Climate averages 1991–2020

Columbus weather
in August.

A warm, moderately wet month: the 2nd warmest and the joint 2nd driest of the year.

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

Average high 27.8°C Daytime mean, August

Average low 18.3°C Night-time mean, August

Rainfall 73 mm 10 days with ≥1 mm

Daylight 14 h Sunrise to sunset, per day

August is a warm month in Columbus: daytime highs average 27.8°C and nights cool to about 18.3°C. By daytime temperature it is the 2nd warmest of the 12 months.

Expect about 73 mm of rain on roughly 10 days, which makes August a moderately wet month (the joint 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 45 min on an average August day.

The nearest other city in this atlas is Dayton (104 km away). In August its highs average 27.9°C, about as warm as Columbus, with 81 mm of rain.

Among the 498 cities listed in the United States, Columbus ranks joint 337th of 498 for the warmest August highs and joint 234th of 498 for the driest August (rainfall, lowest first). The mean August high of those 498 cities is 29.9°C; Columbus is 2.1°C cooler than that mean.

From August to September, average highs fall by 3.5°C to 24.3°C, and monthly rainfall stays at 73 mm.

The annual picture

August 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

Columbus climate table

1991–2020

Monthly climate averages for Columbus, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	2.2°C-6.1°C	-6.1°C	84	10.7	9.710 h
February	4.4°C-4.7°C	-4.7°C	71	9.4	10.711 h
March	9.7°C-0.2°C	-0.2°C	98	11.2	11.912 h
April	16.6°C5.6°C	5.6°C	115	12.4	13.213 h
May	21.8°C11.6°C	11.6°C	113	13.3	14.414 h
June	26.3°C16.8°C	16.8°C	103	11.9	15.015 h
July	28.3°C19.0°C	19.0°C	88	11.1	14.715 h
August, selected	27.8°C18.3°C	18.3°C	73	9.6	13.714 h
September	24.3°C14.6°C	14.6°C	73	8.3	12.512 h
October	17.5°C8.3°C	8.3°C	74	9.0	11.211 h
November	10.3°C2.1°C	2.1°C	80	9.4	10.010 h
December	4.5°C-2.7°C	-2.7°C	86	10.3	9.49 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

August in nearby cities

Distance from Columbus

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 Columbus) is explained once on the Columbus year overview and on the Sources, method and limits page.