May
Other strong months: October and April
78/100 weather score
Japan · 1991–2020
Best time to visit
Ageo
For Ageo, May has the most comfortable weather in our climate comparison. Typical daytime highs are 25°C, nights average 13.6°C, and rainfall totals about 109 mm. Figures use measured 1991–2020 normals from the nearest eligible NOAA station.
Best all-round monthMay
Typical daytime high25°C
Typical night-time low13.6°C
May rainfall109 mm
April
Other strong months: November and March
79/100 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 Ageo
January has the lowest comfort score at 24 out of 100, compared with May at 78. The main reason is that days reach only 9.9°C, 14° below the 24°C the score treats as ideal, and nights drop to -1.1°C.
Quick answers
Planning a trip to Ageo?
These answers come from the same measured monthly climate record shown on this page.
When is the best time to visit Ageo?
May is the strongest all-round choice in our temperature-and-rainfall comparison, with a typical daytime high of 25°C and 109 mm of rain.
What is the hottest month in Ageo?
August is hottest in this record, with a typical daytime high of 32.5°C and a night-time low of 23.1°C.
Which month has the least rain?
January has the lowest monthly rainfall total at 26 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 | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 9.9°C | -1.1°C | 26 mm | 2.3 | 9 h 58 | 24 | Good coverage |
| February | 10.9°C | -0.3°C | 35 mm | 4.8 | 10 h 49 | 28 | Good coverage |
| March | 14.5°C | 2.9°C | 67 mm | 7.2 | 11 h 51 | 39 | Good coverage |
| April | 20.1°C | 8.2°C | 98 mm | 9 | 13 h 03 | 61 | Good coverage |
| May | 25°C | 13.6°C | 109 mm | 9.2 | 14 h 03 | 78 | Good coverage |
| June | 27.4°C | 18°C | 179 mm | 13.5 | 14 h 35 | 54 | Good coverage |
| July | 31.1°C | 22.1°C | 168 mm | 14.1 | 14 h 23 | 35 | Good coverage |
| August | 32.5°C | 23.1°C | 154 mm | 9.4 | 13 h 31 | 35 | Good coverage |
| September | 28.1°C | 19.4°C | 224 mm | 13.3 | 12 h 22 | 43 | Good coverage |
| October | 22.4°C | 13.1°C | 195 mm | 9.8 | 11 h 13 | 63 | Good coverage |
| November | 17°C | 6.5°C | 62 mm | 5.5 | 10 h 13 | 56 | Good coverage |
| December | 12.1°C | 1.2°C | 41 mm | 4 | 9 h 44 | 34 | Good coverage |
What has changed
Recent daytime highs are
1.9°C warmer in Ageo.
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
+1.2
Feb
+1.5
Mar
+2.9
Apr
+1.9
May
+2.2
Jun
+2.5
Jul
+2.7
Aug
+2.0
Sep
+2.0
Oct
+1.7
Nov
+1.3
Dec
+0.9
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 23.0°C27 Jan 1969 | -10.5°C27 Jan 1954 | 82 mm31 Jan 2009 | 109 mm2009 · driest 0 mm in 1976 | 73 |
| February | 27.0°C11 Feb 1962 | -7.3°C9 Feb 1984 | 119 mm15 Feb 2014 | 189 mm2014 · driest 0 mm in 2026 | 73 |
| March | 26.9°C30 Mar 1998 | -7.7°C6 Mar 1977 | 63 mm1 Mar 1951 | 150 mm1951 · driest 3 mm in 1993 | 74 |
| April | 30.9°C28 Apr 2015 | -2.2°C3 Apr 1963 | 77 mm18 Apr 2020 | 187 mm2008 · driest 0 mm in 2025 | 74 |
| May | 36.2°C27 May 2019 | 1.2°C3 May 1953 | 104 mm3 May 2012 | 282 mm1965 · driest 0 mm in 2025 | 73 |
| June | 39.8°C24 Jun 2011 | 9.1°C4 Jun 1957 | 267 mm28 Jun 1966 | 497 mm1966 · driest 0 mm in 2025 | 73 |
| July | 41.1°C23 Jul 2018 | 11.8°C2 Jul 1976 | 172 mm20 Jul 2011 | 343 mm2022 · driest 0 mm in 2025 | 74 |
| August | 40.9°C16 Aug 2007 | 13.9°C20 Aug 1956 | 212 mm31 Aug 1971 | 419 mm2016 · driest 0 mm in 2025 | 72 |
| September | 39.7°C2 Sep 2000 | 8.6°C29 Sep 1960 | 302 mm12 Sep 1982 | 565 mm1958 · driest 0 mm in 2025 | 72 |
| October | 33.8°C1 Oct 2018 | 2.6°C29 Oct 1971 | 223 mm12 Oct 2019 | 513 mm2004 · driest 0 mm in 2025 | 73 |
| November | 26.7°C2 Nov 2023 | -3.2°C23 Nov 1966 | 69 mm20 Nov 1970 | 170 mm1975 · driest 0 mm in 2025 | 73 |
| December | 26.3°C5 Dec 2004 | -7.8°C31 Dec 1967 | 149 mm27 Dec 2006 | 163 mm2006 · driest 0 mm in 1973 | 73 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | 0 | 0 | 12 | 1 |
| February | 0 | 0 | 10 | <1 |
| March | <1 | 0 | 3 | 2 |
| April | 4 | <1 | <1 | 3 |
| May | 16 | 3 | 0 | 3 |
| June | 21 | 7 | 0 | 4 |
| July | 25 | 18 | 0 | 4 |
| August | 28 | 23 | 0 | 4 |
| September | 21 | 10 | 0 | 5 |
| October | 6 | <1 | 0 | 4 |
| November | <1 | 0 | <1 | 1 |
| December | 0 | 0 | 6 | <1 |
The best month has moved. On the 1961–1990 numbers the strongest month here was May (scoring 84); on 2011–2025 it is October (85). Both are scored the same way, from the same station — only the climate underneath changed.
| Month | Dry days reaching 20°C | Wet days | Days with heavy rain | Weeks with 3+ wet days | Typical high by year |
|---|---|---|---|---|---|
| January | <1% | 10% | 4% | 5% | 8.2–10.9°C |
| February | 1% | 18% | 4% | 15% | 8.6–12.3°C |
| March | 6% | 25% | 8% | 23% | 12.0–15.7°C |
| April | 37% | 30% | 11% | 33% | 17.8–21.3°C |
| May | 62% | 33% | 13% | 40% | 22.3–25.9°C |
| June | 56% | 44% | 18% | 61% | 24.2–28.5°C |
| July | 58% | 42% | 14% | 50% | 27.3–33.1°C |
| August | 68% | 33% | 15% | 41% | 29.9–34.7°C |
| September | 58% | 43% | 19% | 57% | 24.9–29.5°C |
| October | 51% | 33% | 15% | 31% | 20.4–23.2°C |
| November | 16% | 18% | 6% | 13% | 15.3–18.3°C |
| December | <1% | 11% | 3% | 4% | 10.6–13.3°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 1865714
- NOAA station
- JA000047626 · KUMAGAYA
- Station distance
- 28.7 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 16 usable years
- Daylight
- Calculated from latitude 35.97°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- 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 Ageo 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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