Millbrae weather in September
In September, Millbrae sees average daytime highs of 65°F and overnight lows near 57°F, with 0.1 in of rain across 0.5 wet days and about 12.3 hours of daylight. It is the 1st-warmest and 10th-wettest month of the year here.
Day-to-day highs hold fairly steady near 65°F through the month. The sky is clear or mostly clear about 56% of the time in September, and the air most often feels dry.
Daylight stretches from about 12 h 48 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Millbrae's 1st-clearest and 12th-windiest month. For the whole year in context, see Millbrae's year-round climate.
- Daytime high
- 65°
- 1st warmest
- Overnight low
- 57°
- 12th coldest
- Rainfall
- 0.1 in
- 0.5 wet days
- Daylight
- 12 h 12 min
- 5:57 AM – 6:11 PM
- Cloud cover
- 37%
- 1st clearest
- Wind
- 7 mph
- 12th windiest
- Solar energy
- 5.64 kWh/m²
- Travel score
- 7.7
- out of 10
Millbrae is city located in northern San Mateo County, California, United States.
- Density
- 2,701/km²
- people per km²
- Founded
- 1948
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in September
Day-to-day highs hold fairly steady near 65°F through the month.
A typical September day in Millbrae reaches about 65°F in the afternoon and slips back to 57°F overnight — a 8°F spread between the day's warmth and the night's chill. On most days the high lands between 61°F and 70°F. Set against its neighbours, September runs on par with August and about 1°F warmer than October.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 |
| Avg low (°F) | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 56 | 56 | 56 | 56 | 56 | 56 | 56 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 65 | 57 |
| 2 | 65 | 57 |
| 3 | 65 | 57 |
| 4 | 65 | 57 |
| 5 | 65 | 57 |
| 6 | 65 | 57 |
| 7 | 65 | 57 |
| 8 | 65 | 57 |
| 9 | 65 | 57 |
| 10 | 65 | 57 |
| 11 | 65 | 57 |
| 12 | 65 | 57 |
| 13 | 65 | 57 |
| 14 | 65 | 57 |
| 15 | 65 | 57 |
| 16 | 65 | 57 |
| 17 | 65 | 57 |
| 18 | 65 | 57 |
| 19 | 65 | 57 |
| 20 | 65 | 57 |
| 21 | 65 | 57 |
| 22 | 65 | 57 |
| 23 | 65 | 57 |
| 24 | 65 | 56 |
| 25 | 65 | 56 |
| 26 | 65 | 56 |
| 27 | 65 | 56 |
| 28 | 65 | 56 |
| 29 | 65 | 56 |
| 30 | 65 | 56 |
Millbrae weather by month
How September compares with the rest of the year at a glance. September is the 1st-warmest and 10th-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 55° / 48° | 4.0 | 10 | 9.7 | 3.6 |
| Feb | 56° / 49° | 4.2 | 9.4 | 10.6 | 3.8 |
| Mar | 57° / 50° | 3.1 | 9.3 | 11.7 | 4.2 |
| Apr | 58° / 51° | 1.5 | 5.3 | 12.9 | 4.8 |
| May | 59° / 52° | 0.7 | 3.1 | 14 | 5.5 |
| Jun | 61° / 54° | 0.2 | 0.8 | 14.5 | 6.5 |
| Jul | 63° / 55° | 0.0 | 0.1 | 14.3 | 7.1 |
| Aug | 64° / 57° | 0.0 | 0.1 | 13.4 | 7.5 |
| Sep | 65° / 57° | 0.1 | 0.5 | 12.3 | 7.7 |
| Oct | 64° / 55° | 0.9 | 3.1 | 11 | 7.1 |
| Nov | 59° / 52° | 2.1 | 6.2 | 10 | 5.1 |
| Dec | 56° / 49° | 4.0 | 9.8 | 9.5 | 3.7 |
Cloud cover in September
The sky is clear or mostly clear about 56% of the time in September, the clearest month of the year.
