Johnston climate

Typical historical weather for Johnston, United States, averaged across 10 years of hourly climate data. Pick a date for a specific day.

Want today's actual conditions instead? See the current forecast for Johnston.

Annual average

18.6°C

across all months

Warmest month

33.2°C

Jul average high

Coolest month

3.3°C

Jan average low

Annual rainfall

1197mm

total per year

Monthly averages

Average daily high/low temperature (band) and monthly rainfall (bars).

● Avg high● Avg low▮ Rainfall

Records on file

Hottest day

39.2°C

22 June 2022

Coldest day

-11.5°C

24 December 2022

Wettest day

126.2mm

7 November 2024

Windiest day

9.9m/s

11 September 2017