Climate averages 1991–2020
Redwood City weather
in May.
A mild, fairly dry month: the 6th warmest and the 5th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Redwood City: daytime highs average 19.8°C and nights cool to about 10.9°C. By daytime temperature it is the 6th warmest of the 12 months.
Expect about 20 mm of rain on roughly 3 days, which makes May a fairly dry month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 10 min on an average May day.
The nearest other city in this atlas is San Mateo (12 km away). In May its highs average 19.3°C, about as warm as Redwood City, with 20 mm of rain.
Among the 498 cities listed in the United States, Redwood City ranks joint 394th of 498 for the warmest May highs and joint 112th of 498 for the driest May (rainfall, lowest first). The mean May high of those 498 cities is 23.8°C; Redwood City is 4.0°C cooler than that mean.
From May to June, average highs rise by 2.7°C to 22.5°C, and monthly rainfall falls from 20 mm to 3.9 mm.
The annual picture
May in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Redwood City climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 14.1°C6.9°C | 6.9°C | 99 | 9.4 | 9.910 h |
| February | 14.9°C7.6°C | 7.6°C | 107 | 9.5 | 10.811 h |
| March | 16.2°C8.6°C | 8.6°C | 82 | 9.1 | 11.912 h |
| April | 17.6°C9.4°C | 9.4°C | 41 | 5.6 | 13.113 h |
| May, selected | 19.8°C10.9°C | 10.9°C | 20 | 3.3 | 14.214 h |
| June | 22.5°C12.4°C | 12.4°C | 3.9 | 0.9 | 14.715 h |
| July | 24.2°C13.9°C | 13.9°C | 0.5 | 0.2 | 14.514 h |
| August | 24.5°C14.4°C | 14.4°C | 0.7 | 0.1 | 13.614 h |
| September | 24.6°C14.5°C | 14.5°C | 1.8 | 0.4 | 12.512 h |
| October | 22.1°C13.1°C | 13.1°C | 23 | 3.0 | 11.311 h |
| November | 17.2°C10.1°C | 10.1°C | 51 | 6.0 | 10.210 h |
| December | 13.8°C7.5°C | 7.5°C | 94 | 9.3 | 9.610 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- San Mateo in MayUnited States · 12 kmHigh 19.3°C · Low 10.9°C · 20 mm rain
- Mountain View in MayUnited States · 17 kmHigh 20.8°C · Low 10.9°C · 19 mm rain
- Sunnyvale in MayUnited States · 22 kmHigh 21.3°C · Low 10.8°C · 22 mm rain
- Union City in MayUnited States · 23 kmHigh 22.1°C · Low 11.1°C · 19 mm rain
- Fremont in MayUnited States · 23 kmHigh 21.7°C · Low 11.0°C · 19 mm rain
- Hayward in MayUnited States · 25 kmHigh 21.7°C · Low 10.8°C · 17 mm rain
- Milpitas in MayUnited States · 30 kmHigh 22.3°C · Low 11.3°C · 19 mm rain
- Daly City in MayUnited States · 32 kmHigh 16.5°C · Low 10.0°C · 18 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Redwood City) is explained once on the Redwood City year overview and on the Sources, method and limits page.
San Mateo lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.