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May Weather in San Francisco, Guatemala

Last updated: August 23, 2025

In San Francisco, Guatemala, the average temperature in May reaches a scorching 31°C (87°F), with highs soaring to 44°C (112°F) and lows dipping to 21°C (69°F). Expect 104 mm (4.1 in) of precipitation over 13 days, accompanied by an average humidity of 53%. Stay hydrated and prepared for the heat!

May Temperature in San Francisco

In May in San Francisco, the average temperature is 31°C (87°F). Maximums can reach 44°C (112°F) and minimums can be as low as 21°C (69°F). Make sure to stay hydrated and wear appropriate clothing to enjoy your travels comfortably!

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 31°C (87°F), with highs reaching up to 44°C (112°F) and lows dropping to around 21°C (69°F).
JanFebMarAprMayJunJulAugSepOctNovDec747881868783838382807775
Data source: Temperature data for San Francisco generated using information from the Copernicus Climate Change Service.
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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 104 mm (4.1 in) over the course of 13 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 104 mm (4.1 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec4323314010424713615821520011055
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in San Francisco

In San Francisco in May, humidity is 53%. With an average temperature of 31°C (87°F), this humidity feels like a warm embrace that can leave you feeling sticky and slightly fatigued while traveling, making it essential to stay hydrated and take regular breaks in the shade.

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 53%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%73%59%53%54%55%61%71%77%78%82%86%
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 reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the 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 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec9111314131313131312108
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 Weather24°C (75°F)43 mm (1.7 inches)84%very high
February Weather25°C (78°F)23 mm (0.9 inches)73%extreme
March Weather27°C (81°F)31 mm (1.2 inches)59%extreme
April Weather30°C (87°F)40 mm (1.6 inches)52%extreme
May Weather31°C (87°F)104 mm (4.1 inches)53%extreme
June Weather28°C (83°F)247 mm (9.7 inches)55%extreme
July Weather28°C (83°F)136 mm (5.4 inches)61%extreme
August Weather28°C (83°F)158 mm (6.2 inches)71%extreme
September Weather28°C (82°F)215 mm (8.4 inches)77%extreme
October Weather27°C (80°F)200 mm (7.9 inches)78%extreme
November Weather25°C (77°F)110 mm (4.3 inches)82%very high
December Weather24°C (75°F)55 mm (2.2 inches)86%very high

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