San Francisco weather in June
In June, San Francisco has daytime highs averaging 21 °C, nights around 12 °C, with 0.8 wet days, and a sea temperature of 12 °C. Figures are 1991–2020 climate normals.
- 21.0°C Average high
- 11.9°C Average low
- 0.8days Wet days
- 3mm Rainfall
- 12.1°C Sea temperature
- 15h Daylight
Daily temperatures through June
How June develops
Averages for the first, middle and last part of the month, from daily 1991–2020 normals. Chance of rain is the share of years in which that calendar day recorded more than 1 mm.
| Days | Avg high | Avg low | Chance of rain |
|---|---|---|---|
| 1–10 June | 20.2 °C | 11.6 °C | 4 % |
| 11–20 June | 21.5 °C | 11.9 °C | 2 % |
| 21–30 June | 21.5 °C | 12.3 °C | 2 % |
- Average highs rise from 20.2 °C early in June to 21.5 °C by the end of it.
What to expect
| Measure | Typical June | Share of the month |
|---|---|---|
| Days above 25 °C | 3.8 of 30 | 13 % |
| Days above 30 °C | 0.6 of 30 | 2 % |
| Days below 0 °C | 0 of 30 | 0 % |
| Days with more than 1 mm rain | 0.8 of 30 | 3 % |
Conditions in June
| Measure | Average |
|---|---|
| Mean temperature | 16 °C |
| Record high (1991–2020) | 35 °C |
| Record low (1991–2020) | 7.9 °C |
| Relative humidity | 73 % |
| Wind speed | 21 km/h |
| Cloud cover | 35 % |
Where San Francisco ranks in June
| Ranking | Position | Value |
|---|---|---|
| Places with the best weather in North America in June | 16th of 50 | 92/100 |
| The coolest places in North America in June | 19th of 50 | 21 °C |
| The driest places in North America in June | 29th of 50 | 3.5 mm |
June compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| April | 17.3 °C | 37 mm | 48 % |
| May | 18.9 °C | 18 mm | 45 % |
| June | 21.0 °C | 3 mm | 35 % |
| July | 21.4 °C | under 1 mm | 38 % |
| August | 21.9 °C | 1 mm | 39 % |
See all twelve months for San Francisco
- June is the 5th warmest month here.
- It is the 4th driest month of the year.
- It ranks 2nd for least cloud cover.
- Days last about 15 hours from sunrise to sunset.
- It rains on 0.8 of 30 days — 3 % of the month.
- Nights are about 9.1 °C cooler than the middle of the day.
- The hottest June day on record since 1991 reached 35 °C, 14 °C above the usual daytime high.
- Beach score: 49 / 100 — see how this is calculated.
QuestionsJune in San Francisco, answered
How warm is San Francisco in June?
Daily highs average 21 °C and nights fall to about 12 °C, a spread of 9.1 °C between afternoon and dawn. That makes June the 4th warmest month of the year here.
Does it rain much in San Francisco in June?
June averages 3 mm of rain, spread over about 1 of the 30 days — 3 % of the month. Cloud cover averages 35 % of the sky.
Is the sea warm enough to swim in June?
The sea averages 12 °C off San Francisco in June. Most people find water below 20 °C bracing and above 25 °C comfortable for a long swim; this figure is a monthly surface average, so a sheltered bay on a still afternoon can be warmer.
How long are the days in June?
San Francisco averages 15 hours between sunrise and sunset in June. Day length is computed from latitude and date, so it is exact rather than modelled — but it says nothing about how much of that time is sunny.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: daylight hours, beach and comfort scores, monthly rankings, threshold day counts, chance of a wet day by date, ten-day averages within the month. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.