September
Other strong months: October and November
52/100 weather score
French Guiana · 1991–2020
Best time to visit
Cayenne
For Cayenne, September has the most comfortable weather in our climate comparison. Typical daytime highs are 32.5°C, nights average 22.4°C, and rainfall totals about 59 mm. Figures use measured 1991–2020 normals from the nearest eligible NOAA station.
Best all-round monthSeptember
Typical daytime high32.5°C
Typical night-time low22.4°C
September rainfall59 mm
October
Other strong months: September and November
78/100 weather score
October
Other strong months: September and November
32/100 weather score
Make the answer personal
Choose the weather
that suits you.
Set the daytime temperature and rainfall you are comfortable with. We will show only the months that meet every choice, using the measured 1991–2020 averages below.
2 months fit your choices for Cayenne
The lowest comfort score is 5 out of 100. January, April, May and June share that score. In January, that is mainly because 380 mm of rain falls.
Quick answers
Planning a trip to Cayenne?
These answers come from the same measured monthly climate record shown on this page.
When is the best time to visit Cayenne?
September is the strongest all-round choice in our temperature-and-rainfall comparison, with a typical daytime high of 32.5°C and 59 mm of rain.
What is the hottest month in Cayenne?
October is hottest in this record, with a typical daytime high of 32.7°C and a night-time low of 22.4°C.
Which month has the least rain?
October has the lowest monthly rainfall total at 56 mm.
Is this a weather forecast?
No. These are long-term measured averages from 1991–2020. Check a current forecast before you travel.
Month by month
See how the weather
changes through the year.
The bars combine daytime temperature, night-time temperature and rainfall. The figures are measured historical averages, not a forecast for a particular trip.
| Month | Day | Night | Rain | Wet days | Sea | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|---|
| January | 29.6°C | 23.3°C | 380 mm | 22.5 | 26.9°C | 11 h 52 | 5 | Strong coverage |
| February | 29.5°C | 23.5°C | 339 mm | 20.8 | 26.9°C | 11 h 57 | 8 | Strong coverage |
| March | 30°C | 23.7°C | 295 mm | 20.3 | 27.1°C | 12 h 05 | 13 | Strong coverage |
| April | 30.3°C | 23.7°C | 441 mm | 22.6 | 27.3°C | 12 h 13 | 5 | Strong coverage |
| May | 30.4°C | 23.6°C | 549 mm | 25.5 | 27.6°C | 12 h 20 | 5 | Strong coverage |
| June | 30.8°C | 23°C | 376 mm | 24.7 | 27.9°C | 12 h 24 | 5 | Strong coverage |
| July | 31.3°C | 22.5°C | 252 mm | 20.9 | 28.2°C | 12 h 23 | 16 | Strong coverage |
| August | 32°C | 22.5°C | 139 mm | 14.6 | 28.1°C | 12 h 17 | 35 | Strong coverage |
| September | 32.5°C | 22.4°C | 59 mm | 6.9 | 27.9°C | 12 h 08 | 52 | Strong coverage |
| October | 32.7°C | 22.4°C | 56 mm | 6.6 | 28.1°C | 12 h 00 | 52 | Strong coverage |
| November | 31.9°C | 22.6°C | 135 mm | 12.7 | 27.8°C | 11 h 53 | 38 | Strong coverage |
| December | 30.6°C | 23.2°C | 332 mm | 21.1 | 27.3°C | 11 h 50 | 6 | Strong coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 35.3°C7 Jan 2005 | 17.4°C23 Jan 1964 | 171 mm31 Jan 1968 | 908 mm1997 · driest 19 mm in 2002 | 75 |
| February | 32.3°C12 Feb 1998 | 18.9°C11 Feb 1976 | 182 mm27 Feb 1957 | 924 mm1953 · driest 9 mm in 2002 | 75 |