Beyond those clear spells, partly cloudy skies cover about 23% of September, with mostly cloudy or overcast conditions the remaining 21%. Skies tend to open up as the month goes on.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 80 | 81 | 81 | 81 | 81 | 81 | 81 | 81 | 80 | 79 | 79 | 79 | 79 | 79 | 79 | 79 | 79 | 79 | 80 | 79 | 79 | 80 | 79 | 79 | 78 | 78 | 79 | 78 | 78 | 77 |
| Cloudier (%) | 20 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 20 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 20 | 21 | 21 | 20 | 21 | 21 | 22 | 22 | 21 | 22 | 22 | 23 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 80 | 20 |
| 2 | 81 | 19 |
| 3 | 81 | 19 |
| 4 | 81 | 19 |
| 5 | 81 | 19 |
| 6 | 81 | 19 |
| 7 | 81 | 19 |
| 8 | 81 | 19 |
| 9 | 80 | 20 |
| 10 | 79 | 21 |
| 11 | 79 | 21 |
| 12 | 79 | 21 |
| 13 | 79 | 21 |
| 14 | 79 | 21 |
| 15 | 79 | 21 |
| 16 | 79 | 21 |
| 17 | 79 | 21 |
| 18 | 79 | 21 |
| 19 | 80 | 20 |
| 20 | 79 | 21 |
| 21 | 79 | 21 |
| 22 | 80 | 20 |
| 23 | 79 | 21 |
| 24 | 79 | 21 |
| 25 | 78 | 22 |
| 26 | 78 | 22 |
| 27 | 79 | 21 |
| 28 | 78 | 22 |
| 29 | 78 | 22 |
| 30 | 77 | 23 |
Chance of precipitation in September
Millbrae gets around 0.1 in of rain over 0.5 wet days in September. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 2% and peaks near 5% on the wettest days.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 5 |
| Rain chance (%) | |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 1 |
| 9 | 1 |
| 10 | 1 |
| 11 | 1 |
| 12 | 1 |
| 13 | 1 |
| 14 | 2 |
| 15 | 2 |
| 16 | 2 |
| 17 | 2 |
| 18 | 2 |
| 19 | 2 |
| 20 | 2 |
| 21 | 2 |
| 22 | 2 |
| 23 | 3 |
| 24 | 3 |
| 25 | 3 |
| 26 | 3 |
| 27 | 4 |
| 28 | 4 |
| 29 | 4 |
| 30 | 5 |
Humidity in September
Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the dry band about 53% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 47 | 48 | 48 | 49 | 49 | 50 | 50 | 50 | 51 | 51 | 51 | 51 | 51 | 51 | 51 | 51 | 52 | 53 | 53 | 53 | 53 | 53 | 54 | 54 | 55 | 56 | 57 | 59 | 60 | 61 |
| Comfortable (%) | 50 | 49 | 49 | 48 | 48 | 48 | 47 | 47 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 45 | 45 | 45 | 45 | 45 | 44 | 44 | 43 | 42 | 41 | 40 | 39 | 38 |
| Humid (%) | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 |
| Dry (%) | Comfortable (%) | Humid (%) | |
|---|---|---|---|
| 1 | 47 | 50 | 3 |
| 2 | 48 | 49 | 3 |
| 3 | 48 | 49 | 3 |
| 4 | 49 | 48 | 3 |
| 5 | 49 | 48 | 3 |
| 6 | 50 | 48 | 3 |
| 7 | 50 | 47 | 3 |
| 8 | 50 | 47 | 3 |
| 9 | 51 | 46 | 3 |
| 10 | 51 | 46 | 3 |
| 11 | 51 | 46 | 3 |
| 12 | 51 | 46 | 3 |
| 13 | 51 | 46 | 3 |
| 14 | 51 | 46 | 3 |
| 15 | 51 | 46 | 3 |
| 16 | 51 | 46 | 3 |
| 17 | 52 | 46 | 2 |
| 18 | 53 | 45 | 2 |
| 19 | 53 | 45 | 2 |
| 20 | 53 | 45 | 2 |
| 21 | 53 | 45 | 2 |
| 22 | 53 | 45 | 2 |
| 23 | 54 | 44 | 2 |
| 24 | 54 | 44 | 2 |
| 25 | 55 | 43 | 2 |
| 26 | 56 | 42 | 2 |
| 27 | 57 | 41 | 2 |
| 28 | 59 | 40 | 1 |
| 29 | 60 | 39 | 1 |
| 30 | 61 | 38 | 1 |
Wind in September
Winds average 7 mph in September, the calmest month.
