Climate averages 1991–2020

Sơn La weather
in July.

A hot, very wet month: the 4th warmest and the wettest of the year.

Long-term climate patterns, not a forecast for a particular trip.

Average high 28.1°C Daytime mean, July

Average low 22.1°C Night-time mean, July

Rainfall 288 mm 25 days with ≥1 mm

Daylight 13 h Sunrise to sunset, per day

July is a hot month in Sơn La: daytime highs average 28.1°C and nights cool to about 22.1°C. By daytime temperature it is the 4th warmest of the 12 months.

Expect about 288 mm of rain on roughly 25 days, which makes July a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 13 h 18 min on an average July day.

The nearest other city in this atlas is Thị Trấn Thuận Châu (27 km away). In July its highs average 28.6°C, about as warm as Sơn La, with 428 mm of rain.

Among the 136 cities listed in Vietnam, Sơn La ranks 127th of 136 for the warmest July highs and 106th of 136 for the driest July (rainfall, lowest first). The mean July high of those 136 cities is 30.8°C; Sơn La is 2.7°C cooler than that mean.

From July to August, average highs fall by 0.1°C to 28.0°C, and monthly rainfall falls from 288 mm to 283 mm.

The annual picture

July in context

30-year average

Average highAverage low°C

Monthly rainfall

Average total · mm

Averages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated

Every month, side by side

Sơn La climate table

1991–2020

Monthly climate averages for Sơn La, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	20.9°C12.3°C	12.3°C	24	4.0	11.011 h
February	23.5°C13.8°C	13.8°C	20	3.7	11.411 h
March	27.4°C16.9°C	16.9°C	50	7.1	12.012 h
April	29.0°C19.5°C	19.5°C	72	12.7	12.613 h
May	29.3°C21.3°C	21.3°C	147	19.3	13.113 h
June	28.7°C22.2°C	22.2°C	209	23.0	13.413 h
July, selected	28.1°C22.1°C	22.1°C	288	24.5	13.313 h
August	28.0°C21.8°C	21.8°C	283	25.2	12.913 h
September	27.4°C20.9°C	20.9°C	150	17.5	12.312 h
October	25.9°C18.8°C	18.8°C	49	8.3	11.712 h
November	23.8°C15.7°C	15.7°C	26	4.5	11.111 h
December	21.0°C12.4°C	12.4°C	23	3.6	10.911 h

Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.

Compare places

July in nearby cities

Distance from Sơn La

Read the numbers correctly

Climate, not a promise.

These patterns help compare months. They cannot tell you the weather on a specific day of your trip.

Sources, method and limits

How these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Sơn La) is explained once on the Sơn La year overview and on the Sources, method and limits page.