San Bernardino Weather in May
Thinking of visiting San Bernardino in May? Expect high temperatures reaching 26°C (79°F) during the day, dropping to 15°C (59°F) at night, and note that quite a bit of rainfall is likely.
Rainfall in San Bernardino in May
Historically, approximately 6 days this month are expected to have rain, averaging 143 mm (5.6 in). Showers tend to be short but heavy rather than persistent drizzle. When it rains, it usually means it, but it doesn't last long.
Temperature in San Bernardino in May
Expect highs of 26°C (79°F) in San Bernardino in May, with nights dropping to around 15°C (59°F). This month falls in the winter season. Conditions stay fairly consistent through the month, making it easier to plan what to wear. Nights cool down to 15°C (59°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.
Sunshine in San Bernardino in May
With approximately 206 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.If your ideal day consists of dry skies and pleasant temperatures, July and August typically offer the best circumstances for San Bernardino.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Paraguay, check out our San Bernardino's climate page.
San Bernardino Temperature in May
Min Temperature
15°C (59°F)
Max Temperature
26°C (79°F)
Chance of Rain
19%
Precipitation
143 mm (5.6 in)
Rainy days
6 days
Humidity
76% *
Sunshine
206 hours *
Percentage Sunshine
*
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in San Bernardino typically drop from around 26°C (79°F) at the start of May to approximately 23°C (73°F) by the end. Nights are pleasant, with lows typically ranging from 13°C (55°F) to 17°C (63°F).
Average temperatures in May
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Historical weather for San Bernardino in May
Browse day-by-day weather records for San Bernardino spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
San Bernardino historical weather extremes in May
Based on weather observations in San Bernardino between 1976 and 2026, these are the recorded extremes during May.
- The warmest day in May was on May 1, 2024, with a maximum of 35°C (95°F).
- The coldest May day was on May 31, 1983, with a maximum of 11°C (52°F).
- Nighttime temperatures dropped to 3°C (37°F) on May 30, 2008, marking the coldest May night on record.
Best Places in Paraguay in May
Find out more about the weather in Paraguay and which places have the best travel conditions in this month. See all of Paraguay in May →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in San Bernardino in May
Warm weather calls for comfortable, breathable clothing in May. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in San Bernardino in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Paraguay, check out our San Bernardino's climate page.
Temperature Rainfall Sunshine Humidity
See the full San Bernardino climate overview or explore weather in Paraguay.
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