Climate averages 1991–2020
Niihama weather
in October.
A mild, wet month: the 6th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
October is a mild month in Niihama: daytime highs average 21.9°C and nights cool to about 15.7°C. By daytime temperature it is the 6th warmest of the 12 months.
Expect about 166 mm of rain on roughly 11 days, which makes October a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 22 min on an average October day.
The nearest other city in this atlas is Saijō (12 km away). In October its highs average 22.4°C, about as warm as Niihama, with 166 mm of rain.
Among the 303 cities listed in Japan, Niihama ranks joint 39th of 303 for the warmest October highs and joint 141st of 303 for the driest October (rainfall, lowest first). The mean October high of those 303 cities is 20.4°C; Niihama is 1.5°C warmer than that mean.
From October to November, average highs fall by 5.2°C to 16.6°C, and monthly rainfall falls from 166 mm to 90 mm.
The annual picture
October in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Niihama climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 9.0°C3.3°C | 3.3°C | 78 | 13.5 | 10.210 h |
| February | 10.1°C3.3°C | 3.3°C | 86 | 12.3 | 10.911 h |
| March | 13.6°C5.8°C | 5.8°C | 122 | 13.4 | 12.012 h |
| April | 18.5°C10.4°C | 10.4°C | 134 | 11.6 | 13.013 h |
| May | 22.8°C15.1°C | 15.1°C | 158 | 11.2 | 13.914 h |
| June | 25.8°C19.5°C | 19.5°C | 249 | 15.1 | 14.414 h |
| July | 29.5°C23.9°C | 23.9°C | 228 | 15.6 | 14.214 h |
| August | 30.6°C24.8°C | 24.8°C | 151 | 13.8 | 13.413 h |
| September | 27.1°C21.4°C | 21.4°C | 216 | 14.1 | 12.412 h |
| October, selected | 21.9°C15.7°C | 15.7°C | 166 | 11.0 | 11.411 h |
| November | 16.6°C10.2°C | 10.2°C | 90 | 9.9 | 10.410 h |
| December | 11.4°C5.5°C | 5.5°C | 90 | 12.8 | 9.910 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
October in nearby cities
- Saijō in OctoberJapan · 12 kmHigh 22.4°C · Low 16.0°C · 166 mm rain
- Shikokuchūō in OctoberJapan · 23 kmHigh 21.8°C · Low 15.4°C · 189 mm rain
- Imabari in OctoberJapan · 31 kmHigh 21.4°C · Low 16.8°C · 148 mm rain
- Shinagawa in OctoberJapan · 45 kmHigh 21.2°C · Low 13.9°C · 168 mm rain
- Kochi in OctoberJapan · 50 kmHigh 22.2°C · Low 14.9°C · 230 mm rain
- Matsuyama in OctoberJapan · 52 kmHigh 22.1°C · Low 16.0°C · 141 mm rain
- Onomichi in OctoberJapan · 52 kmHigh 21.5°C · Low 14.3°C · 105 mm rain
- Mihara in OctoberJapan · 53 kmHigh 21.8°C · Low 14.2°C · 103 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Niihama) is explained once on the Niihama year overview and on the Sources, method and limits page.
Saijō lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.