Sendai climate: monthly averages: annual mean temperature 9.3 C; warmest month Aug (22.5 C); coldest month Jan (-3.3 C).
Annual mean temperature: 9.3 C
Warmest month: Aug (22.5 C)
Coldest month: Jan (-3.3 C)
Wettest month: Jul (6.59 mm/day)
All-time record high: 35.8 C
All-time record low: -16.1 C
Everything below is collected in one spot so you do not have to cross-check Sendai climate: monthly averages by hand. The gap between Jan and Aug is 25.8 C here: -3.3 C against 22.5 C. No month dominates: the wettest is Jul at 6.59 mm/day, the driest Feb at 2.85 mm/day. Taken together that is roughly 1,540 mm of rain a year for the grid cell. The build runs on a schedule and caches the last good response, so the numbers stay put even when the upstream API is having a bad day. Exact monthly values are in the table; links below cover adjacent locations and years.
Annual mean temperature 9.3 C
Warmest month Aug (22.5 C)
Coldest month Jan (-3.3 C)
Wettest month Jul (6.59 mm/day)
All-time record high 35.8 C
All-time record low -16.1 C
Annual precipitation 1,544 mm / year
Coordinates 38.26667, 140.86667
Population 1,096,704
Average monthly temperature and rainfall in Sendai
Month
Mean temp (C)
Rain (mm/day)
Record high (C)
Record low (C)
Jan
-3.3
4.05
7.5
-13.8
Feb
-3.1
2.85
15.6
-16.1
Mar
0.7
3.00
17.1
-14.8
Apr
6.8
3.06
23.8
-4.7
May
12.9
3.04
30.1
-0.8
Jun
17.4
3.88
31.0
4.2
Jul
21.4
6.59
35.5
11.2
Aug
22.5
5.42
35.8
11.7
Sep
18.3
4.72
32.6
2.2
Oct
11.8
4.95
27.9
-1.1
Nov
5.5
4.24
21.1
-5.7
Dec
-0.3
4.85
17.6
-11.6
What the Sendai climate table shows
Values are multi-decadal climatological averages for the 38.26667, 140.86667 grid cell, not a single year. Rain is the daily mean, so a value of 2.00 mm/day is about 60 mm across a 30-day month. Averages smooth over extremes, so use them for planning rather than for what to pack for next Tuesday.
Frequently asked questions
Why do the numbers differ from a weather app?
An app shows one location on one day. These are long-run averages, so they smooth out single hot or cold spells.
How much rain is 6.59 mm/day in a month?
Rain is recorded as a daily mean, so 6.59 mm/day is roughly 200 mm across a 30-day month.