| March | 34.2°C25 Mar 2005 | 18.5°C9 Mar 1978 | 203 mm20 Mar 1970 | 885 mm1956 · driest 36 mm in 2019 | 75 |
| April | 33.0°C22 Apr 2010 | 19.0°C11 Apr 1965 | 190 mm14 Apr 2000 | 926 mm1990 · driest 24 mm in 2002 | 75 |
| May | 33.8°C16 May 2024 | 18.8°C30 May 1968 | 164 mm8 May 1955 | 1018 mm1984 · driest 33 mm in 2002 | 75 |
| June | 34.4°C30 Jun 2024 | 18.9°C26 Jun 1954 | 166 mm30 Jun 1975 | 802 mm1975 · driest 122 mm in 2002 | 75 |
| July | 33.9°C29 Jul 2020 | 19.2°C27 Jul 1956 | 135 mm9 Jul 1960 | 465 mm2008 · driest 62 mm in 2002 | 75 |
| August | 34.5°C19 Aug 2024 | 19.3°C5 Aug 1959 | 92 mm2 Aug 1988 | 333 mm1954 · driest 20 mm in 2003 | 75 |
| September | 35.2°C12 Sep 2017 | 18.7°C6 Sep 1967 | 94 mm17 Sep 2020 | 214 mm1975 · driest 4 mm in 1997 | 75 |
| October | 36.2°C7 Oct 2023 | 18.6°C11 Oct 1976 | 55 mm29 Oct 1953 | 300 mm1973 · driest 3 mm in 1976 | 75 |
| November | 34.6°C1 Nov 1951 | 17.2°C9 Nov 1958 | 109 mm22 Nov 1994 | 447 mm1968 · driest 13 mm in 1958 | 75 |
| December | 34.1°C4 Dec 2004 | 17.7°C29 Dec 2006 | 130 mm30 Dec 1983 | 665 mm2021 · driest 76 mm in 2004 | 75 |
| Month | Days 25°C+ | Days 30°C+ | Heavy rain (10 mm+) |
|---|---|---|---|
| January | 24 | 10 | 10 |
| February | 22 | 8 | 9 |
| March | 25 | 14 | 7 |
| April | 24 | 17 | 10 |
| May | 24 | 16 | 14 |
| June | 23 | 18 | 12 |
| July | 24 | 22 | 8 |
| August | 24 | 24 | 4 |
| September | 24 | 24 | 2 |
| October | 25 | 25 | 2 |
| November | 24 | 23 | 4 |
| December | 25 | 18 | 9 |
| Month | Dry days reaching 20°C | Wet days | Days with heavy rain | Weeks with 3+ wet days | Typical high by year |
|---|---|---|---|---|---|
| January | 22% | 77% | 37% | 95% | 28.3–30.1°C |
| February | 26% | 75% | 33% | 94% | 28.3–30.0°C |
| March | 29% | 70% | 29% | 90% | 28.6–30.6°C |
| April | 25% | 75% | 38% | 95% | 28.9–30.7°C |
| May | 14% | 86% | 52% | 99% | 28.8–30.8°C |
| June | 14% | 86% | 45% | 100% | 29.1–31.4°C |
| July | 30% | 70% | 30% | 93% | 29.8–31.8°C |
| August | 50% | 50% | 17% | 66% | 30.6–32.6°C |
| September | 74% | 26% | 6% | 29% | 31.1–33.1°C |
| October | 75% | 25% | 7% | 30% | 31.3–33.2°C |
| November | 55% | 45% | 16% | 65% | 30.4–32.4°C |
| December | 27% | 73% | 34% | 92% | 29.3–31.3°C |
A dry day reaching 20°C records under 1 mm of rain. A wet day records at least 1 mm, while a heavy-rain day records at least 10 mm. The weekly figure is the share of seven-day periods containing three or more wet days. The final column shows the middle 80% of average daytime highs recorded for that month in individual years; a wider range means conditions have varied more from one year to another.
The evidence behind this page
Where these figures
come from.
- Place identity
- GeoNames 3382160
- NOAA station
- FG000081405 · ROCHAMBEAU
- Station distance
- 12.2 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 25 usable years
- Daylight
- Calculated from latitude 4.94°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Sea temperature
- NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 21 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.
Next step
Choose your month.
Then plan the details.
The weather comparison for Cayenne is based on climate evidence, not payments from travel companies. Flight, accommodation and activity links will be clearly labelled when they are added; there are no booking offers on this page today.
How travel partnerships will work