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Home > Weather and Earthquakes > One-week Forecasts

One-week Forecasts: Tokyo

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Prefecture

Updated at 17:00 JST, 27 May 2015

Date 28
Thu
29
Fri
30
Sat
31
Sun
1
Mon
2
Tue
3
Wed
Tokyo

MOSTLY CLOUDY MOSTLY CLOUDY CLEAR, CLOUDY LATER CLOUDY, RAIN LATER MOSTLY CLOUDY PARTLY CLOUDY PARTLY CLOUDY
Probability of
Precipitation (%)
10/10/10/10 30 20 80 40 10 10
Reliability / / B B C A A
Tokyo High (°C) 29
27
(23 - 29)
28
(24 - 31)
25
(22 - 29)
27
(23 - 30)
29
(27 - 33)
29
(27 - 33)
Low (°C) 19
19
(16 - 20)
19
(16 - 20)
20
(18 - 21)
20
(17 - 21)
19
(16 - 20)
20
(18 - 22)
Izu

MOSTLY CLOUDY CLOUDY, OCCASIONAL SCATTERED SHOWERS CLEAR, CLOUDY LATER CLOUDY, RAIN LATER CLOUDY, FREQUENT SCATTERED SHOWERS MOSTLY CLOUDY PARTLY CLOUDY
Probability of
Precipitation (%)
10/10/10/20 60 20 60 80 20 10
Reliability / / A C B B A
Hachijojima High (°C) 24
23
(21 - 24)
23
(22 - 24)
23
(22 - 25)
23
(21 - 24)
24
(22 - 26)
24
(22 - 26)
Low (°C) 16
17
(15 - 18)
18
(16 - 19)
19
(17 - 21)
18
(16 - 20)
17
(15 - 18)
17
(15 - 18)
Ogasawara

SHOWERS THROUGHOUT THE DAY CLOUDY, FREQUENT SCATTERED SHOWERS CLOUDY, FREQUENT SCATTERED SHOWERS CLOUDY, OCCASIONAL SCATTERED SHOWERS CLOUDY CLOUDY, OCCASIONAL SCATTERED SHOWERS CLOUDY, OCCASIONAL SCATTERED SHOWERS
Probability of
Precipitation (%)
50/30/60/60 80 80 50 30 60 60
Reliability / / B C C C C
Chichijima High (°C) 26
27
(26 - 28)
28
(26 - 29)
28
(26 - 29)
28
(27 - 30)
28
(27 - 29)
28
(26 - 30)
Low (°C) 24
24
(22 - 25)
24
(22 - 25)
24
(22 - 26)
24
(22 - 26)
24
(22 - 25)
24
(22 - 25)
Normal Precipitation Low High
Tokyo 10 - 36mm 16.1 °C 24.6 °C
Hachijojima 26 - 68mm 17.0 °C 22.2 °C
Chichijima 20 - 58mm 22.3 °C 26.1 °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.