Best year time to visit Isumi

General weather information about Isumi

Average annual temperature is 17.5 °C

Absolute maximum temperature: 33.9 °C

Absolute minimum temperature: -2.8 °C

Number of sunny days: 137

Number of rainy days: 227

Number of snow days: 1

Average annual precipitation: 1522 mm

Look at detailed online map of Isumi

* Weather data for Isumi Japan is based on climate observations for 2023 year

Isumi air temperature forecast for each month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Absolute maximum temperature (°C) 16.3 19.1 25.1 24.8 26.8 30.1 33 33.9 31.8 30.6 25.1 22.7
Average daytime temperature (°C) 10.2 11.6 16.1 19.1 21 25.1 29.9 30.9 28.8 22.7 19.2 14.3
Average temperature (°C) 6.5 8.2 13.1 16 18.3 22.1 26.5 27.6 26.1 19 15.7 10.5
Average night temperature (°C) 3.2 4.6 10.2 13.3 15.9 19.9 23.7 25.3 24 15.5 12.8 7
Absolute minimum temperature (°C) -2.8 -0.3 2.8 6.9 11.4 16.6 20.7 23 20.9 12.1 6.4 0.9

Isumi monthly weather indicators

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daylight maximum duration (h) 10.5 11.4 12.5 13.6 14.4 14.5 14.5 13.9 12.9 11.8 10.8 10
Daylight mean duration (h) 10.1 10.9 12 13.1 14 14.5 14.3 13.5 12.4 11.3 10.3 9.8
Daylight minimum duration (h) 9.8 10.5 11.4 12.6 13.6 14.4 14 13 11.9 10.8 10 9.8
Sunshine mean duration (h) 6.7 7.6 8 9.2 9.4 7.8 10.9 11.7 9.1 8.9 7.4 7.4
Precipitation (mm) 60 99 170 179 137 256 33 110 181 166 82 47
Sunny days 13 13 7 12 12 5 18 4 4 14 15 20
Rainy days 17 15 24 18 19 25 13 27 26 17 15 11
Snow days 1

Isumi - weather forecast by months

January February March April May June July August September October November December

Best time to visit Isumi:

The best time to visit Isumi during the most sunny months:

  • August — 11.7(h)

The largest precipitation sum in Isumi is at

  • March — 170(mm)
  • April — 179(mm)
  • June — 256(mm)
  • September — 181(mm)
  • October — 166(mm)

Weather forecast in the closest to Isumi admin centers