nomadseason

May Weather in San Francisco, Argentina

Last updated: August 22, 2025

In San Francisco, Argentina, the average temperature in May is a comfortable 15°C (59°F). However, be prepared for temperature fluctuations, as it can dip to a chilly 0°C (33°F) or peak at a warm 30°C (86°F). During this time, expect about 61 mm (2.4 in) of precipitation over approximately 7 days, contributing to an average humidity of 83%.

May Temperature in San Francisco

In May in San Francisco, the average temperature is 15°C (59°F), with a maximum that can reach 30°C (86°F) and a minimum that can drop as low as 0°C (33°F). This variation in temperature makes it essential for travelers to pack layers to comfortably adapt to the changing conditions.

May Weather in San Francisco: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in San Francisco, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Francisco, May typically has an average temperature of 15°C (59°F), with highs reaching up to 30°C (86°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec777571675954535762677376
Data source: Temperature data for San Francisco generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in San Francisco

In San Francisco in May, the precipitation amount is 61 mm (2.4 in) over the course of 7 days.

May Precipitation Trends in San Francisco

The chart displays monthly precipitation patterns in San Francisco, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In San Francisco, May typically receives around 61 mm (2.4 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec10570901206119191437898495
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

May Humidity in San Francisco

In San Francisco in May humidity is 83%. With an average temperature of 15°C (59°F), this humidity feels like a cozy, damp embrace that can be quite stifling for traveling, making even short walks feel more exhausting than they should, and prompting a need for frequent breaks in shaded or air-conditioned areas.

May Average Humidity in San Francisco

This chart illustrates the average monthly humidity levels in San Francisco, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in San Francisco is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec51%57%65%76%83%78%58%54%59%50%53%57%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in San Francisco

In San Francisco in May, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in San Francisco, you can refer to this Hourly UV Index in San Francisco.

Maximum UV Index Levels in San Francisco for May

The chart shows the monthly maximum UV Index (UVI) for San Francisco in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in San Francisco typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141312864569111414
Data source: San Francisco May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How May Weather in San Francisco Compares to Other Months

Weather in San Francisco varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in San Francisco, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in San Francisco, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather25°C (78°F)105 mm (4.1 inches)51%extreme
February Weather24°C (75°F)70 mm (2.8 inches)57%extreme
March Weather22°C (72°F)90 mm (3.5 inches)65%extreme
April Weather19°C (67°F)120 mm (4.7 inches)76%very high
May Weather15°C (59°F)61 mm (2.4 inches)83%high
June Weather12°C (54°F)19 mm (0.7 inches)78%moderate
July Weather11°C (53°F)19 mm (0.8 inches)58%moderate
August Weather14°C (57°F)14 mm (0.5 inches)54%high
September Weather17°C (63°F)37 mm (1.5 inches)59%very high
October Weather19°C (67°F)89 mm (3.5 inches)50%extreme
November Weather23°C (73°F)84 mm (3.3 inches)53%extreme
December Weather24°C (76°F)95 mm (3.7 inches)57%extreme

Compare San Francisco's Climate with Cities Worldwide