Climate averages 1991–2020

Isiro weather
in September.

A warm, very wet month: the 8th warmest and the 10th driest of the year.

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

Average high 27.1°C Daytime mean, September

Average low 19.5°C Night-time mean, September

Rainfall 190 mm 26 days with ≥1 mm

Daylight 12 h Sunrise to sunset, per day

September is a warm month in Isiro: daytime highs average 27.1°C and nights cool to about 19.5°C. By daytime temperature it is the 8th warmest of the 12 months.

Expect about 190 mm of rain on roughly 26 days, which makes September a very wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 08 min on an average September day.

The nearest other city in this atlas is Bakwa (152 km away). In September its highs average 28.2°C, 1.2°C warmer than Isiro, with 175 mm of rain.

Among the 60 cities listed in the Democratic Republic of the Congo, Isiro ranks 54th of 60 for the warmest September highs and 57th of 60 for the driest September (rainfall, lowest first). The mean September high of those 60 cities is 29.6°C; Isiro is 2.6°C cooler than that mean.

From September to October, average highs fall by 0.3°C to 26.7°C, and monthly rainfall rises from 190 mm to 229 mm.

The annual picture

September 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

Isiro climate table

1991–2020

Monthly climate averages for Isiro, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	31.1°C19.9°C	19.9°C	37	6.6	12.012 h
February	31.6°C20.6°C	20.6°C	61	9.8	12.012 h
March	29.8°C20.7°C	20.7°C	146	20.2	12.112 h
April	28.1°C20.6°C	20.6°C	188	23.9	12.212 h
May	27.6°C20.4°C	20.4°C	152	24.4	12.212 h
June	27.0°C19.8°C	19.8°C	134	23.9	12.312 h
July	26.6°C19.4°C	19.4°C	149	25.2	12.312 h
August	26.7°C19.3°C	19.3°C	178	26.2	12.212 h
September, selected	27.1°C19.5°C	19.5°C	190	26.4	12.112 h
October	26.7°C19.6°C	19.6°C	229	28.3	12.112 h
November	27.2°C19.6°C	19.6°C	201	24.0	12.012 h
December	29.1°C19.6°C	19.6°C	58	10.1	12.012 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

September in nearby cities

Distance from Isiro

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