Reykjavík Weather in September
Average highs run from 13°C on September 1 to 10°C on September 30, and lows from 8°C to 4°C. Normal precipitation for the month is 100 mm over about 21 wet days.
September day by day
The normal high and low for each date, and the record, in °C.
- Normal low
- Normal high
- Record high
- Record low
September at a glance
- Average high
- 11°C
- Average low
- 6°C
- Precipitation
- 100 mm
- Record high
- 19°CSep 10, 1968
- Record low
- -4°CSep 24, 1974
- Daylight
- 14 h 33 min to 11 h 27 min
- Cloud cover
- 76%
- Humidity
- 88%
- Dew point
- 6°C
- Wind
- 16.6 km/h
Every day of the month
A wet day has at least 1 mm of precipitation in the reanalysis.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Sep 1 | 13°C | 8°C | 18°C 2025 | 2°C 1985 | 71% |
| Sep 2 | 13°C | 8°C | 18°C 2006 | 2°C 1983 | 71% |
| Sep 3 | 13°C | 8°C | 17°C 2010 | 0°C 1992 | 71% |
| Sep 4 | 13°C | 8°C | 17°C 2010 | -2°C 1982 | 72% |
| Sep 5 | 13°C | 7°C | 17°C 2016 | 1°C 1992 | 72% |
| Sep 6 | 12°C | 7°C | 16°C 2010 | 1°C 1965 | 71% |
| Sep 7 | 12°C | 8°C | 17°C 1954 | 1°C 1985 | 70% |
| Sep 8 | 12°C | 8°C | 17°C 2025 | 0°C 1972 | 69% |
| Sep 9 | 12°C | 7°C | 17°C 1961 | 0°C 1977 | 68% |
| Sep 10 | 12°C | 7°C | 19°C 1968 | 0°C 1965 | 68% |
| Sep 11 | 12°C | 7°C | 19°C 1968 | -1°C 1962 | 67% |
| Sep 12 | 12°C | 6°C | 18°C 2002 | -1°C 1956 | 66% |
| Sep 13 | 12°C | 6°C | 17°C 2002 | -2°C 1997 | 67% |
| Sep 14 | 12°C | 6°C | 16°C 2006 | -1°C 1979 | 67% |
| Sep 15 | 11°C | 6°C | 15°C 2021 | -1°C 1957 | 67% |
| Sep 16 | 11°C | 6°C | 15°C 1961 | 0°C 1954 | 68% |
| Sep 17 | 11°C | 6°C | 16°C 1999 | -2°C 1952 | 67% |
| Sep 18 | 11°C | 6°C | 14°C 1996 | -2°C 1997 | 68% |
| Sep 19 | 11°C | 6°C | 15°C 1999 | -1°C 2000 | 68% |
| Sep 20 | 11°C | 6°C | 17°C 1999 | -3°C 1964 | 68% |
| Sep 21 | 11°C | 6°C | 16°C 1999 | -2°C 1979 | 68% |
| Sep 22 | 10°C | 5°C | 15°C 2019 | -2°C 1982 | 69% |
| Sep 23 | 11°C | 5°C | 15°C 2019 | -3°C 1971 | 69% |
| Sep 24 | 11°C | 6°C | 16°C 2000 | -4°C 1974 | 70% |
| Sep 25 | 11°C | 5°C | 17°C 2000 | -3°C 2005 | 72% |
| Sep 26 | 10°C | 6°C | 19°C 2019 | -2°C 1969 | 70% |
| Sep 27 | 10°C | 5°C | 16°C 2019 | -2°C 1952 | 70% |
| Sep 28 | 10°C | 5°C | 16°C 1958 | -2°C 1954 | 68% |
| Sep 29 | 10°C | 5°C | 17°C 1992 | -3°C 1975 | 68% |
| Sep 30 | 10°C | 4°C | 17°C 1958 | -3°C 1969 | 68% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT).
- September 1
- sunrise 6:10 AM, sunset 8:43 PM
- September 30
- sunrise 7:33 AM, sunset 7:00 PM
Other months
Sources
Records: NOAA GHCN-Daily, station IC000004030, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.