Across September, daily wind ranges from about 7 mph on the calmest days to 7 mph at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 7 | calm |
| 2 | 7 | calm |
| 3 | 7 | calm |
| 4 | 7 | calm |
| 5 | 7 | calm |
| 6 | 7 | calm |
| 7 | 7 | calm |
| 8 | 7 | calm |
| 9 | 7 | calm |
| 10 | 7 | calm |
| 11 | 7 | calm |
| 12 | 7 | calm |
| 13 | 7 | calm |
| 14 | 7 | calm |
| 15 | 7 | calm |
| 16 | 7 | calm |
| 17 | 7 | calm |
| 18 | 7 | calm |
| 19 | 7 | calm |
| 20 | 7 | calm |
| 21 | 7 | calm |
| 22 | 7 | calm |
| 23 | 7 | calm |
| 24 | 7 | calm |
| 25 | 7 | calm |
| 26 | 7 | calm |
| 27 | 7 | calm |
| 28 | 7 | calm |
| 29 | 7 | calm |
| 30 | 7 | calm |
Sunrise & sunset in September
Daylight runs from about 12 h 48 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 66 minutes over September. Sunrise moves from 5:44 AM to 6:09 AM, and sunset from 6:35 PM to 5:49 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.8 | 12.8 | 12.8 | 12.7 | 12.7 | 12.6 | 12.6 | 12.6 | 12.5 | 12.5 | 12.4 | 12.4 | 12.4 | 12.3 | 12.3 | 12.2 | 12.2 | 12.2 | 12.1 | 12.1 | 12.0 | 12.0 | 11.9 | 11.9 | 11.9 | 11.8 | 11.8 | 11.7 | 11.7 | 11.7 |
| Sunrise (AM) | 5:44 | 5:45 | 5:46 | 5:46 | 5:47 | 5:48 | 5:49 | 5:50 | 5:51 | 5:52 | 5:52 | 5:53 | 5:54 | 5:55 | 5:56 | 5:57 | 5:58 | 5:58 | 5:59 | 6:00 | 6:01 | 6:02 | 6:03 | 6:04 | 6:05 | 6:06 | 6:06 | 6:07 | 6:08 | 6:09 |
| Sunset (PM) | 6:35 | 6:33 | 6:32 | 6:30 | 6:29 | 6:27 | 6:25 | 6:24 | 6:22 | 6:21 | 6:19 | 6:17 | 6:16 | 6:14 | 6:13 | 6:11 | 6:09 | 6:08 | 6:06 | 6:05 | 6:03 | 6:01 | 6:00 | 5:58 | 5:57 | 5:55 | 5:53 | 5:52 | 5:50 | 5:49 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.8 | 5:44 | 6:35 |
| 2 | 12.8 | 5:45 | 6:33 |
| 3 | 12.8 | 5:46 | 6:32 |
| 4 | 12.7 | 5:46 | 6:30 |
| 5 | 12.7 | 5:47 | 6:29 |
| 6 | 12.6 | 5:48 | 6:27 |
| 7 | 12.6 | 5:49 | 6:25 |
| 8 | 12.6 | 5:50 | 6:24 |
| 9 | 12.5 | 5:51 | 6:22 |
| 10 | 12.5 | 5:52 | 6:21 |
| 11 | 12.4 | 5:52 | 6:19 |
| 12 | 12.4 | 5:53 | 6:17 |
| 13 | 12.4 | 5:54 | 6:16 |
| 14 | 12.3 | 5:55 | 6:14 |
| 15 | 12.3 | 5:56 | 6:13 |
| 16 | 12.2 | 5:57 | 6:11 |
| 17 | 12.2 | 5:58 | 6:09 |
| 18 | 12.2 | 5:58 | 6:08 |
| 19 | 12.1 | 5:59 | 6:06 |
| 20 | 12.1 | 6:00 | 6:05 |
| 21 | 12.0 | 6:01 | 6:03 |
| 22 | 12.0 | 6:02 | 6:01 |
| 23 | 11.9 | 6:03 | 6:00 |
| 24 | 11.9 | 6:04 | 5:58 |
| 25 | 11.9 | 6:05 | 5:57 |
| 26 | 11.8 | 6:06 | 5:55 |
| 27 | 11.8 | 6:06 | 5:53 |
| 28 | 11.7 | 6:07 | 5:52 |
| 29 | 11.7 | 6:08 | 5:50 |
| 30 | 11.7 | 6:09 | 5:49 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 5.64 kWh/m².
