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Climate · Selfoss

Selfoss in September

Cool and wet, as the days shorten.

Typical weather, averaged over 30 years

September in Selfoss is cool: highs near 53°F, lows near 43°F. Rain falls on about five days a week, and the days shorten by 2 hours 19 minutes from the first week to the last.September in Selfoss is cool: highs near 12°C, lows near 6°C. Rain falls on about five days a week, and the days shorten by 2 hours 19 minutes from the first week to the last.

High
53°F12°Caverage
Low
43°F6°Caverage
Wet days
5a week · 66% of days
Daylight
12h 48mon average

Is September a good time to visit Selfoss?

September sits outside Selfoss's mildest months, which run from June to August. Expect cool days and rain on about five days a week.

How we judge it: every month is scored on how close its typical high comes to the range from 70°F to 80°F, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.How we judge it: every month is scored on how close its typical high comes to the range from 21°C to 27°C, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.

How September sits in the year

week by week

Temperature

Highs near 53°F in September, against 37°F to 59°F through the year.Highs near 12°C in September, against 3°C to 15°C through the year.

Chance of a wet day

66% of days in September, against 50% to 66% through the year.

Cloud cover

69% cover in September, against 61% to 75% through the year.

Daylight

12h 48m in September, against 4h 26m to 20h 41m through the year.

Week by week, lightly smoothed, with September shaded. The olive line marks the mildest months. Hover or tap a week for its figures.

Either side

  1. August59°15°low 47°low 8°4 wet days a weekRain on about four days a week.
  2. September53°12°low 43°low 6°5 wet days a weekRain on about five days a week.
  3. October47°8°low 37°low 3°4 wet days a weekRain on about four days a week.

Where Selfoss sits, in September

Atlantic/Reykjavik
this place
typical high in September 40°F4°C95°F35°C
Sunrise, mid-September
6:44 AMsets 7:54 PM
Above the sea
95 mlow-lying
Latitude
63.9°Nnorthern hemisphere
Nearest of ours
Hella32 km east

The land around Selfoss, shaded by its typical high in September, the planning map's own layer. Hover the map for the figure at that spot; tap it on a phone. Clock times are local, for the 15th.

Elsewhere in Iceland in September

high · low · wet days
See September on the planning mapThe whole year in Selfoss

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest Selfoss. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match, and both highs and lows are adjusted for the town's height (95 m) against the climate model's (15 m).Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match, and both highs and lows are adjusted for the town's height (95 m) against the climate model's (15 m). Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not. Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.

Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not.

Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.