What is the weather like in Reykjavík vs San Juan in September?

In September, Reykjavík averages 11°C high / 6°C low with about 133 mm of rain; San Juan averages 32°C high / 26°C low with about 147 mm.

Reykjavík vs San Juan in September

Reykjavík is the better pick in September — 68 vs 61 on SeasonMap's comfort score. Reykjavík is cold, rainy, clean air, while San Juan is sweltering, rainy, clean air.

Reykjavík vs San Juan — September climate, side by side

	🇮🇸 Reykjavík	🇵🇷 San Juan
Comfort score	68/100 (C)	61/100 (C)
Feels-like high	8°C	38°C
Avg high / low	11° / 6°	32° / 26°
Rainfall	133 mm	147 mm
Rainy days	18	13
Humidity	85%	83%
Air quality (AQI)	32	29

Monthly climate normals (ERA5 reanalysis). Comfort scores are SeasonMap estimates.

Month by month

Reykjavík vs San Juan in September — FAQ

Is September better in Reykjavík or San Juan?: Reykjavík is the better pick in September — 68 vs 61 on SeasonMap's comfort score. Reykjavík is cold, rainy, clean air, while San Juan is sweltering, rainy, clean air.
What is the weather like in Reykjavík vs San Juan in September?: In September, Reykjavík averages 11°C high / 6°C low with about 133 mm of rain; San Juan averages 32°C high / 26°C low with about 147 mm.