For context, solar energy here swings from a low near 2.25 kWh/m² to a high of 7.64 kWh/m² in June across the year — September's 5.64 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 6.2 | 6.2 | 6.1 | 6.1 | 6.1 | 6.0 | 6.0 | 5.9 | 5.9 | 5.8 | 5.8 | 5.8 | 5.7 | 5.7 | 5.6 | 5.6 | 5.6 | 5.5 | 5.5 | 5.4 | 5.4 | 5.4 | 5.3 | 5.3 | 5.2 | 5.2 | 5.1 | 5.1 | 5.0 | 5.0 |
| Level | Intense | Intense | Intense | Intense | Intense | Intense | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 6.2 | Intense |
| 2 | 6.2 | Intense |
| 3 | 6.1 | Intense |
| 4 | 6.1 | Intense |
| 5 | 6.1 | Intense |
| 6 | 6.0 | Intense |
| 7 | 6.0 | Bright |
| 8 | 5.9 | Bright |
| 9 | 5.9 | Bright |
| 10 | 5.8 | Bright |
| 11 | 5.8 | Bright |
| 12 | 5.8 | Bright |
| 13 | 5.7 | Bright |
| 14 | 5.7 | Bright |
| 15 | 5.6 | Bright |
| 16 | 5.6 | Bright |
| 17 | 5.6 | Bright |
| 18 | 5.5 | Bright |
| 19 | 5.5 | Bright |
| 20 | 5.4 | Bright |
| 21 | 5.4 | Bright |
| 22 | 5.4 | Bright |
| 23 | 5.3 | Bright |
| 24 | 5.3 | Bright |
| 25 | 5.2 | Bright |
| 26 | 5.2 | Bright |
| 27 | 5.1 | Bright |
| 28 | 5.1 | Bright |
| 29 | 5.0 | Bright |
| 30 | 5.0 | Bright |
Hazard calendar for Millbrae
None of Millbrae's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Millbrae's rainy season runs November–March, when most of the year's rain falls.
Is September a good time to visit Millbrae?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is one of the better times to visit Millbrae for general sightseeing.
What to pack for Millbrae in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Millbrae sees daytime highs around 65°F and nights near 57°F. Worth packing: sun protection.
Sea temperature near Millbrae in September
The nearest coast averages about 58°F in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 13 mi away) is warmest in September at about 58°F and coldest in April near 53°F.
The water stays below 68°F all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 53 | 54 | 54 | 53 | 53 | 54 | 56 | 58 | 58 | 57 | 56 | 54 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 53 | Bracing |
| Feb | 54 | Bracing |
| Mar | 54 | Bracing |
| Apr | 53 | Bracing |
| May | 53 | Bracing |
| Jun | 54 | Bracing |
| Jul | 56 | Bracing |
| Aug | 58 | Bracing |
| Sep | 58 | Bracing |
| Oct | 57 | Bracing |
| Nov | 56 | Bracing |
| Dec | 54 | Bracing |
UV index in Millbrae in September
Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Millbrae peaks around June 23 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 2 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 4 | 5 | 6 | 8 | 10 | 10 | 10 | 6 | 5 | 2 | 2 |
| Level | Moderate | Moderate | Moderate | High | Very high | Extreme | Extreme | Very high | High | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Moderate |
| Feb | 4 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 10 | Extreme |
| Jul | 10 | Extreme |
| Aug | 10 | Very high |
| Sep | 6 | High |
| Oct | 5 | High |
| Nov | 2 | Moderate |
| Dec | 2 | Moderate |
Air quality in Millbrae in September
Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.
Air quality in Millbrae is worst in August — around 25 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (June, 10 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 15 | 18 | 16 | 12 | 10 | 10 | 11 | 25 | 17 | 20 | 18 | 13 |
| Level | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 15 | Moderate |
| Feb | 18 | Moderate |
| Mar | 16 | Moderate |
| Apr | 12 | Moderate |
| May | 10 | Good |
| Jun | 10 | Good |
| Jul | 11 | Good |
| Aug | 25 | Moderate |
| Sep | 17 | Moderate |
| Oct | 20 | Moderate |
| Nov | 18 | Moderate |
| Dec | 13 | Moderate |
Where is Millbrae?
Millbrae sits at 37.6°N, 122.4°W, 33 ft above sea level, in United States. The nearest listed city is Burlingame, 1.2 mi away.
Topography around Millbrae
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Millbrae.
Within 2 miles, the terrain around Millbrae has only modest variations in elevation — a maximum elevation change of 663 ft around an average of 141 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,005 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,452 ft.
The land around Millbrae is covered by artificial surfaces (56%) and trees (22%) within 2 miles, water (44%), trees (27%) and artificial surfaces (21%) within 10 miles, and water (42%), trees (22%) and grassland (21%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Millbrae (37.5986°, -122.3872°, elevation 33 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).