in Washibetsu?
August is hottest in this record, with a typical daytime high of 24°C and a night-time low of 18.5°C.
Which month has the least rain?
February has the lowest monthly rainfall total at 57 mm.
Is this a weather forecast?
No. These are long-term measured averages from 1991–2020. Check a current forecast before you travel.
Month by month
See how the weather
changes through the year.
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 | 0.7°C | -4.5°C | 62 mm | 15.2 | 6.5°C | 9 h 24 | 5 | Good coverage |
| February | 1.1°C | -4.5°C | 57 mm | 13.9 | 4.0°C | 10 h 29 | 5 | Strong coverage |
| March | 4.8°C | -1.6°C | 60 mm | 11.8 | 4.0°C | 11 h 48 | 5 | Good coverage |
| April | 10.3°C | 2.7°C | 69 mm | 8.7 | 5.6°C | 13 h 18 | 23 | Good coverage |
| May | 15.5°C | 7.3°C | 125 mm | 11.4 | 8.6°C | 14 h 34 | 38 | Good coverage |
| June | 18.4°C | 11.8°C | 113 mm | 9.9 | 13.3°C | 15 h 16 | 59 | Good coverage |
| July | 22°C | 16.2°C | 183 mm | 13 | 17.5°C | 14 h 59 | 62 | Good coverage |
| August | 24°C | 18.5°C | 179 mm | 12 | 20.5°C | 13 h 54 | 65 | Good coverage |
| September | 21.7°C | 15.5°C | 161 mm | 11.8 | 19.9°C | 12 h 26 | 66 | Good coverage |
| October | 16.1°C | 9.2°C | 111 mm | 11.1 | 16.4°C | 10 h 59 | 45 | Good coverage |
| November | 9.6°C | 3.1°C | 99 mm | 15.8 | 12.6°C | 9 h 43 | 10 | Good coverage |
| December | 3°C | -2.3°C | 74 mm | 15.6 | 9.5°C | 9 h 06 | 5 | Good coverage |
What has changed
Recent daytime highs are
1.6°C warmer in Washibetsu.
Each bar shows the difference between the 2011–2025 average daytime high and the 1961–1990 average for the same month at the same station. A blank month does not have enough older observations for a reliable comparison.
Jan
+0.9
Feb
+1.6
Mar
+2.8
Apr
+2.6
May
+2.4
Jun
+1.8
Jul
+2.4
Aug
+1.1
Sep
+1.7
Oct
+1.0
Nov
+1.5
Dec
-0.1
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 9.5°C13 Jan 2023 | -13.4°C12 Jan 1961 | 86 mm31 Jan 1970 | 167 mm1970 · driest 11 mm in 2023 | 74 |
| February | 13.8°C19 Feb 2024 | -12.1°C3 Feb 2001 | 65 mm27 Feb 1972 | 187 mm1958 · driest 9 mm in 1989 | 74 |
| March | 16.7°C28 Mar 2018 | -9.6°C4 Mar 1986 | 86 mm21 Mar 1975 | 143 mm1975 · driest 4 mm in 2011 | 74 |
| April | 23.1°C26 Apr 2014 | -4.8°C1 Apr 1978 | 79 mm16 Apr 1966 | 201 mm1964 · driest 6 mm in 2014 | 74 |
| May | 27.6°C26 May 2019 | 0.4°C4 May 1971 | 97 mm2 May 1998 | 334 mm1955 · driest 5 mm in 2003 | 73 |
| June | 28.7°C26 Jun 2010 | 5.0°C2 Jun 1969 | 95 mm13 Jun 1983 | 325 mm1983 · driest 6 mm in 1973 | 73 |
| July | 31.2°C20 Jul 2021 | 8.5°C3 Jul 1989 | 135 mm23 Jul 2008 | 351 mm2009 · driest 23 mm in 1997 | 74 |
| August | 32.2°C11 Aug 1951 | 11.5°C18 Aug 1971 | 166 mm12 Aug 2010 | 574 mm1981 · driest 23 mm in 1991 | 73 |
| September | 31.0°C9 Sep 2019 | 5.9°C30 Sep 1969 | 119 mm7 Sep 1962 | 356 mm2000 · driest 10 mm in 1995 | 72 |
| October | 24.6°C4 Oct 2021 | -1.0°C25 Oct 1964 | 99 mm5 Oct 1961 | 249 mm1961 · driest 31 mm in 1965 | 73 |
| November | 21.4°C3 Nov 2023 | -7.2°C29 Nov 1971 | 170 mm7 Nov 1975 | 283 mm1975 · driest 22 mm in 2024 | 72 |
| December | 14.4°C4 Dec 1989 | -12.0°C24 Dec 1984 | 58 mm23 Dec 2016 | 136 mm2004 · driest 10 mm in 2020 | 73 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | 0 | 0 | 16 | 1 |
| February | 0 | 0 | 15 | <1 |
| March | 0 | 0 | 13 | 1 |
| April | 0 | 0 | 2 | 2 |
| May | <1 | 0 | 0 | 3 |
| June | <1 | 0 | 0 | 3 |
| July | 6 | <1 | 0 | 4 |
| August | 10 | <1 | 0 | 5 |
| September | 3 | 0 | 0 | 4 |
| October | 0 | 0 | 0 | 3 |
| November | 0 | 0 | 3 | 2 |
| December | 0 | 0 | 13 | 1 |
| Month | Dry days reaching 20°C | Wet days | Days with heavy rain | Weeks with 3+ wet days | Typical high by year |
|---|---|---|---|---|---|
| January | 0% | 42% | 4% | 54% | -1.1–1.9°C |
| February | 0% | 37% | 4% | 44% | -1.4–2.2°C |
| March | 0% | 33% | 6% | 35% | 2.3–6.5°C |
| April | <1% | 31% | 9% | 34% | 8.0–11.5°C |
| May | 8% | 33% | 11% | 34% | 12.9–16.8°C |
| June | 22% | 34% | 13% | 40% | 15.8–20.0°C |
| July | 45% | 36% | 15% | 46% | 19.5–23.7°C |
| August | 59% | 40% | 17% | 50% | 22.0–25.5°C |
| September | 48% | 37% | 16% | 44% | 19.8–22.7°C |
| October | 5% | 36% | 11% | 43% | 14.4–16.9°C |
| November | <1% | 43% | 8% | 57% | 7.3–11.0°C |
| December | 0% | 43% | 4% | 55% | 0.9–4.9°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
Where these figures
come from.
- Place identity
- GeoNames 2127504
- NOAA station
- JA000047423 · MURORAN
- Station distance
- 6.6 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 16 usable years
- Daylight
- Calculated from latitude 42.35°, 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.
Next step
Choose your month.
Then plan the details.
The weather comparison for Washibetsu 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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