Climate averages 1991–2020
Moroni weather
in September.
A warm, fairly dry month: the 9th warmest and the driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Moroni: daytime highs average 27.9°C and nights cool to about 22.8°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 20 mm of rain on roughly 7 days, which makes September a fairly dry month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 02 min on an average September day.
The nearest other city in this atlas is Mamoudzou (246 km away). In September its highs average 26.1°C, 1.8°C cooler than Moroni, with 12 mm of rain.
From September to October, average highs rise by 1.0°C to 29.0°C, and monthly rainfall rises from 20 mm to 33 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Moroni climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.6°C26.1°C | 26.1°C | 240 | 22.8 | 12.713 h |
| February | 29.6°C26.1°C | 26.1°C | 213 | 21.7 | 12.512 h |
| March | 29.8°C26.1°C | 26.1°C | 199 | 25.8 | 12.212 h |
| April | 29.6°C26.0°C | 26.0°C | 124 | 22.6 | 11.812 h |
| May | 28.6°C25.3°C | 25.3°C | 63 | 17.1 | 11.612 h |
| June | 27.2°C24.0°C | 24.0°C | 44 | 15.2 | 11.411 h |
| July | 26.6°C23.1°C | 23.1°C | 40 | 15.2 | 11.512 h |
| August | 27.0°C22.4°C | 22.4°C | 27 | 10.3 | 11.712 h |
| September, selected | 27.9°C22.8°C | 22.8°C | 20 | 7.4 | 12.012 h |
| October | 29.0°C24.0°C | 24.0°C | 33 | 9.0 | 12.412 h |
| November | 29.7°C25.2°C | 25.2°C | 69 | 13.2 | 12.613 h |
| December | 30.0°C25.9°C | 25.9°C | 166 | 21.0 | 12.813 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
- Mamoudzou in SeptemberMayotte · 246 kmHigh 26.1°C · Low 23.6°C · 12 mm rain
- Pemba in SeptemberMozambique · 329 kmHigh 28.8°C · Low 21.2°C · 11 mm rain
- Mtwara in SeptemberTanzania · 371 kmHigh 27.9°C · Low 22.7°C · 9.6 mm rain
- Nacala in SeptemberMozambique · 423 kmHigh 27.6°C · Low 20.5°C · 7.0 mm rain
- Lindi in SeptemberTanzania · 430 kmHigh 29.7°C · Low 21.4°C · 12 mm rain
- Montepuez in SeptemberMozambique · 488 kmHigh 29.9°C · Low 18.1°C · 1.9 mm rain
- Masasi in SeptemberTanzania · 498 kmHigh 31.0°C · Low 19.0°C · 2.1 mm rain
- Mahajanga in SeptemberMadagascar · 556 kmHigh 32.6°C · Low 21.9°C · 2.8 mm rain
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 limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Moroni) is explained once on the Moroni year overview and on the Sources, method and limits page.