This is the short version of Vientiane climate: monthly averages, with the monthly detail underneath. The gap between Dec and Apr is 9.8 C here: 20.7 C against 30.5 C. Precipitation peaks in Aug (7.92 mm/day) and bottoms out in Dec (0.19 mm/day), so a 41.7x difference between the two. Taken together that is roughly 1,208 mm of rain a year for the grid cell. Because each page is rebuilt independently, one unavailable upstream never takes the rest of the site down. Use the table for exact numbers, or the related pages below for neighbouring locations and periods.
Annual mean temperature 25.9 C
Warmest month Apr (30.5 C)
Coldest month Dec (20.7 C)
Wettest month Aug (7.92 mm/day)
All-time record high 44.4 C
All-time record low 5.6 C
Annual precipitation 1,215 mm / year
Coordinates 17.9667, 102.6
Population 840,940
Average monthly temperature and rainfall in Vientiane
Month
Mean temp (C)
Rain (mm/day)
Record high (C)
Record low (C)
Jan
21.3
0.25
38.2
5.7
Feb
24.6
0.47
39.9
7.2
Mar
28.1
1.14
42.4
11.4
Apr
30.5
2.05
44.3
13.3
May
29.3
5.43
44.4
19.5
Jun
27.9
5.68
40.1
21.7
Jul
27.2
6.55
41.3
21.8
Aug
26.7
7.92
35.1
21.6
Sep
26.6
6.80
34.7
18.3
Oct
25.3
2.74
36.0
13.1
Nov
23.2
0.52
37.0
9.4
Dec
20.7
0.19
35.3
5.6
What the Vientiane climate table shows
Values are multi-decadal climatological averages for the 17.9667, 102.6 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 7.92 mm/day in a month?
Rain is recorded as a daily mean, so 7.92 mm/day is roughly 241 mm across a 30-day month.