Napa vs Union City, California Climate
91%matchNapa vs Union City: a 91% climate match. Compared with Napa, Union City has half the winter rain and 5°F (3°C) cooler summer days.
Napa gets 26 in (669 mm) of rain a year and Union City 16 in (394 mm). August is the warmest month in both, with highs of 87°F (31°C) in Napa and 82°F (28°C) in Union City.
Climate fingerprints: ring color = average temperature, thickness = rain. January at the top.
Month by month
Highs and lows (°F)
NapaUnion Citysolid = high, dashed = low
Rain (in per month)
NapaUnion City
Monthly averages
| Month | High | Low | Rain | |||
|---|---|---|---|---|---|---|
| Napa | Union City | Napa | Union City | Napa | Union City | |
| Jan | 58°F(14°C) | 60°F(15°C) | 39°F(4°C) | 42°F(6°C) | 5.4 in(136 mm) | 3.1 in(78 mm) |
| Feb | 63°F(17°C) | 63°F(17°C) | 41°F(5°C) | 44°F(7°C) | 5.3 in(134 mm) | 2.8 in(72 mm) |
| Mar | 67°F(19°C) | 66°F(19°C) | 43°F(6°C) | 46°F(8°C) | 3.6 in(92 mm) | 2.3 in(58 mm) |
| Apr | 72°F(22°C) | 70°F(21°C) | 45°F(7°C) | 48°F(9°C) | 1.6 in(40 mm) | 1.2 in(30 mm) |
| May | 78°F(25°C) | 74°F(23°C) | 49°F(10°C) | 51°F(11°C) | 1.0 in(25 mm) | 0.4 in(11 mm) |
| Jun | 84°F(29°C) | 79°F(26°C) | 53°F(12°C) | 55°F(13°C) | 0.2 in(6 mm) | 0.1 in(3 mm) |
| Jul | 87°F(30°C) | 81°F(27°C) | 54°F(12°C) | 57°F(14°C) | 0.0 in(0 mm) | 0.0 in(1 mm) |
| Aug | 87°F(31°C) | 82°F(28°C) | 54°F(12°C) | 57°F(14°C) | 0.0 in(1 mm) | 0.0 in(1 mm) |
| Sep | 86°F(30°C) | 82°F(28°C) | 52°F(11°C) | 56°F(13°C) | 0.1 in(3 mm) | 0.1 in(2 mm) |
| Oct | 79°F(26°C) | 77°F(25°C) | 48°F(9°C) | 52°F(11°C) | 1.3 in(33 mm) | 0.9 in(24 mm) |
| Nov | 67°F(19°C) | 67°F(20°C) | 42°F(6°C) | 46°F(8°C) | 2.7 in(69 mm) | 1.7 in(43 mm) |
| Dec | 58°F(15°C) | 60°F(16°C) | 38°F(4°C) | 42°F(5°C) | 5.1 in(130 mm) | 2.8 in(71 mm) |
1991–2020 averages, by calendar month.