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Home > Weather and Earthquakes > One-week Forecasts

One-week Forecasts: Tokyo

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Prefecture

Updated at 05:00 JST, 24 September 2014

Date 24
Wed
25
Thu
26
Fri
27
Sat
28
Sun
29
Mon
30
Tue
Tokyo

CLOUDY, RAIN LATER CLOUDY, FREQUENT SCATTERED SHOWERS MOSTLY CLOUDY PARTLY CLOUDY PARTLY CLOUDY CLOUDY MOSTLY CLOUDY
Probability of
Precipitation (%)
-/20/50/50 50/50/50/20 30 20 20 40 30
Reliability / / B A A C C
Tokyo High (°C) 25
27
26
(23 - 29)
25
(23 - 28)
26
(23 - 29)
27
(23 - 30)
25
(22 - 29)
Low (°C) / 23
21
(19 - 22)
18
(16 - 20)
18
(16 - 20)
19
(18 - 21)
20
(18 - 22)
Izu

CLOUDY CLOUDY, RAIN LATER CLOUDY, OCCASIONAL SCATTERED SHOWERS PARTLY CLOUDY MOSTLY CLOUDY CLOUDY, OCCASIONAL SCATTERED SHOWERS CLOUDY, OCCASIONAL SCATTERED SHOWERS
Probability of
Precipitation (%)
-/20/30/30 30/30/50/50 50 30 30 50 50
Reliability / / C C B C C
Hachijojima High (°C) 25
26
25
(23 - 27)
24
(23 - 26)
25
(23 - 27)
26
(24 - 28)
25
(23 - 28)
Low (°C) / 21
20
(18 - 21)
19
(17 - 21)
20
(18 - 22)
20
(18 - 22)
20
(18 - 22)
Ogasawara

PARTLY CLOUDY PARTLY CLOUDY MOSTLY CLOUDY CLOUDY, OCCASIONAL SCATTERED SHOWERS CLOUDY CLOUDY MOSTLY CLOUDY
Probability of
Precipitation (%)
-/10/10/10 10/10/10/10 30 50 40 40 30
Reliability / / A C C C B
Chichijima High (°C) 29
30
30
(29 - 31)
30
(29 - 31)
30
(29 - 31)
30
(29 - 31)
30
(29 - 31)
Low (°C) / 25
25
(24 - 27)
25
(23 - 26)
25
(23 - 26)
25
(24 - 27)
25
(23 - 26)
Normal Precipitation Low High
Tokyo 25 - 59mm 18.8 °C 24.8 °C
Hachijojima 47 - 101mm 20.8 °C 26.1 °C
Chichijima 5 - 28mm 25.1 °C 29.4 °C

One-week forecasts for individual prefectures are issued at 11:00 and 17:00 JST every day. The latest daily forecasts are displayed in the columns for the first and second days. The probability of precipitation for today and tomorrow is displayed with six hours as a unit (i.e., 00 – 06/06 – 12/12 – 18/18 – 24 JST).
Figures shown in parentheses in the low and high temperature rows indicate the ranges of error in degrees Celsius. The reliability for the day is represented as A, B or C in descending order of expected accuracy. The results of precipitation forecast accuracy verification for the period from 1 April 2002 to 31 March 2007 indicate an average accuracy of 86% for A, 72% for B and 56% for C.
Values in the normal precipitation column represent the range of normal cumulative precipitation amounts for the coming seven days, while the figures in the normal low/high temperature columns represent those for the fourth day of the period.