See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
Compare today's weather with yesterday's data and track temperature trends over time.
Hourly Forecast
Daylight Hours
06:56
Sunrise
19:12
Sunset
Moon
Waxing Crescent
10:40
Moonrise
20:27
Moonset
Daily Forecast
Monday
Today
Wednesday
Thursday
Friday
Saturday
Sunday
Monday
Tuesday
Wednesday
Air Quality Data Available
Upgrade to access real-time air quality data for Hillsborough.
Resources
UV Index
Humidity
Weather in Hillsborough tomorrow, September 15, 2026
Hillsborough is set for a fine, sunny day on September 15, 2026, with only limited interruptions to the clear sky. The early hours look particularly favourable for being outside. The first half of the day looks overcast, as cloud amounts reach about 100% around 00:00. Brighter weather, if it comes, waits until later.
Expect highs of 21°C and cooler readings close to 13°C. Expect humidity between 60% and 89%, most humid near 22:00. Expect gentle winds, highest near 15:00 at 6.9 km/h.
Later hours favour clearer intervals, as cloud stays near 21% around 21:00. The afternoon is the better half for outdoor time. Visibility stays generally good near 13.9 km on average, though it can drop toward 8.0 km in thicker cloud or showers. The sun rises at 06:57 and sets at 19:10, for a total of 12 hours 13 minutes of sunlight today.
The practical takeaway for Hillsborough is a bright September 15, 2026, ideal for outdoor errands before temperatures ease from about 21°C.
Frequently asked questions about weather in Hillsborough
How warm does it get in Hillsborough?
The warmest month in Hillsborough is September, with average high temperatures of 19°C. The average temperature during this period is around 16°C.
How cold does it get in Hillsborough?
The coldest month in Hillsborough is February, with average low temperatures of 9°C. The average temperature during this period is around 11°C.
What is the wettest time of year in Hillsborough?
The wettest month in Hillsborough is January, with an average of 113mm of precipitation.
What is the driest time of year in Hillsborough?
The driest month in Hillsborough is July, with an average of 1mm of precipitation.
Explore more weather forecasts
- Burlingame, California
- New York City, New York
- Millbrae, California
- Los Angeles, California
- San Mateo, California
- Brooklyn, New York
- San Bruno, California
- Chicago, Illinois
- South San Francisco, California
- Houston, Texas
- Foster City, California
- Queens, New York
- Pacifica, California
- Phoenix, Arizona
- Belmont, California
- Philadelphia, Pennsylvania